nRF52832 with HDC2080 I2C

Question

Hi, I connect the HDC2080 with nrf 52832. but I cant read anything from the terminal.
What It's showing is just

[ <info> app:
TWI sensor example]

and I connect SDA --> pin 27

SCL --> pin25

INTI --> not connected

VCC --> VDD

GND --> GND

Please help me thanks!

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/**
 * Copyright (c) 2015 - 2017, Nordic Semiconductor ASA
 * 
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 * 
 * 1. Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following disclaimer.
 * 
 * 2. Redistributions in binary form, except as embedded into a Nordic
 *    Semiconductor ASA integrated circuit in a product or a software update for
 *    such product, must reproduce the above copyright notice, this list of
 *    conditions and the following disclaimer in the documentation and/or other
 *    materials provided with the distribution.
 * 
 * 3. Neither the name of Nordic Semiconductor ASA nor the names of its
 *    contributors may be used to endorse or promote products derived from this
 *    software without specific prior written permission.
 * 
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

/**
 * Copyright (c) 2015 - 2017, Nordic Semiconductor ASA
 * 
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 * 
 * 1. Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following disclaimer.
 * 
 * 2. Redistributions in binary form, except as embedded into a Nordic
 *    Semiconductor ASA integrated circuit in a product or a software update for
 *    such product, must reproduce the above copyright notice, this list of
 *    conditions and the following disclaimer in the documentation and/or other
 *    materials provided with the distribution.
 * 
 * 3. Neither the name of Nordic Semiconductor ASA nor the names of its
 *    contributors may be used to endorse or promote products derived from this
 *    software without specific prior written permission.
 * 
 * 4. This software, with or without modification, must only be used with a
 *    Nordic Semiconductor ASA integrated circuit.
 * 
 * 5. Any software provided in binary form under this license must not be reverse
 *    engineered, decompiled, modified and/or disassembled.
 * 
 * THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS
 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 * 
 */

/** @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"

//#define NRF_LOG_MODULE_NAME APP
#include "nrf_log.h"
#include "nrf_log_ctrl.h"
#include "nrf_log_default_backends.h"

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

/* Common addresses definition for HDC2080 sensor. */
#define HDC2080_ADDR              0x40U

#define HDC2080_REG_TEMP_LOW      0x00U
#define HDC2080_REG_TEMP_HIGH     0x01U
#define HDC2080_REG_HUM_LOW       0x02U
#define HDC2080_REG_HUM_HIGH      0x03U
#define HDC2080_REG_CONF          0x0FU

#define device_scl 11
#define device_sda 12

/* Mode for HDC2080. */
#define MEAS_TRIG 1U

/* 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 byte read from HDC2080 sensor - 8 bit register- (temp_low,temp_high,hum_low,hum_high). */
static uint8_t m_sample[4] = {0,0,0,0};

/* Buffer for the real temp calculation - 16 bits once concatenated - */
static uint16_t temp = 0;
/* Buffer for the real hum calculation - 16 bits once concatenated - */
static uint16_t hum = 0;

/* Buffer for the calculated value of temp*/
static float temp_calc = 0;
/* Buffer for the calculated value of hum*/
static float hum_calc = 0;

/**
 * @brief Function for triggering measurement on HDC2080.
 */
void HDC2080_trigger_measurement(void)
{
  //	m_xfer_done = 0;  
		ret_code_t err_code;
    /* Writing to HDC2080_REG_CONF "1" to trigger measurements. */
    uint8_t reg[2] = {HDC2080_REG_CONF,MEAS_TRIG};
    err_code = nrf_drv_twi_tx(&m_twi, HDC2080_ADDR, reg, sizeof(reg), false);
    APP_ERROR_CHECK(err_code);
    NRF_LOG_INFO("\r\nMulti-read enable\r\n");
    while (m_xfer_done == false);
   


    /* Writing to pointer byte. */
    reg[0] = HDC2080_REG_TEMP_LOW;
    m_xfer_done = false;
    NRF_LOG_INFO("\r\nTemp\r\n");
    err_code = nrf_drv_twi_tx(&m_twi, HDC2080_ADDR, reg, 1, false);
    APP_ERROR_CHECK(err_code);
    while (m_xfer_done == false);
   
}

/**
 * @brief Function for handling data from temperature sensor.
 *
 * @param[in] temp   Temperature in Celsius degrees read from sensor.
 * @param[in] hum    Humidity in % read from sensor.
 */
__STATIC_INLINE void data_handler(float temp, float hum)
{
    NRF_LOG_INFO("Temperature: \r" NRF_LOG_FLOAT_MARKER " Celsius\r\n", NRF_LOG_FLOAT(temp));
    NRF_LOG_INFO("Humidity: \r" NRF_LOG_FLOAT_MARKER " %%\r\n", NRF_LOG_FLOAT(hum));
}

/**
 * @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:
            if (p_event->xfer_desc.type == NRF_DRV_TWI_XFER_RX)
            {
                /* Temperature conversion formula given in HDC2080 Datasheet - page 18 */
                temp = (uint8_t)m_sample[1] << 8 | m_sample[0];
                temp_calc = (float)(temp) * 165 / 65536 - 40;
                /* Humidity conversion formula given in HDC2080 Datasheet - page 18 */
                hum = (uint8_t)m_sample[3] << 8 | m_sample[2];
                hum_calc = (float)(hum)/(65536) * 100;
                /* Passing temp and hum to data_handler */
                data_handler(temp_calc, hum_calc);
            }
            m_xfer_done = true;

            /* not sure about this part if it is ok or not */
            if (p_event->xfer_desc.type == NRF_DRV_TWI_XFER_TX)
            {
                m_xfer_done = true;
            }
            break;
            
        default:
            break;
    }
}

/**
 * @brief UART initialization.
 */
void twi_init (void)
{
    ret_code_t err_code;

    const nrf_drv_twi_config_t twi_HDC2080_config = {
       .scl                = ARDUINO_SCL_PIN,
       .sda                = ARDUINO_SDA_PIN,
       .frequency          = NRF_TWI_FREQ_100K,
       /* I'm using IRQ priority low because i want to use this code with S130 Softdevice in the future */
       .interrupt_priority = APP_IRQ_PRIORITY_LOW,
       .clear_bus_init     = false
    };

    err_code = nrf_drv_twi_init(&m_twi, &twi_HDC2080_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()
{
    ret_code_t err_code;
  
    /* Read 4 bytes starting from the specified address */
    /* Start reading from HDC2080_REG_TEMP_LOW through HDC2080_REG_HUM_HIGH */
    /* This is working because on the terminal I can see temp and hum values */
    err_code = nrf_drv_twi_rx(&m_twi, HDC2080_ADDR, m_sample, sizeof(m_sample));
    APP_ERROR_CHECK(err_code);
}

/**
 * @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\r\n");
    NRF_LOG_FLUSH();
    twi_init();
    /* this is where i'm having trouble */
    /* if this function sits here, it triggers only one reading since we're out of the while loop */
    /* and then when read_sensor_data is called, it always sends the same measurement since this is */
    /* what the sensor saved in his registers the first time HDC2080_trigger_measurement was called */
    HDC2080_trigger_measurement();
    
    
    while (true)
    {
        /* But if i put HDC2080_trigger_measurement function here, it gives one reading on the output */ 
        /* and then the program ends saying "Fatal error" ?!?!?! */
     // HDC2080_trigger_measurement();  
			do
        {
          __WFE();
        }while (m_xfer_done == false);

       read_sensor_data();
       NRF_LOG_FLUSH();
       nrf_delay_ms(1000);
    }
}