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/*
* dfu.c
* ------------
* Receive new firmware from MGMT UART and write it to STM32 internal flash.
*
* Copyright (c) 2016, NORDUnet A/S All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* - Neither the name of the NORDUnet nor the names of its contributors may
* be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "dfu.h"
#include "stm-led.h"
#include "stm-uart.h"
#include "stm-flash.h"
#include <string.h>
extern uint32_t update_crc(uint32_t crc, uint8_t *buf, int len);
int dfu_receive_firmware(void)
{
uint32_t filesize = 0, crc = 0, my_crc = 0, counter = 0;
uint32_t offset = DFU_FIRMWARE_ADDR, n = DFU_UPLOAD_CHUNK_SIZE;
uint32_t buf[DFU_UPLOAD_CHUNK_SIZE / 4];
uart_send_string2(STM_UART_MGMT, (char *) "\r\nOK, bootloader waiting for new firmware\r\n");
/* Read file size (4 bytes) */
uart_receive_bytes(STM_UART_MGMT, (void *) &filesize, 4, 1000);
if (filesize < 512 || filesize > DFU_FIRMWARE_END_ADDR - DFU_FIRMWARE_ADDR) {
return -1;
}
HAL_FLASH_Unlock();
while (filesize) {
/* By initializing buf to the same value that erased flash has (0xff), we don't
* have to try and be smart when writing the last page of data to the memory.
*/
memset(buf, 0xffffffff, sizeof(buf));
if (filesize < n) {
n = filesize;
}
if (uart_receive_bytes(STM_UART_MGMT, (void *) &buf, n, 1000) != HAL_OK) {
return -2;
}
filesize -= n;
/* After reception of a chunk but before ACKing we have "all" the time in the world to
* calculate CRC and write it to flash.
*/
my_crc = update_crc(my_crc, (uint8_t *) buf, n);
stm_flash_write32(offset, buf, sizeof(buf) / 4);
offset += DFU_UPLOAD_CHUNK_SIZE;
/* ACK this chunk by sending the current chunk counter (4 bytes) */
counter++;
uart_send_bytes(STM_UART_MGMT, (void *) &counter, 4);
led_toggle(LED_BLUE);
}
HAL_FLASH_Lock();
/* The sending side will now send it's calculated CRC-32 */
uart_receive_bytes(STM_UART_MGMT, (void *) &crc, 4, 1000);
if (crc == my_crc) {
uart_send_string2(STM_UART_MGMT, (char *) "\r\nSuccess\r\n");
return 0;
}
led_on(LED_RED);
led_on(LED_YELLOW);
/* Better to erase the known bad firmware */
stm_flash_erase_sectors(DFU_FIRMWARE_ADDR, DFU_FIRMWARE_END_ADDR);
led_off(LED_YELLOW);
return 0;
}
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