Quelltext

HAL_StatusTypeDef HAL_I2C_Master_Transmit(I2C_HandleTypeDef *hi2c, uint16_t DevAddress, uint8_t *pData, uint16_t Size, uint32_t Timeout)
{
  uint32_t sizetmp = 0;

  if(hi2c->State == HAL_I2C_STATE_READY)
  {
    if((pData == NULL ) || (Size == 0))
    {
      return  HAL_ERROR;
    }

    if(__HAL_I2C_GET_FLAG(hi2c, I2C_FLAG_BUSY) == SET)
    {
      return HAL_BUSY;
    }

    /* Process Locked */
    __HAL_LOCK(hi2c);

    hi2c->State = HAL_I2C_STATE_MASTER_BUSY_TX;
    hi2c->ErrorCode   = HAL_I2C_ERROR_NONE;

    /* Send Slave Address */
    /* Set NBYTES to write and reload if size > 255 and generate RESTART */
    /* Size > 255, need to set RELOAD bit */
    if(Size > 255)
    {
      I2C_TransferConfig(hi2c,DevAddress,255, I2C_RELOAD_MODE, I2C_GENERATE_START_WRITE);
      sizetmp = 255;
    }
    else
    {
      I2C_TransferConfig(hi2c,DevAddress,Size, I2C_AUTOEND_MODE, I2C_GENERATE_START_WRITE);
      sizetmp = Size;
    }

    do
    {
      /* Wait until TXIS flag is set */
      if(I2C_WaitOnTXISFlagUntilTimeout(hi2c, Timeout) != HAL_OK)
      {
        if(hi2c->ErrorCode == HAL_I2C_ERROR_AF)
        {
          return HAL_ERROR;
        }
        else
        {
          return HAL_TIMEOUT;
        }
      }
      /* Write data to TXDR */
      hi2c->Instance->TXDR = (*pData++);
      sizetmp--;
      Size--;

      if((sizetmp == 0)&&(Size!=0))
      {
        /* Wait until TXE flag is set */
        if(I2C_WaitOnFlagUntilTimeout(hi2c, I2C_FLAG_TCR, RESET, Timeout) != HAL_OK)
        {
          return HAL_TIMEOUT;
        }

        if(Size > 255)
        {
          I2C_TransferConfig(hi2c,DevAddress,255, I2C_RELOAD_MODE, I2C_NO_STARTSTOP);
          sizetmp = 255;
        }
        else
        {
          I2C_TransferConfig(hi2c,DevAddress,Size, I2C_AUTOEND_MODE, I2C_NO_STARTSTOP);
          sizetmp = Size;
        }
      }

    }while(Size > 0);

    /* No need to Check TC flag, with AUTOEND mode the stop is automatically generated */
    /* Wait until STOPF flag is set */
    if(I2C_WaitOnSTOPFlagUntilTimeout(hi2c, Timeout) != HAL_OK)
    {
      if(hi2c->ErrorCode == HAL_I2C_ERROR_AF)
      {
        return HAL_ERROR;
      }
      else
      {
        return HAL_TIMEOUT;
      }
    }

    /* Clear STOP Flag */
    __HAL_I2C_CLEAR_FLAG(hi2c, I2C_FLAG_STOPF);

    /* Clear Configuration Register 2 */
    __HAL_I2C_RESET_CR2(hi2c);

    hi2c->State = HAL_I2C_STATE_READY;

    /* Process Unlocked */
    __HAL_UNLOCK(hi2c);

    return HAL_OK;
  }
  else
  {
    return HAL_BUSY;
  }
}