AnsweredAssumed Answered

STM32F429 Discovery & ADXL345 I2C communication problem[solved]

Question asked by camiruaga.iker on Oct 10, 2015
Latest reply on Sep 12, 2016 by zotes.jesus
Hi I am having problems with I2C communication. I am trying to read an accelerometer using the 429 discovery but I always get 0 from the sensor. SO probably some command is wrong. The program compiles and runs withou errors.

Here is my code:

/**
  ******************************************************************************
  * File Name          : main.c
  * Description        : Main program body
  ******************************************************************************
  *
  * COPYRIGHT(c) 2015 STMicroelectronics
  *
  * 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 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 STMicroelectronics nor the names of its contributors
  *      may be used to endorse or promote products derived from this software
  *      without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER 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.
  *
  ******************************************************************************
  */
/* Includes ------------------------------------------------------------------*/
#include "stm32f4xx_hal.h"


/* USER CODE BEGIN Includes */
#include "ADXL345.h"
#include "I2C.h"
/* USER CODE END Includes */


/* Private variables ---------------------------------------------------------*/
I2C_HandleTypeDef hi2c1;


UART_HandleTypeDef huart1;


/* USER CODE BEGIN PV */
/* Private variables ---------------------------------------------------------*/


/* USER CODE END PV */


/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_I2C1_Init(void);
static void MX_USART1_UART_Init(void);


/* USER CODE BEGIN PFP */
/* Private function prototypes -----------------------------------------------*/


/* USER CODE END PFP */


/* USER CODE BEGIN 0 */
void Accel_Init(void);
void Accel_Read(void);
uint8_t ADXL345_Measure_Mode = 0x08;
uint8_t ADXL345_Full_Resolution_8 = 0x0A;
uint8_t ADXL345_DATARATE_400_HZ     = 0x0C;
uint8_t Buffer[6] = {0};
uint8_t Accel_Raw[3] = {0};
/* USER CODE END 0 */


int main(void)
{


  /* USER CODE BEGIN 1 */


  /* USER CODE END 1 */


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


  /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
  HAL_Init();


  /* Configure the system clock */
  SystemClock_Config();


  /* Initialize all configured peripherals */
  MX_GPIO_Init();
  MX_I2C1_Init();
  MX_USART1_UART_Init();


  /* USER CODE BEGIN 2 */
     void Accel_init();
     
  /* USER CODE END 2 */


  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
  /* USER CODE END WHILE */


  /* USER CODE BEGIN 3 */
          Accel_Read();
          HAL_UART_Transmit(&huart1, &Accel_Raw[0], 2, 10000);
  }
  /* USER CODE END 3 */


}


/** System Clock Configuration
*/
void SystemClock_Config(void)
{


  RCC_OscInitTypeDef RCC_OscInitStruct;
  RCC_ClkInitTypeDef RCC_ClkInitStruct;


  __PWR_CLK_ENABLE();


  __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 = 4;
  HAL_RCC_OscConfig(&RCC_OscInitStruct);


  HAL_PWREx_ActivateOverDrive();


  RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_SYSCLK|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(&RCC_ClkInitStruct, FLASH_LATENCY_5);


  HAL_SYSTICK_Config(HAL_RCC_GetHCLKFreq()/1000);


  HAL_SYSTICK_CLKSourceConfig(SYSTICK_CLKSOURCE_HCLK);


  /* SysTick_IRQn interrupt configuration */
  HAL_NVIC_SetPriority(SysTick_IRQn, 0, 0);
}


/* I2C1 init function */
void MX_I2C1_Init(void)
{


  hi2c1.Instance = I2C1;
  hi2c1.Init.ClockSpeed = 100000;
  hi2c1.Init.DutyCycle = I2C_DUTYCYCLE_2;
  hi2c1.Init.OwnAddress1 = 110;
  hi2c1.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
  hi2c1.Init.DualAddressMode = I2C_DUALADDRESS_DISABLED;
  hi2c1.Init.OwnAddress2 = 0;
  hi2c1.Init.GeneralCallMode = I2C_GENERALCALL_DISABLED;
  hi2c1.Init.NoStretchMode = I2C_NOSTRETCH_DISABLED;
  HAL_I2C_Init(&hi2c1);


}


/* USART1 init function */
void MX_USART1_UART_Init(void)
{


  huart1.Instance = USART1;
  huart1.Init.BaudRate = 115200;
  huart1.Init.WordLength = UART_WORDLENGTH_8B;
  huart1.Init.StopBits = UART_STOPBITS_1;
  huart1.Init.Parity = UART_PARITY_NONE;
  huart1.Init.Mode = UART_MODE_TX_RX;
  huart1.Init.HwFlowCtl = UART_HWCONTROL_NONE;
  huart1.Init.OverSampling = UART_OVERSAMPLING_16;
  HAL_UART_Init(&huart1);


}


/** Configure pins as 
        * Analog 
        * Input 
        * Output
        * EVENT_OUT
        * EXTI
*/
void MX_GPIO_Init(void)
{


  /* GPIO Ports Clock Enable */
  __GPIOH_CLK_ENABLE();
  __GPIOA_CLK_ENABLE();
  __GPIOB_CLK_ENABLE();


}


/* USER CODE BEGIN 4 */
void Accel_Init(void)
{
     I2C_Write(I2C1, ADXL345_WRITE, ADXL345_REG_DATA_FORMAT, &ADXL345_Full_Resolution_8, 1);
     I2C_Write(I2C1, ADXL345_WRITE, ADXL345_REG_BW_RATE, &ADXL345_DATARATE_400_HZ, 1);
     I2C_Write(I2C1, ADXL345_WRITE, ADXL345_REG_POWER_CTL, &ADXL345_Measure_Mode, 1);
     
     
}


void Accel_Read(void)
{
     I2C_Read(I2C1, 0xA7, 0x32, &Buffer[0], 1);
     I2C_Read(I2C1, ADXL345_READ, ADXL345_REG_DATAX1, &Buffer[1], 1);
     I2C_Read(I2C1, ADXL345_READ, ADXL345_REG_DATAY0, &Buffer[2], 1);
     I2C_Read(I2C1, ADXL345_READ, ADXL345_REG_DATAY1, &Buffer[3], 1);
     I2C_Read(I2C1, ADXL345_READ, ADXL345_REG_DATAZ0, &Buffer[4], 1);
     I2C_Read(I2C1, ADXL345_READ, ADXL345_REG_DATAZ1, &Buffer[5], 1);
     
     
     Accel_Raw[0] = (((int) Buffer[3]) << 8) | Buffer[2];  // X axis (internal sensor y axis)
  Accel_Raw[1] = (((int) Buffer[1]) << 8) | Buffer[0];  // Y axis (internal sensor x axis)
  Accel_Raw[2] = (((int) Buffer[5]) << 8) | Buffer[4];  // Z axis (internal sensor z axis)
     
     
     
}
/* USER CODE END 4 */


#ifdef USE_FULL_ASSERT


/**
   * @brief Reports the name of the source file and the source line number
   * where the assert_param error has occurred.
   * @param file: pointer to the source file name
   * @param line: assert_param error line source number
   * @retval None
   */
void assert_failed(uint8_t* file, uint32_t line)
{
  /* USER CODE BEGIN 6 */
  /* User can add his own implementation to report the file name and line number,
    ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
  /* USER CODE END 6 */


}


#endif

And these are the write and read functions I am using:

I2C_Result_t I2C_Read(I2C_TypeDef* I2Cx, uint8_t device_address, uint8_t register_address, uint8_t* data, uint16_t count) {
     I2C_HandleTypeDef* Handle = I2C_GetHandle(I2Cx);
     
     /* Send register address */
     if (HAL_I2C_Master_Transmit(Handle, (uint16_t)device_address, &register_address, 1, 1000) != HAL_OK) {
          /* Check error */
          if (HAL_I2C_GetError(Handle) != HAL_I2C_ERROR_AF) {
               
          }
          
          /* Return error */
          return I2C_Result_Error;
     }
     
     /* Receive multiple byte */
     if (HAL_I2C_Master_Receive(Handle, device_address, data, count, 1000) != HAL_OK) {
          /* Check error */
          if (HAL_I2C_GetError(Handle) != HAL_I2C_ERROR_AF) {
               
          }
          
          /* Return error */
          return I2C_Result_Error;
     }
     
     /* Return OK */
     return I2C_Result_Ok;
}




I2C_Result_t I2C_Write(I2C_TypeDef* I2Cx, uint8_t device_address, uint16_t register_address, uint8_t* data, uint16_t count) {
     I2C_HandleTypeDef* Handle = I2C_GetHandle(I2Cx);


     /* Try to transmit via I2C */
     if (HAL_I2C_Mem_Write(Handle, device_address, register_address, register_address > 0xFF ? I2C_MEMADD_SIZE_16BIT : I2C_MEMADD_SIZE_8BIT, data, count, 1000) != HAL_OK) {
          /* Check error */
          if (HAL_I2C_GetError(Handle) != HAL_I2C_ERROR_AF) {
               
          }
          
          /* Return error */
          return I2C_Result_Error;
     }
     
     /* Return OK */
     return I2C_Result_Ok;
}

I am using the HAL library with the initial configuration of CubeMx.

Outcomes