static HAL_StatusTypeDef I2C_Slave_ISR_IT()

in CMake-armcc/Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_i2c.c [4768:4893]

• 81 lines of code
• 24 McCabe index (conditional complexity)

static HAL_StatusTypeDef I2C_Slave_ISR_IT(struct __I2C_HandleTypeDef *hi2c, uint32_t ITFlags, uint32_t ITSources)
{
  uint32_t tmpoptions = hi2c->XferOptions;
  uint32_t tmpITFlags = ITFlags;

  /* Process locked */
  __HAL_LOCK(hi2c);

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

  if ((I2C_CHECK_FLAG(tmpITFlags, 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 (hi2c->XferCount == 0U)
    {
      /* 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, tmpITFlags);
      }
      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;

      if ((tmpoptions == I2C_FIRST_FRAME) || (tmpoptions == I2C_NEXT_FRAME))
      {
        /* Call the corresponding callback to inform upper layer of End of Transfer */
        I2C_ITError(hi2c, hi2c->ErrorCode);
      }
    }
  }
  else if ((I2C_CHECK_FLAG(tmpITFlags, I2C_FLAG_RXNE) != RESET) && (I2C_CHECK_IT_SOURCE(ITSources, I2C_IT_RXI) != RESET))
  {
    if (hi2c->XferCount > 0U)
    {
      /* Read data from RXDR */
      *hi2c->pBuffPtr = (uint8_t)hi2c->Instance->RXDR;

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

      hi2c->XferSize--;
      hi2c->XferCount--;
    }

    if ((hi2c->XferCount == 0U) && \
        (tmpoptions != I2C_NO_OPTION_FRAME))
    {
      /* Call I2C Slave Sequential complete process */
      I2C_ITSlaveSeqCplt(hi2c);
    }
  }
  else if ((I2C_CHECK_FLAG(tmpITFlags, I2C_FLAG_ADDR) != RESET) && \
           (I2C_CHECK_IT_SOURCE(ITSources, I2C_IT_ADDRI) != RESET))
  {
    I2C_ITAddrCplt(hi2c, tmpITFlags);
  }
  else if ((I2C_CHECK_FLAG(tmpITFlags, I2C_FLAG_TXIS) != RESET) && (I2C_CHECK_IT_SOURCE(ITSources, I2C_IT_TXI) != RESET))
  {
    /* Write data to TXDR only if XferCount not reach "0" */
    /* A TXIS flag can be set, during STOP treatment      */
    /* Check if all data have already been sent */
    /* If it is the case, this last write in TXDR is not sent, correspond to a dummy TXIS event */
    if (hi2c->XferCount > 0U)
    {
      /* Write data to TXDR */
      hi2c->Instance->TXDR = *hi2c->pBuffPtr;

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

      hi2c->XferCount--;
      hi2c->XferSize--;
    }
    else
    {
      if ((tmpoptions == I2C_NEXT_FRAME) || (tmpoptions == I2C_FIRST_FRAME))
      {
        /* Last Byte is Transmitted */
        /* Call I2C Slave Sequential complete process */
        I2C_ITSlaveSeqCplt(hi2c);
      }
    }
  }
  else
  {
    /* Nothing to do */
  }

  /* Process Unlocked */
  __HAL_UNLOCK(hi2c);

  return HAL_OK;
}