static HAL_StatusTypeDef I2C_Master_ISR_DMA()

in CMake-armcc/Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_i2c.c [4903:5028]

• 89 lines of code
• 17 McCabe index (conditional complexity)

static HAL_StatusTypeDef I2C_Master_ISR_DMA(struct __I2C_HandleTypeDef *hi2c, uint32_t ITFlags, uint32_t ITSources)
{
  uint16_t devaddress;
  uint32_t xfermode;

  /* Process Locked */
  __HAL_LOCK(hi2c);

  if ((I2C_CHECK_FLAG(ITFlags, I2C_FLAG_AF) != RESET) && (I2C_CHECK_IT_SOURCE(ITSources, I2C_IT_NACKI) != RESET))
  {
    /* Clear NACK Flag */
    __HAL_I2C_CLEAR_FLAG(hi2c, I2C_FLAG_AF);

    /* Set corresponding Error Code */
    hi2c->ErrorCode |= HAL_I2C_ERROR_AF;

    /* No need to generate STOP, it is automatically done */
    /* But enable STOP interrupt, to treat it */
    /* Error callback will be send during stop flag treatment */
    I2C_Enable_IRQ(hi2c, I2C_XFER_CPLT_IT);

    /* Flush TX register */
    I2C_Flush_TXDR(hi2c);
  }
  else if ((I2C_CHECK_FLAG(ITFlags, I2C_FLAG_TCR) != RESET) && (I2C_CHECK_IT_SOURCE(ITSources, I2C_IT_TCI) != RESET))
  {
    /* Disable TC interrupt */
    __HAL_I2C_DISABLE_IT(hi2c, I2C_IT_TCI);

    if (hi2c->XferCount != 0U)
    {
      /* Recover Slave address */
      devaddress = (uint16_t)(hi2c->Instance->CR2 & I2C_CR2_SADD);

      /* Prepare the new XferSize to transfer */
      if (hi2c->XferCount > MAX_NBYTE_SIZE)
      {
        hi2c->XferSize = MAX_NBYTE_SIZE;
        xfermode = I2C_RELOAD_MODE;
      }
      else
      {
        hi2c->XferSize = hi2c->XferCount;
        if (hi2c->XferOptions != I2C_NO_OPTION_FRAME)
        {
          xfermode = hi2c->XferOptions;
        }
        else
        {
          xfermode = I2C_AUTOEND_MODE;
        }
      }

      /* Set the new XferSize in Nbytes register */
      I2C_TransferConfig(hi2c, devaddress, (uint8_t)hi2c->XferSize, xfermode, I2C_NO_STARTSTOP);

      /* Update XferCount value */
      hi2c->XferCount -= hi2c->XferSize;

      /* Enable DMA Request */
      if (hi2c->State == HAL_I2C_STATE_BUSY_RX)
      {
        hi2c->Instance->CR1 |= I2C_CR1_RXDMAEN;
      }
      else
      {
        hi2c->Instance->CR1 |= I2C_CR1_TXDMAEN;
      }
    }
    else
    {
      /* Call TxCpltCallback() if no stop mode is set */
      if (I2C_GET_STOP_MODE(hi2c) != I2C_AUTOEND_MODE)
      {
        /* Call I2C Master Sequential complete process */
        I2C_ITMasterSeqCplt(hi2c);
      }
      else
      {
        /* Wrong size Status regarding TCR flag event */
        /* Call the corresponding callback to inform upper layer of End of Transfer */
        I2C_ITError(hi2c, HAL_I2C_ERROR_SIZE);
      }
    }
  }
  else if ((I2C_CHECK_FLAG(ITFlags, I2C_FLAG_TC) != RESET) && (I2C_CHECK_IT_SOURCE(ITSources, I2C_IT_TCI) != RESET))
  {
    if (hi2c->XferCount == 0U)
    {
      if (I2C_GET_STOP_MODE(hi2c) != I2C_AUTOEND_MODE)
      {
        /* Generate a stop condition in case of no transfer option */
        if (hi2c->XferOptions == I2C_NO_OPTION_FRAME)
        {
          /* Generate Stop */
          hi2c->Instance->CR2 |= I2C_CR2_STOP;
        }
        else
        {
          /* Call I2C Master Sequential complete process */
          I2C_ITMasterSeqCplt(hi2c);
        }
      }
    }
    else
    {
      /* Wrong size Status regarding TC flag event */
      /* Call the corresponding callback to inform upper layer of End of Transfer */
      I2C_ITError(hi2c, HAL_I2C_ERROR_SIZE);
    }
  }
  else if ((I2C_CHECK_FLAG(ITFlags, I2C_FLAG_STOPF) != RESET) && (I2C_CHECK_IT_SOURCE(ITSources, I2C_IT_STOPI) != RESET))
  {
    /* Call I2C Master complete process */
    I2C_ITMasterCplt(hi2c, ITFlags);
  }
  else
  {
    /* Nothing to do */
  }

  /* Process Unlocked */
  __HAL_UNLOCK(hi2c);

  return HAL_OK;
}