Hi,
I'm writing a bootloader for nrf51822 to be able to update the nRF51's firmware through SPI (data transferred via an STM32 retrieving the file through USB).
My idea is to place a very basic bootloader at @0x0 through 0x37FF, and the firmware starting at 0x3800 to 0x3FFFF.
I want to keep memory usage as low as possible and to have the possibility to upgrade softDevice later. That's why I don't want softdevice in the bootloader.
So I wrote a program with SPI slave communication working, and as long as I am debugging step by step erasing and programming are ok too. But I'm stuck here because the device crashes when I run the erasing procedure without breakpoints. No hint on the type of error, because Keil IDE is exiting debug mode when the problem sparks. I tryied to add a wait loop for 1,2,and even 10 seconds between each page erase, but the behaviour is the same.
It can be tested with just these few lines.
void nrf_nvmc_page_erase(uint32_t address) //function from nrf_nvmc.c
{
int i;
// Enable erase.
NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Een;
while (NRF_NVMC->READY == NVMC_READY_READY_Busy)
{
}
// Erase the page
NRF_NVMC->ERASEPAGE = address;
while (NRF_NVMC->READY == NVMC_READY_READY_Busy)
{
}
NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Ren;
while (NRF_NVMC->READY == NVMC_READY_READY_Busy)
{
}
}
#define FIRMWARE_START 0x3800
#define FIRMWARE_END 0x3FFFF
#define PAGE_SIZE 0x400
int main(void)
{
uint32_t addressToProg;
for(addressToProg=FIRMWARE_START;addressToProg<FIRMWARE_END;addressToProg+=PAGE_SIZE)
{
flash_page_erase(addressToProg); //if breakpoint is placed here, it's fine. If not, it crashes
}
}
Do you have any clue on the problem ? Am I doing anything wrong ? I'm pretty sure it's something stupid but I'm really running out of time so any help would be deeply appreciated.
