Reset or Reboot Reason

[Justin]

I am using nrf52832, softdevice S112 and SDK 17.1.0. I am running the peripheral ble_uart example continuously with the central device sending connects and disconnects in loop.

I see that after a while the peripheral resets/reboots. After the reset when I read NRF_POWER->RESETREAS the value is 0x10004 (Soft Reset Detected).

What does this reset reason mean? How can I debug the root cause of this reset?

[Kazi Afroza Sultana]

Hello Justin,

You can build debug configuration, then put a breakpoint in the error handler to read out the error info (error code + filename/line number). This is also output on the logger if this is enables, when debug flag is set. 

Thanks.

Best Regards,

Kazi Afroza Sultana

[Justin]

I did try building with debug configuration.

I am using iar compiler and have breakpoint in app_error_handler() in app_error_handler_iar.c file. 

I see that the breakpoint is not getting hit before the reset/reboots. Is there any other place I can check for the possible reason for reboot?

[Justin]

Kazi Afroza Sultana Can you please look into this?

[Kazi Afroza Sultana]

You should search the project for calls to NVIC_SystemReset(). if you do not have this, you an use the error handler what I said in my previous reply. 

You can apply the following code after any reset (https://infocenter.nordicsemi.com/topic/errata_nRF52832_Rev3/ERR/nRF52832/Rev3/latest/anomaly_832_136.html?cp=4_2_1_0_1_34 )

if (NRF_POWER->RESETREAS & POWER_RESETREAS_RESETPIN_Msk){
    NRF_POWER->RESETREAS =  ~POWER_RESETREAS_RESETPIN_Msk;
}

[Justin]

Hi Kazi Afroza Sultana,

Thank you for looking to this.

I did put a breakpoints for calls to NVIC_SystemReset() and observed that during every reboot/reset I am ending up in 

#if defined (CONFIG_GPIO_AS_PINRESET)
 if (((NRF_UICR->PSELRESET[0] & UICR_PSELRESET_CONNECT_Msk) !=              (UICR_PSELRESET_CONNECT_Connected << UICR_PSELRESET_CONNECT_Pos)) ||
((NRF_UICR->PSELRESET[1] & UICR_PSELRESET_CONNECT_Msk) != (UICR_PSELRESET_CONNECT_Connected << UICR_PSELRESET_CONNECT_Pos))){
nvmc_config(NVMC_CONFIG_WEN_Wen);
NRF_UICR->PSELRESET[0] = RESET_PIN;
nvmc_wait();
NRF_UICR->PSELRESET[1] = RESET_PIN;
nvmc_wait();
nvmc_config(NVMC_CONFIG_WEN_Ren);
NVIC_SystemReset();
}
#endif

 This is in SystemInit() function and gets called during startup.

Can you please help me in debugging the reason for the system reset?