How to always Write to FLASH

[BartoszT]

There is my function for writing to flash.

It works when NRF52832 start from reset, if works when the NRF52832 gets data over BLE but it does not works after "power down and up".

It is strange, CPU works on Super Capacitor when the main power fall down, but when power wakes up flash erase works when start after some delay (about 100ms).

Problem is with waiting for flash ready, cpu stucks there. In another one implementation of writing flash processor doesn't stuck but writing has no effect. 

NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Wen;
while (NRF_NVMC->READY == NVMC_READY_READY_Busy);  <<<<< HERE PROCESSOR STUCK

config_t* set_default_config(void)
{
  erase_config_flash();
  memset(&m_config.calendar,0x00, sizeof(m_config.calendar));
  m_config.mode=MODE_DEFAULT;
  m_config.button_mode=SHORT_MODE;
  m_config.calendar.RTCtime=1546300800; //  01-01-2019

  write_config_to_flash();
  return(&m_config);
}

[ketiljo]

Sounds like the supply voltage is being too low. Can you share the schematic? Do you have the correct value on all the decoupling capacitors?

[BartoszT]

Now im working witj DEV KIT nRF52. Previous problem disappeared.

Now FlashErase doesn't work each time I use it.

It means that at the beginning when the device starts, FlashErase works, but later during the work of the device no longer.

My code for erasing:

what is the cause of the problem?