HAL_StatusTypeDef HAL_I2C_Slave_Seq_Receive_DMA()

in CMake-armcc/Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_i2c.c [4038:4206]

• 100 lines of code
• 15 McCabe index (conditional complexity)

HAL_StatusTypeDef HAL_I2C_Slave_Seq_Receive_DMA(I2C_HandleTypeDef *hi2c, uint8_t *pData, uint16_t Size,
                                                uint32_t XferOptions)
{
  HAL_StatusTypeDef dmaxferstatus;

  /* Check the parameters */
  assert_param(IS_I2C_TRANSFER_OPTIONS_REQUEST(XferOptions));

  if (((uint32_t)hi2c->State & (uint32_t)HAL_I2C_STATE_LISTEN) == (uint32_t)HAL_I2C_STATE_LISTEN)
  {
    if ((pData == NULL) || (Size == 0U))
    {
      hi2c->ErrorCode = HAL_I2C_ERROR_INVALID_PARAM;
      return  HAL_ERROR;
    }

    /* Disable Interrupts, to prevent preemption during treatment in case of multicall */
    I2C_Disable_IRQ(hi2c, I2C_XFER_LISTEN_IT | I2C_XFER_RX_IT);

    /* Process Locked */
    __HAL_LOCK(hi2c);

    /* I2C cannot manage full duplex exchange so disable previous IT enabled if any */
    /* and then toggle the HAL slave TX state to RX state */
    if (hi2c->State == HAL_I2C_STATE_BUSY_TX_LISTEN)
    {
      /* Disable associated Interrupts */
      I2C_Disable_IRQ(hi2c, I2C_XFER_TX_IT);

      if ((hi2c->Instance->CR1 & I2C_CR1_TXDMAEN) == I2C_CR1_TXDMAEN)
      {
        /* Abort DMA Xfer if any */
        if (hi2c->hdmatx != NULL)
        {
          hi2c->Instance->CR1 &= ~I2C_CR1_TXDMAEN;

          /* Set the I2C DMA Abort callback :
           will lead to call HAL_I2C_ErrorCallback() at end of DMA abort procedure */
          hi2c->hdmatx->XferAbortCallback = I2C_DMAAbort;

          /* Abort DMA TX */
          if (HAL_DMA_Abort_IT(hi2c->hdmatx) != HAL_OK)
          {
            /* Call Directly XferAbortCallback function in case of error */
            hi2c->hdmatx->XferAbortCallback(hi2c->hdmatx);
          }
        }
      }
    }
    else if (hi2c->State == HAL_I2C_STATE_BUSY_RX_LISTEN)
    {
      if ((hi2c->Instance->CR1 & I2C_CR1_RXDMAEN) == I2C_CR1_RXDMAEN)
      {
        hi2c->Instance->CR1 &= ~I2C_CR1_RXDMAEN;

        /* Abort DMA Xfer if any */
        if (hi2c->hdmarx != NULL)
        {
          /* Set the I2C DMA Abort callback :
           will lead to call HAL_I2C_ErrorCallback() at end of DMA abort procedure */
          hi2c->hdmarx->XferAbortCallback = I2C_DMAAbort;

          /* Abort DMA RX */
          if (HAL_DMA_Abort_IT(hi2c->hdmarx) != HAL_OK)
          {
            /* Call Directly XferAbortCallback function in case of error */
            hi2c->hdmarx->XferAbortCallback(hi2c->hdmarx);
          }
        }
      }
    }
    else
    {
      /* Nothing to do */
    }

    hi2c->State     = HAL_I2C_STATE_BUSY_RX_LISTEN;
    hi2c->Mode      = HAL_I2C_MODE_SLAVE;
    hi2c->ErrorCode = HAL_I2C_ERROR_NONE;

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

    /* Prepare transfer parameters */
    hi2c->pBuffPtr    = pData;
    hi2c->XferCount   = Size;
    hi2c->XferSize    = hi2c->XferCount;
    hi2c->XferOptions = XferOptions;
    hi2c->XferISR     = I2C_Slave_ISR_DMA;

    if (hi2c->hdmarx != NULL)
    {
      /* Set the I2C DMA transfer complete callback */
      hi2c->hdmarx->XferCpltCallback = I2C_DMASlaveReceiveCplt;

      /* Set the DMA error callback */
      hi2c->hdmarx->XferErrorCallback = I2C_DMAError;

      /* Set the unused DMA callbacks to NULL */
      hi2c->hdmarx->XferHalfCpltCallback = NULL;
      hi2c->hdmarx->XferAbortCallback = NULL;

      /* Enable the DMA channel */
      dmaxferstatus = HAL_DMA_Start_IT(hi2c->hdmarx, (uint32_t)&hi2c->Instance->RXDR, (uint32_t)pData, hi2c->XferSize);
    }
    else
    {
      /* Update I2C state */
      hi2c->State     = HAL_I2C_STATE_LISTEN;
      hi2c->Mode      = HAL_I2C_MODE_NONE;

      /* Update I2C error code */
      hi2c->ErrorCode |= HAL_I2C_ERROR_DMA_PARAM;

      /* Process Unlocked */
      __HAL_UNLOCK(hi2c);

      return HAL_ERROR;
    }

    if (dmaxferstatus == HAL_OK)
    {
      /* Update XferCount value */
      hi2c->XferCount -= hi2c->XferSize;

      /* Reset XferSize */
      hi2c->XferSize = 0;
    }
    else
    {
      /* Update I2C state */
      hi2c->State     = HAL_I2C_STATE_LISTEN;
      hi2c->Mode      = HAL_I2C_MODE_NONE;

      /* Update I2C error code */
      hi2c->ErrorCode |= HAL_I2C_ERROR_DMA;

      /* Process Unlocked */
      __HAL_UNLOCK(hi2c);

      return HAL_ERROR;
    }

    if (I2C_GET_DIR(hi2c) == I2C_DIRECTION_TRANSMIT)
    {
      /* Clear ADDR flag after prepare the transfer parameters */
      /* This action will generate an acknowledge to the Master */
      __HAL_I2C_CLEAR_FLAG(hi2c, I2C_FLAG_ADDR);
    }

    /* Process Unlocked */
    __HAL_UNLOCK(hi2c);

    /* Note : The I2C interrupts must be enabled after unlocking current process
    to avoid the risk of I2C interrupt handle execution before current
    process unlock */
    /* REnable ADDR interrupt */
    I2C_Enable_IRQ(hi2c, I2C_XFER_RX_IT | I2C_XFER_LISTEN_IT);

    /* Enable DMA Request */
    hi2c->Instance->CR1 |= I2C_CR1_RXDMAEN;

    return HAL_OK;
  }
  else
  {
    return HAL_ERROR;
  }
}