My program gets stuck at NRF_BREAKPOINT_COND

[Sudeep R J]

Hello,

I am using a custom board that has a DSP and the Lairds BLE module BL651 that has nRF52810. I have written a simple program that sends a test data byte to the DSP and the DSP should return a response with a corresponding data. The uart_read function in DSP is a blocking function so I first run the DSP program and that will wait to receive the data from the BL651. The problem I am facing is when I run the program for BLE it directly goes and gets stuck at NRF_BREAKPOINT_COND in app_error_weak.c and hence there is no further process that occurs. The DSP still waits for the data.

Why is this happening with the BLE? I tried to debug this and when it enters the APP_ERROR_CHECK there in app_error_weak.c it gets stuck at NRF_BREAKPOINT_COND. I checked the err_code before entering APP_ERROR_CHECK and it is 0.

Please do help me with this as it is very urgent for me in my work. I am attaching the full code below.

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/** @file
 * @defgroup uart_example_main main.c
 * @{
 * @ingroup uart_example
 * @brief UART Example Application main file.
 *
 * This file contains the source code for a sample application using UART.
 *
 */

#include <stdbool.h>
#include <stdint.h>
#include <stdlib.h>
#include <stdio.h>
#include "app_uart.h"
#include "app_error.h"
#include "nrf_delay.h"
#include "nrf.h"
#include "nrf_gpio.h"
#include "bsp.h"
#if defined (UART_PRESENT)
#include "nrf_uart.h"
#endif
#if defined (UARTE_PRESENT)
#include "nrf_uarte.h"
#endif



//#define ENABLE_LOOPBACK_TEST  /**< if defined, then this example will be a loopback test, which means that TX should be connected to RX to get data loopback. */

#define MAX_TEST_DATA_BYTES     (15U)                /**< max number of test bytes to be used for tx and rx. */
#define UART_TX_BUF_SIZE 256                         /**< UART TX buffer size. */
#define UART_RX_BUF_SIZE 256                         /**< UART RX buffer size. */
volatile bool readFlag = true;
uint8_t pattern[10240];
void uart_error_handle(app_uart_evt_t * p_event)
{
    readFlag = false;
    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);
    }
}


#ifdef ENABLE_LOOPBACK_TEST
/* Use flow control in loopback test. */
#define UART_HWFC APP_UART_FLOW_CONTROL_ENABLED

/** @brief Function for setting the @ref ERROR_PIN high, and then enter an infinite loop.
 */
static void show_error(void)
{

    bsp_board_leds_on();
    while (true)
    {
        // Do nothing.
    }
}


/** @brief Function for testing UART loop back.
 *  @details Transmitts one character at a time to check if the data received from the loopback is same as the transmitted data.
 *  @note  @ref TX_PIN_NUMBER must be connected to @ref RX_PIN_NUMBER)
 */
static void uart_loopback_test()
{
    uint8_t * tx_data = (uint8_t *)("\r\nLOOPBACK_TEST\r\n");
    uint8_t   rx_data;

    // Start sending one byte and see if you get the same
    for (uint32_t i = 0; i < MAX_TEST_DATA_BYTES; i++)
    {
        uint32_t err_code;
        while (app_uart_put(tx_data[i]) != NRF_SUCCESS);

        nrf_delay_ms(10);
        err_code = app_uart_get(&rx_data);

        if ((rx_data != tx_data[i]) || (err_code != NRF_SUCCESS))
        {
            show_error();
        }
    }
    return;
}
#else
/* When UART is used for communication with the host do not use flow control.*/
#define UART_HWFC APP_UART_FLOW_CONTROL_DISABLED
#endif

/**
 * @brief Function for main application entry.
 */
int main(void)
{
    nrf_gpio_cfg_output(27);
    uint32_t err_code;

    bsp_board_init(BSP_INIT_LEDS);

    const app_uart_comm_params_t comm_params =
      {
          RX_PIN_NUMBER,
          TX_PIN_NUMBER,
          RTS_PIN_NUMBER,
          CTS_PIN_NUMBER,
          UART_HWFC,
          false,
#if defined (UART_PRESENT)
          NRF_UART_BAUDRATE_115200
#else
          NRF_UARTE_BAUDRATE_115200
#endif
      };

    APP_UART_FIFO_INIT(&comm_params,
                         UART_RX_BUF_SIZE,
                         UART_TX_BUF_SIZE,
                         uart_error_handle,
                         APP_IRQ_PRIORITY_LOWEST,
                         err_code);
    
    APP_ERROR_CHECK(err_code);
    

    uint8_t command[] = {0x02,0x84,0x85,0x89,0x90,0x91,0x93,0x95,0x96};
    //pattern = (uint8_t*) malloc(16384  * sizeof(uint8_t));
    int cmd_i = 0;
    //int data_i = 0;
    char tst_cmd = '4';    
    uint8_t tst_rsp = '9';
    int i = 0;

   
    while (true)
    {   

          while(app_uart_put(tst_cmd) != NRF_SUCCESS);
          
          while(app_uart_get(&tst_rsp) != NRF_SUCCESS);
          if(tst_cmd == tst_rsp)
            {
              //printf("Response received \n");
            }
      
          //Send pattern key. 
          while(app_uart_put(command[cmd_i]) != NRF_SUCCESS);
          
          //Command sent successfully

          while(i<10240)
    	   {
              if(app_uart_get(&pattern[i]) == NRF_SUCCESS)
              {
                i++;
              }
           }
          
          printf("%d", i);
          i = i+0;
    }
  }


/** @} */

Thanks & Regards

Sudeep R J

[Sigurd]

Make sure that you have DEBUG defined as preprocessor symbol. The error code should then be printed with NRF_LOG in app_error_fault_handler().

If you are using SES, you can simply set the build configuration to Debug.

[Sudeep R J]

Hi Sigurd,

Thanks for your reply.

Do you know how to do it in the IAR Embedded studio?

[Sigurd]

When debugging with IAR there are a couple of settings that need to be configured in order to display the correct debug information.

1) First make sure that you have “Generate debug information” enabled.

Go to Project -> Options -> C/C++ Compiler -> Output and select Generate debug information.

2) Add "DEBUG" to the list of pre-processor symbols in project options -> C/C++ Compiler -> preprocessor tab, see "defined symbols" field. 

You might need to do the same for the assembler

3) Set optimization to None

I would also recommend that you turn on the logging module, and use either UART(NRF_LOG_BACKEND_UART_ENABLED) or Segger RTT(NRF_LOG_BACKEND_RTT_ENABLED) as logger backends. Here you would need to make sure that you have NRF_LOG_ENABLED set to 1 in sdk_config.h

Sudeep R J said:

the program jumps to NRF_BREAKPOINT_COND and halts.

You should try to comment out, or remove the NRF_BREAKPOINT_COND

[Sudeep R J]

Hi Sigurd,

Thanks for your detailed post. I will try it out .