HAL_StatusTypeDef HAL_I2C_Slave_Transmit()

in CMake-armcc/Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_i2c.c [1297:1423]

• 79 lines of code
• 13 McCabe index (conditional complexity)

HAL_StatusTypeDef HAL_I2C_Slave_Transmit(I2C_HandleTypeDef *hi2c, uint8_t *pData, uint16_t Size, uint32_t Timeout)
{
  uint32_t tickstart;

  if (hi2c->State == HAL_I2C_STATE_READY)
  {
    if ((pData == NULL) || (Size == 0U))
    {
      hi2c->ErrorCode = HAL_I2C_ERROR_INVALID_PARAM;
      return  HAL_ERROR;
    }
    /* Process Locked */
    __HAL_LOCK(hi2c);

    /* Init tickstart for timeout management*/
    tickstart = HAL_GetTick();

    hi2c->State     = HAL_I2C_STATE_BUSY_TX;
    hi2c->Mode      = HAL_I2C_MODE_SLAVE;
    hi2c->ErrorCode = HAL_I2C_ERROR_NONE;

    /* Prepare transfer parameters */
    hi2c->pBuffPtr  = pData;
    hi2c->XferCount = Size;
    hi2c->XferISR   = NULL;

    /* Enable Address Acknowledge */
    hi2c->Instance->CR2 &= ~I2C_CR2_NACK;

    /* Wait until ADDR flag is set */
    if (I2C_WaitOnFlagUntilTimeout(hi2c, I2C_FLAG_ADDR, RESET, Timeout, tickstart) != HAL_OK)
    {
      /* Disable Address Acknowledge */
      hi2c->Instance->CR2 |= I2C_CR2_NACK;
      return HAL_ERROR;
    }

    /* Clear ADDR flag */
    __HAL_I2C_CLEAR_FLAG(hi2c, I2C_FLAG_ADDR);

    /* If 10bit addressing mode is selected */
    if (hi2c->Init.AddressingMode == I2C_ADDRESSINGMODE_10BIT)
    {
      /* Wait until ADDR flag is set */
      if (I2C_WaitOnFlagUntilTimeout(hi2c, I2C_FLAG_ADDR, RESET, Timeout, tickstart) != HAL_OK)
      {
        /* Disable Address Acknowledge */
        hi2c->Instance->CR2 |= I2C_CR2_NACK;
        return HAL_ERROR;
      }

      /* Clear ADDR flag */
      __HAL_I2C_CLEAR_FLAG(hi2c, I2C_FLAG_ADDR);
    }

    /* Wait until DIR flag is set Transmitter mode */
    if (I2C_WaitOnFlagUntilTimeout(hi2c, I2C_FLAG_DIR, RESET, Timeout, tickstart) != HAL_OK)
    {
      /* Disable Address Acknowledge */
      hi2c->Instance->CR2 |= I2C_CR2_NACK;
      return HAL_ERROR;
    }

    while (hi2c->XferCount > 0U)
    {
      /* Wait until TXIS flag is set */
      if (I2C_WaitOnTXISFlagUntilTimeout(hi2c, Timeout, tickstart) != HAL_OK)
      {
        /* Disable Address Acknowledge */
        hi2c->Instance->CR2 |= I2C_CR2_NACK;
        return HAL_ERROR;
      }

      /* Write data to TXDR */
      hi2c->Instance->TXDR = *hi2c->pBuffPtr;

      /* Increment Buffer pointer */
      hi2c->pBuffPtr++;

      hi2c->XferCount--;
    }

    /* Wait until STOP flag is set */
    if (I2C_WaitOnSTOPFlagUntilTimeout(hi2c, Timeout, tickstart) != HAL_OK)
    {
      /* Disable Address Acknowledge */
      hi2c->Instance->CR2 |= I2C_CR2_NACK;

      if (hi2c->ErrorCode == HAL_I2C_ERROR_AF)
      {
        /* Normal use case for Transmitter mode */
        /* A NACK is generated to confirm the end of transfer */
        hi2c->ErrorCode = HAL_I2C_ERROR_NONE;
      }
      else
      {
        return HAL_ERROR;
      }
    }

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

    /* Wait until BUSY flag is reset */
    if (I2C_WaitOnFlagUntilTimeout(hi2c, I2C_FLAG_BUSY, SET, Timeout, tickstart) != HAL_OK)
    {
      /* Disable Address Acknowledge */
      hi2c->Instance->CR2 |= I2C_CR2_NACK;
      return HAL_ERROR;
    }

    /* Disable Address Acknowledge */
    hi2c->Instance->CR2 |= I2C_CR2_NACK;

    hi2c->State = HAL_I2C_STATE_READY;
    hi2c->Mode  = HAL_I2C_MODE_NONE;

    /* Process Unlocked */
    __HAL_UNLOCK(hi2c);

    return HAL_OK;
  }
  else
  {
    return HAL_BUSY;
  }
}