TWI Sensor sensor_set_mode NRF_ERROR_INVALID_ADDR

Question

Hi, I'm using nRF52 DK (nRF52832), demo code <TWI sensor>. I'm using this slave sensor to communicate with Master nRF52 DK. My code gets stuck at sensor_set_mode() function. On PuTTY, it shows that the while loop never exits. The error is NRF_ERROR_INVALID_ADDR. Any help, pls?

/* Creating a TWI master driver instance. */
#define TWI_INSTANCE_ID     0
static const nrf_drv_twi_t m_twi = NRF_DRV_TWI_INSTANCE(TWI_INSTANCE_ID);

// address = 0x21 or 0x22 or 0x23 depends on the resistor valur at ADDR port
#define SENSOR_ADDR          (0x22U >> 1) 

// In order to set sensor as continuous mode, use register 0x3608
#define continuous_mode_command1 0x36U
#define continuous_mode_command2 0x08U

/* Indicates if operation on TWI has ended. */
static volatile bool m_xfer_done = false;

void sensor_set_mode(void)
{
    ret_code_t err_code;
    NRF_LOG_INFO("sensor_set_mode started\r\n");
    // Writing CONTINUOUS_MODE = 0x3608U into SDP3x configuration register. Set SDP3x sensor in continuous mode. 
    uint8_t reg0 = continuous_mode_command1;
    uint8_t reg1 = continuous_mode_command2;
    
    uint16_t reg = ((reg0 << 8) | reg1);
    NRF_LOG_INFO("reg16bit: %x\r\n",reg);


    /* Function for sending data to a TWI slave.       
        * @param[in] p_instance Pointer to the driver instance structure.
        * @param[in] address    Address of a specific slave device (only 7 LSB).
        * @param[in] p_data     Pointer to a transmit buffer.
        * @param[in] length     Number of bytes to send.
        * @param[in] no_stop    If set, the stop condition is not generated on the bus
        *                       after the transfer has completed successfully (allowing
        *                       for a repeated start in the next transfer).
        This function will return NRF_SUCCESS if the procedure was successful.
    */
    err_code = nrf_drv_twi_tx(&m_twi, SENSOR_ADDR, reg, sizeof(reg), false);
    NRF_LOG_INFO("error code6 = %s\r\n",nrf_strerror_find(err_code));
    
    NRF_LOG_INFO(" set i2c address\r\n");
    APP_ERROR_CHECK(err_code);
    while (m_xfer_done == false);
    NRF_LOG_INFO("done\r\n");
    
}

Jørgen Holmefjord · Accepted Answer

Passing &m_sample to data_handler does not really make sense, then you are passing the reference to a pointer (remember that m_sample is an array, i.e. already a pointer). You can change the function declaration to take an array as argument: 
 void data_handler(uint8_t pressure_raw_data[2]) 
 And the pass the array directly: 
 data_handler(m_sample); 
 Or you can make m_sample into a uint16 variable before passing it: 
 uint16_t pressure = ((m_sample[0] << 8) | m_sample[1]);
data_handler(pressure);

void data_handler(uint16_t pressure_raw_data)
{
 ...
} 
 Anyway, I'm not sure that this is the reason for the log not printing, at least I cannot see any reasons that the code you have should crash. 
 You can try to disable deferred logging in your sdk_config.h file, to see if something is preventing the application from running until the first NRF_LOG_FLUSH() macro: 
 #define NRF_LOG_DEFERRED 0

TWI Sensor sensor_set_mode NRF_ERROR_INVALID_ADDR

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