title: How do I use the STM32CUBEF4 HAL library to read out the sensor data with i2c?
body: <p>I want to use the latest HAL library instead of Standard Peripheral Library.</p>
  
  <p>And i want to readout the BMA250E G-sensor's chip_id, but it doesn't work.</p>
  
  <p>Value of aRxBuffer always keep at 0x00. But it should be 0xf9!</p>
  
  <p>What's wrong in my code?</p>
  
  <blockquote>
  <pre><code>‪#‎include‬ "stm32f4xx_hal.h" 
  
  #define I2Cx_SDA_GPIO_CLK_ENABLE() __HAL_RCC_GPIOB_CLK_ENABLE()
  #define I2Cx_SDA_PIN GPIO_PIN_9
  #define I2Cx_SDA_GPIO_PORT GPIOB
  #define I2Cx_SDA_AF GPIO_AF4_I2C1
  
  #define I2Cx_SCL_GPIO_CLK_ENABLE() __HAL_RCC_GPIOB_CLK_ENABLE()
  #define I2Cx_SCL_PIN GPIO_PIN_6
  #define I2Cx_SCL_GPIO_PORT GPIOB
  #define I2Cx_SCL_AF GPIO_AF4_I2C1
  
  #define I2Cx_CLK_ENABLE() __HAL_RCC_I2C1_CLK_ENABLE()
  #define I2Cx_FORCE_RESET() __HAL_RCC_I2C1_FORCE_RESET()
  #define I2Cx_RELEASE_RESET() __HAL_RCC_I2C1_RELEASE_RESET() 
  </code></pre>
  </blockquote>
  
  <pre><code>‪#‎define‬ I2C_ADDRESS 0x18 
  
  static void SystemClock_Config(void); 
  
  uint8_t aTxBuffer[2],aRxBuffer; 
  
  int main()
  { 
      HAL_Init(); 
      SystemClock_Config(); 
      I2C_HandleTypeDef I2cHandle;
  
      I2cHandle.Instance = I2C1;
      I2cHandle.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
      I2cHandle.Init.ClockSpeed = 400000;
      I2cHandle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE; 
      I2cHandle.Init.DutyCycle = I2C_DUTYCYCLE_16_9;
      I2cHandle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE; 
      I2cHandle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;
      I2cHandle.Init.OwnAddress1 = 0; 
      I2cHandle.Init.OwnAddress2 = 0; 
  
      HAL_I2C_Init(&amp;I2cHandle); 
  
      aTxBuffer[0]=0x00;
      HAL_I2C_Master_Transmit(&amp;I2cHandle, I2C_ADDRESS,aTxBuffer, 1, 10000);  
      HAL_I2C_Master_Receive(&amp;I2cHandle,I2C_ADDRESS|0x01 ,&amp;aRxBuffer, 1, 10000);  
      HAL_Delay(1000);
  } 
  </code></pre>
  
  <blockquote>
  <pre><code>static void SystemClock_Config(void) 
  { 
      RCC_ClkInitTypeDef RCC_ClkInitStruct;
      RCC_OscInitTypeDef RCC_OscInitStruct;
  
      __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
      RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE; 
      RCC_OscInitStruct.HSEState = RCC_HSE_ON; 
      RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON; 
      RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
      RCC_OscInitStruct.PLL.PLLM = 8; 
      RCC_OscInitStruct.PLL.PLLN = 360;
      RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2; 
      RCC_OscInitStruct.PLL.PLLQ = 7; 
      HAL_RCC_OscConfig(&amp;RCC_OscInitStruct); 
      RCC_ClkInitStruct.ClockType = 
          (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | 
           RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
      RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK; 
      RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1; 
      RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4;         
      RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2; 
      HAL_RCC_ClockConfig(&amp;RCC_ClkInitStruct, FLASH_LATENCY_5); 
  }
  
  void HAL_I2C_MspInit(I2C_HandleTypeDef *hi2c) 
  {
      GPIO_InitTypeDef GPIO_InitStruct; 
  
      I2Cx_SCL_GPIO_CLK_ENABLE(); 
      I2Cx_SDA_GPIO_CLK_ENABLE(); 
  
      GPIO_InitStruct.Pin = I2Cx_SCL_PIN;
      GPIO_InitStruct.Mode = GPIO_MODE_AF_OD;
      GPIO_InitStruct.Pull = GPIO_PULLUP; 
      GPIO_InitStruct.Speed = GPIO_SPEED_FAST;
      GPIO_InitStruct.Alternate = I2Cx_SCL_AF; 
      HAL_GPIO_Init(I2Cx_SCL_GPIO_PORT, &amp;GPIO_InitStruct);
  
      GPIO_InitStruct.Pin = I2Cx_SDA_PIN; 
      GPIO_InitStruct.Alternate = I2Cx_SDA_AF; 
      HAL_GPIO_Init(I2Cx_SDA_GPIO_PORT, &amp;GPIO_InitStruct);
  } 
  
  void HAL_I2C_MspDeInit(I2C_HandleTypeDef *hi2c) 
  {  
      I2Cx_FORCE_RESET(); 
      I2Cx_RELEASE_RESET();  
      HAL_GPIO_DeInit(I2Cx_SCL_GPIO_PORT, I2Cx_SCL_PIN);
      HAL_GPIO_DeInit(I2Cx_SDA_GPIO_PORT, I2Cx_SDA_PIN); 
  }
  </code></pre>
  </blockquote>