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/* usb_descriptor.h - header for common device descriptor */ /* * Copyright (c) 2017 PHYTEC Messtechnik GmbH * * SPDX-License-Identifier: Apache-2.0 */ #ifndef __USB_DESCRIPTOR_H__ #define __USB_DESCRIPTOR_H__ /* * The USB Unicode bString is encoded in UTF16LE, which means it takes up * twice the amount of bytes than the same string encoded in ASCII7. * Use this macro to determine the length of the bString array. * * bString length without null character: * bString_length = (sizeof(initializer_string) - 1) * 2 * or: * bString_length = sizeof(initializer_string) * 2 - 2 */ #define USB_BSTRING_LENGTH(s) (sizeof(s) * 2 - 2) /* * The length of the string descriptor (bLength) is calculated from the * size of the two octets bLength and bDescriptorType plus the * length of the UTF16LE string: * * bLength = 2 + bString_length * bLength = 2 + sizeof(initializer_string) * 2 - 2 * bLength = sizeof(initializer_string) * 2 * Use this macro to determine the bLength of the string descriptor. */ #define USB_STRING_DESCRIPTOR_LENGTH(s) (sizeof(s) * 2) /* Automatic endpoint assignment */ #define AUTO_EP_IN 0x80 #define AUTO_EP_OUT 0x00 /* Common part of device data */ struct usb_dev_data { struct device *dev; sys_snode_t node; }; struct usb_dev_data *usb_get_dev_data_by_cfg(sys_slist_t *list, struct usb_cfg_data *cfg); struct usb_dev_data *usb_get_dev_data_by_iface(sys_slist_t *list, u8_t iface_num); struct usb_dev_data *usb_get_dev_data_by_ep(sys_slist_t *list, u8_t ep); int usb_get_str_descriptor_idx(void *ptr); u8_t *usb_update_sn_string_descriptor(void); u8_t *usb_get_device_descriptor(void); #endif /* __USB_DESCRIPTOR_H__ */ |