text: /*
   * The Clear BSD License
   * Copyright (c) 2015-2016, Freescale Semiconductor, Inc.
   * Copyright 2016-2017 NXP
   * All rights reserved.
   * 
   * Redistribution and use in source and binary forms, with or without modification,
   * are permitted (subject to the limitations in the disclaimer below) provided
   *  that the following conditions are met:
   *
   * o Redistributions of source code must retain the above copyright notice, this list
   *   of conditions and the following disclaimer.
   *
   * o Redistributions in binary form must reproduce the above copyright notice, this
   *   list of conditions and the following disclaimer in the documentation and/or
   *   other materials provided with the distribution.
   *
   * o Neither the name of the copyright holder nor the names of its
   *   contributors may be used to endorse or promote products derived from this
   *   software without specific prior written permission.
   *
   * NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE GRANTED BY THIS LICENSE.
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
   * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
   * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
   * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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   * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
   * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  #ifndef _FSL_FLEXIO_UART_H_
  #define _FSL_FLEXIO_UART_H_
  
  #include "fsl_common.h"
  #include "fsl_flexio.h"
  
  /*!
   * @addtogroup flexio_uart
   * @{
   */
  
  /*******************************************************************************
   * Definitions
   ******************************************************************************/
  
  /*! @name Driver version */
  /*@{*/
  /*! @brief FlexIO UART driver version 2.1.4. */
  #define FSL_FLEXIO_UART_DRIVER_VERSION (MAKE_VERSION(2, 1, 4))
  /*@}*/
  
  /*! @brief Error codes for the UART driver. */
  enum _flexio_uart_status
  {
      kStatus_FLEXIO_UART_TxBusy = MAKE_STATUS(kStatusGroup_FLEXIO_UART, 0), /*!< Transmitter is busy. */
      kStatus_FLEXIO_UART_RxBusy = MAKE_STATUS(kStatusGroup_FLEXIO_UART, 1), /*!< Receiver is busy. */
      kStatus_FLEXIO_UART_TxIdle = MAKE_STATUS(kStatusGroup_FLEXIO_UART, 2), /*!< UART transmitter is idle. */
      kStatus_FLEXIO_UART_RxIdle = MAKE_STATUS(kStatusGroup_FLEXIO_UART, 3), /*!< UART receiver is idle. */
      kStatus_FLEXIO_UART_ERROR = MAKE_STATUS(kStatusGroup_FLEXIO_UART, 4),  /*!< ERROR happens on UART. */
      kStatus_FLEXIO_UART_RxRingBufferOverrun =
          MAKE_STATUS(kStatusGroup_FLEXIO_UART, 5), /*!< UART RX software ring buffer overrun. */
      kStatus_FLEXIO_UART_RxHardwareOverrun = MAKE_STATUS(kStatusGroup_FLEXIO_UART, 6) /*!< UART RX receiver overrun. */
  };
  
  /*! @brief FlexIO UART bit count per char. */
  typedef enum _flexio_uart_bit_count_per_char
  {
      kFLEXIO_UART_7BitsPerChar = 7U, /*!< 7-bit data characters */
      kFLEXIO_UART_8BitsPerChar = 8U, /*!< 8-bit data characters */
      kFLEXIO_UART_9BitsPerChar = 9U, /*!< 9-bit data characters */
  } flexio_uart_bit_count_per_char_t;
  
  /*! @brief Define FlexIO UART interrupt mask. */
  enum _flexio_uart_interrupt_enable
  {
      kFLEXIO_UART_TxDataRegEmptyInterruptEnable = 0x1U, /*!< Transmit buffer empty interrupt enable. */
      kFLEXIO_UART_RxDataRegFullInterruptEnable = 0x2U,  /*!< Receive buffer full interrupt enable. */
  };
  
  /*! @brief Define FlexIO UART status mask. */
  enum _flexio_uart_status_flags
  {
      kFLEXIO_UART_TxDataRegEmptyFlag = 0x1U, /*!< Transmit buffer empty flag. */
      kFLEXIO_UART_RxDataRegFullFlag = 0x2U,  /*!< Receive buffer full flag. */
      kFLEXIO_UART_RxOverRunFlag = 0x4U,      /*!< Receive buffer over run flag. */
  };
  
  /*! @brief Define FlexIO UART access structure typedef. */
  typedef struct _flexio_uart_type
  {
      FLEXIO_Type *flexioBase; /*!< FlexIO base pointer. */
      uint8_t TxPinIndex;      /*!< Pin select for UART_Tx. */
      uint8_t RxPinIndex;      /*!< Pin select for UART_Rx. */
      uint8_t shifterIndex[2]; /*!< Shifter index used in FlexIO UART. */
      uint8_t timerIndex[2];   /*!< Timer index used in FlexIO UART. */
  } FLEXIO_UART_Type;
  
  /*! @brief Define FlexIO UART user configuration structure. */
  typedef struct _flexio_uart_config
  {
      bool enableUart;                                  /*!< Enable/disable FlexIO UART TX & RX. */
      bool enableInDoze;                                /*!< Enable/disable FlexIO operation in doze mode*/
      bool enableInDebug;                               /*!< Enable/disable FlexIO operation in debug mode*/
      bool enableFastAccess;                            /*!< Enable/disable fast access to FlexIO registers,
                                                         fast access requires the FlexIO clock to be at least
                                                         twice the frequency of the bus clock. */
      uint32_t baudRate_Bps;                            /*!< Baud rate in Bps. */
      flexio_uart_bit_count_per_char_t bitCountPerChar; /*!< number of bits, 7/8/9 -bit */
  } flexio_uart_config_t;
  
  /*! @brief Define FlexIO UART transfer structure. */
  typedef struct _flexio_uart_transfer
  {
      uint8_t *data;   /*!< Transfer buffer*/
      size_t dataSize; /*!< Transfer size*/
  } flexio_uart_transfer_t;
  
  /* Forward declaration of the handle typedef. */
  typedef struct _flexio_uart_handle flexio_uart_handle_t;
  
  /*! @brief FlexIO UART transfer callback function. */
  typedef void (*flexio_uart_transfer_callback_t)(FLEXIO_UART_Type *base,
                                                  flexio_uart_handle_t *handle,
                                                  status_t status,
                                                  void *userData);
  
  /*! @brief Define FLEXIO UART handle structure*/
  struct _flexio_uart_handle
  {
      uint8_t *volatile txData;   /*!< Address of remaining data to send. */
      volatile size_t txDataSize; /*!< Size of the remaining data to send. */
      uint8_t *volatile rxData;   /*!< Address of remaining data to receive. */
      volatile size_t rxDataSize; /*!< Size of the remaining data to receive. */
      size_t txDataSizeAll;       /*!< Total bytes to be sent. */
      size_t rxDataSizeAll;       /*!< Total bytes to be received. */
  
      uint8_t *rxRingBuffer;              /*!< Start address of the receiver ring buffer. */
      size_t rxRingBufferSize;            /*!< Size of the ring buffer. */
      volatile uint16_t rxRingBufferHead; /*!< Index for the driver to store received data into ring buffer. */
      volatile uint16_t rxRingBufferTail; /*!< Index for the user to get data from the ring buffer. */
  
      flexio_uart_transfer_callback_t callback; /*!< Callback function. */
      void *userData;                           /*!< UART callback function parameter.*/
  
      volatile uint8_t txState; /*!< TX transfer state. */
      volatile uint8_t rxState; /*!< RX transfer state */
  };
  
  /*******************************************************************************
   * API
   ******************************************************************************/
  
  #if defined(__cplusplus)
  extern "C" {
  #endif /*_cplusplus*/
  
  /*!
   * @name Initialization and deinitialization
   * @{
   */
  
  /*!
   * @brief Ungates the FlexIO clock, resets the FlexIO module, configures FlexIO UART
   * hardware, and configures the FlexIO UART with FlexIO UART configuration.
   * The configuration structure can be filled by the user or be set with
   * default values by FLEXIO_UART_GetDefaultConfig().
   *
   * Example
     @code
     FLEXIO_UART_Type base = {
     .flexioBase = FLEXIO,
     .TxPinIndex = 0,
     .RxPinIndex = 1,
     .shifterIndex = {0,1},
     .timerIndex = {0,1}
     };
     flexio_uart_config_t config = {
     .enableInDoze = false,
     .enableInDebug = true,
     .enableFastAccess = false,
     .baudRate_Bps = 115200U,
     .bitCountPerChar = 8
     };
     FLEXIO_UART_Init(base, &config, srcClock_Hz);
     @endcode
   *
   * @param base Pointer to the FLEXIO_UART_Type structure.
   * @param userConfig Pointer to the flexio_uart_config_t structure.
   * @param srcClock_Hz FlexIO source clock in Hz.
   * @retval kStatus_Success Configuration success
   * @retval kStatus_InvalidArgument Buadrate configuration out of range
  */
  status_t FLEXIO_UART_Init(FLEXIO_UART_Type *base, const flexio_uart_config_t *userConfig, uint32_t srcClock_Hz);
  
  /*!
   * @brief Resets the FlexIO UART shifter and timer config.
   *
   * @note After calling this API, call the FLEXO_UART_Init to use the FlexIO UART module.
   *
   * @param base Pointer to FLEXIO_UART_Type structure
  */
  void FLEXIO_UART_Deinit(FLEXIO_UART_Type *base);
  
  /*!
   * @brief Gets the default configuration to configure the FlexIO UART. The configuration
   * can be used directly for calling the FLEXIO_UART_Init().
   * Example:
     @code
     flexio_uart_config_t config;
     FLEXIO_UART_GetDefaultConfig(&userConfig);
     @endcode
   * @param userConfig Pointer to the flexio_uart_config_t structure.
  */
  void FLEXIO_UART_GetDefaultConfig(flexio_uart_config_t *userConfig);
  
  /* @} */
  
  /*!
   * @name Status
   * @{
   */
  
  /*!
   * @brief Gets the FlexIO UART status flags.
   *
   * @param base Pointer to the FLEXIO_UART_Type structure.
   * @return FlexIO UART status flags.
  */
  
  uint32_t FLEXIO_UART_GetStatusFlags(FLEXIO_UART_Type *base);
  
  /*!
   * @brief Gets the FlexIO UART status flags.
   *
   * @param base Pointer to the FLEXIO_UART_Type structure.
   * @param mask Status flag.
   *      The parameter can be any combination of the following values:
   *          @arg kFLEXIO_UART_TxDataRegEmptyFlag
   *          @arg kFLEXIO_UART_RxEmptyFlag
   *          @arg kFLEXIO_UART_RxOverRunFlag
  */
  
  void FLEXIO_UART_ClearStatusFlags(FLEXIO_UART_Type *base, uint32_t mask);
  
  /* @} */
  
  /*!
   * @name Interrupts
   * @{
   */
  
  /*!
   * @brief Enables the FlexIO UART interrupt.
   *
   * This function enables the FlexIO UART interrupt.
   *
   * @param base Pointer to the FLEXIO_UART_Type structure.
   * @param mask Interrupt source.
   */
  void FLEXIO_UART_EnableInterrupts(FLEXIO_UART_Type *base, uint32_t mask);
  
  /*!
   * @brief Disables the FlexIO UART interrupt.
   *
   * This function disables the FlexIO UART interrupt.
   *
   * @param base Pointer to the FLEXIO_UART_Type structure.
   * @param mask Interrupt source.
   */
  void FLEXIO_UART_DisableInterrupts(FLEXIO_UART_Type *base, uint32_t mask);
  
  /* @} */
  
  /*!
   * @name DMA Control
   * @{
   */
  
  /*!
   * @brief Gets the FlexIO UARt transmit data register address.
   *
   * This function returns the UART data register address, which is mainly used by DMA/eDMA.
   *
   * @param base Pointer to the FLEXIO_UART_Type structure.
   * @return FlexIO UART transmit data register address.
   */
  static inline uint32_t FLEXIO_UART_GetTxDataRegisterAddress(FLEXIO_UART_Type *base)
  {
      return FLEXIO_GetShifterBufferAddress(base->flexioBase, kFLEXIO_ShifterBuffer, base->shifterIndex[0]);
  }
  
  /*!
   * @brief Gets the FlexIO UART receive data register address.
   *
   * This function returns the UART data register address, which is mainly used by DMA/eDMA.
   *
   * @param base Pointer to the FLEXIO_UART_Type structure.
   * @return FlexIO UART receive data register address.
   */
  static inline uint32_t FLEXIO_UART_GetRxDataRegisterAddress(FLEXIO_UART_Type *base)
  {
      return FLEXIO_GetShifterBufferAddress(base->flexioBase, kFLEXIO_ShifterBufferByteSwapped, base->shifterIndex[1]);
  }
  
  /*!
   * @brief Enables/disables the FlexIO UART transmit DMA.
   * This function enables/disables the FlexIO UART Tx DMA,
   * which means asserting the kFLEXIO_UART_TxDataRegEmptyFlag does/doesn't trigger the DMA request.
   *
   * @param base Pointer to the FLEXIO_UART_Type structure.
   * @param enable True to enable, false to disable.
   */
  static inline void FLEXIO_UART_EnableTxDMA(FLEXIO_UART_Type *base, bool enable)
  {
      FLEXIO_EnableShifterStatusDMA(base->flexioBase, 1 << base->shifterIndex[0], enable);
  }
  
  /*!
   * @brief Enables/disables the FlexIO UART receive DMA.
   * This function enables/disables the FlexIO UART Rx DMA,
   * which means asserting kFLEXIO_UART_RxDataRegFullFlag does/doesn't trigger the DMA request.
   *
   * @param base Pointer to the FLEXIO_UART_Type structure.
   * @param enable True to enable, false to disable.
   */
  static inline void FLEXIO_UART_EnableRxDMA(FLEXIO_UART_Type *base, bool enable)
  {
      FLEXIO_EnableShifterStatusDMA(base->flexioBase, 1 << base->shifterIndex[1], enable);
  }
  
  /* @} */
  
  /*!
   * @name Bus Operations
   * @{
   */
  
  /*!
   * @brief Enables/disables the FlexIO UART module operation.
   *
   * @param base Pointer to the FLEXIO_UART_Type.
   * @param enable True to enable, false does not have any effect.
  */
  static inline void FLEXIO_UART_Enable(FLEXIO_UART_Type *base, bool enable)
  {
      if (enable)
      {
          base->flexioBase->CTRL |= FLEXIO_CTRL_FLEXEN_MASK;
      }
  }
  
  /*!
   * @brief Writes one byte of data.
   *
   * @note This is a non-blocking API, which returns directly after the data is put into the
   * data register. Ensure that the TxEmptyFlag is asserted before calling
   * this API.
   *
   * @param base Pointer to the FLEXIO_UART_Type structure.
   * @param buffer The data bytes to send.
   */
  static inline void FLEXIO_UART_WriteByte(FLEXIO_UART_Type *base, const uint8_t *buffer)
  {
      base->flexioBase->SHIFTBUF[base->shifterIndex[0]] = *buffer;
  }
  
  /*!
   * @brief Reads one byte of data.
   *
   * @note This is a non-blocking API, which returns directly after the data is read from the
   * data register. Ensure that the RxFullFlag is asserted before calling this API.
   *
   * @param base Pointer to the FLEXIO_UART_Type structure.
   * @param buffer The buffer to store the received bytes.
   */
  static inline void FLEXIO_UART_ReadByte(FLEXIO_UART_Type *base, uint8_t *buffer)
  {
      *buffer = base->flexioBase->SHIFTBUFBYS[base->shifterIndex[1]];
  }
  
  /*!
   * @brief Sends a buffer of data bytes.
   *
   * @note This function blocks using the polling method until all bytes have been sent.
   *
   * @param base Pointer to the FLEXIO_UART_Type structure.
   * @param txData The data bytes to send.
   * @param txSize The number of data bytes to send.
   */
  void FLEXIO_UART_WriteBlocking(FLEXIO_UART_Type *base, const uint8_t *txData, size_t txSize);
  
  /*!
   * @brief Receives a buffer of bytes.
   *
   * @note This function blocks using the polling method until all bytes have been received.
   *
   * @param base Pointer to the FLEXIO_UART_Type structure.
   * @param rxData The buffer to store the received bytes.
   * @param rxSize The number of data bytes to be received.
   */
  void FLEXIO_UART_ReadBlocking(FLEXIO_UART_Type *base, uint8_t *rxData, size_t rxSize);
  
  /* @} */
  
  /*!
   * @name Transactional
   * @{
   */
  
  /*!
   * @brief Initializes the UART handle.
   *
   * This function initializes the FlexIO UART handle, which can be used for other FlexIO
   * UART transactional APIs. Call this API once to get the
   * initialized handle.
   *
   * The UART driver supports the "background" receiving, which means that users can set up
   * a RX ring buffer optionally. Data received is stored into the ring buffer even when
   * the user doesn't call the FLEXIO_UART_TransferReceiveNonBlocking() API. If there is already data
   * received in the ring buffer, users can get the received data from the ring buffer
   * directly. The ring buffer is disabled if passing NULL as @p ringBuffer.
   *
   * @param base to FLEXIO_UART_Type structure.
   * @param handle Pointer to the flexio_uart_handle_t structure to store the transfer state.
   * @param callback The callback function.
   * @param userData The parameter of the callback function.
   * @retval kStatus_Success Successfully create the handle.
   * @retval kStatus_OutOfRange The FlexIO type/handle/ISR table out of range.
   */
  status_t FLEXIO_UART_TransferCreateHandle(FLEXIO_UART_Type *base,
                                            flexio_uart_handle_t *handle,
                                            flexio_uart_transfer_callback_t callback,
                                            void *userData);
  
  /*!
   * @brief Sets up the RX ring buffer.
   *
   * This function sets up the RX ring buffer to a specific UART handle.
   *
   * When the RX ring buffer is used, data received is stored into the ring buffer even when
   * the user doesn't call the UART_ReceiveNonBlocking() API. If there is already data received
   * in the ring buffer, users can get the received data from the ring buffer directly.
   *
   * @note When using the RX ring buffer, one byte is reserved for internal use. In other
   * words, if @p ringBufferSize is 32, only 31 bytes are used for saving data.
   *
   * @param base Pointer to the FLEXIO_UART_Type structure.
   * @param handle Pointer to the flexio_uart_handle_t structure to store the transfer state.
   * @param ringBuffer Start address of ring buffer for background receiving. Pass NULL to disable the ring buffer.
   * @param ringBufferSize Size of the ring buffer.
   */
  void FLEXIO_UART_TransferStartRingBuffer(FLEXIO_UART_Type *base,
                                           flexio_uart_handle_t *handle,
                                           uint8_t *ringBuffer,
                                           size_t ringBufferSize);
  
  /*!
   * @brief Aborts the background transfer and uninstalls the ring buffer.
   *
   * This function aborts the background transfer and uninstalls the ring buffer.
   *
   * @param base Pointer to the FLEXIO_UART_Type structure.
   * @param handle Pointer to the flexio_uart_handle_t structure to store the transfer state.
   */
  void FLEXIO_UART_TransferStopRingBuffer(FLEXIO_UART_Type *base, flexio_uart_handle_t *handle);
  
  /*!
   * @brief Transmits a buffer of data using the interrupt method.
   *
   * This function sends data using an interrupt method. This is a non-blocking function,
   * which returns directly without waiting for all data to be written to the TX register. When
   * all data is written to the TX register in ISR, the FlexIO UART driver calls the callback
   * function and passes the @ref kStatus_FLEXIO_UART_TxIdle as status parameter.
   *
   * @note The kStatus_FLEXIO_UART_TxIdle is passed to the upper layer when all data is written
   * to the TX register. However, it does not ensure that all data is sent out.
   *
   * @param base Pointer to the FLEXIO_UART_Type structure.
   * @param handle Pointer to the flexio_uart_handle_t structure to store the transfer state.
   * @param xfer FlexIO UART transfer structure. See #flexio_uart_transfer_t.
   * @retval kStatus_Success Successfully starts the data transmission.
   * @retval kStatus_UART_TxBusy Previous transmission still not finished, data not written to the TX register.
   */
  status_t FLEXIO_UART_TransferSendNonBlocking(FLEXIO_UART_Type *base,
                                               flexio_uart_handle_t *handle,
                                               flexio_uart_transfer_t *xfer);
  
  /*!
   * @brief Aborts the interrupt-driven data transmit.
   *
   * This function aborts the interrupt-driven data sending. Get the remainBytes to find out
   * how many bytes are still not sent out.
   *
   * @param base Pointer to the FLEXIO_UART_Type structure.
   * @param handle Pointer to the flexio_uart_handle_t structure to store the transfer state.
   */
  void FLEXIO_UART_TransferAbortSend(FLEXIO_UART_Type *base, flexio_uart_handle_t *handle);
  
  /*!
   * @brief Gets the number of bytes sent.
   *
   * This function gets the number of bytes sent driven by interrupt.
   *
   * @param base Pointer to the FLEXIO_UART_Type structure.
   * @param handle Pointer to the flexio_uart_handle_t structure to store the transfer state.
   * @param count Number of bytes sent so far by the non-blocking transaction.
   * @retval kStatus_NoTransferInProgress transfer has finished or no transfer in progress.
   * @retval kStatus_Success Successfully return the count.
   */
  status_t FLEXIO_UART_TransferGetSendCount(FLEXIO_UART_Type *base, flexio_uart_handle_t *handle, size_t *count);
  
  /*!
   * @brief Receives a buffer of data using the interrupt method.
   *
   * This function receives data using the interrupt method. This is a non-blocking function,
   * which returns without waiting for all data to be received.
   * If the RX ring buffer is used and not empty, the data in ring buffer is copied and
   * the parameter @p receivedBytes shows how many bytes are copied from the ring buffer.
   * After copying, if the data in ring buffer is not enough to read, the receive
   * request is saved by the UART driver. When new data arrives, the receive request
   * is serviced first. When all data is received, the UART driver notifies the upper layer
   * through a callback function and passes the status parameter @ref kStatus_UART_RxIdle.
   * For example, if the upper layer needs 10 bytes but there are only 5 bytes in the ring buffer,
   * the 5 bytes are copied to xfer->data. This function returns with the
   * parameter @p receivedBytes set to 5. For the last 5 bytes, newly arrived data is
   * saved from the xfer->data[5]. When 5 bytes are received, the UART driver notifies upper layer.
   * If the RX ring buffer is not enabled, this function enables the RX and RX interrupt
   * to receive data to xfer->data. When all data is received, the upper layer is notified.
   *
   * @param base Pointer to the FLEXIO_UART_Type structure.
   * @param handle Pointer to the flexio_uart_handle_t structure to store the transfer state.
   * @param xfer UART transfer structure. See #flexio_uart_transfer_t.
   * @param receivedBytes Bytes received from the ring buffer directly.
   * @retval kStatus_Success Successfully queue the transfer into the transmit queue.
   * @retval kStatus_FLEXIO_UART_RxBusy Previous receive request is not finished.
   */
  status_t FLEXIO_UART_TransferReceiveNonBlocking(FLEXIO_UART_Type *base,
                                                  flexio_uart_handle_t *handle,
                                                  flexio_uart_transfer_t *xfer,
                                                  size_t *receivedBytes);
  
  /*!
   * @brief Aborts the receive data which was using IRQ.
   *
   * This function aborts the receive data which was using IRQ.
   *
   * @param base Pointer to the FLEXIO_UART_Type structure.
   * @param handle Pointer to the flexio_uart_handle_t structure to store the transfer state.
   */
  void FLEXIO_UART_TransferAbortReceive(FLEXIO_UART_Type *base, flexio_uart_handle_t *handle);
  
  /*!
   * @brief Gets the number of bytes received.
   *
   * This function gets the number of bytes received driven by interrupt.
   *
   * @param base Pointer to the FLEXIO_UART_Type structure.
   * @param handle Pointer to the flexio_uart_handle_t structure to store the transfer state.
   * @param count Number of bytes received so far by the non-blocking transaction.
   * @retval kStatus_NoTransferInProgress transfer has finished or no transfer in progress.
   * @retval kStatus_Success Successfully return the count.
   */
  status_t FLEXIO_UART_TransferGetReceiveCount(FLEXIO_UART_Type *base, flexio_uart_handle_t *handle, size_t *count);
  
  /*!
   * @brief FlexIO UART IRQ handler function.
   *
   * This function processes the FlexIO UART transmit and receives the IRQ request.
   *
   * @param uartType Pointer to the FLEXIO_UART_Type structure.
   * @param uartHandle Pointer to the flexio_uart_handle_t structure to store the transfer state.
   */
  void FLEXIO_UART_TransferHandleIRQ(void *uartType, void *uartHandle);
  
  /*@}*/
  
  #if defined(__cplusplus)
  }
  #endif /*_cplusplus*/
  /*@}*/
  
  #endif /*_FSL_FLEXIO_UART_H_*/
  