USB DFU (Device Firmware Upgrade) firmware for Atmel SAM devices supported by ASF4
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osmo-asf4-dfu/usb/usb_protocol.c

161 lines
4.2 KiB

/**
* \file
*
* \brief USB protocol implementation.
*
* This file contains the USB definitions and data structures provided by the
* USB 2.0 specification.
*
* Copyright (c) 2015-2018 Microchip Technology Inc. and its subsidiaries.
*
* \asf_license_start
*
* \page License
*
* Subject to your compliance with these terms, you may use Microchip
* software and any derivatives exclusively with Microchip products.
* It is your responsibility to comply with third party license terms applicable
* to your use of third party software (including open source software) that
* may accompany Microchip software.
*
* THIS SOFTWARE IS SUPPLIED BY MICROCHIP "AS IS". NO WARRANTIES,
* WHETHER EXPRESS, IMPLIED OR STATUTORY, APPLY TO THIS SOFTWARE,
* INCLUDING ANY IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY,
* AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT WILL MICROCHIP BE
* LIABLE FOR ANY INDIRECT, SPECIAL, PUNITIVE, INCIDENTAL OR CONSEQUENTIAL
* LOSS, DAMAGE, COST OR EXPENSE OF ANY KIND WHATSOEVER RELATED TO THE
* SOFTWARE, HOWEVER CAUSED, EVEN IF MICROCHIP HAS BEEN ADVISED OF THE
* POSSIBILITY OR THE DAMAGES ARE FORESEEABLE. TO THE FULLEST EXTENT
* ALLOWED BY LAW, MICROCHIP'S TOTAL LIABILITY ON ALL CLAIMS IN ANY WAY
* RELATED TO THIS SOFTWARE WILL NOT EXCEED THE AMOUNT OF FEES, IF ANY,
* THAT YOU HAVE PAID DIRECTLY TO MICROCHIP FOR THIS SOFTWARE.
*
* \asf_license_stop
*/
#define CONF_NO_ASSERT_CHECK
#include "usb_protocol.h"
#ifdef CONF_NO_ASSERT_CHECK
#define _param_error_check(cond)
#define _desc_len_check() \
if (usb_desc_len(desc) < 2) { \
/* Encounter an invalid descriptor. */ \
return NULL; \
}
#else
#define _param_error_check(cond) ASSERT(cond)
#define _desc_len_check() ASSERT(usb_desc_len(desc) >= 2)
#endif
uint8_t *usb_find_desc(uint8_t *desc, uint8_t *eof, uint8_t type)
{
_param_error_check(desc && eof && (desc < eof));
while (desc < eof) {
_desc_len_check();
if (type == usb_desc_type(desc)) {
return desc;
}
desc = usb_desc_next(desc);
}
return NULL;
}
uint8_t *usb_find_iface_after(uint8_t *desc, uint8_t *eof, uint8_t iface_n)
{
_param_error_check(desc && eof && (desc < eof));
while (desc < eof) {
_desc_len_check();
if (USB_DT_INTERFACE == usb_desc_type(desc)) {
if (iface_n != desc[2]) {
return desc;
}
}
desc = usb_desc_next(desc);
}
return eof;
}
uint8_t *usb_find_ep_desc(uint8_t *desc, uint8_t *eof)
{
_param_error_check(desc && eof && (desc < eof));
while (desc < eof) {
_desc_len_check();
if (USB_DT_INTERFACE == usb_desc_type(desc)) {
break;
}
if (USB_DT_ENDPOINT == usb_desc_type(desc)) {
return desc;
}
desc = usb_desc_next(desc);
}
return NULL;
}
uint8_t *usb_find_cfg_desc(uint8_t *desc, uint8_t *eof, uint8_t cfg_value)
{
_param_error_check(desc && eof && (desc < eof));
desc = usb_find_desc(desc, eof, USB_DT_CONFIG);
if (!desc) {
return NULL;
}
while (desc < eof) {
_desc_len_check();
if (desc[1] != USB_DT_CONFIG) {
break;
}
if (desc[5] == cfg_value) {
return desc;
}
desc = usb_cfg_desc_next(desc);
}
return NULL;
}
uint8_t *usb_find_othspdcfg_desc(uint8_t *desc, uint8_t *eof, uint8_t cfg_value)
{
_param_error_check(desc && eof && (desc < eof));
desc = usb_find_desc(desc, eof, USB_DT_OTHER_SPEED_CONFIG);
if (!desc) {
return NULL;
}
while (desc < eof) {
_desc_len_check();
if (desc[1] != USB_DT_OTHER_SPEED_CONFIG) {
break;
}
if (desc[5] == cfg_value) {
return desc;
}
desc = usb_cfg_desc_next(desc);
}
return NULL;
}
uint8_t *usb_find_str_desc(uint8_t *desc, uint8_t *eof, uint8_t str_index)
{
uint8_t i;
_param_error_check(desc && eof && (desc < eof));
for (i = 0; desc < eof;) {
desc = usb_find_desc(desc, eof, USB_DT_STRING);
if (desc) {
_desc_len_check();
if (i == str_index) {
return desc;
}
i++;
desc = usb_desc_next(desc);
} else {
return NULL;
}
}
return NULL;
}