my program is getting stuck in assert_nrf_callback while using nrf_drv_twi_tx function

[Kapil Rawat]

Hi,
I'm using nrf52832 custom board and 14.2 SDK, S132.

In my program I'm using SAADC, PWM, I2C along with softdevice and PID.  my device is working fine for some time but after certain time (10-15 sec) of running it's going to assert_nrf_callback because of  nrf_drv_twi_tx. below function is creating issue after working for sometime  :

ret_code_t ltc2631_set_voltage(uint16_t val)
{
    /* Shift parameter val to get 2 8-bits values. */
    uint8_t reg[3] = {LTC2631_DAC_ADDRESS,
                      (val>>8), (val)};

    /*uint8_t reg[3] = {LTC2631_DAC_ADDRESS,
                      (0), (0)};*/
    m_xfer_done = false;

   
    ret_code_t err_code = nrf_drv_twi_tx(&m_twi, LTC2631_BASE_ADDRESS, reg, sizeof(reg), false);
    if (err_code != NRF_SUCCESS)
    {
      NRF_LOG_INFO("error Erase bonds!");
        return err_code;
    }
  
    //NRF_LOG_INFO("success Erase bonds!");
   
    while (m_xfer_done == false);

    return NRF_SUCCESS;
    
}

while debugging I saw if val (argument in above code ) value is lower device is running properly for more time. I'm using LTC2631 DAC IC (want to gain  0 - 1.2V output voltage by giving 0-20000 digital value).

Note:

1: TWI is working fine but after giving some command to device and calling above function it's getting stuck and calling assert_nrf_callback which i'm not able to see in NRF_LOG_INFO.

2: if I disable above function device is working as expected.

[Vidar Berg]

Hello,

Is the driver configured to operate in blocking or non-blocking mode (see Basic usage)? Also, have you checked if nrf_drv_twi_tx() returns with an error code?

Thanks

Vidar

[Kapil Rawat]

Hi Vidar,
I'm using blocking mode. I tried to check error code but my program is getting stuck and not showing anything after that (device reset required).

[Vidar Berg]

Hi,

Have you built the project with the "Debug" configuration?

This should make the app_error_fault_handler() in app_error_weak.c print out a crash log with information about the error code and where it was returned.

[Kapil Rawat]

Yes I tried but not getting any error in debug mode. It's getting stuck somewhere else.

[Vidar Berg]

Can you pause the debugger to see where it gets stuck?

[Kapil Rawat]

In my device there is one function which repeat itself for 40 times and each time it update it's parameter.  For first 6 -10 time function working as expected but after that device not responding and  required power off to reset. 

[Vidar Berg]

I understand, but I would like to know where in your code the program gets stuck. Are you familiar with debugging in SES? Can you pause the debugger to see where it ends up after the error occured?