static HAL_StatusTypeDef I2C_Slave_ISR_DMA()

in CMake-armcc/Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_i2c.c [5038:5164]

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

static HAL_StatusTypeDef I2C_Slave_ISR_DMA(struct __I2C_HandleTypeDef *hi2c, uint32_t ITFlags, uint32_t ITSources)
{
  uint32_t tmpoptions = hi2c->XferOptions;
  uint32_t treatdmanack = 0U;
  HAL_I2C_StateTypeDef tmpstate;

  /* Process locked */
  __HAL_LOCK(hi2c);

  /* Check if STOPF is set */
  if ((I2C_CHECK_FLAG(ITFlags, I2C_FLAG_STOPF) != RESET) && (I2C_CHECK_IT_SOURCE(ITSources, I2C_IT_STOPI) != RESET))
  {
    /* Call I2C Slave complete process */
    I2C_ITSlaveCplt(hi2c, ITFlags);
  }

  if ((I2C_CHECK_FLAG(ITFlags, I2C_FLAG_AF) != RESET) && (I2C_CHECK_IT_SOURCE(ITSources, I2C_IT_NACKI) != RESET))
  {
    /* Check that I2C transfer finished */
    /* if yes, normal use case, a NACK is sent by the MASTER when Transfer is finished */
    /* Mean XferCount == 0 */
    /* So clear Flag NACKF only */
    if ((I2C_CHECK_IT_SOURCE(ITSources, I2C_CR1_TXDMAEN) != RESET) ||
        (I2C_CHECK_IT_SOURCE(ITSources, I2C_CR1_RXDMAEN) != RESET))
    {
      /* Split check of hdmarx, for MISRA compliance */
      if (hi2c->hdmarx != NULL)
      {
        if (I2C_CHECK_IT_SOURCE(ITSources, I2C_CR1_RXDMAEN) != RESET)
        {
          if (__HAL_DMA_GET_COUNTER(hi2c->hdmarx) == 0U)
          {
            treatdmanack = 1U;
          }
        }
      }

      /* Split check of hdmatx, for MISRA compliance  */
      if (hi2c->hdmatx != NULL)
      {
        if (I2C_CHECK_IT_SOURCE(ITSources, I2C_CR1_TXDMAEN) != RESET)
        {
          if (__HAL_DMA_GET_COUNTER(hi2c->hdmatx) == 0U)
          {
            treatdmanack = 1U;
          }
        }
      }

      if (treatdmanack == 1U)
      {
        /* Same action must be done for (tmpoptions == I2C_LAST_FRAME) which removed for Warning[Pa134]: left and right operands are identical */
        if ((hi2c->State == HAL_I2C_STATE_LISTEN) && (tmpoptions == I2C_FIRST_AND_LAST_FRAME))
        {
          /* Call I2C Listen complete process */
          I2C_ITListenCplt(hi2c, ITFlags);
        }
        else if ((hi2c->State == HAL_I2C_STATE_BUSY_TX_LISTEN) && (tmpoptions != I2C_NO_OPTION_FRAME))
        {
          /* Clear NACK Flag */
          __HAL_I2C_CLEAR_FLAG(hi2c, I2C_FLAG_AF);

          /* Flush TX register */
          I2C_Flush_TXDR(hi2c);

          /* Last Byte is Transmitted */
          /* Call I2C Slave Sequential complete process */
          I2C_ITSlaveSeqCplt(hi2c);
        }
        else
        {
          /* Clear NACK Flag */
          __HAL_I2C_CLEAR_FLAG(hi2c, I2C_FLAG_AF);
        }
      }
      else
      {
        /* if no, error use case, a Non-Acknowledge of last Data is generated by the MASTER*/
        /* Clear NACK Flag */
        __HAL_I2C_CLEAR_FLAG(hi2c, I2C_FLAG_AF);

        /* Set ErrorCode corresponding to a Non-Acknowledge */
        hi2c->ErrorCode |= HAL_I2C_ERROR_AF;

        /* Store current hi2c->State, solve MISRA2012-Rule-13.5 */
        tmpstate = hi2c->State;

        if ((tmpoptions == I2C_FIRST_FRAME) || (tmpoptions == I2C_NEXT_FRAME))
        {
          if ((tmpstate == HAL_I2C_STATE_BUSY_TX) || (tmpstate == HAL_I2C_STATE_BUSY_TX_LISTEN))
          {
            hi2c->PreviousState = I2C_STATE_SLAVE_BUSY_TX;
          }
          else if ((tmpstate == HAL_I2C_STATE_BUSY_RX) || (tmpstate == HAL_I2C_STATE_BUSY_RX_LISTEN))
          {
            hi2c->PreviousState = I2C_STATE_SLAVE_BUSY_RX;
          }
          else
          {
            /* Do nothing */
          }

          /* Call the corresponding callback to inform upper layer of End of Transfer */
          I2C_ITError(hi2c, hi2c->ErrorCode);
        }
      }
    }
    else
    {
      /* Only Clear NACK Flag, no DMA treatment is pending */
      __HAL_I2C_CLEAR_FLAG(hi2c, I2C_FLAG_AF);
    }
  }
  else if ((I2C_CHECK_FLAG(ITFlags, I2C_FLAG_ADDR) != RESET) && (I2C_CHECK_IT_SOURCE(ITSources, I2C_IT_ADDRI) != RESET))
  {
    I2C_ITAddrCplt(hi2c, ITFlags);
  }
  else
  {
    /* Nothing to do */
  }

  /* Process Unlocked */
  __HAL_UNLOCK(hi2c);

  return HAL_OK;
}