How to do the log mechanism whenever wdt or hard fault happens in NRF52832?

[Cheng]

Hi

My application with SDK11 S132 softdevice is having some unknown issues that will make wdt or hard fault handler happen. And I am trying to use the following code to access the flash memory in wdt

sd_flash_page_erase( page_num ); nrf_delay_ms(50); sd_flash_write( calib_addr, program_word, 25 ); nrf_delay_ms(50);

but it jumps to hard fault handler. How can I implement the mechanism even in hard fault, wdt, bus fault handler to store some important indicators in the flash so that I can still get the information in the next boot up?

[RK]

You can't use the softdevice sd_ functions. You're already in a handler, the chip can't make a SVC call. At this point you should only use direct calls into the NVIC to clear a page and write the data you want.

[Cheng]

Hi RK, Do you have any example for it? I am quite rookie to arm based architecture or any example provided in SDK11?

[Cheng]

I tried to access the NVMC register with the following codes in WDT_handler, but it failed. The same code works fine in main thread. Did I miss anything?

static void flash_page_erase(uint32_t * page_address){
// Turn on flash erase enable and wait until the NVMC is ready:
NRF_NVMC->CONFIG = (NVMC_CONFIG_WEN_Een << NVMC_CONFIG_WEN_Pos);

while (NRF_NVMC->READY == NVMC_READY_READY_Busy)
{
    // Do nothing.
}

// Erase page:
NRF_NVMC->ERASEPAGE = (uint32_t)page_address;

while (NRF_NVMC->READY == NVMC_READY_READY_Busy)
{
    // Do nothing.
}

// Turn off flash erase enable and wait until the NVMC is ready:
NRF_NVMC->CONFIG = (NVMC_CONFIG_WEN_Ren << NVMC_CONFIG_WEN_Pos);

while (NRF_NVMC->READY == NVMC_READY_READY_Busy)
{
    // Do nothing.
}

}

static void flash_word_write(uint32_t * address, uint32_t value)
{
// Turn on flash write enable and wait until the NVMC is ready:
NRF_NVMC->CONFIG = (NVMC_CONFIG_WEN_Wen << NVMC_CONFIG_WEN_Pos);

while (NRF_NVMC->READY == NVMC_READY_READY_Busy)
{
    // Do nothing.
}

*address = value;

while (NRF_NVMC->READY == NVMC_READY_READY_Busy)
{
    // Do nothing.
}

// Turn off flash write enable and wait until the NVMC is ready:
NRF_NVMC->CONFIG = (NVMC_CONFIG_WEN_Ren << NVMC_CONFIG_WEN_Pos);

while (NRF_NVMC->READY == NVMC_READY_READY_Busy)
{
    // Do nothing.
}

}

[MartinBL]

How does it fail? Hard faults? Have you debugged and set breakpoints in your functions to pinpoint where things fail?

[Cheng]

It failed at NRF_NVMC->CONFIG = (NVMC_CONFIG_WEN_Een << NVMC_CONFIG_WEN_Pos); at the beginning of flash_page_erase. I also put the breakpoint in the hard fault handler but system did not get there. It seems like that I cannot access NVMC register in the WDT_handler. Any idea? Thanks!!!