Twi problem

[dewal]

Hi forum,

I am working on nrf52832 custom board, using sdk 15.0.0.

I referred example/peripherals/twi_sesnor example as reference. I am trying to interface LIS2dw12 with nrf52832.

While debugging, I found that the board gets stuck in the "while (m_xfer_done == false)" loop inside the function that writes to the board to read data from the board.

please help me slove this error.

[dewal]

//
// TWI events handler.
//
void twi_handler(nrf_drv_twi_evt_t const * p_event, void * p_context)
{
    switch (p_event->type)
    {
        // TWI event completed
        // If data was being read, jump to the data handler
        // Otherwise, assume it was a transmit and just indicate transfer is done
        case NRF_DRV_TWI_EVT_DONE:
            if (p_event->xfer_desc.type == NRF_DRV_TWI_XFER_RX) // Reading data
            {
              if (reg[0] == HTS221_WHO_AM_I) // Reading from HTS221 WHO_AM_I register
              id_handler(m_sample);
             if (reg[0] == HTS221_CTRL_REG1) // Reading CTRL_REG1
                reg1_handler(m_sample);
              if (reg[0] == 0xB0) // Reading the calibration data
               calibration_handler(calibration_regs);
              if (reg[0] == 0xAA) // Reading the temperature registers
                temperature_handler(raw_temp);
             if (reg[0] == HTS221_STATUS_REG) // Reading the status register
                status_handler(m_sample);
            if (reg[0] == 0xA8)  // Reading the humidity registers
               humidity_handler(raw_hum);
            }
           m_xfer_done = true;
        // m_xfer_done = false;
            break;
        default:
            break;
    }
}

//
// TWI initialization.
//
void twi_init (void)
{
    ret_code_t err_code;

    const nrf_drv_twi_config_t twi_hts221_config = {
       .scl                =SCL_PIN,
       .sda                =SDA_PIN,
       .frequency          = NRF_DRV_TWI_FREQ_100K,
       .interrupt_priority = APP_IRQ_PRIORITY_HIGH,
       .clear_bus_init     = false
    };
 
    err_code = nrf_drv_twi_init(&m_twi, &twi_hts221_config, twi_handler, NULL);
    APP_ERROR_CHECK(err_code);
    printf("init: %d\n",err_code);

    nrf_drv_twi_enable(&m_twi);

    //
    // read calibration registers
    //
    reg[0]=0xB0; // 1st Register address of the calibration registers
    // Note bit 7 is set for register address incrementing. 0x30 | 0x80
    err_code = nrf_drv_twi_tx(&m_twi, HTS221_ADDR, reg, sizeof(reg),true);
    APP_ERROR_CHECK(err_code);
    // Wait for transmit to complete
    while (m_xfer_done == false);
    // Reset TWI event complete flag
    m_xfer_done = false;
    // Read 16 bytes of raw calibration data from 0x30-3F
    // Data will be returned via twi event handler
    err_code = nrf_drv_twi_rx(&m_twi, HTS221_ADDR, calibration_regs, sizeof(calibration_regs));
    APP_ERROR_CHECK(err_code);

}

if anymore required let me know. few days ago I was tested this code it works fine.it gives us temperature and humidity exact value match with surrounding temp.

[dewal]

Hi forum,

I tried to change interrupt priority to low it works once. after redumped code its not working.

please help me to slove this problem.

[Jared]

Hi,

Is the flag declared as static volatile? Can you set a breakpoint at 27 and upload a screenshot from debug view that shows that the handler is called and the variable is set to true. Also, what other modules/peripherals do you use? Is the Softdevice used?

regards

Jared