Flash problem

[nordicxup]

I have a nrf52840DK and try to modify SDK peripheral/uart  example. I want to reboot nrf52840 device after getting uart communication errors. I put NVIC_SystemReset() function call to the wrong place that caused the device reboot continuously. The modification code is below. I cannot flash anymore by IDE tools or nRF Connect. Is there anyway to erase the flash or just throw it away?

void uart_error_handle(app_uart_evt_t * p_event)
{
  if (p_event->evt_type == APP_UART_COMMUNICATION_ERROR)
  {
    APP_ERROR_HANDLER(p_event->data.error_communication);
  }
  else if (p_event->evt_type == APP_UART_FIFO_ERROR)
  {
    APP_ERROR_HANDLER(p_event->data.error_code);
  }
  NVIC_SystemReset();
}

[Jørgen Holmefjord]

Hi,

Try using nrfjprog with the --recover option.

Best regards,
Jørgen

[Jørgen Holmefjord]

It could be related. How is the Raytac DK powered? Did you manage to flash it before? You have not added something in your code that will pull the reset pin low? If you did, you can try pulling the reset pin directly to VDD on the nRF52840 before running the recover command.

Another alternative to try is to run recover command in a loop, it may succeed on one of the calls.

[nordicxup]

Thanks a lot. Yes, it works after pulling the reset pin directly to VDD on the nRF52840 before running the recover command.