Here is my code and I encountered the error. I use H7A3ZI-Q board
/* USER CODE BEGIN Header */
/**
******************************************************************************
* @file : main.c
* @brief : Main program body
******************************************************************************
* @attention
*
* <h2><center>© 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
// ...
