MPU9250 TWI Data Retrieve Crashing

RE: MPU9250 TWI Data Retrieve Crashing

aplatts — Tue, 11 Feb 2020 12:40:06 GMT

Hi Vidar

You are correct, I had ported a library which was using other legacy library's which was causing the issue. It has been a big learning curve, thanks for your excellent support.

RE: MPU9250 TWI Data Retrieve Crashing

Vidar Berg — Tue, 11 Feb 2020 12:33:11 GMT

Thanks, so it looks like you are getting the NRF_ERROR_TIMEOUT from nrf_drv_mpu_read_registers(). Maybe you can add some more logging in your TWI callback and see if you get the NRF_DRV_TWI_EVT_ADDRESS_NACK or NRF_DRV_TWI_EVT_DATA_NACK event instead of the expected NRF_DRV_TWI_EVT_DONE.

RE: MPU9250 TWI Data Retrieve Crashing

aplatts — Fri, 07 Feb 2020 13:56:02 GMT

Great, set that an now I get a much better view of the issue (but still don't understand):

New -DDEBUG Output:

<info> app: Read accelerometer sensor values

<error> app: ERROR 13 [NRF_ERROR_TIMEOUT] at ../../../main.c:741

PC at: 0x0002B413

In my code line 741 is line 31 in the code snippet below:

int main(void)
{
    // Initialize.
    log_init();
    leds_init();
    timers_init();
    buttons_init();
    power_management_init();
    twi_init();
    ble_stack_init();
    gap_params_init();
    gatt_init();
    services_init();
    advertising_init();
    conn_params_init();

    // Start execution.
    twiScanning();
    advertising_start();

    NRF_LOG_INFO("StingRay Started.");

    NRF_LOG_FLUSH();

    if (MPU9250) {
        // Read accelerometer sensor values
        NRF_LOG_INFO("Read accelerometer sensor values");
        uint32_t err_code;
        accel_values_t acc_values;
        err_code = app_mpu_read_accel(&acc_values);
        APP_ERROR_CHECK(err_code);
        NRF_LOG_INFO("Accel %d\r\nX: %06d\r\nY: %06d\r\nZ: %06d", acc_values.x, acc_values.y, acc_values.z);
        NRF_LOG_FLUSH();
    }

    // Enter main loop.
    for (;;)
    {
        idle_state_handle();
    }
}

RE: MPU9250 TWI Data Retrieve Crashing

Vidar Berg — Fri, 07 Feb 2020 13:31:23 GMT

Sorry. Are you using Makefiles from the SDK to compile? In that case, add this line "CFLAGS += -DDEBUG" together with the other C flags.

RE: MPU9250 TWI Data Retrieve Crashing

aplatts — Fri, 07 Feb 2020 13:17:45 GMT

Thanks, newbie ish. How do I do that?

RE: MPU9250 TWI Data Retrieve Crashing

Vidar Berg — Fri, 07 Feb 2020 12:46:23 GMT

Yes, if you add the "DEBUG" flag to your list of preprocessor symbols ( ie add -DDEBUG)

RE: MPU9250 TWI Data Retrieve Crashing

aplatts — Fri, 07 Feb 2020 12:43:54 GMT

I’m using VSC, can I get a similar output with NRF_LOG?

RE: MPU9250 TWI Data Retrieve Crashing

Vidar Berg — Fri, 07 Feb 2020 12:08:53 GMT

Hi,

Are you using Segger Embedded Studio? In that case, please select the "Debug" target from the drop-down menu on the top left side before you start debugging. This will make the crash log more verbose. Instead of just "Fatal error" it will include the file name and line number of where the error occurred.