/*
 * Copyright (c) 2015 - 2016, Freescale Semiconductor, Inc.
 * Copyright 2016-2017 NXP
 * All rights reserved.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

#include "fsl_enet.h"
#if defined(FSL_SDK_ENABLE_DRIVER_CACHE_CONTROL) && FSL_SDK_ENABLE_DRIVER_CACHE_CONTROL
#include "fsl_cache.h"
#endif /* FSL_SDK_ENABLE_DRIVER_CACHE_CONTROL */

/*******************************************************************************
 * Definitions
 ******************************************************************************/

/* Component ID definition, used by tools. */
#ifndef FSL_COMPONENT_ID
#define FSL_COMPONENT_ID "platform.drivers.enet"
#endif

/*! @brief IPv4 PTP message IP version offset. */
#define ENET_PTP1588_IPVERSION_OFFSET 0x0EU
/*! @brief IPv4 PTP message UDP protocol offset. */
#define ENET_PTP1588_IPV4_UDP_PROTOCOL_OFFSET 0x17U
/*! @brief IPv4 PTP message UDP port offset. */
#define ENET_PTP1588_IPV4_UDP_PORT_OFFSET 0x24U
/*! @brief IPv4 PTP message UDP message type offset. */
#define ENET_PTP1588_IPV4_UDP_MSGTYPE_OFFSET 0x2AU
/*! @brief IPv4 PTP message UDP version offset. */
#define ENET_PTP1588_IPV4_UDP_VERSION_OFFSET 0x2BU
/*! @brief IPv4 PTP message UDP clock id offset. */
#define ENET_PTP1588_IPV4_UDP_CLKID_OFFSET 0x3EU
/*! @brief IPv4 PTP message UDP sequence id offset. */
#define ENET_PTP1588_IPV4_UDP_SEQUENCEID_OFFSET 0x48U
/*! @brief IPv4 PTP message UDP control offset. */
#define ENET_PTP1588_IPV4_UDP_CTL_OFFSET 0x4AU
/*! @brief IPv6 PTP message UDP protocol offset. */
#define ENET_PTP1588_IPV6_UDP_PROTOCOL_OFFSET 0x14U
/*! @brief IPv6 PTP message UDP port offset. */
#define ENET_PTP1588_IPV6_UDP_PORT_OFFSET 0x38U
/*! @brief IPv6 PTP message UDP message type offset. */
#define ENET_PTP1588_IPV6_UDP_MSGTYPE_OFFSET 0x3EU
/*! @brief IPv6 PTP message UDP version offset. */
#define ENET_PTP1588_IPV6_UDP_VERSION_OFFSET 0x3FU
/*! @brief IPv6 PTP message UDP clock id offset. */
#define ENET_PTP1588_IPV6_UDP_CLKID_OFFSET 0x52U
/*! @brief IPv6 PTP message UDP sequence id offset. */
#define ENET_PTP1588_IPV6_UDP_SEQUENCEID_OFFSET 0x5CU
/*! @brief IPv6 PTP message UDP control offset. */
#define ENET_PTP1588_IPV6_UDP_CTL_OFFSET 0x5EU
/*! @brief PTPv2 message Ethernet packet type offset. */
#define ENET_PTP1588_ETHL2_PACKETTYPE_OFFSET 0x0CU
/*! @brief PTPv2 message Ethernet message type offset. */
#define ENET_PTP1588_ETHL2_MSGTYPE_OFFSET 0x0EU
/*! @brief PTPv2 message Ethernet version type offset. */
#define ENET_PTP1588_ETHL2_VERSION_OFFSET 0X0FU
/*! @brief PTPv2 message Ethernet clock id offset. */
#define ENET_PTP1588_ETHL2_CLOCKID_OFFSET 0x22
/*! @brief PTPv2 message Ethernet sequence id offset. */
#define ENET_PTP1588_ETHL2_SEQUENCEID_OFFSET 0x2c
/*! @brief Packet type Ethernet IEEE802.3 for PTPv2. */
#define ENET_ETHERNETL2 0x88F7U
/*! @brief Packet type IPv4. */
#define ENET_IPV4 0x0800U
/*! @brief Packet type IPv6. */
#define ENET_IPV6 0x86ddU
/*! @brief Packet type VLAN. */
#define ENET_8021QVLAN 0x8100U
/*! @brief UDP protocol type. */
#define ENET_UDPVERSION 0x0011U
/*! @brief Packet IP version IPv4. */
#define ENET_IPV4VERSION 0x0004U
/*! @brief Packet IP version IPv6. */
#define ENET_IPV6VERSION 0x0006U
/*! @brief Ethernet mac address length. */
#define ENET_FRAME_MACLEN 6U
/*! @brief Ethernet VLAN header length. */
#define ENET_FRAME_VLAN_TAGLEN 4U
/*! @brief MDC frequency. */
#define ENET_MDC_FREQUENCY 2500000U
/*! @brief NanoSecond in one second. */
#define ENET_NANOSECOND_ONE_SECOND 1000000000U
/*! @brief Define a common clock cycle delays used for time stamp capture. */
#ifndef ENET_1588TIME_DELAY_COUNT
#define ENET_1588TIME_DELAY_COUNT 10U
#endif

/*! @brief Defines the macro for converting constants from host byte order to network byte order. */
#define ENET_HTONS(n) __REV16(n)
#define ENET_HTONL(n) __REV(n)
#define ENET_NTOHS(n) __REV16(n)
#define ENET_NTOHL(n) __REV(n)

/*! @brief Define the ENET ring/class bumber . */
enum _enet_ring_number
{
    kENET_Ring0 = 0U, /*!< ENET ring/class 0. */
#if FSL_FEATURE_ENET_QUEUE > 1
    kENET_Ring1 = 1U, /*!< ENET ring/class 1. */
    kENET_Ring2 = 2U  /*!< ENET ring/class 2. */
#endif                /* FSL_FEATURE_ENET_QUEUE > 1 */
};

/*! @brief Define interrupt IRQ handler. */
#if FSL_FEATURE_ENET_QUEUE > 1
typedef void (*enet_isr_ring_t)(ENET_Type *base, enet_handle_t *handle, uint32_t ringId);
#endif /* FSL_FEATURE_ENET_QUEUE > 1 */
typedef void (*enet_isr_t)(ENET_Type *base, enet_handle_t *handle);

/*******************************************************************************
* Prototypes
******************************************************************************/

/*!
 * @brief Get the ENET instance from peripheral base address.
 *
 * @param base ENET peripheral base address.
 * @return ENET instance.
 */
uint32_t ENET_GetInstance(ENET_Type *base);
/*!
 * @brief Set ENET MAC controller with the configuration.
 *
 * @param base ENET peripheral base address.
 * @param handle The ENET handle pointer.
 * @param config ENET Mac configuration.
 * @param bufferConfig ENET buffer configuration.
 * @param macAddr ENET six-byte mac address.
 * @param srcClock_Hz ENET module clock source, normally it's system clock.
 */
static void ENET_SetMacController(ENET_Type *base,
                                  enet_handle_t *handle,
                                  const enet_config_t *config,
                                  const enet_buffer_config_t *bufferConfig,
                                  uint8_t *macAddr,
                                  uint32_t srcClock_Hz);
/*!
 * @brief Set ENET handler.
 *
 * @param base ENET peripheral base address.
 * @param handle The ENET handle pointer.
 * @param config ENET configuration stucture pointer.
 * @param bufferConfig ENET buffer configuration.
 */
static void ENET_SetHandler(ENET_Type *base,
                            enet_handle_t *handle,
                            const enet_config_t *config,
                            const enet_buffer_config_t *bufferConfig);
/*!
 * @brief Set ENET MAC transmit buffer descriptors.
 *
 * @param handle The ENET handle pointer.
 * @param config The ENET configuration structure.
 * @param bufferConfig The ENET buffer configuration.
 */
static void ENET_SetTxBufferDescriptors(enet_handle_t *handle,
                                        const enet_config_t *config,
                                        const enet_buffer_config_t *bufferConfig);

/*!
 * @brief Set ENET MAC receive buffer descriptors.
 *
 * @param handle The ENET handle pointer.
 * @param config The ENET configuration structure.
 * @param bufferConfig The ENET buffer configuration.
 */
static void ENET_SetRxBufferDescriptors(enet_handle_t *handle,
                                        const enet_config_t *config,
                                        const enet_buffer_config_t *bufferConfig);

/*!
 * @brief Updates the ENET read buffer descriptors.
 *
 * @param base ENET peripheral base address.
 * @param handle The ENET handle pointer.
 * @param ringId The descriptor ring index, range from 0 ~ FSL_FEATURE_ENET_QUEUE - 1.
 *               0 ----- for single ring kinetis platform.
 *               0 ~ 2 for mulit-ring supported IMX8qm.
 */
static void ENET_UpdateReadBuffers(ENET_Type *base, enet_handle_t *handle, uint32_t ringId);

/*!
 * @brief Activates ENET send for multiple tx rings.
 *
 * @param base  ENET peripheral base address.
 * @param ringId The descriptor ring index, range from 0 ~ FSL_FEATURE_ENET_QUEUE - 1.
 *               0 ----- for single ring kinetis platform.
 *               0 ~ 2 for mulit-ring supported IMX8qm.
 *
 * @note This must be called after the MAC configuration and
 * state are ready. It must be called after the ENET_Init() and
 * this should be called when the ENET receive required.
 */
static void ENET_ActiveSend(ENET_Type *base, uint32_t ringId);
#ifdef ENET_ENHANCEDBUFFERDESCRIPTOR_MODE
/*!
 * @brief Parses the ENET frame for time-stamp process of PTP 1588 frame.
 *
 * @param data  The ENET read data for frame parse.
 * @param ptpTsData The ENET PTP message and time-stamp data pointer.
 * @param isFastEnabled The fast parse flag.
 *        - true , Fast processing, only check if this is a PTP message.
 *        - false, Store the PTP message data after check the PTP message.
 */
static bool ENET_Ptp1588ParseFrame(const uint8_t *data, enet_ptp_time_data_t *ptpTsData, bool isFastEnabled);

/*!
 * @brief Updates the new PTP 1588 time-stamp to the time-stamp buffer ring.
 *
 * @param ptpTsDataRing The PTP message and time-stamp data ring pointer.
 * @param ptpTimeData   The new PTP 1588 time-stamp data pointer.
 */
static status_t ENET_Ptp1588UpdateTimeRing(enet_ptp_time_data_ring_t *ptpTsDataRing, enet_ptp_time_data_t *ptpTimeData);

/*!
 * @brief Search up the right PTP 1588 time-stamp from the time-stamp buffer ring.
 *
 * @param ptpTsDataRing The PTP message and time-stamp data ring pointer.
 * @param ptpTimeData   The find out right PTP 1588 time-stamp data pointer with the specific PTP message.
 */
static status_t ENET_Ptp1588SearchTimeRing(enet_ptp_time_data_ring_t *ptpTsDataRing, enet_ptp_time_data_t *ptpTimedata);

/*!
 * @brief Store the transmit time-stamp for event PTP frame in the time-stamp buffer ring.
 *
 * @param base   ENET peripheral base address.
 * @param handle The ENET handle pointer.
 * @param ringId The descriptor ring index, range from 0 ~ FSL_FEATURE_ENET_QUEUE - 1.
 *               0 ----- for single ring kinetis platform.
 *               0 ~ 2 for mulit-ring supported IMX8qm.
 */
static status_t ENET_StoreTxFrameTime(ENET_Type *base, enet_handle_t *handle, uint32_t ringId);

/*!
 * @brief Store the receive time-stamp for event PTP frame in the time-stamp buffer ring.
 *
 * @param base   ENET peripheral base address.
 * @param handle The ENET handle pointer.
 * @param ptpTimeData The PTP 1588 time-stamp data pointer.
 */
static status_t ENET_StoreRxFrameTime(ENET_Type *base, enet_handle_t *handle, enet_ptp_time_data_t *ptpTimeData);

#if defined(FSL_FEATURE_ENET_HAS_AVB) && FSL_FEATURE_ENET_AVB
/*!
 * @brief Gets the ring index for transmission.
 *
 * @param base  ENET peripheral base address.
 * @param data The ENET transmit data.
 * @param handle The ENET handle pointer.
 *
 * @note This must be called after the MAC configuration and
 * state are ready. It must be called after the ENET_Init() and
 * this should be called when the ENET receive required.
 */
static uint8_t ENET_GetTxRingId(ENET_Type *base, uint8_t *data, enet_handle_t *handle);
#endif /* FSL_FEATURE_ENET_HAS_AVB */
#endif /* ENET_ENHANCEDBUFFERDESCRIPTOR_MODE */

/*******************************************************************************
 * Variables
 ******************************************************************************/

/*! @brief Pointers to enet handles for each instance. */
static enet_handle_t *s_ENETHandle[FSL_FEATURE_SOC_ENET_COUNT] = {NULL};

/*! @brief Pointers to enet clocks for each instance. */
#if !(defined(FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL) && FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL)
const clock_ip_name_t s_enetClock[] = ENET_CLOCKS;
#endif /* FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL */

/*! @brief Pointers to enet transmit IRQ number for each instance. */
static const IRQn_Type s_enetTxIrqId[] = ENET_Transmit_IRQS;
/*! @brief Pointers to enet receive IRQ number for each instance. */
static const IRQn_Type s_enetRxIrqId[] = ENET_Receive_IRQS;
#if defined(ENET_ENHANCEDBUFFERDESCRIPTOR_MODE) && ENET_ENHANCEDBUFFERDESCRIPTOR_MODE
/*! @brief Pointers to enet timestamp IRQ number for each instance. */
static const IRQn_Type s_enetTsIrqId[] = ENET_1588_Timer_IRQS;
#endif /* ENET_ENHANCEDBUFFERDESCRIPTOR_MODE */
/*! @brief Pointers to enet error IRQ number for each instance. */
static const IRQn_Type s_enetErrIrqId[] = ENET_Error_IRQS;

/*! @brief Pointers to enet bases for each instance. */
static ENET_Type *const s_enetBases[] = ENET_BASE_PTRS;

/* ENET ISR for transactional APIs. */
#if FSL_FEATURE_ENET_QUEUE > 1
static enet_isr_ring_t s_enetTxIsr;
static enet_isr_ring_t s_enetRxIsr;
#else
static enet_isr_t s_enetTxIsr;
static enet_isr_t s_enetRxIsr;
#endif /* FSL_FEATURE_ENET_QUEUE > 1 */
static enet_isr_t s_enetErrIsr;
static enet_isr_t s_enetTsIsr;
/*******************************************************************************
 * Code
 ******************************************************************************/

uint32_t ENET_GetInstance(ENET_Type *base)
{
    uint32_t instance;

    /* Find the instance index from base address mappings. */
    for (instance = 0; instance < ARRAY_SIZE(s_enetBases); instance++)
    {
        if (s_enetBases[instance] == base)
        {
            break;
        }
    }

    assert(instance < ARRAY_SIZE(s_enetBases));

    return instance;
}

/*!
 * brief Gets the ENET default configuration structure.
 *
 * The purpose of this API is to get the default ENET MAC controller
 * configure structure for ENET_Init(). User may use the initialized
 * structure unchanged in ENET_Init(), or modify some fields of the
 * structure before calling ENET_Init().
 * Example:
   code
   enet_config_t config;
   ENET_GetDefaultConfig(&config);
   endcode
 * param config The ENET mac controller configuration structure pointer.
 */
void ENET_GetDefaultConfig(enet_config_t *config)
{
    /* Checks input parameter. */
    assert(config);

    /* Initializes the MAC configure structure to zero. */
    memset(config, 0, sizeof(enet_config_t));

/* Sets MII mode, full duplex, 100Mbps for MAC and PHY data interface. */
#if defined(FSL_FEATURE_ENET_HAS_AVB) && FSL_FEATURE_ENET_HAS_AVB
    config->miiMode = kENET_RgmiiMode;
#else
    config->miiMode = kENET_RmiiMode;
#endif
    config->miiSpeed = kENET_MiiSpeed100M;
    config->miiDuplex = kENET_MiiFullDuplex;

    config->ringNum = 1;

    /* Sets the maximum receive frame length. */
    config->rxMaxFrameLen = ENET_FRAME_MAX_FRAMELEN;
}

/*!
 * brief Initializes the ENET module.
 *
 * This function ungates the module clock and initializes it with the ENET configuration.
 *
 * param base    ENET peripheral base address.
 * param handle  ENET handler pointer.
 * param config  ENET mac configuration structure pointer.
 *        The "enet_config_t" type mac configuration return from ENET_GetDefaultConfig
 *        can be used directly. It is also possible to verify the Mac configuration using other methods.
 * param bufferConfig  ENET buffer configuration structure pointer.
 *        The buffer configuration should be prepared for ENET Initialization.
 *        It is the start address of "ringNum" enet_buffer_config structures.
 *        To support added multi-ring features in some soc and compatible with the previous
 *        enet driver version. For single ring supported, this bufferConfig is a buffer
 *        configure structure pointer, for multi-ring supported and used case, this bufferConfig
 *        pointer should be a buffer configure structure array pointer.
 * param macAddr  ENET mac address of Ethernet device. This MAC address should be
 *        provided.
 * param srcClock_Hz The internal module clock source for MII clock.
 *
 * note ENET has two buffer descriptors legacy buffer descriptors and
 * enhanced IEEE 1588 buffer descriptors. The legacy descriptor is used by default. To
 * use the IEEE 1588 feature, use the enhanced IEEE 1588 buffer descriptor
 * by defining "ENET_ENHANCEDBUFFERDESCRIPTOR_MODE" and calling ENET_Ptp1588Configure()
 * to configure the 1588 feature and related buffers after calling ENET_Init().
 */
void ENET_Init(ENET_Type *base,
               enet_handle_t *handle,
               const enet_config_t *config,
               const enet_buffer_config_t *bufferConfig,
               uint8_t *macAddr,
               uint32_t srcClock_Hz)
{
    /* Checks input parameters. */
    assert(handle);
    assert(config);
    assert(bufferConfig);
    assert(macAddr);
    assert(config->ringNum <= FSL_FEATURE_ENET_QUEUE);

#if !(defined(FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL) && FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL)
    uint32_t instance = ENET_GetInstance(base);

    /* Ungate ENET clock. */
    CLOCK_EnableClock(s_enetClock[instance]);
#endif /* FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL */
    /* Reset ENET module. */
    ENET_Reset(base);

    /* Initializes the ENET transmit buffer descriptors. */
    ENET_SetTxBufferDescriptors(handle, config, bufferConfig);

    /* Initializes the ENET receive buffer descriptors. */
    ENET_SetRxBufferDescriptors(handle, config, bufferConfig);

    /* Initializes the ENET MAC controller with basic function. */
    ENET_SetMacController(base, handle, config, bufferConfig, macAddr, srcClock_Hz);

    /* Set all buffers or data in handler for data transmit/receive process. */
    ENET_SetHandler(base, handle, config, bufferConfig);
}

/*!
 * brief Deinitializes the ENET module.

 * This function gates the module clock, clears ENET interrupts, and disables the ENET module.
 *
 * param base  ENET peripheral base address.
 */
void ENET_Deinit(ENET_Type *base)
{
    /* Disable interrupt. */
    base->EIMR = 0;

    /* Disable ENET. */
    base->ECR &= ~ENET_ECR_ETHEREN_MASK;

#if !(defined(FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL) && FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL)
    /* Disables the clock source. */
    CLOCK_DisableClock(s_enetClock[ENET_GetInstance(base)]);
#endif /* FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL */
}

/*!
 * brief Sets the callback function.
 * This API is provided for the application callback required case when ENET
 * interrupt is enabled. This API should be called after calling ENET_Init.
 *
 * param handle ENET handler pointer. Should be provided by application.
 * param callback The ENET callback function.
 * param userData The callback function parameter.
 */
void ENET_SetCallback(enet_handle_t *handle, enet_callback_t callback, void *userData)
{
    assert(handle);

    /* Set callback and userData. */
    handle->callback = callback;
    handle->userData = userData;
}

static void ENET_SetHandler(ENET_Type *base,
                            enet_handle_t *handle,
                            const enet_config_t *config,
                            const enet_buffer_config_t *bufferConfig)
{
    uint8_t count;
    uint32_t instance = ENET_GetInstance(base);
    const enet_buffer_config_t *buffCfg = bufferConfig;

    /* Store transfer parameters in handle pointer. */
    memset(handle, 0, sizeof(enet_handle_t));

    handle->ringNum = (config->ringNum > FSL_FEATURE_ENET_QUEUE) ? FSL_FEATURE_ENET_QUEUE : config->ringNum;
    for (count = 0; count < handle->ringNum; count++)
    {
        assert(buffCfg->rxBuffSizeAlign * buffCfg->rxBdNumber > config->rxMaxFrameLen);

        handle->rxBdBase[count] = buffCfg->rxBdStartAddrAlign;
        handle->rxBdCurrent[count] = buffCfg->rxBdStartAddrAlign;
        handle->rxBuffSizeAlign[count] = buffCfg->rxBuffSizeAlign;
        handle->txBdBase[count] = buffCfg->txBdStartAddrAlign;
        handle->txBdCurrent[count] = buffCfg->txBdStartAddrAlign;
        handle->txBuffSizeAlign[count] = buffCfg->txBuffSizeAlign;
        buffCfg++;
    }

    /* Save the handle pointer in the global variables. */
    s_ENETHandle[instance] = handle;

    /* Set the IRQ handler when the interrupt is enabled. */
    if (config->interrupt & ENET_TX_INTERRUPT)
    {
        s_enetTxIsr = ENET_TransmitIRQHandler;
        EnableIRQ(s_enetTxIrqId[instance]);
    }
    if (config->interrupt & ENET_RX_INTERRUPT)
    {
        s_enetRxIsr = ENET_ReceiveIRQHandler;
        EnableIRQ(s_enetRxIrqId[instance]);
    }
    if (config->interrupt & ENET_ERR_INTERRUPT)
    {
        s_enetErrIsr = ENET_ErrorIRQHandler;
        EnableIRQ(s_enetErrIrqId[instance]);
    }
}

static void ENET_SetMacController(ENET_Type *base,
                                  enet_handle_t *handle,
                                  const enet_config_t *config,
                                  const enet_buffer_config_t *bufferConfig,
                                  uint8_t *macAddr,
                                  uint32_t srcClock_Hz)
{
#if defined(FSL_FEATURE_ENET_HAS_AVB) && FSL_FEATURE_ENET_HAS_AVB
    /* Check the MII mode/speed/duplex setting. */
    if (config->miiSpeed == kENET_MiiSpeed1000M)
    {
        /* Only RGMII mode has the 1000M bit/s. The 1000M only support full duplex. */
        assert(config->miiMode == kENET_RgmiiMode);
        assert(config->miiDuplex == kENET_MiiFullDuplex);
    }
#endif /* FSL_FEATURE_ENET_HAS_AVB */

    uint32_t rcr = 0;
    uint32_t tcr = 0;
    uint32_t ecr = base->ECR;
    uint32_t macSpecialConfig = config->macSpecialConfig;
    uint32_t maxFrameLen = config->rxMaxFrameLen;

    /* Maximum frame length check. */
    if ((macSpecialConfig & kENET_ControlVLANTagEnable) && (maxFrameLen <= ENET_FRAME_MAX_FRAMELEN))
    {
        maxFrameLen = (ENET_FRAME_MAX_FRAMELEN + ENET_FRAME_VLAN_TAGLEN);
#if defined(FSL_FEATURE_ENET_HAS_AVB) && FSL_FEATURE_ENET_HAS_AVB
        if (macSpecialConfig & kENET_ControlSVLANEnable)
        {
            /* Double vlan tag (SVLAN) supported. */
            maxFrameLen += ENET_FRAME_VLAN_TAGLEN;
        }
        ecr |= ((macSpecialConfig & kENET_ControlSVLANEnable) ? (ENET_ECR_SVLANEN_MASK | ENET_ECR_SVLANDBL_MASK) : 0) |
               ((macSpecialConfig & kENET_ControlVLANUseSecondTag) ? ENET_ECR_VLANUSE2ND_MASK : 0);
#endif /* FSL_FEATURE_ENET_HAS_AVB */
    }

    /* Configures MAC receive controller with user configure structure. */
    rcr = ((macSpecialConfig & kENET_ControlRxPayloadCheckEnable) ? ENET_RCR_NLC_MASK : 0) |
          ((macSpecialConfig & kENET_ControlFlowControlEnable) ? ENET_RCR_CFEN_MASK : 0) |
          ((macSpecialConfig & kENET_ControlFlowControlEnable) ? ENET_RCR_FCE_MASK : 0) |
          ((macSpecialConfig & kENET_ControlRxPadRemoveEnable) ? ENET_RCR_PADEN_MASK : 0) |
          ((macSpecialConfig & kENET_ControlRxBroadCastRejectEnable) ? ENET_RCR_BC_REJ_MASK : 0) |
          ((macSpecialConfig & kENET_ControlPromiscuousEnable) ? ENET_RCR_PROM_MASK : 0) |
          ENET_RCR_MAX_FL(maxFrameLen) | ENET_RCR_CRCFWD_MASK;

/* Set the RGMII or RMII, MII mode and control register. */
#if defined(FSL_FEATURE_ENET_HAS_AVB) && FSL_FEATURE_ENET_HAS_AVB
    if (config->miiMode == kENET_RgmiiMode)
    {
        rcr |= ENET_RCR_RGMII_EN_MASK;
        rcr &= ~ENET_RCR_MII_MODE_MASK;
    }
    else
    {
        rcr &= ~ENET_RCR_RGMII_EN_MASK;
#endif /* FSL_FEATURE_ENET_HAS_AVB */
        rcr |= ENET_RCR_MII_MODE_MASK;
        if (config->miiMode == kENET_RmiiMode)
        {
            rcr |= ENET_RCR_RMII_MODE_MASK;
        }
#if defined(FSL_FEATURE_ENET_HAS_AVB) && FSL_FEATURE_ENET_HAS_AVB
    }
#endif /* FSL_FEATURE_ENET_HAS_AVB */
    /* Speed. */
    if (config->miiSpeed == kENET_MiiSpeed10M)
    {
        rcr |= ENET_RCR_RMII_10T_MASK;
    }
#if defined(FSL_FEATURE_ENET_HAS_AVB) && FSL_FEATURE_ENET_HAS_AVB
    if (config->miiSpeed == kENET_MiiSpeed1000M)
    {
        ecr |= ENET_ECR_SPEED_MASK;
    }
#endif /* FSL_FEATURE_ENET_HAS_AVB */

    /* Receive setting for half duplex. */
    if (config->miiDuplex == kENET_MiiHalfDuplex)
    {
        rcr |= ENET_RCR_DRT_MASK;
    }
    /* Sets internal loop only for MII mode. */
    if ((config->macSpecialConfig & kENET_ControlMIILoopEnable) && (config->miiMode != kENET_RmiiMode))
    {
        rcr |= ENET_RCR_LOOP_MASK;
        rcr &= ~ENET_RCR_DRT_MASK;
    }
    base->RCR = rcr;

    /* Configures MAC transmit controller: duplex mode, mac address insertion. */
    tcr = base->TCR & ~(ENET_TCR_FDEN_MASK | ENET_TCR_ADDINS_MASK);
    tcr |= (config->miiDuplex ? ENET_TCR_FDEN_MASK : 0) |
           ((macSpecialConfig & kENET_ControlMacAddrInsert) ? ENET_TCR_ADDINS_MASK : 0);
    base->TCR = tcr;

    /* Configures receive and transmit accelerator. */
    base->TACC = config->txAccelerConfig;
    base->RACC = config->rxAccelerConfig;

    /* Sets the pause duration and FIFO threshold for the flow control enabled case. */
    if (macSpecialConfig & kENET_ControlFlowControlEnable)
    {
        uint32_t reemReg;
        base->OPD = config->pauseDuration;
        reemReg = ENET_RSEM_RX_SECTION_EMPTY(config->rxFifoEmptyThreshold);
#if defined(FSL_FEATURE_ENET_HAS_RECEIVE_STATUS_THRESHOLD) && FSL_FEATURE_ENET_HAS_RECEIVE_STATUS_THRESHOLD
        reemReg |= ENET_RSEM_STAT_SECTION_EMPTY(config->rxFifoStatEmptyThreshold);
#endif /* FSL_FEATURE_ENET_HAS_RECEIVE_STATUS_THRESHOLD */
        base->RSEM = reemReg;
    }

    /* FIFO threshold setting for store and forward enable/disable case. */
    if (macSpecialConfig & kENET_ControlStoreAndFwdDisable)
    {
        /* Transmit fifo watermark settings. */
        base->TFWR = config->txFifoWatermark & ENET_TFWR_TFWR_MASK;
        /* Receive fifo full threshold settings. */
        base->RSFL = config->rxFifoFullThreshold & ENET_RSFL_RX_SECTION_FULL_MASK;
    }
    else
    {
        /* Transmit fifo watermark settings. */
        base->TFWR = ENET_TFWR_STRFWD_MASK;
        base->RSFL = 0;
    }

    /* Enable store and forward when accelerator is enabled */
    if (config->txAccelerConfig & (kENET_TxAccelIpCheckEnabled | kENET_TxAccelProtoCheckEnabled))
    {
        base->TFWR = ENET_TFWR_STRFWD_MASK;
    }
    if (config->rxAccelerConfig & (kENET_RxAccelIpCheckEnabled | kENET_RxAccelProtoCheckEnabled))
    {
        base->RSFL = 0;
    }

/* Initializes the ring 0. */
#if defined(FSL_FEATURE_MEMORY_HAS_ADDRESS_OFFSET) && FSL_FEATURE_MEMORY_HAS_ADDRESS_OFFSET
    base->TDSR = MEMORY_ConvertMemoryMapAddress((uint32_t)bufferConfig->txBdStartAddrAlign, kMEMORY_Local2DMA);
    base->RDSR = MEMORY_ConvertMemoryMapAddress((uint32_t)bufferConfig->rxBdStartAddrAlign, kMEMORY_Local2DMA);
#else
    base->TDSR = (uint32_t)bufferConfig->txBdStartAddrAlign;
    base->RDSR = (uint32_t)bufferConfig->rxBdStartAddrAlign;
#endif
    base->MRBR = bufferConfig->rxBuffSizeAlign;

#if defined(FSL_FEATURE_ENET_HAS_AVB) && FSL_FEATURE_ENET_HAS_AVB
    const enet_buffer_config_t *buffCfg = bufferConfig;

    if (config->ringNum > 1)
    {
        /* Initializes the ring 1. */
        buffCfg++;
#if defined(FSL_FEATURE_MEMORY_HAS_ADDRESS_OFFSET) && FSL_FEATURE_MEMORY_HAS_ADDRESS_OFFSET
        base->TDSR1 = MEMORY_ConvertMemoryMapAddress((uint32_t)buffCfg->txBdStartAddrAlign, kMEMORY_Local2DMA);
        base->RDSR1 = MEMORY_ConvertMemoryMapAddress((uint32_t)buffCfg->rxBdStartAddrAlign, kMEMORY_Local2DMA);
#else
        base->TDSR1 = (uint32_t)buffCfg->txBdStartAddrAlign;
        base->RDSR1 = (uint32_t)buffCfg->rxBdStartAddrAlign;
#endif
        base->MRBR1 = buffCfg->rxBuffSizeAlign;
        /* Enable the DMAC for ring 1 and with no rx classification set. */
        base->DMACFG[0] = ENET_DMACFG_DMA_CLASS_EN_MASK;
    }
    if (config->ringNum > 2)
    {
        /* Initializes the ring 2. */
        buffCfg++;
#if defined(FSL_FEATURE_MEMORY_HAS_ADDRESS_OFFSET) && FSL_FEATURE_MEMORY_HAS_ADDRESS_OFFSET
        base->TDSR2 = MEMORY_ConvertMemoryMapAddress((uint32_t)buffCfg->txBdStartAddrAlign, kMEMORY_Local2DMA);
        base->RDSR2 = MEMORY_ConvertMemoryMapAddress((uint32_t)buffCfg->rxBdStartAddrAlign, kMEMORY_Local2DMA);
#else
        base->TDSR2 = (uint32_t)buffCfg->txBdStartAddrAlign;
        base->RDSR2 = (uint32_t)buffCfg->rxBdStartAddrAlign;
#endif
        base->MRBR2 = buffCfg->rxBuffSizeAlign;
        /* Enable the DMAC for ring 2 and with no rx classification set. */
        base->DMACFG[1] = ENET_DMACFG_DMA_CLASS_EN_MASK;
    }

    /* Default the class/ring 1 and 2 are not enabled and the receive classification is disabled
     * so we set the default transmit scheme with the round-robin mode. beacuse the legacy bd mode
     * only support the round-robin mode. if the avb feature is required, just call the setup avb
     * feature API. */
    base->QOS |= ENET_QOS_TX_SCHEME(1);
#endif /*  FSL_FEATURE_ENET_HAS_AVB */

    /* Configures the Mac address. */
    ENET_SetMacAddr(base, macAddr);

    /* Initialize the SMI if uninitialized. */
    if (!ENET_GetSMI(base))
    {
        ENET_SetSMI(base, srcClock_Hz, !!(config->macSpecialConfig & kENET_ControlSMIPreambleDisable));
    }

/* Enables Ethernet interrupt, enables the interrupt coalsecing if it is required. */
#if defined(FSL_FEATURE_ENET_HAS_INTERRUPT_COALESCE) && FSL_FEATURE_ENET_HAS_INTERRUPT_COALESCE
    if (config->intCoalesceCfg)
    {
        uint32_t intMask = (ENET_EIMR_TXB_MASK | ENET_EIMR_RXB_MASK);

#if FSL_FEATURE_ENET_QUEUE > 1
        uint8_t queue = 0;
        intMask |= ENET_EIMR_TXB2_MASK | ENET_EIMR_RXB2_MASK | ENET_EIMR_TXB1_MASK | ENET_EIMR_RXB1_MASK;
#endif /* FSL_FEATURE_ENET_QUEUE > 1 */

        /* Clear all buffer interrupts. */
        base->EIMR &= ~intMask;

/* Set the interrupt coalescence. */
#if FSL_FEATURE_ENET_QUEUE > 1
        for (queue = 0; queue < FSL_FEATURE_ENET_QUEUE; queue++)
        {
            base->TXIC[queue] = ENET_TXIC_ICFT(config->intCoalesceCfg->txCoalesceFrameCount[queue]) |
                                config->intCoalesceCfg->txCoalesceTimeCount[queue] | ENET_TXIC_ICCS_MASK |
                                ENET_TXIC_ICEN_MASK;
            base->RXIC[queue] = ENET_RXIC_ICFT(config->intCoalesceCfg->rxCoalesceFrameCount[queue]) |
                                config->intCoalesceCfg->rxCoalesceTimeCount[queue] | ENET_RXIC_ICCS_MASK |
                                ENET_RXIC_ICEN_MASK;
        }
#else
        base->TXIC = ENET_TXIC_ICFT(config->intCoalesceCfg->txCoalesceFrameCount[0]) |
                     config->intCoalesceCfg->txCoalesceTimeCount[0] | ENET_TXIC_ICCS_MASK | ENET_TXIC_ICEN_MASK;
        base->RXIC = ENET_RXIC_ICFT(config->intCoalesceCfg->rxCoalesceFrameCount[0]) |
                     config->intCoalesceCfg->rxCoalesceTimeCount[0] | ENET_RXIC_ICCS_MASK | ENET_RXIC_ICEN_MASK;
#endif /* FSL_FEATURE_ENET_QUEUE > 1 */
    }
#endif /* FSL_FEATURE_ENET_HAS_INTERRUPT_COALESCE */
    ENET_EnableInterrupts(base, config->interrupt);

#ifdef ENET_ENHANCEDBUFFERDESCRIPTOR_MODE
    /* Sets the 1588 enhanced feature. */
    ecr |= ENET_ECR_EN1588_MASK;
#endif /* ENET_ENHANCEDBUFFERDESCRIPTOR_MODE */
    /* Enables Ethernet module after all configuration except the buffer descriptor active. */
    ecr |= ENET_ECR_ETHEREN_MASK | ENET_ECR_DBSWP_MASK;
    base->ECR = ecr;
}

static void ENET_SetTxBufferDescriptors(enet_handle_t *handle,
                                        const enet_config_t *config,
                                        const enet_buffer_config_t *bufferConfig)
{
    assert(config);
    assert(bufferConfig);

    /* Default single ring is supported. */
    uint8_t ringNum;
    uint32_t count;
    uint32_t txBuffSizeAlign;
    uint8_t *txBuffer;
    const enet_buffer_config_t *buffCfg = bufferConfig;

    /* Check the input parameters. */
    for (ringNum = 0; ringNum < config->ringNum; ringNum++)
    {
        if ((buffCfg->txBdStartAddrAlign > 0) && (buffCfg->txBufferAlign > 0))
        {
            volatile enet_tx_bd_struct_t *curBuffDescrip = buffCfg->txBdStartAddrAlign;
            txBuffSizeAlign = buffCfg->txBuffSizeAlign;
#if defined(FSL_FEATURE_MEMORY_HAS_ADDRESS_OFFSET) && FSL_FEATURE_MEMORY_HAS_ADDRESS_OFFSET
            txBuffer = (uint8_t *)MEMORY_ConvertMemoryMapAddress((uint32_t)buffCfg->txBufferAlign, kMEMORY_Local2DMA);
#else
            txBuffer = buffCfg->txBufferAlign;
#endif
            for (count = 0; count < buffCfg->txBdNumber; count++)
            {
                /* Set data buffer address. */
                curBuffDescrip->buffer = (uint8_t *)((uint32_t)&txBuffer[count * txBuffSizeAlign]);
                /* Initializes data length. */
                curBuffDescrip->length = 0;
                /* Sets the crc. */
                curBuffDescrip->control = ENET_BUFFDESCRIPTOR_TX_TRANMITCRC_MASK;
                /* Sets the last buffer descriptor with the wrap flag. */
                if (count == buffCfg->txBdNumber - 1)
                {
                    curBuffDescrip->control |= ENET_BUFFDESCRIPTOR_TX_WRAP_MASK;
                }

#ifdef ENET_ENHANCEDBUFFERDESCRIPTOR_MODE
                /* Enable transmit interrupt for store the transmit timestamp. */
                curBuffDescrip->controlExtend1 |= ENET_BUFFDESCRIPTOR_TX_INTERRUPT_MASK;
#if defined(FSL_FEATURE_ENET_HAS_AVB) && FSL_FEATURE_ENET_HAS_AVB
                /* Set the type of the frame when the credit-based scheme is used. */
                curBuffDescrip->controlExtend1 |= ENET_BD_FTYPE(ringNum);
#endif /* FSL_FEATURE_ENET_HAS_AVB */
#endif /* ENET_ENHANCEDBUFFERDESCRIPTOR_MODE */
                /* Increase the index. */
                curBuffDescrip++;
            }
        }
        buffCfg++;
    }
}

static void ENET_SetRxBufferDescriptors(enet_handle_t *handle,
                                        const enet_config_t *config,
                                        const enet_buffer_config_t *bufferConfig)
{
    assert(config);
    assert(bufferConfig);

    /* Default single ring is supported. */
    uint8_t ringNum;
    uint32_t count;
    uint32_t rxBuffSizeAlign;
    uint8_t *rxBuffer;
    const enet_buffer_config_t *buffCfg = bufferConfig;
#ifdef ENET_ENHANCEDBUFFERDESCRIPTOR_MODE
    uint32_t mask = (kENET_RxFrameInterrupt | kENET_RxBufferInterrupt);
#endif /* ENET_ENHANCEDBUFFERDESCRIPTOR_MODE */

    /* Check the input parameters. */
    for (ringNum = 0; ringNum < config->ringNum; ringNum++)
    {
        assert(buffCfg->rxBuffSizeAlign >= ENET_RX_MIN_BUFFERSIZE);
#ifdef ENET_ENHANCEDBUFFERDESCRIPTOR_MODE
#if FSL_FEATURE_ENET_QUEUE > 1
        if (ringNum == 1)
        {
            mask = (kENET_RxFrame1Interrupt | kENET_RxBuffer1Interrupt);
        }
        else if (ringNum == 2)
        {
            mask = (kENET_RxFrame2Interrupt | kENET_RxBuffer2Interrupt);
        }
#endif /* FSL_FEATURE_ENET_QUEUE > 1 */
#endif /* ENET_ENHANCEDBUFFERDESCRIPTOR_MODE */

        if ((buffCfg->rxBdStartAddrAlign > 0) && (buffCfg->rxBufferAlign > 0))
        {
            volatile enet_rx_bd_struct_t *curBuffDescrip = buffCfg->rxBdStartAddrAlign;
            rxBuffSizeAlign = buffCfg->rxBuffSizeAlign;
#if defined(FSL_FEATURE_MEMORY_HAS_ADDRESS_OFFSET) && FSL_FEATURE_MEMORY_HAS_ADDRESS_OFFSET
            rxBuffer = (uint8_t *)MEMORY_ConvertMemoryMapAddress((uint32_t)buffCfg->rxBufferAlign, kMEMORY_Local2DMA);
#else
            rxBuffer = buffCfg->rxBufferAlign;
#endif

#if defined(FSL_SDK_ENABLE_DRIVER_CACHE_CONTROL) && FSL_SDK_ENABLE_DRIVER_CACHE_CONTROL
            /* Invalidate rx buffers before DMA transfer data into them. */
            DCACHE_InvalidateByRange((uint32_t)rxBuffer, (buffCfg->rxBdNumber * rxBuffSizeAlign));
#endif /* FSL_SDK_ENABLE_DRIVER_CACHE_CONTROL */

            for (count = 0; count < buffCfg->rxBdNumber; count++)
            {
                /* Set data buffer and the length. */
                curBuffDescrip->buffer = (uint8_t *)((uint32_t)&rxBuffer[count * rxBuffSizeAlign]);
                curBuffDescrip->length = 0;

                /* Initializes the buffer descriptors with empty bit. */
                curBuffDescrip->control = ENET_BUFFDESCRIPTOR_RX_EMPTY_MASK;
                /* Sets the last buffer descriptor with the wrap flag. */
                if (count == buffCfg->rxBdNumber - 1)
                {
                    curBuffDescrip->control |= ENET_BUFFDESCRIPTOR_RX_WRAP_MASK;
                }

#ifdef ENET_ENHANCEDBUFFERDESCRIPTOR_MODE
                if (config->interrupt & mask)
                {
                    /* Enable receive interrupt. */
                    curBuffDescrip->controlExtend1 |= ENET_BUFFDESCRIPTOR_RX_INTERRUPT_MASK;
                }
                else
                {
                    curBuffDescrip->controlExtend1 = 0;
                }
#endif /* ENET_ENHANCEDBUFFERDESCRIPTOR_MODE */
                /* Increase the index. */
                curBuffDescrip++;
            }
        }
        buffCfg++;
    }
}

static void ENET_ActiveSend(ENET_Type *base, uint32_t ringId)
{
    assert(ringId < FSL_FEATURE_ENET_QUEUE);
    __DSB();

    switch (ringId)
    {
        case kENET_Ring0:
            base->TDAR = ENET_TDAR_TDAR_MASK;
            break;
#if FSL_FEATURE_ENET_QUEUE > 1
        case kENET_Ring1:
            base->TDAR1 = ENET_TDAR1_TDAR_MASK;
            break;
        case kENET_Ring2:
            base->TDAR2 = ENET_TDAR2_TDAR_MASK;
            break;
#endif /* FSL_FEATURE_ENET_QUEUE > 1 */
        default:
            base->TDAR = ENET_TDAR_TDAR_MASK;
            break;
    }
}

/*!
 * brief Sets the ENET MII speed and duplex.
 *
 * This API is provided to dynamically change the speed and dulpex for MAC.
 *
 * param base  ENET peripheral base address.
 * param speed The speed of the RMII mode.
 * param duplex The duplex of the RMII mode.
 */
void ENET_SetMII(ENET_Type *base, enet_mii_speed_t speed, enet_mii_duplex_t duplex)
{
    uint32_t rcr = base->RCR;
    uint32_t tcr = base->TCR;

#if defined(FSL_FEATURE_ENET_HAS_AVB) && FSL_FEATURE_ENET_HAS_AVB
    uint32_t ecr = base->ECR;

    if (kENET_MiiSpeed1000M == speed)
    {
        assert(duplex == kENET_MiiFullDuplex);
        ecr |= ENET_ECR_SPEED_MASK;
    }
    else
    {
        ecr &= ~ENET_ECR_SPEED_MASK;
    }

    base->ECR = ecr;
#endif /* FSL_FEATURE_ENET_HAS_AVB */

    /* Sets speed mode. */
    if (kENET_MiiSpeed10M == speed)
    {
        rcr |= ENET_RCR_RMII_10T_MASK;
    }
    else
    {
        rcr &= ~ENET_RCR_RMII_10T_MASK;
    }
    /* Set duplex mode. */
    if (duplex == kENET_MiiHalfDuplex)
    {
        rcr |= ENET_RCR_DRT_MASK;
        tcr &= ~ENET_TCR_FDEN_MASK;
    }
    else
    {
        rcr &= ~ENET_RCR_DRT_MASK;
        tcr |= ENET_TCR_FDEN_MASK;
    }

    base->RCR = rcr;
    base->TCR = tcr;
}

/*!
 * brief Sets the ENET module Mac address.
 *
 * param base  ENET peripheral base address.
 * param macAddr The six-byte Mac address pointer.
 *        The pointer is allocated by application and input into the API.
 */
void ENET_SetMacAddr(ENET_Type *base, uint8_t *macAddr)
{
    uint32_t address;

    /* Set physical address lower register. */
    address = (uint32_t)(((uint32_t)macAddr[0] << 24U) | ((uint32_t)macAddr[1] << 16U) | ((uint32_t)macAddr[2] << 8U) |
                         (uint32_t)macAddr[3]);
    base->PALR = address;
    /* Set physical address high register. */
    address = (uint32_t)(((uint32_t)macAddr[4] << 8U) | ((uint32_t)macAddr[5]));
    base->PAUR = address << ENET_PAUR_PADDR2_SHIFT;
}

/*!
 * brief Gets the ENET module Mac address.
 *
 * param base  ENET peripheral base address.
 * param macAddr The six-byte Mac address pointer.
 *        The pointer is allocated by application and input into the API.
 */
void ENET_GetMacAddr(ENET_Type *base, uint8_t *macAddr)
{
    assert(macAddr);

    uint32_t address;

    /* Get from physical address lower register. */
    address = base->PALR;
    macAddr[0] = 0xFFU & (address >> 24U);
    macAddr[1] = 0xFFU & (address >> 16U);
    macAddr[2] = 0xFFU & (address >> 8U);
    macAddr[3] = 0xFFU & address;

    /* Get from physical address high register. */
    address = (base->PAUR & ENET_PAUR_PADDR2_MASK) >> ENET_PAUR_PADDR2_SHIFT;
    macAddr[4] = 0xFFU & (address >> 8U);
    macAddr[5] = 0xFFU & address;
}

/*!
 * brief Sets the ENET SMI(serial management interface)- MII management interface.
 *
 * param base  ENET peripheral base address.
 * param srcClock_Hz This is the ENET module clock frequency. Normally it's the system clock. See clock distribution.
 * param isPreambleDisabled The preamble disable flag.
 *        - true   Enables the preamble.
 *        - false  Disables the preamble.
 */
void ENET_SetSMI(ENET_Type *base, uint32_t srcClock_Hz, bool isPreambleDisabled)
{
    assert(srcClock_Hz);

    uint32_t clkCycle = 0;
    uint32_t speed = 0;
    uint32_t mscr = 0;

    /* Calculate the MII speed which controls the frequency of the MDC. */
    speed = srcClock_Hz / (2 * ENET_MDC_FREQUENCY);
    /* Calculate the hold time on the MDIO output. */
    clkCycle = (10 + ENET_NANOSECOND_ONE_SECOND / srcClock_Hz - 1) / (ENET_NANOSECOND_ONE_SECOND / srcClock_Hz) - 1;
    /* Build the configuration for MDC/MDIO control. */
    mscr =
        ENET_MSCR_MII_SPEED(speed) | ENET_MSCR_HOLDTIME(clkCycle) | (isPreambleDisabled ? ENET_MSCR_DIS_PRE_MASK : 0);
    base->MSCR = mscr;
}

/*!
 * brief Starts an SMI write command.
 *
 * Used for standard IEEE802.3 MDIO Clause 22 format.
 *
 * param base  ENET peripheral base address.
 * param phyAddr The PHY address.
 * param phyReg The PHY register. Range from 0 ~ 31.
 * param operation The write operation.
 * param data The data written to PHY.
 */
void ENET_StartSMIWrite(ENET_Type *base, uint32_t phyAddr, uint32_t phyReg, enet_mii_write_t operation, uint32_t data)
{
    uint32_t mmfr = 0;

    /* Build MII write command. */
    mmfr = ENET_MMFR_ST(1) | ENET_MMFR_OP(operation) | ENET_MMFR_PA(phyAddr) | ENET_MMFR_RA(phyReg) | ENET_MMFR_TA(2) |
           (data & 0xFFFF);
    base->MMFR = mmfr;
}

/*!
 * brief Starts an SMI (Serial Management Interface) read command.
 *
 * Used for standard IEEE802.3 MDIO Clause 22 format.
 *
 * param base  ENET peripheral base address.
 * param phyAddr The PHY address.
 * param phyReg The PHY register. Range from 0 ~ 31.
 * param operation The read operation.
 */
void ENET_StartSMIRead(ENET_Type *base, uint32_t phyAddr, uint32_t phyReg, enet_mii_read_t operation)
{
    uint32_t mmfr = 0;

    /* Build MII read command. */
    mmfr = ENET_MMFR_ST(1) | ENET_MMFR_OP(operation) | ENET_MMFR_PA(phyAddr) | ENET_MMFR_RA(phyReg) | ENET_MMFR_TA(2);
    base->MMFR = mmfr;
}

#if defined(FSL_FEATURE_ENET_HAS_EXTEND_MDIO) && FSL_FEATURE_ENET_HAS_EXTEND_MDIO
/*!
 * brief Starts the extended IEEE802.3 Clause 45 MDIO format SMI write command.
 *
 * param base  ENET peripheral base address.
 * param phyAddr The PHY address.
 * param phyReg The PHY register. For MDIO IEEE802.3 Clause 45,
 *        the phyReg is a 21-bits combination of the devaddr (5 bits device address)
 *        and the regAddr (16 bits phy register): phyReg = (devaddr << 16) | regAddr.
 * param data The data written to PHY.
 */
void ENET_StartExtC45SMIWrite(ENET_Type *base, uint32_t phyAddr, uint32_t phyReg, uint32_t data)
{
    uint32_t mmfr = 0;

    /* Parse the address from the input register. */
    uint16_t devAddr = (phyReg >> ENET_MMFR_TA_SHIFT) & 0x1FU;
    uint16_t regAddr = (uint16_t)(phyReg & 0xFFFFU);

    /* Address write firstly. */
    mmfr = ENET_MMFR_ST(0) | ENET_MMFR_OP(kENET_MiiAddrWrite_C45) | ENET_MMFR_PA(phyAddr) | ENET_MMFR_RA(devAddr) |
           ENET_MMFR_TA(2) | ENET_MMFR_DATA(regAddr);
    base->MMFR = mmfr;

    /* Build MII write command. */
    mmfr = ENET_MMFR_ST(0) | ENET_MMFR_OP(kENET_MiiWriteFrame_C45) | ENET_MMFR_PA(phyAddr) | ENET_MMFR_RA(devAddr) |
           ENET_MMFR_TA(2) | ENET_MMFR_DATA(data);
    base->MMFR = mmfr;
}

/*!
 * brief Starts the extended IEEE802.3 Clause 45 MDIO format SMI read command.
 *
 * param base  ENET peripheral base address.
 * param phyAddr The PHY address.
 * param phyReg The PHY register. For MDIO IEEE802.3 Clause 45,
 *        the phyReg is a 21-bits combination of the devaddr (5 bits device address)
 *        and the regAddr (16 bits phy register): phyReg = (devaddr << 16) | regAddr.
 */
void ENET_StartExtC45SMIRead(ENET_Type *base, uint32_t phyAddr, uint32_t phyReg)
{
    uint32_t mmfr = 0;

    /* Parse the address from the input register. */
    uint16_t devAddr = (phyReg >> ENET_MMFR_TA_SHIFT) & 0x1FU;
    uint16_t regAddr = (uint16_t)(phyReg & 0xFFFFU);

    /* Address write firstly. */
    mmfr = ENET_MMFR_ST(0) | ENET_MMFR_OP(kENET_MiiAddrWrite_C45) | ENET_MMFR_PA(phyAddr) | ENET_MMFR_RA(devAddr) |
           ENET_MMFR_TA(2) | ENET_MMFR_DATA(regAddr);
    base->MMFR = mmfr;

    /* Build MII read command. */
    mmfr = ENET_MMFR_ST(0) | ENET_MMFR_OP(kENET_MiiReadFrame_C45) | ENET_MMFR_PA(phyAddr) | ENET_MMFR_RA(devAddr) |
           ENET_MMFR_TA(2);
    base->MMFR = mmfr;
}
#endif /* FSL_FEATURE_ENET_HAS_EXTEND_MDIO */

/*!
 * brief Gets the error statistics of a received frame for ENET single ring.
 *
 * This API must be called after the ENET_GetRxFrameSize and before the ENET_ReadFrame().
 * If the ENET_GetRxFrameSize returns kStatus_ENET_RxFrameError,
 * the ENET_GetRxErrBeforeReadFrame can be used to get the exact error statistics.
 * This is an example.
 * code
 *       status = ENET_GetRxFrameSize(&g_handle, &length);
 *       if (status == kStatus_ENET_RxFrameError)
 *       {
 *           // Get the error information of the received frame.
 *           ENET_GetRxErrBeforeReadFrame(&g_handle, &eErrStatic);
 *           // update the receive buffer.
 *           ENET_ReadFrame(EXAMPLE_ENET, &g_handle, NULL, 0);
 *       }
 * endcode
 * param handle The ENET handler structure pointer. This is the same handler pointer used in the ENET_Init.
 * param eErrorStatic The error statistics structure pointer.
 */
void ENET_GetRxErrBeforeReadFrame(enet_handle_t *handle, enet_data_error_stats_t *eErrorStatic)
{
    assert(handle);
    assert(handle->rxBdCurrent[0]);
    assert(eErrorStatic);

    uint16_t control = 0;
    volatile enet_rx_bd_struct_t *curBuffDescrip = handle->rxBdCurrent[0];

    do
    {
        /* The last buffer descriptor of a frame. */
        if (curBuffDescrip->control & ENET_BUFFDESCRIPTOR_RX_LAST_MASK)
        {
            control = curBuffDescrip->control;
            if (control & ENET_BUFFDESCRIPTOR_RX_TRUNC_MASK)
            {
                /* The receive truncate error. */
                eErrorStatic->statsRxTruncateErr++;
            }
            if (control & ENET_BUFFDESCRIPTOR_RX_OVERRUN_MASK)
            {
                /* The receive over run error. */
                eErrorStatic->statsRxOverRunErr++;
            }
            if (control & ENET_BUFFDESCRIPTOR_RX_LENVLIOLATE_MASK)
            {
                /* The receive length violation error. */
                eErrorStatic->statsRxLenGreaterErr++;
            }
            if (control & ENET_BUFFDESCRIPTOR_RX_NOOCTET_MASK)
            {
                /* The receive alignment error. */
                eErrorStatic->statsRxAlignErr++;
            }
            if (control & ENET_BUFFDESCRIPTOR_RX_CRC_MASK)
            {
                /* The receive CRC error. */
                eErrorStatic->statsRxFcsErr++;
            }
#ifdef ENET_ENHANCEDBUFFERDESCRIPTOR_MODE
            uint16_t controlExt = curBuffDescrip->controlExtend1;
            if (controlExt & ENET_BUFFDESCRIPTOR_RX_MACERR_MASK)
            {
                /* The MAC error. */
                eErrorStatic->statsRxMacErr++;
            }
            if (controlExt & ENET_BUFFDESCRIPTOR_RX_PHYERR_MASK)
            {
                /* The PHY error. */
                eErrorStatic->statsRxPhyErr++;
            }
            if (controlExt & ENET_BUFFDESCRIPTOR_RX_COLLISION_MASK)
            {
                /* The receive collision error. */
                eErrorStatic->statsRxCollisionErr++;
            }
#endif /* ENET_ENHANCEDBUFFERDESCRIPTOR_MODE */

            break;
        }

        /* Increase the buffer descriptor, if it is the last one, increase to first one of the ring buffer. */
        if (curBuffDescrip->control & ENET_BUFFDESCRIPTOR_RX_WRAP_MASK)
        {
            curBuffDescrip = handle->rxBdBase[0];
        }
        else
        {
            curBuffDescrip++;
        }

    } while (curBuffDescrip != handle->rxBdCurrent[0]);
}

/*!
* brief Gets the size of the read frame for single ring.
*
* This function gets a received frame size from the ENET buffer descriptors.
* note The FCS of the frame is automatically removed by MAC and the size is the length without the FCS.
* After calling ENET_GetRxFrameSize, ENET_ReadFrame() should be called to update the
* receive buffers If the result is not "kStatus_ENET_RxFrameEmpty".
*
* param handle The ENET handler structure. This is the same handler pointer used in the ENET_Init.
* param length The length of the valid frame received.
* retval kStatus_ENET_RxFrameEmpty No frame received. Should not call ENET_ReadFrame to read frame.
* retval kStatus_ENET_RxFrameError Data error happens. ENET_ReadFrame should be called with NULL data
*         and NULL length to update the receive buffers.
* retval kStatus_Success Receive a frame Successfully then the ENET_ReadFrame
*         should be called with the right data buffer and the captured data length input.
*/
status_t ENET_GetRxFrameSize(enet_handle_t *handle, uint32_t *length)
{
    assert(handle);
    assert(handle->rxBdCurrent[0]);
    assert(length);

    /* Reset the length to zero. */
    *length = 0;

    uint16_t validLastMask = ENET_BUFFDESCRIPTOR_RX_LAST_MASK | ENET_BUFFDESCRIPTOR_RX_EMPTY_MASK;
    volatile enet_rx_bd_struct_t *curBuffDescrip = handle->rxBdCurrent[0];

    /* Check the current buffer descriptor's empty flag.  if empty means there is no frame received. */
    if (curBuffDescrip->control & ENET_BUFFDESCRIPTOR_RX_EMPTY_MASK)
    {
        return kStatus_ENET_RxFrameEmpty;
    }

    do
    {
        /* Add check for abnormal case. */
        if ((!(curBuffDescrip->control & ENET_BUFFDESCRIPTOR_RX_EMPTY_MASK)) && (!curBuffDescrip->length))
        {
            return kStatus_ENET_RxFrameError;
        }

        /* Find the last buffer descriptor. */
        if ((curBuffDescrip->control & validLastMask) == ENET_BUFFDESCRIPTOR_RX_LAST_MASK)
        {
            /* The last buffer descriptor in the frame check the status of the received frame. */
            if ((curBuffDescrip->control & ENET_BUFFDESCRIPTOR_RX_ERR_MASK)
#ifdef ENET_ENHANCEDBUFFERDESCRIPTOR_MODE
                || (curBuffDescrip->controlExtend1 & ENET_BUFFDESCRIPTOR_RX_EXT_ERR_MASK)
#endif /* ENET_ENHANCEDBUFFERDESCRIPTOR_MODE */
                    )
            {
                return kStatus_ENET_RxFrameError;
            }
            /* FCS is removed by MAC. */
            *length = curBuffDescrip->length;
            return kStatus_Success;
        }
        /* Increase the buffer descriptor, if it is the last one, increase to first one of the ring buffer. */
        if (curBuffDescrip->control & ENET_BUFFDESCRIPTOR_RX_WRAP_MASK)
        {
            curBuffDescrip = handle->rxBdBase[0];
        }
        else
        {
            curBuffDescrip++;
        }

    } while (curBuffDescrip != handle->rxBdCurrent[0]);

    /* The frame is on processing - set to empty status to make application to receive it next time. */
    return kStatus_ENET_RxFrameEmpty;
}

/*!
 * brief Reads a frame from the ENET device for single ring.
 * This function reads a frame (both the data and the length) from the ENET buffer descriptors.
 * The ENET_GetRxFrameSize should be used to get the size of the prepared data buffer.
 * This is an example:
 * code
 *       uint32_t length;
 *       enet_handle_t g_handle;
 *       //Get the received frame size firstly.
 *       status = ENET_GetRxFrameSize(&g_handle, &length);
 *       if (length != 0)
 *       {
 *           //Allocate memory here with the size of "length"
 *           uint8_t *data = memory allocate interface;
 *           if (!data)
 *           {
 *               ENET_ReadFrame(ENET, &g_handle, NULL, 0);
 *               //Add the console warning log.
 *           }
 *           else
 *           {
 *              status = ENET_ReadFrame(ENET, &g_handle, data, length);
 *              //Call stack input API to deliver the data to stack
 *           }
 *       }
 *       else if (status == kStatus_ENET_RxFrameError)
 *       {
 *          //Update the received buffer when a error frame is received.
 *           ENET_ReadFrame(ENET, &g_handle, NULL, 0);
 *       }
 * endcode
 * param base  ENET peripheral base address.
 * param handle The ENET handler structure. This is the same handler pointer used in the ENET_Init.
 * param data The data buffer provided by user to store the frame which memory size should be at least "length".
 * param length The size of the data buffer which is still the length of the received frame.
 * return The execute status, successful or failure.
 */
status_t ENET_ReadFrame(ENET_Type *base, enet_handle_t *handle, uint8_t *data, uint32_t length)
{
    assert(handle);
    assert(handle->rxBdCurrent[0]);

    uint32_t len = 0;
    uint32_t offset = 0;
    uint16_t control;
    bool isLastBuff = false;
    volatile enet_rx_bd_struct_t *curBuffDescrip = handle->rxBdCurrent[0];
    status_t result = kStatus_Success;
    uint32_t address;

    /* For data-NULL input, only update the buffer descriptor. */
    if (!data)
    {
        do
        {
            /* Update the control flag. */
            control = handle->rxBdCurrent[0]->control;
            /* Updates the receive buffer descriptors. */
            ENET_UpdateReadBuffers(base, handle, 0);

            /* Find the last buffer descriptor for the frame. */
            if (control & ENET_BUFFDESCRIPTOR_RX_LAST_MASK)
            {
                break;
            }

        } while (handle->rxBdCurrent[0] != curBuffDescrip);

        return result;
    }
    else
    {
/* A frame on one buffer or several receive buffers are both considered. */
#if defined(FSL_FEATURE_MEMORY_HAS_ADDRESS_OFFSET) && FSL_FEATURE_MEMORY_HAS_ADDRESS_OFFSET
        address = MEMORY_ConvertMemoryMapAddress((uint32_t)curBuffDescrip->buffer, kMEMORY_DMA2Local);
#else
        address = (uint32_t)curBuffDescrip->buffer;
#endif /* FSL_FEATURE_MEMORY_HAS_ADDRESS_OFFSET */
#if defined(FSL_SDK_ENABLE_DRIVER_CACHE_CONTROL) && FSL_SDK_ENABLE_DRIVER_CACHE_CONTROL
        /* Add the cache invalidate maintain. */
        DCACHE_InvalidateByRange(address, handle->rxBuffSizeAlign[0]);
#endif /* FSL_SDK_ENABLE_DRIVER_CACHE_CONTROL */
#ifdef ENET_ENHANCEDBUFFERDESCRIPTOR_MODE
        enet_ptp_time_data_t ptpTimestamp;
        bool isPtpEventMessage = false;
        /* Parse the PTP message according to the header message. */
        isPtpEventMessage = ENET_Ptp1588ParseFrame((uint8_t *)address, &ptpTimestamp, false);
#endif /* ENET_ENHANCEDBUFFERDESCRIPTOR_MODE */

        while (!isLastBuff)
        {
            /* The last buffer descriptor of a frame. */
            if (curBuffDescrip->control & ENET_BUFFDESCRIPTOR_RX_LAST_MASK)
            {
                /* This is a valid frame. */
                isLastBuff = true;
                if (length == curBuffDescrip->length)
                {
                    /* Copy the frame to user's buffer without FCS. */
                    len = curBuffDescrip->length - offset;
                    memcpy(data + offset, (void *)address, len);
#ifdef ENET_ENHANCEDBUFFERDESCRIPTOR_MODE
                    /* Store the PTP 1588 timestamp for received PTP event frame. */
                    if (isPtpEventMessage)
                    {
                        /* Set the timestamp to the timestamp ring. */
                        ptpTimestamp.timeStamp.nanosecond = curBuffDescrip->timestamp;
                        result = ENET_StoreRxFrameTime(base, handle, &ptpTimestamp);
                    }
#endif /* ENET_ENHANCEDBUFFERDESCRIPTOR_MODE */

                    /* Updates the receive buffer descriptors. */
                    ENET_UpdateReadBuffers(base, handle, 0);
                    return result;
                }
                else
                {
                    /* Updates the receive buffer descriptors. */
                    ENET_UpdateReadBuffers(base, handle, 0);
                }
            }
            else
            {
                /* Store a frame on several buffer descriptors. */
                isLastBuff = false;
                /* Length check. */
                if (offset >= length)
                {
                    break;
                }

                memcpy(data + offset, (void *)address, handle->rxBuffSizeAlign[0]);
                offset += handle->rxBuffSizeAlign[0];

                /* Updates the receive buffer descriptors. */
                ENET_UpdateReadBuffers(base, handle, 0);
            }

            /* Get the current buffer descriptor. */
            curBuffDescrip = handle->rxBdCurrent[0];
/* Add the cache invalidate maintain. */
#if defined(FSL_FEATURE_MEMORY_HAS_ADDRESS_OFFSET) && FSL_FEATURE_MEMORY_HAS_ADDRESS_OFFSET
            address = MEMORY_ConvertMemoryMapAddress((uint32_t)curBuffDescrip->buffer, kMEMORY_DMA2Local);
#else
            address = (uint32_t)curBuffDescrip->buffer;
#endif /* FSL_FEATURE_MEMORY_HAS_ADDRESS_OFFSET */
#if defined(FSL_SDK_ENABLE_DRIVER_CACHE_CONTROL) && FSL_SDK_ENABLE_DRIVER_CACHE_CONTROL
            DCACHE_InvalidateByRange(address, handle->rxBuffSizeAlign[0]);
#endif /* FSL_SDK_ENABLE_DRIVER_CACHE_CONTROL */
        }
    }

    return kStatus_ENET_RxFrameFail;
}

static void ENET_UpdateReadBuffers(ENET_Type *base, enet_handle_t *handle, uint32_t ringId)
{
    assert(handle);
    assert(ringId < FSL_FEATURE_ENET_QUEUE);

    /* Clears status. */
    handle->rxBdCurrent[ringId]->control &= ENET_BUFFDESCRIPTOR_RX_WRAP_MASK;
    /* Sets the receive buffer descriptor with the empty flag. */
    handle->rxBdCurrent[ringId]->control |= ENET_BUFFDESCRIPTOR_RX_EMPTY_MASK;

    /* Increase current buffer descriptor to the next one. */
    if (handle->rxBdCurrent[ringId]->control & ENET_BUFFDESCRIPTOR_RX_WRAP_MASK)
    {
        handle->rxBdCurrent[ringId] = handle->rxBdBase[ringId];
    }
    else
    {
        handle->rxBdCurrent[ringId]++;
    }

    __DSB();

    /* Actives the receive buffer descriptor. */
    switch (ringId)
    {
        case kENET_Ring0:
            base->RDAR = ENET_RDAR_RDAR_MASK;
            break;
#if FSL_FEATURE_ENET_QUEUE > 1
        case kENET_Ring1:
            base->RDAR1 = ENET_RDAR1_RDAR_MASK;
            break;
        case kENET_Ring2:
            base->RDAR2 = ENET_RDAR2_RDAR_MASK;
            break;
#endif /* FSL_FEATURE_ENET_QUEUE > 1 */
        default:
            base->RDAR = ENET_RDAR_RDAR_MASK;
            break;
    }
}

/*!
 * brief Transmits an ENET frame for single ring.
 * note The CRC is automatically appended to the data. Input the data
 * to send without the CRC.
 *
 *
 * param base  ENET peripheral base address.
 * param handle The ENET handler pointer. This is the same handler pointer used in the ENET_Init.
 * param data The data buffer provided by user to be send.
 * param length The length of the data to be send.
 * retval kStatus_Success  Send frame succeed.
 * retval kStatus_ENET_TxFrameBusy  Transmit buffer descriptor is busy under transmission.
 *         The transmit busy happens when the data send rate is over the MAC capacity.
 *         The waiting mechanism is recommended to be added after each call return with
 *         kStatus_ENET_TxFrameBusy.
 */
status_t ENET_SendFrame(ENET_Type *base, enet_handle_t *handle, const uint8_t *data, uint32_t length)
{
    assert(handle);
    assert(data);

    volatile enet_tx_bd_struct_t *curBuffDescrip;
    uint32_t len = 0;
    uint32_t sizeleft = 0;
    uint32_t address;

    /* Check the frame length. */
    if (length > ENET_FRAME_MAX_FRAMELEN)
    {
        return kStatus_ENET_TxFrameOverLen;
    }

    /* Check if the transmit buffer is ready. */
    curBuffDescrip = handle->txBdCurrent[0];
    if (curBuffDescrip->control & ENET_BUFFDESCRIPTOR_TX_READY_MASK)
    {
        return kStatus_ENET_TxFrameBusy;
    }
#ifdef ENET_ENHANCEDBUFFERDESCRIPTOR_MODE
    bool isPtpEventMessage = false;
    /* Check PTP message with the PTP header. */
    isPtpEventMessage = ENET_Ptp1588ParseFrame(data, NULL, true);
#endif /* ENET_ENHANCEDBUFFERDESCRIPTOR_MODE */
    /* One transmit buffer is enough for one frame. */
    if (handle->txBuffSizeAlign[0] >= length)
    {
/* Copy data to the buffer for uDMA transfer. */
#if defined(FSL_FEATURE_MEMORY_HAS_ADDRESS_OFFSET) && FSL_FEATURE_MEMORY_HAS_ADDRESS_OFFSET
        address = MEMORY_ConvertMemoryMapAddress((uint32_t)curBuffDescrip->buffer, kMEMORY_DMA2Local);
#else
        address = (uint32_t)curBuffDescrip->buffer;
#endif /* FSL_FEATURE_MEMORY_HAS_ADDRESS_OFFSET */
        memcpy((void *)address, data, length);
#if defined(FSL_SDK_ENABLE_DRIVER_CACHE_CONTROL) && FSL_SDK_ENABLE_DRIVER_CACHE_CONTROL
        DCACHE_CleanByRange(address, length);
#endif /* FSL_SDK_ENABLE_DRIVER_CACHE_CONTROL */
        /* Set data length. */
        curBuffDescrip->length = length;
#ifdef ENET_ENHANCEDBUFFERDESCRIPTOR_MODE
        /* For enable the timestamp. */
        if (isPtpEventMessage)
        {
            curBuffDescrip->controlExtend1 |= ENET_BUFFDESCRIPTOR_TX_TIMESTAMP_MASK;
        }
        else
        {
            curBuffDescrip->controlExtend1 &= ~ENET_BUFFDESCRIPTOR_TX_TIMESTAMP_MASK;
        }

#endif /* ENET_ENHANCEDBUFFERDESCRIPTOR_MODE */
        curBuffDescrip->control |= (ENET_BUFFDESCRIPTOR_TX_READY_MASK | ENET_BUFFDESCRIPTOR_TX_LAST_MASK);

        /* Increase the buffer descriptor address. */
        if (curBuffDescrip->control & ENET_BUFFDESCRIPTOR_TX_WRAP_MASK)
        {
            handle->txBdCurrent[0] = handle->txBdBase[0];
        }
        else
        {
            handle->txBdCurrent[0]++;
        }
        /* Active the transmit buffer descriptor. */
        ENET_ActiveSend(base, 0);

        return kStatus_Success;
    }
    else
    {
        /* One frame requires more than one transmit buffers. */
        do
        {
#ifdef ENET_ENHANCEDBUFFERDESCRIPTOR_MODE
            /* For enable the timestamp. */
            if (isPtpEventMessage)
            {
                curBuffDescrip->controlExtend1 |= ENET_BUFFDESCRIPTOR_TX_TIMESTAMP_MASK;
            }
            else
            {
                curBuffDescrip->controlExtend1 &= ~ENET_BUFFDESCRIPTOR_TX_TIMESTAMP_MASK;
            }
#endif /* ENET_ENHANCEDBUFFERDESCRIPTOR_MODE */

            /* Increase the buffer descriptor address. */
            if (curBuffDescrip->control & ENET_BUFFDESCRIPTOR_TX_WRAP_MASK)
            {
                handle->txBdCurrent[0] = handle->txBdBase[0];
            }
            else
            {
                handle->txBdCurrent[0]++;
            }
            /* update the size left to be transmit. */
            sizeleft = length - len;
#if defined(FSL_FEATURE_MEMORY_HAS_ADDRESS_OFFSET) && FSL_FEATURE_MEMORY_HAS_ADDRESS_OFFSET
            address = MEMORY_ConvertMemoryMapAddress((uint32_t)curBuffDescrip->buffer, kMEMORY_DMA2Local);
#else
            address = (uint32_t)curBuffDescrip->buffer;
#endif /* FSL_FEATURE_MEMORY_HAS_ADDRESS_OFFSET */
            if (sizeleft > handle->txBuffSizeAlign[0])
            {
                /* Data copy. */
                memcpy((void *)address, data + len, handle->txBuffSizeAlign[0]);
#if defined(FSL_SDK_ENABLE_DRIVER_CACHE_CONTROL) && FSL_SDK_ENABLE_DRIVER_CACHE_CONTROL
                /* Add the cache clean maintain. */
                DCACHE_CleanByRange(address, handle->txBuffSizeAlign[0]);
#endif /* FSL_SDK_ENABLE_DRIVER_CACHE_CONTROL */
                /* Data length update. */
                curBuffDescrip->length = handle->txBuffSizeAlign[0];
                len += handle->txBuffSizeAlign[0];
                /* Sets the control flag. */
                curBuffDescrip->control &= ~ENET_BUFFDESCRIPTOR_TX_LAST_MASK;
                curBuffDescrip->control |= ENET_BUFFDESCRIPTOR_TX_READY_MASK;
                /* Active the transmit buffer descriptor*/
                ENET_ActiveSend(base, 0);
            }
            else
            {
                memcpy((void *)address, data + len, sizeleft);
#if defined(FSL_SDK_ENABLE_DRIVER_CACHE_CONTROL) && FSL_SDK_ENABLE_DRIVER_CACHE_CONTROL
                /* Add the cache clean maintain. */
                DCACHE_CleanByRange(address, sizeleft);
#endif /* FSL_SDK_ENABLE_DRIVER_CACHE_CONTROL */
                curBuffDescrip->length = sizeleft;
                /* Set Last buffer wrap flag. */
                curBuffDescrip->control |= ENET_BUFFDESCRIPTOR_TX_READY_MASK | ENET_BUFFDESCRIPTOR_TX_LAST_MASK;
                /* Active the transmit buffer descriptor. */
                ENET_ActiveSend(base, 0);

                return kStatus_Success;
            }

            /* Get the current buffer descriptor address. */
            curBuffDescrip = handle->txBdCurrent[0];

        } while (!(curBuffDescrip->control & ENET_BUFFDESCRIPTOR_TX_READY_MASK));

        return kStatus_ENET_TxFrameBusy;
    }
}

#if FSL_FEATURE_ENET_QUEUE > 1
/*!
 * brief Gets the error statistics of received frame for extended multi-ring.
 *
 * This API must be called after the ENET_GetRxFrameSizeMultiRing and before the ENET_ReadFrameMultiRing().
 * If the ENET_GetRxFrameSizeMultiRing returns kStatus_ENET_RxFrameError,
 * the ENET_GetRxErrBeforeReadFrameMultiRing can be used to get the exact error statistics.
 *
 * param handle The ENET handler structure pointer. This is the same handler pointer used in the ENET_Init.
 * param eErrorStatic The error statistics structure pointer.
 * param ringId The ring index, range from 0 ~ FSL_FEATURE_ENET_QUEUE - 1.
 */
void ENET_GetRxErrBeforeReadFrameMultiRing(enet_handle_t *handle,
                                           enet_data_error_stats_t *eErrorStatic,
                                           uint32_t ringId)
{
    assert(handle);
    assert(eErrorStatic);
    assert(ringId < FSL_FEATURE_ENET_QUEUE);

    uint16_t control = 0;
    volatile enet_rx_bd_struct_t *curBuffDescrip = handle->rxBdCurrent[ringId];

    do
    {
        /* The last buffer descriptor of a frame. */
        if (curBuffDescrip->control & ENET_BUFFDESCRIPTOR_RX_LAST_MASK)
        {
            control = curBuffDescrip->control;
            if (control & ENET_BUFFDESCRIPTOR_RX_TRUNC_MASK)
            {
                /* The receive truncate error. */
                eErrorStatic->statsRxTruncateErr++;
            }
            if (control & ENET_BUFFDESCRIPTOR_RX_OVERRUN_MASK)
            {
                /* The receive over run error. */
                eErrorStatic->statsRxOverRunErr++;
            }
            if (control & ENET_BUFFDESCRIPTOR_RX_LENVLIOLATE_MASK)
            {
                /* The receive length violation error. */
                eErrorStatic->statsRxLenGreaterErr++;
            }
            if (control & ENET_BUFFDESCRIPTOR_RX_NOOCTET_MASK)
            {
                /* The receive alignment error. */
                eErrorStatic->statsRxAlignErr++;
            }
            if (control & ENET_BUFFDESCRIPTOR_RX_CRC_MASK)
            {
                /* The receive CRC error. */
                eErrorStatic->statsRxFcsErr++;
            }
#ifdef ENET_ENHANCEDBUFFERDESCRIPTOR_MODE
            uint16_t controlExt = curBuffDescrip->controlExtend1;
            if (controlExt & ENET_BUFFDESCRIPTOR_RX_MACERR_MASK)
            {
                /* The MAC error. */
                eErrorStatic->statsRxMacErr++;
            }
            if (controlExt & ENET_BUFFDESCRIPTOR_RX_PHYERR_MASK)
            {
                /* The PHY error. */
                eErrorStatic->statsRxPhyErr++;
            }
            if (controlExt & ENET_BUFFDESCRIPTOR_RX_COLLISION_MASK)
            {
                /* The receive collision error. */
                eErrorStatic->statsRxCollisionErr++;
            }
#endif /* ENET_ENHANCEDBUFFERDESCRIPTOR_MODE */

            break;
        }

        /* Increase the buffer descriptor, if it is the last one, increase to first one of the ring buffer. */
        if (curBuffDescrip->control & ENET_BUFFDESCRIPTOR_RX_WRAP_MASK)
        {
            curBuffDescrip = handle->rxBdBase[ringId];
        }
        else
        {
            curBuffDescrip++;
        }

    } while (curBuffDescrip != handle->rxBdCurrent[ringId]);
}

/*!
* brief Gets the size of the read frame for extended mutli-ring.
*
* This function gets a received frame size from the ENET buffer descriptors.
* note The FCS of the frame is automatically removed by MAC and the size is the length without the FCS.
* After calling ENET_GetRxFrameSizeMultiRing, ENET_ReadFrameMultiRing() should be called to update the
* receive buffers If the result is not "kStatus_ENET_RxFrameEmpty". The usage is
* the same to the single ring, refer to ENET_GetRxFrameSize.
*
* param handle The ENET handler structure. This is the same handler pointer used in the ENET_Init.
* param length The length of the valid frame received.
* param ringId The ring index or ring number;
* retval kStatus_ENET_RxFrameEmpty No frame received. Should not call ENET_ReadFrameMultiRing to read frame.
* retval kStatus_ENET_RxFrameError Data error happens. ENET_ReadFrameMultiRing should be called with NULL data
*         and NULL length to update the receive buffers.
* retval kStatus_Success Receive a frame Successfully then the ENET_ReadFrame
*         should be called with the right data buffer and the captured data length input.
*/
status_t ENET_GetRxFrameSizeMultiRing(enet_handle_t *handle, uint32_t *length, uint32_t ringId)
{
    assert(handle);
    assert(length);
    assert(ringId < FSL_FEATURE_ENET_QUEUE);

    /* Reset the length to zero. */
    *length = 0;
    uint16_t validLastMask = ENET_BUFFDESCRIPTOR_RX_LAST_MASK | ENET_BUFFDESCRIPTOR_RX_EMPTY_MASK;
    volatile enet_rx_bd_struct_t *curBuffDescrip;

    curBuffDescrip = handle->rxBdCurrent[ringId];
    /* Check the current buffer descriptor's empty flag.  if empty means there is no frame received. */
    if (curBuffDescrip->control & ENET_BUFFDESCRIPTOR_RX_EMPTY_MASK)
    {
        return kStatus_ENET_RxFrameEmpty;
    }

    do
    {
        /* Add check for abnormal case. */
        if ((!(curBuffDescrip->control & ENET_BUFFDESCRIPTOR_RX_EMPTY_MASK)) && (!curBuffDescrip->length))
        {
            return kStatus_ENET_RxFrameError;
        }
        /* Find the last buffer descriptor. */
        if ((curBuffDescrip->control & validLastMask) == ENET_BUFFDESCRIPTOR_RX_LAST_MASK)
        {
            /* The last buffer descriptor in the frame check the status of the received frame. */
            if ((curBuffDescrip->control & ENET_BUFFDESCRIPTOR_RX_ERR_MASK)
#ifdef ENET_ENHANCEDBUFFERDESCRIPTOR_MODE
                || (curBuffDescrip->controlExtend1 & ENET_BUFFDESCRIPTOR_RX_EXT_ERR_MASK)
#endif /* ENET_ENHANCEDBUFFERDESCRIPTOR_MODE */
                    )
            {
                return kStatus_ENET_RxFrameError;
            }
            /* FCS is removed by MAC. */
            *length = curBuffDescrip->length;
            return kStatus_Success;
        }
        /* Increase the buffer descriptor, if it is the last one, increase to first one of the ring buffer. */
        if (curBuffDescrip->control & ENET_BUFFDESCRIPTOR_RX_WRAP_MASK)
        {
            curBuffDescrip = handle->rxBdBase[ringId];
        }
        else
        {
            curBuffDescrip++;
        }
    } while (curBuffDescrip != handle->rxBdCurrent[ringId]);

    /* The frame is on processing - set to empty status to make application to receive it next time. */
    return kStatus_ENET_RxFrameEmpty;
}

/*!
 * brief Reads a frame from the ENET device for multi-ring.
 *
 * This function reads a frame (both the data and the length) from the ENET buffer descriptors.
 * The ENET_GetRxFrameSizeMultiRing should be used to get the size of the prepared data buffer.
 * This usage is the same as the single ring, refer to ENET_ReadFrame.

 * param base  ENET peripheral base address.
 * param handle The ENET handler structure. This is the same handler pointer used in the ENET_Init.
 * param data The data buffer provided by user to store the frame which memory size should be at least "length".
 * param length The size of the data buffer which is still the length of the received frame.
 * param ringId The ring index or ring number;
 * return The execute status, successful or failure.
 */
status_t ENET_ReadFrameMultiRing(
    ENET_Type *base, enet_handle_t *handle, uint8_t *data, uint32_t length, uint32_t ringId)
{
    assert(handle);
    assert(ringId < FSL_FEATURE_ENET_QUEUE);

    uint32_t len = 0;
    uint32_t offset = 0;
    uint16_t control;
    bool isLastBuff = false;
    volatile enet_rx_bd_struct_t *curBuffDescrip = handle->rxBdCurrent[ringId];
    status_t result = kStatus_Success;
    uint32_t address;

    /* For data-NULL input, only update the buffer descriptor. */
    if (!data)
    {
        do
        {
            /* Update the control flag. */
            control = handle->rxBdCurrent[ringId]->control;
            /* Updates the receive buffer descriptors. */
            ENET_UpdateReadBuffers(base, handle, ringId);

            /* Find the last buffer descriptor for the frame. */
            if (control & ENET_BUFFDESCRIPTOR_RX_LAST_MASK)
            {
                break;
            }

        } while (handle->rxBdCurrent[ringId] != curBuffDescrip);

        return result;
    }
    else
    {
/* A frame on one buffer or several receive buffers are both considered. */
#if defined(FSL_FEATURE_MEMORY_HAS_ADDRESS_OFFSET) && FSL_FEATURE_MEMORY_HAS_ADDRESS_OFFSET
        address = MEMORY_ConvertMemoryMapAddress((uint32_t)curBuffDescrip->buffer, kMEMORY_DMA2Local);
#else
        address = (uint32_t)curBuffDescrip->buffer;
#endif /* FSL_FEATURE_MEMORY_HAS_ADDRESS_OFFSET */
#if defined(FSL_SDK_ENABLE_DRIVER_CACHE_CONTROL) && FSL_SDK_ENABLE_DRIVER_CACHE_CONTROL
        /* Add the cache invalidate maintain. */
        DCACHE_InvalidateByRange(address, handle->rxBuffSizeAlign[ringId]);
#endif /* FSL_SDK_ENABLE_DRIVER_CACHE_CONTROL */
#ifdef ENET_ENHANCEDBUFFERDESCRIPTOR_MODE
        enet_ptp_time_data_t ptpTimestamp;
        bool isPtpEventMessage = false;
        /* Parse the PTP message according to the header message. */
        isPtpEventMessage = ENET_Ptp1588ParseFrame((uint8_t *)address, &ptpTimestamp, false);
#endif /* ENET_ENHANCEDBUFFERDESCRIPTOR_MODE */

        while (!isLastBuff)
        {
            /* The last buffer descriptor of a frame. */
            if (curBuffDescrip->control & ENET_BUFFDESCRIPTOR_RX_LAST_MASK)
            {
                /* This is a valid frame. */
                isLastBuff = true;
                if (length == curBuffDescrip->length)
                {
                    /* Copy the frame to user's buffer without FCS. */
                    len = curBuffDescrip->length - offset;
                    memcpy(data + offset, (void *)address, len);
#ifdef ENET_ENHANCEDBUFFERDESCRIPTOR_MODE
                    /* Store the PTP 1588 timestamp for received PTP event frame. */
                    if (isPtpEventMessage)
                    {
                        /* Set the timestamp to the timestamp ring. */
                        ptpTimestamp.timeStamp.nanosecond = curBuffDescrip->timestamp;
                        result = ENET_StoreRxFrameTime(base, handle, &ptpTimestamp);
                    }
#endif /* ENET_ENHANCEDBUFFERDESCRIPTOR_MODE */

                    /* Updates the receive buffer descriptors. */
                    ENET_UpdateReadBuffers(base, handle, ringId);
                    return result;
                }
                else
                {
                    /* Updates the receive buffer descriptors. */
                    ENET_UpdateReadBuffers(base, handle, ringId);
                }
            }
            else
            {
                /* Store a frame on several buffer descriptors. */
                isLastBuff = false;
                /* Length check. */
                if (offset >= length)
                {
                    break;
                }
                memcpy(data + offset, (void *)address, handle->rxBuffSizeAlign[ringId]);
                offset += handle->rxBuffSizeAlign[ringId];

                /* Updates the receive buffer descriptors. */
                ENET_UpdateReadBuffers(base, handle, ringId);
            }

            /* Get the current buffer descriptor. */

            curBuffDescrip = handle->rxBdCurrent[ringId];
#if defined(FSL_FEATURE_MEMORY_HAS_ADDRESS_OFFSET) && FSL_FEATURE_MEMORY_HAS_ADDRESS_OFFSET
            address = MEMORY_ConvertMemoryMapAddress((uint32_t)curBuffDescrip->buffer, kMEMORY_DMA2Local);
#else
            address = (uint32_t)curBuffDescrip->buffer;
#endif /* FSL_FEATURE_MEMORY_HAS_ADDRESS_OFFSET */
#if defined(FSL_SDK_ENABLE_DRIVER_CACHE_CONTROL) && FSL_SDK_ENABLE_DRIVER_CACHE_CONTROL
            /* Add the cache invalidate maintain. */
            DCACHE_InvalidateByRange(address, handle->rxBuffSizeAlign[ringId]);
#endif /* FSL_SDK_ENABLE_DRIVER_CACHE_CONTROL */
        }
    }

    return kStatus_ENET_RxFrameFail;
}

/*!
 * brief Transmits an ENET frame for extended multi-ring.
 * note The CRC is automatically appended to the data. Input the data
 * to send without the CRC.
 *
 * In this API, multiple-ring are mainly used for extended avb frames are supported.
 * The transmit scheme for avb frames is the credit-based scheme, the AVB class A, AVB class B
 * and the non-AVB frame are transmitted in ring 1, ring 2 and ring 0 independently.
 * So application should care about the transmit ring index when use multiple-ring transmission.
 *
 * param base  ENET peripheral base address.
 * param handle The ENET handler pointer. This is the same handler pointer used in the ENET_Init.
 * param data The data buffer provided by user to be send.
 * param length The length of the data to be send.
 * param ringId The ring index for transmission.
 * retval kStatus_Success  Send frame succeed.
 * retval kStatus_ENET_TxFrameBusy  Transmit buffer descriptor is busy under transmission.
 *         The transmit busy happens when the data send rate is over the MAC capacity.
 *         The waiting mechanism is recommended to be added after each call return with
 *         kStatus_ENET_TxFrameBusy.
 */
status_t ENET_SendFrameMultiRing(
    ENET_Type *base, enet_handle_t *handle, uint8_t *data, uint32_t length, uint32_t ringId)
{
    assert(handle);
    assert(data);
    assert(ringId < FSL_FEATURE_ENET_QUEUE);

    volatile enet_tx_bd_struct_t *curBuffDescrip;
    uint32_t len = 0;
    uint32_t sizeleft = 0;
    uint32_t address;

    /* Check the frame length. */
    if (length > ENET_FRAME_MAX_FRAMELEN)
    {
        return kStatus_ENET_TxFrameOverLen;
    }

    /* Check if the transmit buffer is ready. */
    curBuffDescrip = handle->txBdCurrent[ringId];
    if (curBuffDescrip->control & ENET_BUFFDESCRIPTOR_TX_READY_MASK)
    {
        return kStatus_ENET_TxFrameBusy;
    }
#ifdef ENET_ENHANCEDBUFFERDESCRIPTOR_MODE
    bool isPtpEventMessage = false;
    /* Check PTP message with the PTP header. */
    isPtpEventMessage = ENET_Ptp1588ParseFrame(data, NULL, true);
#endif /* ENET_ENHANCEDBUFFERDESCRIPTOR_MODE */
    /* One transmit buffer is enough for one frame. */
    if (handle->txBuffSizeAlign[ringId] >= length)
    {
/* Copy data to the buffer for uDMA transfer. */
#if defined(FSL_FEATURE_MEMORY_HAS_ADDRESS_OFFSET) && FSL_FEATURE_MEMORY_HAS_ADDRESS_OFFSET
        address = MEMORY_ConvertMemoryMapAddress((uint32_t)curBuffDescrip->buffer, kMEMORY_DMA2Local);
#else
        address = (uint32_t)curBuffDescrip->buffer;
#endif /* FSL_FEATURE_MEMORY_HAS_ADDRESS_OFFSET */
        memcpy((void *)address, data, length);

#if defined(FSL_SDK_ENABLE_DRIVER_CACHE_CONTROL) && FSL_SDK_ENABLE_DRIVER_CACHE_CONTROL
        /* Add the cache clean maintain. */
        DCACHE_CleanByRange(address, length);
#endif /* FSL_SDK_ENABLE_DRIVER_CACHE_CONTROL */

        /* Set data length. */
        curBuffDescrip->length = length;
#ifdef ENET_ENHANCEDBUFFERDESCRIPTOR_MODE
        /* For enable the timestamp. */
        if (isPtpEventMessage)
        {
            curBuffDescrip->controlExtend1 |= ENET_BUFFDESCRIPTOR_TX_TIMESTAMP_MASK;
        }
        else
        {
            curBuffDescrip->controlExtend1 &= ~ENET_BUFFDESCRIPTOR_TX_TIMESTAMP_MASK;
        }

#endif /* ENET_ENHANCEDBUFFERDESCRIPTOR_MODE */
        curBuffDescrip->control |= (ENET_BUFFDESCRIPTOR_TX_READY_MASK | ENET_BUFFDESCRIPTOR_TX_LAST_MASK);

        /* Increase the buffer descriptor address. */
        if (curBuffDescrip->control & ENET_BUFFDESCRIPTOR_TX_WRAP_MASK)
        {
            handle->txBdCurrent[ringId] = handle->txBdBase[ringId];
        }
        else
        {
            handle->txBdCurrent[ringId]++;
        }

        /* Active the transmit buffer descriptor. */
        ENET_ActiveSend(base, ringId);

        return kStatus_Success;
    }
    else
    {
        /* One frame requires more than one transmit buffers. */
        do
        {
#ifdef ENET_ENHANCEDBUFFERDESCRIPTOR_MODE
            /* For enable the timestamp. */
            if (isPtpEventMessage)
            {
                curBuffDescrip->controlExtend1 |= ENET_BUFFDESCRIPTOR_TX_TIMESTAMP_MASK;
            }
            else
            {
                curBuffDescrip->controlExtend1 &= ~ENET_BUFFDESCRIPTOR_TX_TIMESTAMP_MASK;
            }
#endif /* ENET_ENHANCEDBUFFERDESCRIPTOR_MODE */

            /* Increase the buffer descriptor address. */
            if (curBuffDescrip->control & ENET_BUFFDESCRIPTOR_TX_WRAP_MASK)
            {
                handle->txBdCurrent[ringId] = handle->txBdBase[ringId];
            }
            else
            {
                handle->txBdCurrent[ringId]++;
            }
            /* update the size left to be transmit. */
            sizeleft = length - len;
#if defined(FSL_FEATURE_MEMORY_HAS_ADDRESS_OFFSET) && FSL_FEATURE_MEMORY_HAS_ADDRESS_OFFSET
            address = MEMORY_ConvertMemoryMapAddress((uint32_t)curBuffDescrip->buffer, kMEMORY_DMA2Local);
#else
            address = (uint32_t)curBuffDescrip->buffer;
#endif /* FSL_FEATURE_MEMORY_HAS_ADDRESS_OFFSET */
            if (sizeleft > handle->txBuffSizeAlign[ringId])
            {
                /* Data copy. */
                memcpy((void *)address, data + len, handle->txBuffSizeAlign[ringId]);
#if defined(FSL_SDK_ENABLE_DRIVER_CACHE_CONTROL) && FSL_SDK_ENABLE_DRIVER_CACHE_CONTROL
                /* Add the cache clean maintain. */
                DCACHE_CleanByRange(address, handle->txBuffSizeAlign[ringId]);
#endif /* FSL_SDK_ENABLE_DRIVER_CACHE_CONTROL */
                /* Data length update. */
                curBuffDescrip->length = handle->txBuffSizeAlign[ringId];
                len += handle->txBuffSizeAlign[ringId];
                /* Sets the control flag. */
                curBuffDescrip->control &= ~ENET_BUFFDESCRIPTOR_TX_LAST_MASK;
                curBuffDescrip->control |= ENET_BUFFDESCRIPTOR_TX_READY_MASK;

                /* Active the transmit buffer descriptor*/
                ENET_ActiveSend(base, ringId);
            }
            else
            {
                memcpy((void *)address, data + len, sizeleft);
#if defined(FSL_SDK_ENABLE_DRIVER_CACHE_CONTROL) && FSL_SDK_ENABLE_DRIVER_CACHE_CONTROL
                /* Add the cache clean maintain. */
                DCACHE_CleanByRange(address, sizeleft);
#endif /* FSL_SDK_ENABLE_DRIVER_CACHE_CONTROL */
                curBuffDescrip->length = sizeleft;
                /* Set Last buffer wrap flag. */
                curBuffDescrip->control |= ENET_BUFFDESCRIPTOR_TX_READY_MASK | ENET_BUFFDESCRIPTOR_TX_LAST_MASK;

                /* Active the transmit buffer descriptor. */
                ENET_ActiveSend(base, ringId);

                return kStatus_Success;
            }

            /* Get the current buffer descriptor address. */
            curBuffDescrip = handle->txBdCurrent[ringId];
        } while (!(curBuffDescrip->control & ENET_BUFFDESCRIPTOR_TX_READY_MASK));

        return kStatus_ENET_TxFrameBusy;
    }
}
#endif /*  FSL_FEATURE_ENET_QUEUE > 1 */

/*!
 * brief Adds the ENET device to a multicast group.
 *
 * param base    ENET peripheral base address.
 * param address The six-byte multicast group address which is provided by application.
 */
void ENET_AddMulticastGroup(ENET_Type *base, uint8_t *address)
{
    assert(address);

    uint32_t crc = 0xFFFFFFFFU;
    uint32_t count1 = 0;
    uint32_t count2 = 0;

    /* Calculates the CRC-32 polynomial on the multicast group address. */
    for (count1 = 0; count1 < ENET_FRAME_MACLEN; count1++)
    {
        uint8_t c = address[count1];
        for (count2 = 0; count2 < 0x08U; count2++)
        {
            if ((c ^ crc) & 1U)
            {
                crc >>= 1U;
                c >>= 1U;
                crc ^= 0xEDB88320U;
            }
            else
            {
                crc >>= 1U;
                c >>= 1U;
            }
        }
    }

    /* Enable a multicast group address. */
    if (!((crc >> 0x1FU) & 1U))
    {
        base->GALR |= 1U << ((crc >> 0x1AU) & 0x1FU);
    }
    else
    {
        base->GAUR |= 1U << ((crc >> 0x1AU) & 0x1FU);
    }
}

/*!
 * brief Moves the ENET device from a multicast group.
 *
 * param base  ENET peripheral base address.
 * param address The six-byte multicast group address which is provided by application.
 */
void ENET_LeaveMulticastGroup(ENET_Type *base, uint8_t *address)
{
    assert(address);

    uint32_t crc = 0xFFFFFFFFU;
    uint32_t count1 = 0;
    uint32_t count2 = 0;

    /* Calculates the CRC-32 polynomial on the multicast group address. */
    for (count1 = 0; count1 < ENET_FRAME_MACLEN; count1++)
    {
        uint8_t c = address[count1];
        for (count2 = 0; count2 < 0x08U; count2++)
        {
            if ((c ^ crc) & 1U)
            {
                crc >>= 1U;
                c >>= 1U;
                crc ^= 0xEDB88320U;
            }
            else
            {
                crc >>= 1U;
                c >>= 1U;
            }
        }
    }

    /* Set the hash table. */
    if (!((crc >> 0x1FU) & 1U))
    {
        base->GALR &= ~(1U << ((crc >> 0x1AU) & 0x1FU));
    }
    else
    {
        base->GAUR &= ~(1U << ((crc >> 0x1AU) & 0x1FU));
    }
}

#ifdef ENET_ENHANCEDBUFFERDESCRIPTOR_MODE
/*!
 * brief Gets the ENET transmit frame statistics after the data send for single ring.
 *
 * This interface gets the error statistics of the transmit frame.
 * Because the error information is reported by the uDMA after the data delivery, this interface
 * should be called after the data transmit API. It is recommended to call this function on
 * transmit interrupt handler. After calling the ENET_SendFrame, the
 * transmit interrupt notifies the transmit completion.
 *
 * param handle The PTP handler pointer. This is the same handler pointer used in the ENET_Init.
 * param eErrorStatic The error statistics structure pointer.
 * return The execute status.
 */
status_t ENET_GetTxErrAfterSendFrame(enet_handle_t *handle, enet_data_error_stats_t *eErrorStatic)
{
    assert(handle);
    assert(eErrorStatic);

    uint16_t control = 0;
    uint16_t controlExt = 0;

    do
    {
        /* Get the current dirty transmit buffer descriptor. */
        control = handle->txBdDirtyStatic[0]->control;
        controlExt = handle->txBdDirtyStatic[0]->controlExtend0;

        /* Get the control status data, If the buffer descriptor has not been processed break out. */
        if (control & ENET_BUFFDESCRIPTOR_TX_READY_MASK)
        {
            return kStatus_ENET_TxFrameBusy;
        }
        /* Increase the transmit dirty static pointer. */
        if (handle->txBdDirtyStatic[0]->control & ENET_BUFFDESCRIPTOR_TX_WRAP_MASK)
        {
            handle->txBdDirtyStatic[0] = handle->txBdBase[0];
        }
        else
        {
            handle->txBdDirtyStatic[0]++;
        }

        /* If the transmit buffer descriptor is ready and the last buffer descriptor, store packet statistic. */
        if (control & ENET_BUFFDESCRIPTOR_TX_LAST_MASK)
        {
            if (controlExt & ENET_BUFFDESCRIPTOR_TX_ERR_MASK)
            {
                /* Transmit error. */
                eErrorStatic->statsTxErr++;
            }
            if (controlExt & ENET_BUFFDESCRIPTOR_TX_EXCCOLLISIONERR_MASK)
            {
                /* Transmit excess collision error. */
                eErrorStatic->statsTxExcessCollisionErr++;
            }
            if (controlExt & ENET_BUFFDESCRIPTOR_TX_LATECOLLISIONERR_MASK)
            {
                /* Transmit late collision error. */
                eErrorStatic->statsTxLateCollisionErr++;
            }
            if (controlExt & ENET_BUFFDESCRIPTOR_TX_UNDERFLOWERR_MASK)
            {
                /* Transmit under flow error. */
                eErrorStatic->statsTxUnderFlowErr++;
            }
            if (controlExt & ENET_BUFFDESCRIPTOR_TX_OVERFLOWERR_MASK)
            {
                /* Transmit over flow error. */
                eErrorStatic->statsTxOverFlowErr++;
            }
            return kStatus_Success;
        }

    } while (handle->txBdDirtyStatic[0] != handle->txBdCurrent[0]);

    return kStatus_ENET_TxFrameFail;
}

#if FSL_FEATURE_ENET_QUEUE > 1
/*!
 * brief Gets the ENET transmit frame statistics after the data send for extended multi-ring.
 *
 * This interface gets the error statistics of the transmit frame.
 * Because the error information is reported by the uDMA after the data delivery, this interface
 * should be called after the data transmit API and shall be called by transmit interrupt handler.
 * After calling the ENET_SendFrame, the transmit interrupt notifies the transmit completion.
 *
 * param handle The PTP handler pointer. This is the same handler pointer used in the ENET_Init.
 * param eErrorStatic The error statistics structure pointer.
 * param ringId The ring index.
 * return The execute status.
 */
status_t ENET_GetTxErrAfterSendFrameMultiRing(enet_handle_t *handle,
                                              enet_data_error_stats_t *eErrorStatic,
                                              uint32_t ringId)
{
    assert(handle);
    assert(eErrorStatic);
    assert(ringId < FSL_FEATURE_ENET_QUEUE);

    uint16_t control = 0;
    uint16_t controlExt = 0;

    do
    {
        /* Get the current dirty transmit buffer descriptor. */
        control = handle->txBdDirtyStatic[ringId]->control;
        controlExt = handle->txBdDirtyStatic[ringId]->controlExtend0;
        /* Get the control status data, If the buffer descriptor has not been processed break out. */
        if (control & ENET_BUFFDESCRIPTOR_TX_READY_MASK)
        {
            return kStatus_ENET_TxFrameBusy;
        }
        /* Increase the transmit dirty static pointer. */
        if (handle->txBdDirtyStatic[ringId]->control & ENET_BUFFDESCRIPTOR_TX_WRAP_MASK)
        {
            handle->txBdDirtyStatic[ringId] = handle->txBdBase[ringId];
        }
        else
        {
            handle->txBdDirtyStatic[ringId]++;
        }

        /* If the transmit buffer descriptor is ready and the last buffer descriptor, store packet statistic. */
        if (control & ENET_BUFFDESCRIPTOR_TX_LAST_MASK)
        {
            if (controlExt & ENET_BUFFDESCRIPTOR_TX_ERR_MASK)
            {
                /* Transmit error. */
                eErrorStatic->statsTxErr++;
            }
            if (controlExt & ENET_BUFFDESCRIPTOR_TX_EXCCOLLISIONERR_MASK)
            {
                /* Transmit excess collision error. */
                eErrorStatic->statsTxExcessCollisionErr++;
            }
            if (controlExt & ENET_BUFFDESCRIPTOR_TX_LATECOLLISIONERR_MASK)
            {
                /* Transmit late collision error. */
                eErrorStatic->statsTxLateCollisionErr++;
            }
            if (controlExt & ENET_BUFFDESCRIPTOR_TX_UNDERFLOWERR_MASK)
            {
                /* Transmit under flow error. */
                eErrorStatic->statsTxUnderFlowErr++;
            }
            if (controlExt & ENET_BUFFDESCRIPTOR_TX_OVERFLOWERR_MASK)
            {
                /* Transmit over flow error. */
                eErrorStatic->statsTxOverFlowErr++;
            }
            return kStatus_Success;
        }

    } while (handle->txBdDirtyStatic[ringId] != handle->txBdCurrent[ringId]);

    return kStatus_ENET_TxFrameFail;
}
#endif /* FSL_FEATURE_ENET_QUEUE > 1 */

static bool ENET_Ptp1588ParseFrame(const uint8_t *data, enet_ptp_time_data_t *ptpTsData, bool isFastEnabled)
{
    assert(data);
    if (!isFastEnabled)
    {
        assert(ptpTsData);
    }

    bool isPtpMsg = false;
    const uint8_t *buffer = data;
    uint16_t ptpType;

    /* Check for VLAN frame.
     * Add Double vlan tag check for receiving extended QIN vlan frame. */
    if (*(uint16_t *)(buffer + ENET_PTP1588_ETHL2_PACKETTYPE_OFFSET) == (ENET_HTONS(ENET_8021QVLAN)
#if defined(FSL_FEATUR_ENET_HAS_AVB) && FSL_FEATURE_HAS_AVB
                                                                         || ENET_HTONS(ENET_8021QSVLAN)
#endif /* FSL_FEATURE_ENET_HAS_AVB */
                                                                             ))
    {
        buffer += ENET_FRAME_VLAN_TAGLEN;
#if defined(FSL_FEATUR_ENET_HAS_AVB) && FSL_FEATURE_HAS_AVB
        if (*(uint16_t *)(buffer + ENET_PTP1588_ETHL2_PACKETTYPE_OFFSET) == ENET_HTONS(ENET_8021QVLAN)
        {
            buffer += ENET_FRAME_VLAN_TAGLEN;
        }
#endif /* FSL_FEATURE_ENET_HAS_AVB */
    }

    ptpType = *(uint16_t *)(buffer + ENET_PTP1588_ETHL2_PACKETTYPE_OFFSET);
    switch (ENET_HTONS(ptpType))
    { /* Ethernet layer 2. */
        case ENET_ETHERNETL2:
            if ((*(uint8_t *)(buffer + ENET_PTP1588_ETHL2_MSGTYPE_OFFSET) & 0x0F) <= kENET_PtpEventMsgType)
            {
                isPtpMsg = true;
                if (!isFastEnabled)
                {
                    /* It's a ptpv2 message and store the ptp header information. */
                    ptpTsData->version = (*(uint8_t *)(buffer + ENET_PTP1588_ETHL2_VERSION_OFFSET)) & 0x0F;
                    ptpTsData->messageType = (*(uint8_t *)(buffer + ENET_PTP1588_ETHL2_MSGTYPE_OFFSET)) & 0x0F;
                    ptpTsData->sequenceId = ENET_HTONS(*(uint16_t *)(buffer + ENET_PTP1588_ETHL2_SEQUENCEID_OFFSET));
                    memcpy((void *)&ptpTsData->sourcePortId[0], (void *)(buffer + ENET_PTP1588_ETHL2_CLOCKID_OFFSET),
                           kENET_PtpSrcPortIdLen);
                }
            }
            break;
        /* IPV4. */
        case ENET_IPV4:
            if ((*(uint8_t *)(buffer + ENET_PTP1588_IPVERSION_OFFSET) >> 4) == ENET_IPV4VERSION)
            {
                if (((*(uint16_t *)(buffer + ENET_PTP1588_IPV4_UDP_PORT_OFFSET)) == ENET_HTONS(kENET_PtpEventPort)) &&
                    (*(uint8_t *)(buffer + ENET_PTP1588_IPV4_UDP_PROTOCOL_OFFSET) == ENET_UDPVERSION))
                {
                    /* Set the PTP message flag. */
                    isPtpMsg = true;
                    if (!isFastEnabled)
                    {
                        /* It's a IPV4 ptp message and store the ptp header information. */
                        ptpTsData->version = (*(uint8_t *)(buffer + ENET_PTP1588_IPV4_UDP_VERSION_OFFSET)) & 0x0F;
                        ptpTsData->messageType = (*(uint8_t *)(buffer + ENET_PTP1588_IPV4_UDP_MSGTYPE_OFFSET)) & 0x0F;
                        ptpTsData->sequenceId =
                            ENET_HTONS(*(uint16_t *)(buffer + ENET_PTP1588_IPV4_UDP_SEQUENCEID_OFFSET));
                        memcpy((void *)&ptpTsData->sourcePortId[0],
                               (void *)(buffer + ENET_PTP1588_IPV4_UDP_CLKID_OFFSET), kENET_PtpSrcPortIdLen);
                    }
                }
            }
            break;
        /* IPV6. */
        case ENET_IPV6:
            if ((*(uint8_t *)(buffer + ENET_PTP1588_IPVERSION_OFFSET) >> 4) == ENET_IPV6VERSION)
            {
                if (((*(uint16_t *)(buffer + ENET_PTP1588_IPV6_UDP_PORT_OFFSET)) == ENET_HTONS(kENET_PtpEventPort)) &&
                    (*(uint8_t *)(buffer + ENET_PTP1588_IPV6_UDP_PROTOCOL_OFFSET) == ENET_UDPVERSION))
                {
                    /* Set the PTP message flag. */
                    isPtpMsg = true;
                    if (!isFastEnabled)
                    {
                        /* It's a IPV6 ptp message and store the ptp header information. */
                        ptpTsData->version = (*(uint8_t *)(buffer + ENET_PTP1588_IPV6_UDP_VERSION_OFFSET)) & 0x0F;
                        ptpTsData->messageType = (*(uint8_t *)(buffer + ENET_PTP1588_IPV6_UDP_MSGTYPE_OFFSET)) & 0x0F;
                        ptpTsData->sequenceId =
                            ENET_HTONS(*(uint16_t *)(buffer + ENET_PTP1588_IPV6_UDP_SEQUENCEID_OFFSET));
                        memcpy((void *)&ptpTsData->sourcePortId[0],
                               (void *)(buffer + ENET_PTP1588_IPV6_UDP_CLKID_OFFSET), kENET_PtpSrcPortIdLen);
                    }
                }
            }
            break;
        default:
            break;
    }
    return isPtpMsg;
}

/*!
 * brief Configures the ENET PTP IEEE 1588 feature with the basic configuration.
 * The function sets the clock for PTP 1588 timer and enables
 * time stamp interrupts and transmit interrupts for PTP 1588 features.
 * This API should be called when the 1588 feature is enabled
 * or the ENET_ENHANCEDBUFFERDESCRIPTOR_MODE is defined.
 * ENET_Init should be called before calling this API.
 *
 * note The PTP 1588 time-stamp second increase though time-stamp interrupt handler
 *  and the transmit time-stamp store is done through transmit interrupt handler.
 *  As a result, the TS interrupt and TX interrupt are enabled when you call this API.
 *
 * param base    ENET peripheral base address.
 * param handle  ENET handler pointer.
 * param ptpConfig The ENET PTP1588 configuration.
 */
void ENET_Ptp1588Configure(ENET_Type *base, enet_handle_t *handle, enet_ptp_config_t *ptpConfig)
{
    assert(handle);
    assert(ptpConfig);
    uint8_t count;

    uint32_t instance = ENET_GetInstance(base);
    uint32_t mask = kENET_TxBufferInterrupt;
#if FSL_FEATURE_ENET_QUEUE > 1
    mask |= kENET_TxBuffer1Interrupt | kENET_TxBuffer2Interrupt;
#endif /* FSL_FEATURE_ENET_QUEUE > 1 */

    /* Start the 1588 timer. */
    ENET_Ptp1588StartTimer(base, ptpConfig->ptp1588ClockSrc_Hz);

    for (count = 0; count < handle->ringNum; count++)
    {
        handle->txBdDirtyTime[count] = handle->txBdBase[count];
        handle->txBdDirtyStatic[count] = handle->txBdBase[count];
    }

    /* Setting the receive and transmit state for transaction. */
    handle->rxPtpTsDataRing.ptpTsData = ptpConfig->rxPtpTsData;
    handle->rxPtpTsDataRing.size = ptpConfig->ptpTsRxBuffNum;
    handle->rxPtpTsDataRing.front = 0;
    handle->rxPtpTsDataRing.end = 0;
    handle->txPtpTsDataRing.ptpTsData = ptpConfig->txPtpTsData;
    handle->txPtpTsDataRing.size = ptpConfig->ptpTsTxBuffNum;
    handle->txPtpTsDataRing.front = 0;
    handle->txPtpTsDataRing.end = 0;
    handle->msTimerSecond = 0;

    /* Set the IRQ handler when the interrupt is enabled. */
    s_enetTxIsr = ENET_TransmitIRQHandler;
    s_enetTsIsr = ENET_Ptp1588TimerIRQHandler;

    /* Enables the time stamp interrupt and transmit frame interrupt to
     * handle the time-stamp . */
    ENET_EnableInterrupts(base, (ENET_TS_INTERRUPT | ENET_TX_INTERRUPT));
    ENET_DisableInterrupts(base, mask);

    EnableIRQ(s_enetTsIrqId[instance]);
    EnableIRQ(s_enetTxIrqId[instance]);
}

/*!
 * brief Starts the ENET PTP 1588 Timer.
 * This function is used to initialize the PTP timer. After the PTP starts,
 * the PTP timer starts running.
 *
 * param base  ENET peripheral base address.
 * param ptpClkSrc The clock source of the PTP timer.
 */
void ENET_Ptp1588StartTimer(ENET_Type *base, uint32_t ptpClkSrc)
{
    /* Restart PTP 1588 timer, master clock. */
    base->ATCR = ENET_ATCR_RESTART_MASK;

    /* Initializes PTP 1588 timer. */
    base->ATINC = ENET_ATINC_INC(ENET_NANOSECOND_ONE_SECOND / ptpClkSrc);
    base->ATPER = ENET_NANOSECOND_ONE_SECOND;
    /* Sets periodical event and the event signal output assertion and Actives PTP 1588 timer.  */
    base->ATCR = ENET_ATCR_PEREN_MASK | ENET_ATCR_PINPER_MASK | ENET_ATCR_EN_MASK;
}

/*!
 * brief Gets the current ENET time from the PTP 1588 timer.
 *
 * param base  ENET peripheral base address.
 * param handle The ENET state pointer. This is the same state pointer used in the ENET_Init.
 * param ptpTime The PTP timer structure.
 */
void ENET_Ptp1588GetTimer(ENET_Type *base, enet_handle_t *handle, enet_ptp_time_t *ptpTime)
{
    assert(handle);
    assert(ptpTime);
    uint16_t count = ENET_1588TIME_DELAY_COUNT;
    uint32_t primask;

    /* Disables the interrupt. */
    primask = DisableGlobalIRQ();

    /* Get the current PTP time. */
    ptpTime->second = handle->msTimerSecond;
    /* Get the nanosecond from the master timer. */
    base->ATCR |= ENET_ATCR_CAPTURE_MASK;
    /* Add at least six clock cycle delay to get accurate time.
       It's the requirement when the 1588 clock source is slower
       than the register clock.
    */
    while (count--)
    {
        __NOP();
    }
    /* Get the captured time. */
    ptpTime->nanosecond = base->ATVR;

    /* Enables the interrupt. */
    EnableGlobalIRQ(primask);
}

/*!
 * brief Sets the ENET PTP 1588 timer to the assigned time.
 *
 * param base  ENET peripheral base address.
 * param handle The ENET state pointer. This is the same state pointer used in the ENET_Init.
 * param ptpTime The timer to be set to the PTP timer.
 */
void ENET_Ptp1588SetTimer(ENET_Type *base, enet_handle_t *handle, enet_ptp_time_t *ptpTime)
{
    assert(handle);
    assert(ptpTime);

    uint32_t primask;

    /* Disables the interrupt. */
    primask = DisableGlobalIRQ();

    /* Sets PTP timer. */
    handle->msTimerSecond = ptpTime->second;
    base->ATVR = ptpTime->nanosecond;

    /* Enables the interrupt. */
    EnableGlobalIRQ(primask);
}

/*!
 * brief Adjusts the ENET PTP 1588 timer.
 *
 * param base  ENET peripheral base address.
 * param corrIncrease The correction increment value. This value is added every time the correction
 *       timer expires. A value less than the PTP timer frequency(1/ptpClkSrc) slows down the timer,
 *        a value greater than the 1/ptpClkSrc speeds up the timer.
 * param corrPeriod The PTP timer correction counter wrap-around value. This defines after how
 *       many timer clock the correction counter should be reset and trigger a correction
 *       increment on the timer. A value of 0 disables the correction counter and no correction occurs.
 */
void ENET_Ptp1588AdjustTimer(ENET_Type *base, uint32_t corrIncrease, uint32_t corrPeriod)
{
    /* Set correction for PTP timer increment. */
    base->ATINC = (base->ATINC & ~ENET_ATINC_INC_CORR_MASK) | (corrIncrease << ENET_ATINC_INC_CORR_SHIFT);
    /* Set correction for PTP timer period. */
    base->ATCOR = (base->ATCOR & ~ENET_ATCOR_COR_MASK) | (corrPeriod << ENET_ATCOR_COR_SHIFT);
}

static status_t ENET_Ptp1588UpdateTimeRing(enet_ptp_time_data_ring_t *ptpTsDataRing, enet_ptp_time_data_t *ptpTimeData)
{
    assert(ptpTsDataRing);
    assert(ptpTsDataRing->ptpTsData);
    assert(ptpTimeData);

    uint16_t usedBuffer = 0;

    /* Check if the buffers ring is full. */
    if (ptpTsDataRing->end >= ptpTsDataRing->front)
    {
        usedBuffer = ptpTsDataRing->end - ptpTsDataRing->front;
    }
    else
    {
        usedBuffer = ptpTsDataRing->size - (ptpTsDataRing->front - ptpTsDataRing->end);
    }

    if (usedBuffer == ptpTsDataRing->size)
    {
        return kStatus_ENET_PtpTsRingFull;
    }

    /* Copy the new data into the buffer. */
    memcpy((ptpTsDataRing->ptpTsData + ptpTsDataRing->end), ptpTimeData, sizeof(enet_ptp_time_data_t));

    /* Increase the buffer pointer to the next empty one. */
    ptpTsDataRing->end = (ptpTsDataRing->end + 1) % ptpTsDataRing->size;

    return kStatus_Success;
}

static status_t ENET_Ptp1588SearchTimeRing(enet_ptp_time_data_ring_t *ptpTsDataRing, enet_ptp_time_data_t *ptpTimedata)
{
    assert(ptpTsDataRing);
    assert(ptpTsDataRing->ptpTsData);
    assert(ptpTimedata);

    uint32_t index;
    uint32_t size;
    uint16_t usedBuffer = 0;

    /* Check the PTP 1588 timestamp ring. */
    if (ptpTsDataRing->front == ptpTsDataRing->end)
    {
        return kStatus_ENET_PtpTsRingEmpty;
    }

    /* Search the element in the ring buffer */
    index = ptpTsDataRing->front;
    size = ptpTsDataRing->size;
    while (index != ptpTsDataRing->end)
    {
        if (((ptpTsDataRing->ptpTsData + index)->sequenceId == ptpTimedata->sequenceId) &&
            (!memcmp(((void *)&(ptpTsDataRing->ptpTsData + index)->sourcePortId[0]),
                     (void *)&ptpTimedata->sourcePortId[0], kENET_PtpSrcPortIdLen)) &&
            ((ptpTsDataRing->ptpTsData + index)->version == ptpTimedata->version) &&
            ((ptpTsDataRing->ptpTsData + index)->messageType == ptpTimedata->messageType))
        {
            break;
        }

        /* Increase the ptp ring index. */
        index = (index + 1) % size;
    }

    if (index == ptpTsDataRing->end)
    {
        /* Check if buffers is full. */
        if (ptpTsDataRing->end >= ptpTsDataRing->front)
        {
            usedBuffer = ptpTsDataRing->end - ptpTsDataRing->front;
        }
        else
        {
            usedBuffer = ptpTsDataRing->size - (ptpTsDataRing->front - ptpTsDataRing->end);
        }

        if (usedBuffer == ptpTsDataRing->size)
        { /* Drop one in the front. */
            ptpTsDataRing->front = (ptpTsDataRing->front + 1) % size;
        }
        return kStatus_ENET_PtpTsRingFull;
    }

    /* Get the right timestamp of the required ptp messag. */
    ptpTimedata->timeStamp.second = (ptpTsDataRing->ptpTsData + index)->timeStamp.second;
    ptpTimedata->timeStamp.nanosecond = (ptpTsDataRing->ptpTsData + index)->timeStamp.nanosecond;

    /* Increase the index. */
    ptpTsDataRing->front = (ptpTsDataRing->front + 1) % size;

    return kStatus_Success;
}

static status_t ENET_StoreRxFrameTime(ENET_Type *base, enet_handle_t *handle, enet_ptp_time_data_t *ptpTimeData)
{
    assert(handle);
    assert(ptpTimeData);

    bool ptpTimerWrap = false;
    enet_ptp_time_t ptpTimer;
    uint32_t primask;

    /* Disables the interrupt. */
    primask = DisableGlobalIRQ();

    /* Get current PTP timer nanosecond value. */
    ENET_Ptp1588GetTimer(base, handle, &ptpTimer);

    /* Get PTP timer wrap event. */
    ptpTimerWrap = base->EIR & kENET_TsTimerInterrupt;

    /* Get transmit time stamp second. */
    if ((ptpTimer.nanosecond > ptpTimeData->timeStamp.nanosecond) ||
        ((ptpTimer.nanosecond < ptpTimeData->timeStamp.nanosecond) && ptpTimerWrap))
    {
        ptpTimeData->timeStamp.second = handle->msTimerSecond;
    }
    else
    {
        ptpTimeData->timeStamp.second = handle->msTimerSecond - 1;
    }
    /* Enable the interrupt. */
    EnableGlobalIRQ(primask);

    /* Store the timestamp to the receive time stamp ring. */
    /* Check if the buffers ring is full. */
    return ENET_Ptp1588UpdateTimeRing(&handle->rxPtpTsDataRing, ptpTimeData);
}

static status_t ENET_StoreTxFrameTime(ENET_Type *base, enet_handle_t *handle, uint32_t ringId)
{
    assert(handle);

    uint32_t primask;
    bool ptpTimerWrap;
    bool isPtpEventMessage = false;
    enet_ptp_time_data_t ptpTimeData;
    volatile enet_tx_bd_struct_t *curBuffDescrip = handle->txBdDirtyTime[ringId];
    uint32_t address;

    /* Get the control status data, If the buffer descriptor has not been processed break out. */
    if (curBuffDescrip->control & ENET_BUFFDESCRIPTOR_TX_READY_MASK)
    {
        return kStatus_ENET_TxFrameBusy;
    }

/* Parse the PTP message. */
#if defined(FSL_FEATURE_MEMORY_HAS_ADDRESS_OFFSET) && FSL_FEATURE_MEMORY_HAS_ADDRESS_OFFSET
    address = MEMORY_ConvertMemoryMapAddress((uint32_t)curBuffDescrip->buffer, kMEMORY_DMA2Local);
#else
    address = (uint32_t)curBuffDescrip->buffer;
#endif /* FSL_FEATURE_MEMORY_HAS_ADDRESS_OFFSET */
    isPtpEventMessage = ENET_Ptp1588ParseFrame((uint8_t *)address, &ptpTimeData, false);
    if (isPtpEventMessage)
    {
        /* Only store tx timestamp for ptp event message. */
        do
        {
            /* Increase current buffer descriptor to the next one. */
            if (handle->txBdDirtyTime[ringId]->control & ENET_BUFFDESCRIPTOR_TX_WRAP_MASK)
            {
                handle->txBdDirtyTime[ringId] = handle->txBdBase[ringId];
            }
            else
            {
                handle->txBdDirtyTime[ringId]++;
            }

            /* Do time stamp check on the last buffer descriptor of the frame. */
            if (curBuffDescrip->control & ENET_BUFFDESCRIPTOR_TX_LAST_MASK)
            {
                /* Disables the interrupt. */
                primask = DisableGlobalIRQ();

                /* Get current PTP timer nanosecond value. */
                ENET_Ptp1588GetTimer(base, handle, &ptpTimeData.timeStamp);

                /* Get PTP timer wrap event. */
                ptpTimerWrap = base->EIR & kENET_TsTimerInterrupt;

                /* Get transmit time stamp second. */
                if ((ptpTimeData.timeStamp.nanosecond > curBuffDescrip->timestamp) ||
                    ((ptpTimeData.timeStamp.nanosecond < curBuffDescrip->timestamp) && ptpTimerWrap))
                {
                    ptpTimeData.timeStamp.second = handle->msTimerSecond;
                }
                else
                {
                    ptpTimeData.timeStamp.second = handle->msTimerSecond - 1;
                }

                /* Save transmit time stamp nanosecond. */
                ptpTimeData.timeStamp.nanosecond = curBuffDescrip->timestamp;

                /* Enable the interrupt. */
                EnableGlobalIRQ(primask);

                /* Store the timestamp to the transmit timestamp ring. */
                return ENET_Ptp1588UpdateTimeRing(&handle->txPtpTsDataRing, &ptpTimeData);
            }

            /* Get the current transmit buffer descriptor. */
            curBuffDescrip = handle->txBdDirtyTime[ringId];

            /* Get the control status data, If the buffer descriptor has not been processed break out. */
            if (curBuffDescrip->control & ENET_BUFFDESCRIPTOR_TX_READY_MASK)
            {
                return kStatus_ENET_TxFrameBusy;
            }
        } while (handle->txBdDirtyTime[ringId] != handle->txBdCurrent[ringId]);
        return kStatus_ENET_TxFrameFail;
    }
    else
    {
        /* Only increase current buffer descriptor to the next one. */
        if (handle->txBdDirtyTime[ringId]->control & ENET_BUFFDESCRIPTOR_TX_WRAP_MASK)
        {
            handle->txBdDirtyTime[ringId] = handle->txBdBase[ringId];
        }
        else
        {
            handle->txBdDirtyTime[ringId]++;
        }
    }
    return kStatus_Success;
}

/*!
 * brief Gets the time stamp of the transmit frame.
 *
 * This function is used for PTP stack to get the timestamp captured by the ENET driver.
 *
 * param handle The ENET handler pointer.This is the same state pointer used in
 *        ENET_Init.
 * param ptpTimeData The special PTP timestamp data for search the receive timestamp.
 * retval kStatus_Success Get 1588 timestamp success.
 * retval kStatus_ENET_PtpTsRingEmpty 1588 timestamp ring empty.
 * retval kStatus_ENET_PtpTsRingFull 1588 timestamp ring full.
 */
status_t ENET_GetTxFrameTime(enet_handle_t *handle, enet_ptp_time_data_t *ptpTimeData)
{
    assert(handle);
    assert(ptpTimeData);

    return ENET_Ptp1588SearchTimeRing(&handle->txPtpTsDataRing, ptpTimeData);
}

/*!
 * brief Gets the time stamp of the received frame.
 *
 * This function is used for PTP stack to get the timestamp captured by the ENET driver.
 *
 * param handle The ENET handler pointer.This is the same state pointer used in
 *        ENET_Init.
 * param ptpTimeData The special PTP timestamp data for search the receive timestamp.
 * retval kStatus_Success Get 1588 timestamp success.
 * retval kStatus_ENET_PtpTsRingEmpty 1588 timestamp ring empty.
 * retval kStatus_ENET_PtpTsRingFull 1588 timestamp ring full.
 */
status_t ENET_GetRxFrameTime(enet_handle_t *handle, enet_ptp_time_data_t *ptpTimeData)
{
    assert(handle);
    assert(ptpTimeData);

    return ENET_Ptp1588SearchTimeRing(&handle->rxPtpTsDataRing, ptpTimeData);
}

#if defined(FSL_FEATURE_ENET_HAS_AVB) && FSL_FEATURE_ENET_HAS_AVB
/*!
 * brief Sets the ENET AVB feature.
 *
 * ENET AVB feature configuration, set the Receive classification match and transmit
 * bandwidth. This API is called when the AVB feature is required.
 *
 * Note: The AVB frames transmission scheme is credit-based tx scheme and it's only supported
 * with the Enhanced buffer descriptors. so the AVB configuration should only done with
 * Enhanced buffer descriptor. so when the AVB feature is required, please make sure the
 * the "ENET_ENHANCEDBUFFERDESCRIPTOR_MODE" is defined.
 *
 * param base ENET peripheral base address.
 * param handle ENET handler pointer.
 * param config The ENET AVB feature configuration structure.
 */
void ENET_AVBConfigure(ENET_Type *base, enet_handle_t *handle, const enet_avb_config_t *config)
{
    assert(config);

    uint8_t count = 0;

    for (count = 0; count < FSL_FEATURE_ENET_QUEUE - 1; count++)
    {
        /* Set the AVB receive ring classification match when the match is not 0. */
        if (config->rxClassifyMatch[count])
        {
            base->RCMR[count] = (config->rxClassifyMatch[count] & 0xFFFF) | ENET_RCMR_MATCHEN_MASK;
        }
        /* Set the dma controller for the extended ring. */
        base->DMACFG[count] |= ENET_DMACFG_IDLE_SLOPE(config->idleSlope[count]);
    }

    /* Shall use the credit-based scheme for avb. */
    base->QOS &= ~ENET_QOS_TX_SCHEME_MASK;
    base->QOS |= ENET_QOS_RX_FLUSH0_MASK;
}
#endif /* FSL_FETAURE_ENET_HAS_AVB */
#endif /* ENET_ENHANCEDBUFFERDESCRIPTOR_MODE */

#if FSL_FEATURE_ENET_QUEUE > 1
/*!
 * brief The transmit IRQ handler.
 *
 * param base  ENET peripheral base address.
 * param handle The ENET handler pointer.
 */
void ENET_TransmitIRQHandler(ENET_Type *base, enet_handle_t *handle, uint32_t ringId)
#else
/*!
 * brief The transmit IRQ handler.
 *
 * param base  ENET peripheral base address.
 * param handle The ENET handler pointer.
 */
void ENET_TransmitIRQHandler(ENET_Type *base, enet_handle_t *handle)
#endif /* FSL_FEATURE_ENET_QUEUE > 1 */
{
    assert(handle);
    uint32_t mask = kENET_TxBufferInterrupt | kENET_TxFrameInterrupt;
#if defined(ENET_ENHANCEDBUFFERDESCRIPTOR_MODE) || (FSL_FEATURE_ENET_QUEUE > 1)
    uint32_t index = 0;
#endif /* ENET_ENHANCEDBUFFERDESCRIPTORMODE  || (FSL_FEATURE_ENET_QUEUE > 1) */

/* Check if the transmit interrupt happen. */
#if FSL_FEATURE_ENET_QUEUE > 1
    switch (ringId)
    {
        case kENET_Ring1:
            mask = (kENET_TxFrame1Interrupt | kENET_TxBuffer1Interrupt);
            break;
        case kENET_Ring2:
            mask = (kENET_TxFrame2Interrupt | kENET_TxBuffer2Interrupt);
            break;
        default:
            break;
    }
    index = ringId;
#endif /* FSL_FEATURE_ENET_QUEUE > 1 */

    while (mask & base->EIR)
    {
#ifdef ENET_ENHANCEDBUFFERDESCRIPTOR_MODE
        if (base->EIR & kENET_TxFrameInterrupt)
        {
            /* Store the transmit timestamp from the buffer descriptor should be done here. */
            ENET_StoreTxFrameTime(base, handle, index);
        }
#endif /* ENET_ENHANCEDBUFFERDESCRIPTOR_MODE */

        /* Clear the transmit interrupt event. */
        base->EIR = mask;

        /* Callback function. */
        if (handle->callback)
        {
#if FSL_FEATURE_ENET_QUEUE > 1
            handle->callback(base, handle, index, kENET_TxEvent, handle->userData);
#else
            handle->callback(base, handle, kENET_TxEvent, handle->userData);
#endif /* FSL_FEATURE_ENET_QUEUE > 1 */
        }
    }
}

#if FSL_FEATURE_ENET_QUEUE > 1
/*!
 * brief The receive IRQ handler.
 *
 * param base  ENET peripheral base address.
 * param handle The ENET handler pointer.
 */
void ENET_ReceiveIRQHandler(ENET_Type *base, enet_handle_t *handle, uint32_t ringId)
#else
/*!
 * brief The receive IRQ handler.
 *
 * param base  ENET peripheral base address.
 * param handle The ENET handler pointer.
 */
void ENET_ReceiveIRQHandler(ENET_Type *base, enet_handle_t *handle)
#endif /* FSL_FEATURE_ENET_QUEUE > 1 */
{
    assert(handle);
    uint32_t mask = kENET_RxFrameInterrupt | kENET_RxBufferInterrupt;

/* Check if the receive interrupt happen. */
#if FSL_FEATURE_ENET_QUEUE > 1
    switch (ringId)
    {
        case kENET_Ring1:
            mask = (kENET_RxFrame1Interrupt | kENET_RxBuffer1Interrupt);
            break;
        case kENET_Ring2:
            mask = (kENET_RxFrame2Interrupt | kENET_RxBuffer2Interrupt);
            break;
        default:
            break;
    }
#endif /* FSL_FEATURE_ENET_QUEUE > 1 */

    while (mask & base->EIR)
    {
        /* Clear the transmit interrupt event. */
        base->EIR = mask;

        /* Callback function. */
        if (handle->callback)
        {
#if FSL_FEATURE_ENET_QUEUE > 1
            handle->callback(base, handle, ringId, kENET_RxEvent, handle->userData);
#else
            handle->callback(base, handle, kENET_RxEvent, handle->userData);
#endif /* FSL_FEATURE_ENET_QUEUE > 1 */
        }
    }
}

/*!
 * brief Some special IRQ handler including the error, mii, wakeup irq handler.
 *
 * param base  ENET peripheral base address.
 * param handle The ENET handler pointer.
 */
void ENET_ErrorIRQHandler(ENET_Type *base, enet_handle_t *handle)
{
    assert(handle);

    uint32_t errMask = kENET_BabrInterrupt | kENET_BabtInterrupt | kENET_EBusERInterrupt | kENET_PayloadRxInterrupt |
                       kENET_LateCollisionInterrupt | kENET_RetryLimitInterrupt | kENET_UnderrunInterrupt;

    /* Check if the error interrupt happen. */
    if (kENET_WakeupInterrupt & base->EIR)
    {
        /* Clear the wakeup interrupt. */
        base->EIR = kENET_WakeupInterrupt;
        /* wake up and enter the normal mode. */
        ENET_EnableSleepMode(base, false);
        /* Callback function. */
        if (handle->callback)
        {
#if FSL_FEATURE_ENET_QUEUE > 1
            handle->callback(base, handle, 0, kENET_WakeUpEvent, handle->userData);
#else
            handle->callback(base, handle, kENET_WakeUpEvent, handle->userData);
#endif /* FSL_FEATURE_ENET_QUEUE > 1 */
        }
    }
    else
    {
        /* Clear the error interrupt event status. */
        errMask &= base->EIR;
        base->EIR = errMask;
        /* Callback function. */
        if (handle->callback)
        {
#if FSL_FEATURE_ENET_QUEUE > 1
            handle->callback(base, handle, 0, kENET_ErrEvent, handle->userData);
#else
            handle->callback(base, handle, kENET_ErrEvent, handle->userData);
#endif /* FSL_FEATURE_ENET_QUEUE > 1 */
        }
    }
/* Add for ARM errata 838869, affects Cortex-M4, Cortex-M4F Store immediate overlapping
  exception return operation might vector to incorrect interrupt */
#if defined __CORTEX_M && (__CORTEX_M == 4U)
    __DSB();
#endif
}

#ifdef ENET_ENHANCEDBUFFERDESCRIPTOR_MODE
/*!
 * brief The IEEE 1588 PTP time stamp interrupt handler.
 *
 * param base  ENET peripheral base address.
 * param handle The ENET state pointer. This is the same state pointer used in the ENET_Init.
 */
void ENET_Ptp1588TimerIRQHandler(ENET_Type *base, enet_handle_t *handle)
{
    assert(handle);

    /* Check if the PTP time stamp interrupt happen. */
    if (kENET_TsTimerInterrupt & base->EIR)
    {
        /* Clear the time stamp interrupt. */
        base->EIR = kENET_TsTimerInterrupt;

        /* Increase timer second counter. */
        handle->msTimerSecond++;

        /* Callback function. */
        if (handle->callback)
        {
#if FSL_FEATURE_ENET_QUEUE > 1
            handle->callback(base, handle, 0, kENET_TimeStampEvent, handle->userData);
#else
            handle->callback(base, handle, kENET_TimeStampEvent, handle->userData);
#endif /* FSL_FEATURE_ENET_QUEUE > 1 */
        }
    }
    else
    {
        /* Clear the time stamp interrupt. */
        base->EIR = kENET_TsAvailInterrupt;
        /* Callback function. */
        if (handle->callback)
        {
#if FSL_FEATURE_ENET_QUEUE > 1
            handle->callback(base, handle, 0, kENET_TimeStampAvailEvent, handle->userData);
#else
            handle->callback(base, handle, kENET_TimeStampAvailEvent, handle->userData);
#endif /* FSL_FEATURE_ENET_QUEUE > 1 */
        }
    }
/* Add for ARM errata 838869, affects Cortex-M4, Cortex-M4F Store immediate overlapping
  exception return operation might vector to incorrect interrupt */
#if defined __CORTEX_M && (__CORTEX_M == 4U)
    __DSB();
#endif
}
#endif /* ENET_ENHANCEDBUFFERDESCRIPTOR_MODE */

/*!
 * brief the common IRQ handler for the tx/rx/error etc irq handler.
 *
 * This is used for the combined tx/rx/error interrupt for single/mutli-ring (frame 0).
 *
 * param base  ENET peripheral base address.
 */
void ENET_CommonFrame0IRQHandler(ENET_Type *base)
{
    uint32_t event = base->EIR;
    uint32_t instance = ENET_GetInstance(base);

    if (event & (kENET_TxBufferInterrupt | kENET_TxFrameInterrupt))
    {
#if FSL_FEATURE_ENET_QUEUE > 1
        s_enetTxIsr(base, s_ENETHandle[instance], 0);
#else
        s_enetTxIsr(base, s_ENETHandle[instance]);
#endif /* FSL_FEATURE_ENET_QUEUE > 1 */
    }

    if (event & (kENET_RxBufferInterrupt | kENET_RxFrameInterrupt))
    {
#if FSL_FEATURE_ENET_QUEUE > 1
        s_enetRxIsr(base, s_ENETHandle[instance], 0);
#else
        s_enetRxIsr(base, s_ENETHandle[instance]);
#endif /* FSL_FEATURE_ENET_QUEUE > 1 */
    }

    if (event & ENET_TS_INTERRUPT)
    {
        s_enetTsIsr(base, s_ENETHandle[instance]);
    }
    if (event & ENET_ERR_INTERRUPT)
    {
        s_enetErrIsr(base, s_ENETHandle[instance]);
    }
/* Add for ARM errata 838869, affects Cortex-M4, Cortex-M4F Store immediate overlapping
  exception return operation might vector to incorrect interrupt */
#if defined __CORTEX_M && (__CORTEX_M == 4U)
    __DSB();
#endif
}

#if FSL_FEATURE_ENET_QUEUE > 1
/*!
 * brief the common IRQ handler for the tx/rx irq handler.
 *
 * This is used for the combined tx/rx interrupt for multi-ring (frame 1).
 *
 * param base  ENET peripheral base address.
 */
void ENET_CommonFrame1IRQHandler(ENET_Type *base)
{
    uint32_t event = base->EIR;
    uint32_t instance = ENET_GetInstance(base);

    if (event & (kENET_TxBuffer1Interrupt | kENET_TxFrame1Interrupt))
    {
        s_enetTxIsr(base, s_ENETHandle[instance], 1);
    }

    if (event & (kENET_RxBuffer1Interrupt | kENET_RxFrame1Interrupt))
    {
        s_enetRxIsr(base, s_ENETHandle[instance], 1);
    }
/* Add for ARM errata 838869, affects Cortex-M4, Cortex-M4F Store immediate overlapping
  exception return operation might vector to incorrect interrupt */
#if defined __CORTEX_M && (__CORTEX_M == 4U)
    __DSB();
#endif
}

/*!
 * brief the common IRQ handler for the tx/rx irq handler.
 *
 * This is used for the combined tx/rx interrupt for multi-ring (frame 2).
 *
 * param base  ENET peripheral base address.
 */
void ENET_CommonFrame2IRQHandler(ENET_Type *base)
{
    uint32_t event = base->EIR;
    uint32_t instance = ENET_GetInstance(base);

    if (event & (kENET_TxBuffer2Interrupt | kENET_TxFrame2Interrupt))
    {
        s_enetTxIsr(base, s_ENETHandle[instance], 2);
    }

    if (event & (kENET_RxBuffer2Interrupt | kENET_RxFrame2Interrupt))
    {
        s_enetRxIsr(base, s_ENETHandle[instance], 2);
    }
/* Add for ARM errata 838869, affects Cortex-M4, Cortex-M4F Store immediate overlapping
  exception return operation might vector to incorrect interrupt */
#if defined __CORTEX_M && (__CORTEX_M == 4U)
    __DSB();
#endif
}
#endif /* FSL_FEATURE_ENET_QUEUE > 1 */

#if defined(ENET)
void ENET_Transmit_IRQHandler(void)
{
    s_enetTxIsr(ENET, s_ENETHandle[0]);
/* Add for ARM errata 838869, affects Cortex-M4, Cortex-M4F Store immediate overlapping
  exception return operation might vector to incorrect interrupt */
#if defined __CORTEX_M && (__CORTEX_M == 4U)
    __DSB();
#endif
}

void ENET_Receive_IRQHandler(void)
{
    s_enetRxIsr(ENET, s_ENETHandle[0]);
/* Add for ARM errata 838869, affects Cortex-M4, Cortex-M4F Store immediate overlapping
  exception return operation might vector to incorrect interrupt */
#if defined __CORTEX_M && (__CORTEX_M == 4U)
    __DSB();
#endif
}

void ENET_Error_IRQHandler(void)
{
    s_enetErrIsr(ENET, s_ENETHandle[0]);
/* Add for ARM errata 838869, affects Cortex-M4, Cortex-M4F Store immediate overlapping
  exception return operation might vector to incorrect interrupt */
#if defined __CORTEX_M && (__CORTEX_M == 4U)
    __DSB();
#endif
}

void ENET_1588_Timer_IRQHandler(void)
{
    s_enetTsIsr(ENET, s_ENETHandle[0]);
/* Add for ARM errata 838869, affects Cortex-M4, Cortex-M4F Store immediate overlapping
  exception return operation might vector to incorrect interrupt */
#if defined __CORTEX_M && (__CORTEX_M == 4U)
    __DSB();
#endif
}

void ENET_DriverIRQHandler(void)
{
    ENET_CommonFrame0IRQHandler(ENET);
/* Add for ARM errata 838869, affects Cortex-M4, Cortex-M4F Store immediate overlapping
  exception return operation might vector to incorrect interrupt */
#if defined __CORTEX_M && (__CORTEX_M == 4U)
    __DSB();
#endif
/* Add for ARM errata 838869, affects Cortex-M4, Cortex-M4F Store immediate overlapping
  exception return operation might vector to incorrect interrupt */
#if defined __CORTEX_M && (__CORTEX_M == 4U)
    __DSB();
#endif
}

#endif

#if defined(ENET1)
void ENET1_DriverIRQHandler(void)
{
    ENET_CommonFrame0IRQHandler(ENET1);
/* Add for ARM errata 838869, affects Cortex-M4, Cortex-M4F Store immediate overlapping
  exception return operation might vector to incorrect interrupt */
#if defined __CORTEX_M && (__CORTEX_M == 4U)
    __DSB();
#endif
}
#endif

#if defined(ENET2)
void ENET2_DriverIRQHandler(void)
{
    ENET_CommonFrame0IRQHandler(ENET2);
/* Add for ARM errata 838869, affects Cortex-M4, Cortex-M4F Store immediate overlapping
  exception return operation might vector to incorrect interrupt */
#if defined __CORTEX_M && (__CORTEX_M == 4U)
    __DSB();
#endif
}
#endif

#if defined(CONNECTIVITY__ENET0)
void CONNECTIVITY_ENET0_FRAME0_EVENT_INT_DriverIRQHandler(void)
{
    ENET_CommonFrame0IRQHandler(CONNECTIVITY__ENET0);
/* Add for ARM errata 838869, affects Cortex-M4, Cortex-M4F Store immediate overlapping
  exception return operation might vector to incorrect interrupt */
#if defined __CORTEX_M && (__CORTEX_M == 4U)
    __DSB();
#endif
}
#if FSL_FEATURE_ENET_QUEUE > 1
void CONNECTIVITY_ENET0_FRAME1_INT_DriverIRQHandler(void)
{
    ENET_CommonFrame1IRQHandler(CONNECTIVITY__ENET0);
/* Add for ARM errata 838869, affects Cortex-M4, Cortex-M4F Store immediate overlapping
  exception return operation might vector to incorrect interrupt */
#if defined __CORTEX_M && (__CORTEX_M == 4U)
    __DSB();
#endif
}
void CONNECTIVITY_ENET0_FRAME2_INT_DriverIRQHandler(void)
{
    ENET_CommonFrame2IRQHandler(CONNECTIVITY__ENET0);
/* Add for ARM errata 838869, affects Cortex-M4, Cortex-M4F Store immediate overlapping
  exception return operation might vector to incorrect interrupt */
#if defined __CORTEX_M && (__CORTEX_M == 4U)
    __DSB();
#endif
}
#endif
#endif
#if defined(CONNECTIVITY__ENET1)
void CONNECTIVITY_ENET1_FRAME0_EVENT_INT_DriverIRQHandler(void)
{
    ENET_CommonFrame0IRQHandler(CONNECTIVITY__ENET1);
/* Add for ARM errata 838869, affects Cortex-M4, Cortex-M4F Store immediate overlapping
  exception return operation might vector to incorrect interrupt */
#if defined __CORTEX_M && (__CORTEX_M == 4U)
    __DSB();
#endif
}
#if FSL_FEATURE_ENET_QUEUE > 1
void CONNECTIVITY_ENET1_FRAME1_INT_DriverIRQHandler(void)
{
    ENET_CommonFrame1IRQHandler(CONNECTIVITY__ENET1);
/* Add for ARM errata 838869, affects Cortex-M4, Cortex-M4F Store immediate overlapping
  exception return operation might vector to incorrect interrupt */
#if defined __CORTEX_M && (__CORTEX_M == 4U)
    __DSB();
#endif
}
void CONNECTIVITY_ENET1_FRAME2_INT_DriverIRQHandler(void)
{
    ENET_CommonFrame2IRQHandler(CONNECTIVITY__ENET1);
/* Add for ARM errata 838869, affects Cortex-M4, Cortex-M4F Store immediate overlapping
  exception return operation might vector to incorrect interrupt */
#if defined __CORTEX_M && (__CORTEX_M == 4U)
    __DSB();
#endif
}
#endif
#endif