Read/Write specific register value on I2C

[hbhim]

Hi,

I am using STM32L031K6 MCU and SW4STM32 IDE for development. I want to read/write specific register value of i2c slave device from MCU(i2c master)

Below is a code I am using.

#include "main.h"
 
#define I2C_ADDRESS        0x3c
#define MASTER_BOARD
#define I2C_TIMING      0x00B1112E 
 
I2C_HandleTypeDef I2cHandle;
 
uint8_t aTxBuffer[] = "ff";
uint8_t aRxBuffer[4];
 
void SystemClock_Config(void);
static uint16_t Buffercmp(uint8_t* pBuffer1, uint8_t* pBuffer2, uint16_t BufferLength);
static void Error_Handler(void);
 
int main(void)
{
  GPIO_InitTypeDef  GPIO_InitStruct;
  HAL_Init();
  SystemClock_Config();
  BSP_LED_Init(LED3);
 
  I2cHandle.Instance             = I2Cx;
  I2cHandle.Init.Timing          = I2C_TIMING;
  I2cHandle.Init.OwnAddress1     = I2C_ADDRESS;
  I2cHandle.Init.AddressingMode  = I2C_ADDRESSINGMODE_7BIT;
  I2cHandle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE;
  I2cHandle.Init.OwnAddress2     = 0xFF;
  I2cHandle.Init.OwnAddress2Masks = I2C_OA2_NOMASK;
  I2cHandle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;
  I2cHandle.Init.NoStretchMode   = I2C_NOSTRETCH_DISABLE;  
  
  if(HAL_I2C_Init(&I2cHandle) == HAL_ERROR)
  {
    Error_Handler();
  }
 
  
 HAL_I2CEx_ConfigAnalogFilter(&I2cHandle,I2C_ANALOGFILTER_ENABLE);
  do
  {
    if(HAL_I2C_Mem_Read(&I2cHandle, (uint16_t)I2C_ADDRESS, (uint16_t)0x00, I2C_MEMADD_SIZE_8BIT, (uint8_t *)aRxBuffer, 1, 10) != HAL_OK)
    {
      Error_Handler();
    }
    while (HAL_I2C_GetState(&I2cHandle) != HAL_I2C_STATE_READY)
    {
    }
  }
  while(HAL_I2C_GetError(&I2cHandle) == HAL_I2C_ERROR_AF);
 
  HAL_Delay(1000);
  while (1)
  {
  }
}
 
void SystemClock_Config(void)
{
  RCC_ClkInitTypeDef RCC_ClkInitStruct ={0};
  RCC_OscInitTypeDef RCC_OscInitStruct = {0};
  
  __HAL_RCC_PWR_CLK_ENABLE();
  
 __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
  
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
  RCC_OscInitStruct.HSIState = RCC_HSI_ON;
  RCC_OscInitStruct.PLL.PLLSource   = RCC_PLLSOURCE_HSI;
  RCC_OscInitStruct.PLL.PLLState    = RCC_PLL_ON;
  RCC_OscInitStruct.PLL.PLLMUL      = RCC_PLL_MUL4;
  RCC_OscInitStruct.PLL.PLLDIV      = RCC_PLL_DIV2;
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct)!= HAL_OK)
  {
    /* Initialization Error */
    while(1); 
  }
  
  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_DIV1;  
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;  
  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_1)!= HAL_OK)
  {
    /* Initialization Error */
    while(1); 
  }
}
 
void HAL_I2C_MasterTxCpltCallback(I2C_HandleTypeDef *I2cHandle)
{
  BSP_LED_Toggle(LED3);
}
 
void HAL_I2C_MasterRxCpltCallback(I2C_HandleTypeDef *I2cHandle)
{
  BSP_LED_Toggle(LED3);
}
 
void HAL_I2C_ErrorCallback(I2C_HandleTypeDef *I2cHandle)
{
  if (HAL_I2C_GetError(I2cHandle) != HAL_I2C_ERROR_AF)
  {
    Error_Handler();
  }
}
 
static void Error_Handler(void)
{
    while(1)
    {
      BSP_LED_Toggle(LED3);
      HAL_Delay(1000);
    }
}

HAL_I2C_Mem_Read is not returning HAL_OK and starts blinking LED3 from Error_Handler().

Please advice, thank you!

[hbhim]

Hi,

I am trying HAL_I2C_Mem_Read_DMA sample code as mentioned below. HAL_I2C_GetError is returns some value other then HAL_I2C_ERROR_AF (Line no 148)

#include "main.h"
#define MASTER_BOARD
#define I2C_ADDRESS        0x78
 
#define I2C_TIMING      0x00B1112E /* 400 kHz with analog Filter ON, Rise Time 250ns, Fall Time 100ns */
 
I2C_HandleTypeDef I2cHandle;
 
uint8_t aTxBuffer[] = " ****I2C_TwoBoards communication based on DMA****  ****I2C_TwoBoards communication based on DMA****  ****I2C_TwoBoards communication based on DMA**** ";
 
uint8_t aRxBuffer[RXBUFFERSIZE];
 
void SystemClock_Config(void);
static uint16_t Buffercmp(uint8_t* pBuffer1, uint8_t* pBuffer2, uint16_t BufferLength);
static void Error_Handler(void);
 
int main(void)
{
#ifdef MASTER_BOARD
  GPIO_InitTypeDef  GPIO_InitStruct;
 
#endif
  HAL_Init();
  
  SystemClock_Config();
 
  BSP_LED_Init(LED3);
 
  I2cHandle.Instance              = I2Cx;
  I2cHandle.Init.Timing           = I2C_TIMING;
  I2cHandle.Init.AddressingMode   = I2C_ADDRESSINGMODE_7BIT;
  I2cHandle.Init.DualAddressMode  = I2C_DUALADDRESS_DISABLE;
  I2cHandle.Init.OwnAddress2Masks = I2C_OA2_NOMASK;
  I2cHandle.Init.GeneralCallMode  = I2C_GENERALCALL_DISABLE;
  I2cHandle.Init.NoStretchMode    = I2C_NOSTRETCH_DISABLE;  
  I2cHandle.Init.OwnAddress1      = I2C_ADDRESS;
  I2cHandle.Init.OwnAddress2      = 0xFF;
  
  if(HAL_I2C_Init(&I2cHandle) != HAL_OK)
  {
    Error_Handler();
  }
 
  HAL_I2CEx_ConfigAnalogFilter(&I2cHandle,I2C_ANALOGFILTER_ENABLE);
 
#ifdef MASTER_BOARD
 
  GPIO_InitStruct.Pin = GPIO_PIN_12;
  GPIO_InitStruct.Pull = GPIO_PULLUP;
  GPIO_InitStruct.Mode = GPIO_MODE_INPUT; 
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
    
  __HAL_RCC_GPIOA_CLK_ENABLE();
 
  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
 
  GPIO_InitStruct.Pin = GPIO_PIN_8;
  GPIO_InitStruct.Pull = GPIO_PULLUP;
  GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
 
  __HAL_RCC_GPIOA_CLK_ENABLE();
 
  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
 
  HAL_GPIO_WritePin(GPIOA, GPIO_PIN_12, GPIO_PIN_SET);
  HAL_GPIO_WritePin(GPIOA, GPIO_PIN_8, GPIO_PIN_SET);
 
  HAL_Delay(1000);
 
  do
  {
	if(HAL_I2C_Mem_Read_DMA(&I2cHandle, (uint16_t)I2C_ADDRESS, 0x00, 1, (uint8_t *)aRxBuffer, 1) != HAL_OK)
    {
      Error_Handler();
    }
 
    while (HAL_I2C_GetState(&I2cHandle) != HAL_I2C_STATE_READY)
    {
    } 
 
  }
  while(HAL_I2C_GetError(&I2cHandle) == HAL_I2C_ERROR_AF);
 
#endif /* MASTER_BOARD */
 
  while (HAL_I2C_GetState(&I2cHandle) != HAL_I2C_STATE_READY)
  {
  } 
  
  if(Buffercmp("01",(uint8_t*)aRxBuffer,1))
  {
    Error_Handler();
  }
 
  while (1)
  {
  }
}
 
void SystemClock_Config(void)
{
  RCC_ClkInitTypeDef RCC_ClkInitStruct ={0};
  RCC_OscInitTypeDef RCC_OscInitStruct = {0};
  
  __HAL_RCC_PWR_CLK_ENABLE();
  
  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
  
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
  RCC_OscInitStruct.HSIState = RCC_HSI_ON;
  RCC_OscInitStruct.PLL.PLLSource   = RCC_PLLSOURCE_HSI;
  RCC_OscInitStruct.PLL.PLLState    = RCC_PLL_ON;
  RCC_OscInitStruct.PLL.PLLMUL      = RCC_PLL_MUL4;
  RCC_OscInitStruct.PLL.PLLDIV      = RCC_PLL_DIV2;
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct)!= HAL_OK)
  {
    while(1); 
  }
  
  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_DIV1;  
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;  
  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_1)!= HAL_OK)
  {
    while(1); 
  }
}
 
void HAL_I2C_MasterTxCpltCallback(I2C_HandleTypeDef *I2cHandle)
{
  BSP_LED_Toggle(LED3);
}
 
 
#ifdef MASTER_BOARD
void HAL_I2C_MasterRxCpltCallback(I2C_HandleTypeDef *I2cHandle)
{
  /* Toggle LED3: Transfer in reception process is correct */
  BSP_LED_Toggle(LED3);
}
 
 
void HAL_I2C_ErrorCallback(I2C_HandleTypeDef *I2cHandle)
{
  if (HAL_I2C_GetError(I2cHandle) != HAL_I2C_ERROR_AF)
  {
    Error_Handler();
  }
}
 
static void Error_Handler(void)
{
  while(1)
  {    
    BSP_LED_Toggle(LED3); 
    HAL_Delay(1000);
  } 
}
 
static uint16_t Buffercmp(uint8_t* pBuffer1, uint8_t* pBuffer2, uint16_t BufferLength)
{
  while (BufferLength--)
  {
    if ((*pBuffer1) != *pBuffer2)
    {
      return BufferLength;
    }
    pBuffer1++;
    pBuffer2++;
  }
 
  return 0;
}
 
#endif

[hbhim]

Resolved the issue. Actually it was a problem with I2C slave device. It is not allowing me to read the register value. Writing register is working fine using HAL_I2C_Mem_Write_DMA.

Thank you for all your help.