Error in establishing communication between ADT7410 and nRF52840.

[Ashu@2000]

Hey hi,

I am trying to establish communication between ADT7410 and nRF52840 using I2C that is the TWI module.

I have successfully checked the address of the ADT7410 with nRF52840.

The output of so is as follow:

00> <info> app: Application Started
00>
00> <info> app: Entered the twi_init loop
00>
00> <info> app: twi is been initalized
00>
00> <info> app: error_code is : 0x0
00>
00> <info> app: Successfully detected a device at address : 0x48
00>

But unable to get the temperature value from the sensor.

Tried debugging through NRF_LOG_INFO

the program doesn't print "The Error code 2 is %x" from the ADT7410_set_mode.

ADT7410_set_mode function is as follow:

void ADT7410_set_mode(void)
{
NRF_LOG_INFO("We have entered ADT7410 set mode");
NRF_LOG_FLUSH();
ret_code_t err_code;

/* Writing to LM75B_REG_CONF "0" set temperature sensor in NORMAL mode. */
uint8_t reg[2] = {ADT7410_REG_CONF, NORMAL_MODE};
err_code = nrf_drv_twi_tx(&m_twi, ADT7410_ADDR, reg, sizeof(reg), false);
APP_ERROR_CHECK(err_code);
NRF_LOG_INFO("The Error code 1 is %x",err_code);
NRF_LOG_FLUSH();
while (m_xfer_done == false);

/* Writing to pointer byte. */
reg[0] = ADT7410_REG_TEMP;
m_xfer_done = false;
err_code = nrf_drv_twi_tx(&m_twi, ADT7410_ADDR, reg,1, false);
APP_ERROR_CHECK(err_code);
NRF_LOG_INFO("The Error code 2 is %x",err_code);
NRF_LOG_FLUSH();
while (m_xfer_done == false);
}

Please do guide me to solve this issue.

[awneil]

So what debugging have you done to find out what's going on?

Have you looked at the I2C wires with an analyser or scope to see what's happening?

Have you carefully checked against the ADT7410 datasheet that you have everything correct - both hardware and the I2C messages?

[Ashu@2000]

Yes, I have checked the hardware with DSO, and it's working perfectly.

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/** @file
 * @defgroup tw_sensor_example main.c
 * @{
 * @ingroup nrf_twi_example
 * @brief TWI Sensor Example main file.
 *
 * This file contains the source code for a sample application using TWI.
 *
 */

#include <stdio.h>
#include "boards.h"
#include "app_util_platform.h"
#include "app_error.h"
#include "nrf_drv_twi.h"
#include "nrf_delay.h"


#include "nrf_log.h"
#include "nrf_log_ctrl.h"
#include "nrf_log_default_backends.h"

/* TWI instance ID. */
#define TWI_INSTANCE_ID     0
//#define APP_UART_DRIVER_INSTANCE 1

/* Common addresses definition for temperature sensor. */
#define ADT7410_ADDR          (0x48U)

#define ADT7410_REG_TEMP      0x00U
#define ADT7410_REG_STATUS    0x02U
#define ADT7410_REG_CONF      0x03U

/* Mode for ADT7410. */
#define NORMAL_MODE 0x40U

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

/* TWI instance. */
static const nrf_drv_twi_t m_twi = NRF_DRV_TWI_INSTANCE(TWI_INSTANCE_ID);

/* Buffer for samples read from temperature sensor. */
static uint8_t m_sample;

/**
 * @brief Function for setting active mode on MMA7660 accelerometer.
 */
void ADT7410_set_mode(void)
{
	  NRF_LOG_INFO("We have entered ADT7410 set mode");
	  NRF_LOG_FLUSH();
    ret_code_t err_code;
     
    /* Writing to LM75B_REG_CONF "0" set temperature sensor in NORMAL mode. */
    uint8_t reg[2] = {ADT7410_REG_CONF, NORMAL_MODE};
    err_code = nrf_drv_twi_tx(&m_twi, ADT7410_ADDR, reg, sizeof(reg), false);
    APP_ERROR_CHECK(err_code);
		NRF_LOG_INFO("The Error code 1 is %x",err_code);
	  NRF_LOG_FLUSH();
    while (m_xfer_done == false);

    /* Writing to pointer byte. */
    reg[0] = ADT7410_REG_TEMP;
    m_xfer_done = false;
    err_code = nrf_drv_twi_tx(&m_twi, ADT7410_ADDR, reg,1, false);
    APP_ERROR_CHECK(err_code);
		NRF_LOG_INFO("The Error code 2 is %x",err_code);
	  NRF_LOG_FLUSH();
    while (m_xfer_done == false);
}

/**
 * @brief Function for handling data from temperature sensor.
 *
 * @param[in] temp          Temperature in Celsius degrees read from sensor.
 */
__STATIC_INLINE void data_handler(uint8_t temp)
{
    NRF_LOG_INFO("Temperature: %d Celsius degrees.", temp);
	  NRF_LOG_FLUSH();
}

/**
 * @brief TWI events handler.
 */
 void twi_handler(nrf_drv_twi_evt_t const * p_event, void * p_context)
{
    switch (p_event->type)
    {
        case NRF_DRV_TWI_EVT_DONE:
					  NRF_LOG_INFO("We have entered NRF_DRV_TWI_EVT_DONE");
				    NRF_LOG_FLUSH();
            if (p_event->xfer_desc.type == NRF_DRV_TWI_XFER_RX)
            {
                data_handler(m_sample);
            }
            m_xfer_done = true;
            break;
        default:
            break;
    }
}

/**
 * @brief UART initialization.
 */
void twi_init (void)
{
	  NRF_LOG_INFO("We have entered twi_init");
	  NRF_LOG_FLUSH();
    ret_code_t err_code;

    const nrf_drv_twi_config_t twi_lm75b_config = {
       .scl                = ARDUINO_SCL_PIN,
       .sda                = ARDUINO_SDA_PIN,
       .frequency          = NRF_DRV_TWI_FREQ_400K,
       .interrupt_priority = APP_IRQ_PRIORITY_HIGH,
       .clear_bus_init     = false
    };

    err_code = nrf_drv_twi_init(&m_twi, &twi_lm75b_config, twi_handler, NULL);
    APP_ERROR_CHECK(err_code);

    nrf_drv_twi_enable(&m_twi);
}

/**
 * @brief Function for reading data from temperature sensor.
 */
static void read_sensor_data()
{
	  NRF_LOG_INFO("We have entered read_sensor_data ");
	  NRF_LOG_FLUSH();
    m_xfer_done = false;

    /* Read 1 byte from the specified address - skip 3 bits dedicated for fractional part of temperature. */
    ret_code_t err_code = nrf_drv_twi_rx(&m_twi, ADT7410_ADDR, &m_sample, 2);
    APP_ERROR_CHECK(err_code);
	  NRF_LOG_INFO("The Error code 3 is %x",err_code);
	  NRF_LOG_FLUSH();
}

/**
 * @brief Function for main application entry.
 */
int main(void)
{
    APP_ERROR_CHECK(NRF_LOG_INIT(NULL));
    NRF_LOG_DEFAULT_BACKENDS_INIT();

    NRF_LOG_INFO("\r\nTWI sensor example started.");
    NRF_LOG_FLUSH();
    twi_init();
    ADT7410_set_mode();

    while (true)
    {
        nrf_delay_ms(500);

        do
        {
            __WFE();
        }while (m_xfer_done == false);
				
				NRF_LOG_INFO("Operatino of receiving is completed ");
	      NRF_LOG_FLUSH();

        read_sensor_data();
        NRF_LOG_FLUSH();
    }
}

/** @} */

[Ashu@2000]

Yes, I have studied the ADT7410 datasheet.

A1 and A0 are grounded in my case.

So the address is 0x48 

[Jørgen Holmefjord]

Can you post a logic trace of the TWI bus, showing what is happening on the bus when you run your code?

Are you receiving any of the other possible events (NRF_DRV_TWI_EVT_ADDRESS_NACK/NRF_DRV_TWI_EVT_DATA_NACK) in twi_handler?

[Ashu@2000]

No, I am not able to get any such kind of error, the only thing I am getting on RTT is as follow:

00> TWI sensor example started.
00>
00> <info> app: We have entered twi_init
00>
00> <info> app: We have entered ADT7410 set mode
00>
00> <info> app: The Error code 1 is 0

Rest I have posted code.

[Jørgen Holmefjord]

Your twi_handler does not contain cases for the other events, so you will not know if they are arriving unless you put a breakpoint in the handler and check manually value of p_event->type.

You can add code to print such events:

 void twi_handler(nrf_drv_twi_evt_t const * p_event, void * p_context)
{
    switch (p_event->type)
    {
        case NRF_DRV_TWI_EVT_DONE:
					  NRF_LOG_INFO("We have entered NRF_DRV_TWI_EVT_DONE");
				    NRF_LOG_FLUSH();
            if (p_event->xfer_desc.type == NRF_DRV_TWI_XFER_RX)
            {
                data_handler(m_sample);
            }
            m_xfer_done = true;
            break;
        
        case NRF_DRV_TWI_EVT_ADDRESS_NACK:
            NRF_LOG_INFO("Received NRF_DRV_TWI_EVT_ADDRESS_NACK");
            break;
        
        case NRF_DRV_TWI_EVT_DATA_NACK:
            NRF_LOG_INFO("Received NRF_DRV_TWI_EVT_DATA_NACK");
            break;
            
        default:
            NRF_LOG_INFO("Unhandled event: %d", p_event->type);
            break;
    }
}