Uart issue NRF_BREAKPOINT_CND

[Rohit Rajapure]

Hello All,

I am developing project which is based on nRF52840 and uses UART.

This my nRF52840 UART connect to STM's MCU UART.

If I do the connect Rx-Tx, Tx-Rx and VCC, GND then I power up the STM board my nRF code entering into below attached app_error_weak file.

Attached is the image and code.

Please help me what is the problem it very urgent for me.

uart _Exercise20210513.zip

Thanks and Regards

Rohit R

[Karl Ylvisaker]

Hello Rohit,

To supplement @anweil 's answer, please make sure that you have DEBUG defined in your preprocessor defines, like shown in the included image.

This will make a detailed error message be printed to your logger whenever a non-NRF_SUCCESS error code is passed to an APP_ERROR_CHECK.
Do this, and let us know what this error message reads.

Best regards,
Karl

[Rohit Rajapure]

HI Karl,

Thank you for the quick response.

No, DEBUG is not mentioned in preprocessor defination window.

- I will do this

And one more thing is I am using Tx- P0_6 and Rx-P0_8. these nRF pins connected to Stm board.

will this log print still on putty?

Thanks and Regards

Rohit

[Karl Ylvisaker]

Rohit Rajapure said:

Thank you for the quick response.

No problem at all, I am happy to help!

Rohit Rajapure said:

And one more thing is I am using Tx- P0_6 and Rx-P0_8. these nRF pins connected to Stm board.

will this log print still on putty?

You will then have to use the RTT backend for the logger, you can configure this in your sdk_config.h file.
If you are working out of the ble_app_uart example, it is already configured to use the RTT backend.
The RTT messages will then show up in the SES Debug terminal, or you could download Segger's own RTT Viewer application to see them in a separate terminal.

Best regards,
Karl 

[Rohit Rajapure]

Hi Karl,

Thank you so much,

I will check with suggested example and enable RTT in my code and let you know the log.

Thanks and Regards

Rohit R

[Karl Ylvisaker]

Great, the error message will be very helpful for the continues debugging here.

Please let me know if you have any issues with or questions about getting the logger to use the RTT backend.

Best regards,
Karl

[Rohit Rajapure]

Hi Karl,

As per your suggestion, I have enabled the RTT backend logger in my code but unable to print any data on terminal.

Let me know what is the issue.

Thanks and Regards

Rohit R

[awneil]

Which terminal are you using?

If the terminal in SES, then what SES version?

See: https://devzone.nordicsemi.com/f/nordic-q-a/45985/nrf_log-not-working-on-segger-embedded-studio/275426#275426

[Rohit Rajapure]

Hi Awneil,

SES - v4.16.

Please find the attached image.

Thanks and Regards

Rohit

[awneil]

See the post I linked earlier.

Follow the link there to:

https://devzone.nordicsemi.com/f/nordic-q-a/67308/nrf5-sdk-v17-0-2-rtt-output-does-not-work-with-specified-ses-version

and:

https://devzone.nordicsemi.com/f/nordic-q-a/45985/nrf_log-not-working-on-segger-embedded-studio/181804#181804

Specifically:

https://devzone.nordicsemi.com/f/nordic-q-a/45985/nrf_log-not-working-on-segger-embedded-studio/182742#182742

Or try the standalone RTT viewer.

[Rohit Rajapure]

Hi,

Thanks for the response,

I will go through these links and try the suggested method.

also, one update from my end that, basically my end system is an HVAC system(Radiator with motor).

This Radiator has 2 MCU, 1. STM8 and 2. nRF as RF module (developing now).

1. STM8 is a base board with a motor connection and valve mounting on top. If I power up the Radiator it enters into preparation mode(motor spins once).

2. nrf52840 is an RF module that uses Zigbee protocol to communicate with another Zigbee-based gateway and process the commands. (which exchange between nRF and STM via UART).

3. So, it was observed that whenever I run the code first and then power on the Radiator during the preparation mode of Radiator I am facing this issue "NRF_BREAKPOINT_CND"

4. And, If first power on the Radiator and after motor rotation stops (preparation mode stops) if we run the code on nRF I didn't face this mentioned issue. I am able to read response also.

5. As of now, I am following step 4 to power and start the development as I have very little time.

In the meantime, I will go through the steps shared by you to resolve this issue.

One question,

1. How to read/ write mutliple data into buffer in UART interrupt. If you have any small code please share. I tried the below snippet but for read operation it did not worked. I need this because for few command I get 10 bytes and in some case I get 125byte.  To map as per my requirement need into array buffer or some thing for state exchange. so please if you have any one then do share it will help me lot. I will attach whatever method I tried to execute write and read operation.

Write operation , - Till now this is working,

  for(ui8TelegramIndex = 0; ui8TelegramIndex< sizeof(ui8GetFlagBuffer); ui8TelegramIndex++)
  {  
      while (app_uart_put(ui8GetFlagBuffer[ui8TelegramIndex]) != NRF_SUCCESS);  //send "Get_Bootloader" telegram to host device to read status
  }

Read operation, - Stop at second while get statement,

    else if(p_event->evt_type == APP_UART_DATA_READY)
    {
      while(app_uart_get(&ui8GetBuffer[ui8Index])!= NRF_SUCCESS);   //after get flag read ACK and send EOC 
        if((ui8Rx ==RESP_ACK) && (boolACKIgnore == false))
        {
          boolACKIgnore = true;
          while(app_uart_put(EOC)!= NRF_SUCCESS);
        }
        //read command response from MCU
        //while(app_uart_get(&ui8Rx)!= NRF_SUCCESS);
        if(ui8Rx == SYNC)
        {
           while(app_uart_get(&ui8Rx)!= NRF_SUCCESS);
           ui8RxIndex = ui8Rx;
           for(ui8Index = 0; ui8Index< ui8RxIndex-2; ui8Index++)
           {
              while(app_uart_get(&ui8Rx)!= NRF_SUCCESS);  //store data
              ui8GetBuffer[ui8Index] = ui8Rx;
           }
           while(app_uart_put(RESP_ACK)!= NRF_SUCCESS);
        }
        //After data read from MCU check for EOC
       // while(app_uart_get(&ui8Rx)!= NRF_SUCCESS);
        if(ui8Rx ==EOC)
        {
          boolACKIgnore = false;
          while(app_uart_put(RESP_ACK)!= NRF_SUCCESS);
        }
    }

Let me know your points,

Urgent,

Thanks and Regards

Rohit R