NRF52832 Softreset

[Somesh Burkule]

Hello Everyone,

I am using nrf52832 and sdk 15.2 for BLE scanning and advertising. scanning and advertising is working parallel. this is controlled by other MCU over serial.

but there is random reset in nrf chip. when I tried to find out the reason using sd_power_reset_reason_get(&reset_reason), I got 0x00000004 ( i.e. softreset ).

I am not getting why there is softreset randomly(i.e. once in a hour ). Is it due to UART handler hang?

Please help me resolve the same.

One more question, Is there any chance to soft reset nrf in normal condition which may handled by softdevice?

[Kenneth]

I expect you have an assert, which by default will execute an NVIC_SystemReset() to recover. This is a good idea for a final product, however during prototype development you may want to add DEBUG to the preprocessor symbol such that you in can set a breakpoint to identify file name, line number and error code causing the assert, this is done in app_error_fault_handler().

[Somesh Burkule]

Hi Kenneth,

Thanks you for your quick response.

Actually I have commented assert callback in my code still getting softreset.

void assert_nrf_callback(uint16_t line_num, const uint8_t * p_file_name)
{
app_error_handler(0xDEADBEEF, line_num, p_file_name);
}

[Kenneth]

Is it possible to add some delay (e.g. ~us) between bytes from the peer?

Kenneth

[Somesh Burkule]

No, we can add in millisecond. but it will be quite complex right to send each byte and adding delay.

I have added wait 50 ms till  tx done.

[Kenneth]

Since you can't change the delay, and you can't use flow control, then I suggest to use libuarte:

https://infocenter.nordicsemi.com/topic/sdk_nrf5_v16.0.0/libuarte_example.html

https://infocenter.nordicsemi.com/topic/sdk_nrf5_v16.0.0/lib_libuarte.html 

[Somesh Burkule]

Hi Kenneth,

Problem is resolved. there was issue in hardware. Vcc and Rx line of nordic was parallel that may creating noise and causes communication error.

I have checked with other hardware which is error free.

Thank you for your help. 

Regards,

Somesh Burkule

[Somesh Burkule]

Hi Kenneth,

Sorry for this again but my device is not receiving data from nrf52 sometime. maybe UART is getting hanged.

As I removed APP_ERROR_HANDLER(p_event->data.error_communication) from uart handler, there no soft reset now but causing other issues in uart communication.

when device is kept live for long time with continuous UART communication, at some time(Its Random, it varies from 2-10 days) nrf52 stops sending data to other MCU. When I given power cycle to the device then starts sending data and works normal.

I am not getting what is the issue. is UART getting stucked somewhere? or softdevice ?

Please help me to resolve the same.

[Somesh Burkule]

Hello Kenneth,

I have debugged my code. I think its hardfault.

I have attached screenshots for your reference. Please tell me what it is actually.