Posted on June 23, 2015 at 10:16
I made my own bootloader for an STM32L1 board. My algorithm is simple : - first, I erase the memory I need to write my new program on my flash. - then, I write 4 bytes per 4 bytes my new program ( I receive it from the USART of the board)
- then i push the RESET button of my card, and nothing happens ...
My new program should blink a LED but nothing happens and I d'ont understand why ...
Do i have to write my own RESET function? Here is my code if you want to give a try.
void BootLoader(void) {
//clear all ITs
USART_ITConfig_boot( USART1, USART_IT_RXNE, 0);
uint32_t start_adr, end_adr;
uint8_t status, i;
uint8_t buffer[4096];
uint8_t sizeRcv[2];
uint16_t tailleSector = 0x1000;
uint32_t adr;
uint8_t nbSector = 0;
//size fixée en dur
uint16_t k = 0;
uint8_t size1 = 0;
uint8_t size2 = 0;
uint16_t sizeBin = 0;
//taille sector
uint16_t tailleSecteurDec = 4096;
SendString_boot(''BOOTLOADER ON.....\r\n'', USART2);
//adress
//First Sector
start_adr = WRITE_START_ADDR;
end_adr = start_adr + tailleSector;
//erasing flags
FLASH_ClearFlag_boot(
FLASH_FLAG_EOP | FLASH_FLAG_WRPERR | FLASH_FLAG_PGAERR
| FLASH_FLAG_SIZERR | FLASH_FLAG_OPTVERR
| FLASH_FLAG_OPTVERRUSR | FLASH_FLAG_RDERR);
FLASH_Unlock_boot();
sizeBin = 51400;
nbSector = (uint8_t) (sizeBin / tailleSecteurDec) + 1;
if(nbSector > 30){
SendString_boot(''cannot overrite memory : too much sectors used\r\n'',USART2);
}
for (i = 0; i <= (127 - 1); i++) {
if(end_adr <
0x0808FFFF
){
status
=
Flash_Erase
(start_adr, end_adr);
start_adr
=
end_adr
;
end_adr
= end_adr + tailleSector;
SendString_boot('' ERASING SECTOR DONE \r\n'', USART2);
}
else{
SendString_boot(''END OF FLASH MEMORY\r\n'', USART2);
}
}
SendString_boot(''ERASING COMPLETE\r\n'', USART2);
start_adr
=
WRITE_START_ADDR
;
//receive frames
adr
=
WRITE_START_ADDR
;
do {
SendString_boot(''ACK_READY'', USART1);
SendString_boot(''ACK_READY\r\n'', USART2);
//receive 32 bytes
if (sizeBin - k > 4096)
Receive_Data_boot(buffer, 4096);
else
Receive_Data_boot(buffer, sizeBin - k);
//write 32 bytes in memory
if (sizeBin - k > 4096)
status = Flash_Write(adr, buffer, 4096);
else
status = Flash_Write(adr, buffer, sizeBin - k);
//on check si on ecrit bien au bon endroit
//increment cpt
k = k + 4096;
adr = adr + 0x1000;
i++;
//check CRC
//TODO
SendString_boot(''...FLASH DONE ON '', USART2);
SendString_boot(''\r\n'', USART2);
SendString_boot('' SECTOR DONE \r\n'', USART2);
} while (k < sizeBin);
SendString_boot(''END'', USART1);
SendString_boot(''ACK_END\r\n'', USART2);
FLASH_Lock_boot();
}
#stm32 #bootloader #c
