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/*
* (C) 2018, sysmocom -s.f.m.c. GmbH, Author: Kevin Redon <kredon@sysmocom.de>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "atmel_start.h"
#include "usb_start.h"
#if CONF_USBD_HS_SP
static uint8_t single_desc_bytes[] = {
/* Device descriptors and Configuration descriptors list. */
DFUD_HS_DESCES_LS_FS};
static uint8_t single_desc_bytes_hs[] = {
/* Device descriptors and Configuration descriptors list. */
DFUD_HS_DESCES_HS};
#else
static uint8_t single_desc_bytes[] = {
/* Device descriptors and Configuration descriptors list. */
DFUD_DESCES_LS_FS};
#endif
static struct usbd_descriptors single_desc[]
= {{single_desc_bytes, single_desc_bytes + sizeof(single_desc_bytes)}
#if CONF_USBD_HS_SP
,
{single_desc_bytes_hs, single_desc_bytes_hs + sizeof(single_desc_bytes_hs)}
#endif
};
/** USB DFU functional descriptor (with DFU attributes) */
static const uint8_t usb_dfu_func_desc_bytes[] = {DFUD_IFACE_DESCB};
static const usb_dfu_func_desc_t* usb_dfu_func_desc = (usb_dfu_func_desc_t*)&usb_dfu_func_desc_bytes;
/** Ctrl endpoint buffer */
static uint8_t ctrl_buffer[64];
/**
* \brief USB DFU Init
*/
void usb_dfu_init(void)
{
usbdc_init(ctrl_buffer);
dfudf_init();
usbdc_start(single_desc);
usbdc_attach();
}
/**
* \brief reset device
*/
static void usb_dfu_reset(const enum usb_event ev, const uint32_t param)
{
(void)param; // not used
switch (ev) {
case USB_EV_RESET:
usbdc_detach(); // make sure we are detached
NVIC_SystemReset(); // initiate a system reset
break;
default:
break;
}
}
/**
* \brief Enter USB DFU runtime
*/
void usb_dfu(void)
{
while (!dfudf_is_enabled()); // wait for DFU to be installed
gpio_set_pin_level(LED_SYSTEM, false); // switch LED on to indicate USB DFU stack is ready
ASSERT(hri_nvmctrl_read_STATUS_BOOTPROT_bf(FLASH_0.dev.hw) <= 15);
uint32_t application_start_address = (15 - hri_nvmctrl_read_STATUS_BOOTPROT_bf(FLASH_0.dev.hw)) * 8192; // calculate bootloader size to know where we should write the application firmware
ASSERT(application_start_address > 0);
while (true) { // main DFU infinite loop
// run the second part of the USB DFU state machine handling non-USB aspects
if (USB_DFU_STATE_DFU_DNLOAD_SYNC == dfu_state || USB_DFU_STATE_DFU_DNBUSY == dfu_state) { // there is some data to be flashed
gpio_set_pin_level(LED_SYSTEM, true); // switch LED off to indicate we are flashing
if (dfu_download_length > 0) { // there is some data to be flashed
int32_t rc = flash_write(&FLASH_0, application_start_address + dfu_download_offset, dfu_download_data, dfu_download_length); // write downloaded data chunk to flash
if (ERR_NONE == rc) {
dfu_state = USB_DFU_STATE_DFU_DNLOAD_IDLE; // indicate flashing this block has been completed
} else { // there has been a programming error
dfu_state = USB_DFU_STATE_DFU_ERROR;
if (ERR_BAD_ADDRESS == rc) {
dfu_status = USB_DFU_STATUS_ERR_ADDRESS;
} else if (ERR_DENIED == rc) {
dfu_status = USB_DFU_STATUS_ERR_WRITE;
} else {
dfu_status = USB_DFU_STATUS_ERR_PROG;
}
}
} else { // there was no data to flash
// this case should not happen, but it's not a critical error
dfu_state = USB_DFU_STATE_DFU_DNLOAD_IDLE; // indicate flashing can continue
}
gpio_set_pin_level(LED_SYSTEM, false); // switch LED on to indicate USB DFU can resume
}
if (USB_DFU_STATE_DFU_MANIFEST == dfu_state) { // we can start manifestation (finish flashing)
// in theory every DFU files should have a suffix to with a CRC to check the data
// in practice most downloaded files are just the raw binary with DFU suffix
dfu_manifestation_complete = true; // we completed flashing and all checks
if (usb_dfu_func_desc->bmAttributes & USB_DFU_ATTRIBUTES_MANIFEST_TOLERANT) {
dfu_state = USB_DFU_STATE_DFU_MANIFEST_SYNC;
} else {
dfu_state = USB_DFU_STATE_DFU_MANIFEST_WAIT_RESET;
}
}
if (USB_DFU_STATE_DFU_MANIFEST_WAIT_RESET == dfu_state) {
if (usb_dfu_func_desc->bmAttributes & USB_DFU_ATTRIBUTES_WILL_DETACH) {
usb_dfu_reset(USB_EV_RESET, 0); // immediately reset
} else { // wait for USB reset
usb_d_register_callback(USB_D_CB_EVENT, (FUNC_PTR)usb_dfu_reset); // register new USB reset event handler
}
}
}
}
void usb_init(void)
{
usb_dfu_init();
}
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