HDC 1080 interfacing with nucleo F401RE

[Nitish2506]

I have written a code for TI above model sensor interfacing with F401RE. Code not working. Pls help me to correct this code.

[Issamos]

Hello @Nitish2506 

Her is the correct version.

/* USER CODE BEGIN Header */

/**

  ******************************************************************************

  * @file : main.c

  * @brief : Main program body

  ******************************************************************************

  * @attention

  *

  * <h2><center>&copy; Copyright (c) 2019 STMicroelectronics.

  * All rights reserved.</center></h2>

  *

  * This software component is licensed by ST under BSD 3-Clause license,

  * the "License"; You may not use this file except in compliance with the

  * License. You may obtain a copy of the License at:

  * opensource.org/licenses/BSD-3-Clause

  *

  ******************************************************************************

  */

/* USER CODE END Header */

/* Includes ------------------------------------------------------------------*/

#include "main.h"

/* Private includes ----------------------------------------------------------*/

/* USER CODE BEGIN Includes */

#include <string.h>

#include <stdio.h>

/* USER CODE END Includes */

/* Private typedef -----------------------------------------------------------*/

/* USER CODE BEGIN PTD */

/* USER CODE END PTD */

/* Private define ------------------------------------------------------------*/

/* USER CODE BEGIN PD */

/* USER CODE END PD */

/* Private macro -------------------------------------------------------------*/

/* USER CODE BEGIN PM */

/* USER CODE END PM */

/* Private variables ---------------------------------------------------------*/

I2C_HandleTypeDef hi2c1;

UART_HandleTypeDef huart2;

/* USER CODE BEGIN PV */

static const uint8_t TMP102_ADDR = 0x48 << 1; // Use 8-bit address

static const uint8_t REG_TEMP = 0x00;

/* USER CODE END PV */

/* Private function prototypes -----------------------------------------------*/

void SystemClock_Config(void);

static void MX_GPIO_Init(void);

static void MX_USART2_UART_Init(void);

static void MX_I2C1_Init(void);

/* USER CODE BEGIN PFP */

/* USER CODE END PFP */

/* Private user code ---------------------------------------------------------*/

/* USER CODE BEGIN 0 */

/* USER CODE END 0 */

/**

  * @brief The application entry point.

  * @retval int

  */

int main(void)

{

  /* USER CODE BEGIN 1 */

  HAL_StatusTypeDef ret;

  uint8_t buf[12];

  int16_t val;

  float temp_c;

  /* USER CODE END 1 */

  /* MCU Configuration--------------------------------------------------------*/

  /* Reset of all peripherals, Initializes the Flash interface and the Systick. */

  HAL_Init();

  /* USER CODE BEGIN Init */

  /* USER CODE END Init */

  /* Configure the system clock */

  SystemClock_Config();

  /* USER CODE BEGIN SysInit */

  /* USER CODE END SysInit */

  /* Initialize all configured peripherals */

  MX_GPIO_Init();

  MX_USART2_UART_Init();

  MX_I2C1_Init();

  /* USER CODE BEGIN 2 */

  /* USER CODE END 2 */

  /* Infinite loop */

  /* USER CODE BEGIN WHILE */

  while (1)

  {

    // Tell TMP102 that we want to read from the temperature register

    buf[0] = REG_TEMP;

    ret = HAL_I2C_Master_Transmit(&hi2c1, TMP102_ADDR, buf, 1, HAL_MAX_DELAY);

    if ( ret != HAL_OK ) {

      strcpy((char*)buf, "Error Tx\r\n");

    } else {

      // Read 2 bytes from the temperature register

      ret = HAL_I2C_Master_Receive(&hi2c1, TMP102_ADDR, buf, 2, HAL_MAX_DELAY);

      if ( ret != HAL_OK ) {

        strcpy((char*)buf, "Error Rx\r\n");

      } else {

        //Combine the bytes

        val = ((int16_t)buf[0] << 4) | (buf[1] >> 4);

        // Convert to 2's complement, since temperature can be negative

        if ( val > 0x7FF ) {

          val |= 0xF000;

        }

        // Convert to float temperature value (Celsius)

        temp_c = val * 0.0625;

        // Convert temperature to decimal format

        temp_c *= 100;

        sprintf((char*)buf,

              "%u.%u C\r\n",

              ((unsigned int)temp_c / 100),

              ((unsigned int)temp_c % 100));

      }

    }

    // Send out buffer (temperature or error message)

    HAL_UART_Transmit(&huart2, buf, strlen((char*)buf), HAL_MAX_DELAY);

    // Wait

    HAL_Delay(500);

    /* USER CODE END WHILE */

    /* USER CODE BEGIN 3 */

  }

  /* USER CODE END 3 */

}

// Rest of auto-generated Cube functions

You can find more details her.

Best regards.

II

[Foued_KH]

Hello @Nitish2506 , 

Verify the connection SDA-SDA , SCL -SCL ,GND-GND ...
You can use an oscilloscope and check the SDA and SCL behavior .

Foued