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* Copyright (c) 2016 Nordic Semiconductor ASA
* Copyright (c) 2015-2016 Intel Corporation
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <errno.h>
#include <stddef.h>
#include <stdio.h>
#include <string.h>
#include <zephyr.h>
#include <arch/cpu.h>
#include <misc/byteorder.h>
#include <logging/sys_log.h>
#include <misc/util.h>
#include <device.h>
#include <init.h>
#include <uart.h>
#include <net/buf.h>
#include <bluetooth/bluetooth.h>
#include <bluetooth/l2cap.h>
#include <bluetooth/log.h>
#include <bluetooth/hci.h>
#include <bluetooth/buf.h>
#include <bluetooth/hci_raw.h>
static struct device *hci_uart_dev;
static BT_STACK_NOINIT(tx_thread_stack, CONFIG_BLUETOOTH_HCI_TX_STACK_SIZE);
/* HCI command buffers */
#define CMD_BUF_SIZE BT_BUF_RX_SIZE
NET_BUF_POOL_DEFINE(cmd_tx_pool, CONFIG_BLUETOOTH_HCI_CMD_COUNT, CMD_BUF_SIZE,
BT_BUF_USER_DATA_MIN, NULL);
#define BT_L2CAP_MTU 65 /* 64-byte public key + opcode */
/** Data size needed for ACL buffers */
#define BT_BUF_ACL_SIZE BT_L2CAP_BUF_SIZE(BT_L2CAP_MTU)
#if defined(CONFIG_BLUETOOTH_CONTROLLER_TX_BUFFERS)
#define TX_BUF_COUNT CONFIG_BLUETOOTH_CONTROLLER_TX_BUFFERS
#else
#define TX_BUF_COUNT 6
#endif
NET_BUF_POOL_DEFINE(acl_tx_pool, TX_BUF_COUNT, BT_BUF_ACL_SIZE,
BT_BUF_USER_DATA_MIN, NULL);
static K_FIFO_DEFINE(tx_queue);
#define H4_CMD 0x01
#define H4_ACL 0x02
#define H4_SCO 0x03
#define H4_EVT 0x04
/* Length of a discard/flush buffer.
* This is sized to align with a BLE HCI packet:
* 1 byte H:4 header + 32 bytes ACL/event data
* Bigger values might overflow the stack since this is declared as a local
* variable, smaller ones will force the caller to call into discard more
* often.
*/
#define H4_DISCARD_LEN 33
static int h4_read(struct device *uart, uint8_t *buf,
size_t len, size_t min)
{
int total = 0;
while (len) {
int rx;
rx = uart_fifo_read(uart, buf, len);
if (rx == 0) {
SYS_LOG_DBG("Got zero bytes from UART");
if (total < min) {
continue;
}
break;
}
SYS_LOG_DBG("read %d remaining %d", rx, len - rx);
len -= rx;
total += rx;
buf += rx;
}
return total;
}
static size_t h4_discard(struct device *uart, size_t len)
{
uint8_t buf[H4_DISCARD_LEN];
return uart_fifo_read(uart, buf, min(len, sizeof(buf)));
}
static struct net_buf *h4_cmd_recv(int *remaining)
{
struct bt_hci_cmd_hdr hdr;
struct net_buf *buf;
/* We can ignore the return value since we pass len == min */
h4_read(hci_uart_dev, (void *)&hdr, sizeof(hdr), sizeof(hdr));
*remaining = hdr.param_len;
buf = net_buf_alloc(&cmd_tx_pool, K_NO_WAIT);
if (buf) {
bt_buf_set_type(buf, BT_BUF_CMD);
net_buf_add_mem(buf, &hdr, sizeof(hdr));
} else {
SYS_LOG_ERR("No available command buffers!");
}
SYS_LOG_DBG("len %u", hdr.param_len);
return buf;
}
static struct net_buf *h4_acl_recv(int *remaining)
{
struct bt_hci_acl_hdr hdr;
struct net_buf *buf;
/* We can ignore the return value since we pass len == min */
h4_read(hci_uart_dev, (void *)&hdr, sizeof(hdr), sizeof(hdr));
buf = net_buf_alloc(&acl_tx_pool, K_NO_WAIT);
if (buf) {
bt_buf_set_type(buf, BT_BUF_ACL_OUT);
net_buf_add_mem(buf, &hdr, sizeof(hdr));
} else {
SYS_LOG_ERR("No available ACL buffers!");
}
*remaining = sys_le16_to_cpu(hdr.len);
SYS_LOG_DBG("len %u", *remaining);
return buf;
}
static void bt_uart_isr(struct device *unused)
{
static struct net_buf *buf;
static int remaining;
ARG_UNUSED(unused);
while (uart_irq_update(hci_uart_dev) &&
uart_irq_is_pending(hci_uart_dev)) {
int read;
if (!uart_irq_rx_ready(hci_uart_dev)) {
if (uart_irq_tx_ready(hci_uart_dev)) {
SYS_LOG_DBG("transmit ready");
} else {
SYS_LOG_DBG("spurious interrupt");
}
/* Only the UART RX path is interrupt-enabled */
break;
}
/* Beginning of a new packet */
if (!remaining) {
uint8_t type;
/* Get packet type */
read = h4_read(hci_uart_dev, &type, sizeof(type), 0);
if (read != sizeof(type)) {
SYS_LOG_WRN("Unable to read H4 packet type");
continue;
}
switch (type) {
case H4_CMD:
buf = h4_cmd_recv(&remaining);
break;
case H4_ACL:
buf = h4_acl_recv(&remaining);
break;
default:
SYS_LOG_ERR("Unknown H4 type %u", type);
return;
}
SYS_LOG_DBG("need to get %u bytes", remaining);
if (buf && remaining > net_buf_tailroom(buf)) {
SYS_LOG_ERR("Not enough space in buffer");
net_buf_unref(buf);
buf = NULL;
}
}
if (!buf) {
read = h4_discard(hci_uart_dev, remaining);
SYS_LOG_WRN("Discarded %d bytes", read);
remaining -= read;
continue;
}
read = h4_read(hci_uart_dev, net_buf_tail(buf), remaining, 0);
buf->len += read;
remaining -= read;
SYS_LOG_DBG("received %d bytes", read);
if (!remaining) {
SYS_LOG_DBG("full packet received");
/* Put buffer into TX queue, thread will dequeue */
net_buf_put(&tx_queue, buf);
buf = NULL;
}
}
}
static void tx_thread(void *p1, void *p2, void *p3)
{
while (1) {
struct net_buf *buf;
/* Wait until a buffer is available */
buf = net_buf_get(&tx_queue, K_FOREVER);
/* Pass buffer to the stack */
bt_send(buf);
/* Give other threads a chance to run if tx_queue keeps getting
* new data all the time.
*/
k_yield();
}
}
static int h4_send(struct net_buf *buf)
{
SYS_LOG_DBG("buf %p type %u len %u", buf, bt_buf_get_type(buf),
buf->len);
switch (bt_buf_get_type(buf)) {
case BT_BUF_ACL_IN:
uart_poll_out(hci_uart_dev, H4_ACL);
break;
case BT_BUF_EVT:
uart_poll_out(hci_uart_dev, H4_EVT);
break;
default:
SYS_LOG_ERR("Unknown type %u", bt_buf_get_type(buf));
net_buf_unref(buf);
return -EINVAL;
}
while (buf->len) {
uart_poll_out(hci_uart_dev, net_buf_pull_u8(buf));
}
net_buf_unref(buf);
return 0;
}
#if defined(CONFIG_BLUETOOTH_CONTROLLER_ASSERT_HANDLER)
void bt_controller_assert_handle(char *file, uint32_t line)
{
uint32_t len = 0, pos = 0;
/* Disable interrupts, this is unrecoverable */
(void)irq_lock();
uart_irq_rx_disable(hci_uart_dev);
uart_irq_tx_disable(hci_uart_dev);
if (file) {
while (file[len] != '\0') {
if (file[len] == '/') {
pos = len + 1;
}
len++;
}
file += pos;
len -= pos;
}
uart_poll_out(hci_uart_dev, H4_EVT);
/* Vendor-Specific debug event */
uart_poll_out(hci_uart_dev, 0xff);
/* 0xAA + strlen + \0 + 32-bit line number */
uart_poll_out(hci_uart_dev, 1 + len + 1 + 4);
uart_poll_out(hci_uart_dev, 0xAA);
if (len) {
while (*file != '\0') {
uart_poll_out(hci_uart_dev, *file);
file++;
}
uart_poll_out(hci_uart_dev, 0x00);
}
uart_poll_out(hci_uart_dev, line >> 0 & 0xff);
uart_poll_out(hci_uart_dev, line >> 8 & 0xff);
uart_poll_out(hci_uart_dev, line >> 16 & 0xff);
uart_poll_out(hci_uart_dev, line >> 24 & 0xff);
while (1) {
}
}
#endif /* CONFIG_BLUETOOTH_CONTROLLER_ASSERT_HANDLER */
static int hci_uart_init(struct device *unused)
{
SYS_LOG_DBG("");
hci_uart_dev =
device_get_binding(CONFIG_BLUETOOTH_UART_TO_HOST_DEV_NAME);
if (!hci_uart_dev) {
return -EINVAL;
}
uart_irq_rx_disable(hci_uart_dev);
uart_irq_tx_disable(hci_uart_dev);
uart_irq_callback_set(hci_uart_dev, bt_uart_isr);
uart_irq_rx_enable(hci_uart_dev);
return 0;
}
DEVICE_INIT(hci_uart, "hci_uart", &hci_uart_init, NULL, NULL,
APPLICATION, CONFIG_KERNEL_INIT_PRIORITY_DEVICE);
void main(void)
{
/* incoming events and data from the controller */
static K_FIFO_DEFINE(rx_queue);
int err;
SYS_LOG_DBG("Start");
/* Enable the raw interface, this will in turn open the HCI driver */
bt_enable_raw(&rx_queue);
/* Spawn the TX thread and start feeding commands and data to the
* controller
*/
k_thread_spawn(tx_thread_stack, sizeof(tx_thread_stack), tx_thread,
NULL, NULL, NULL, K_PRIO_COOP(7), 0, K_NO_WAIT);
while (1) {
struct net_buf *buf;
buf = net_buf_get(&rx_queue, K_FOREVER);
err = h4_send(buf);
if (err) {
SYS_LOG_ERR("Failed to send");
}
}
}
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