Diff: TARGET_K66F/TOOLCHAIN_IAR/fsl_lpuart.h

Revision:

171:3a7713b1edbc

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/TARGET_K66F/TOOLCHAIN_IAR/fsl_lpuart.h	Thu Nov 08 11:45:42 2018 +0000
@@ -0,0 +1,814 @@
+/*
+ * Copyright (c) 2015-2016, Freescale Semiconductor, Inc.
+ * Copyright 2016-2017 NXP
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted 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.
+ *
+ * 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;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * 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_LPUART_H_
+#define _FSL_LPUART_H_
+
+#include "fsl_common.h"
+
+/*!
+ * @addtogroup lpuart_driver
+ * @{
+ */
+
+/*******************************************************************************
+ * Definitions
+ ******************************************************************************/
+
+/*! @name Driver version */
+/*@{*/
+/*! @brief LPUART driver version 2.2.3. */
+#define FSL_LPUART_DRIVER_VERSION (MAKE_VERSION(2, 2, 3))
+/*@}*/
+
+/*! @brief Error codes for the LPUART driver. */
+enum _lpuart_status
+{
+    kStatus_LPUART_TxBusy = MAKE_STATUS(kStatusGroup_LPUART, 0),                  /*!< TX busy */
+    kStatus_LPUART_RxBusy = MAKE_STATUS(kStatusGroup_LPUART, 1),                  /*!< RX busy */
+    kStatus_LPUART_TxIdle = MAKE_STATUS(kStatusGroup_LPUART, 2),                  /*!< LPUART transmitter is idle. */
+    kStatus_LPUART_RxIdle = MAKE_STATUS(kStatusGroup_LPUART, 3),                  /*!< LPUART receiver is idle. */
+    kStatus_LPUART_TxWatermarkTooLarge = MAKE_STATUS(kStatusGroup_LPUART, 4),     /*!< TX FIFO watermark too large  */
+    kStatus_LPUART_RxWatermarkTooLarge = MAKE_STATUS(kStatusGroup_LPUART, 5),     /*!< RX FIFO watermark too large  */
+    kStatus_LPUART_FlagCannotClearManually = MAKE_STATUS(kStatusGroup_LPUART, 6), /*!< Some flag can't manually clear */
+    kStatus_LPUART_Error = MAKE_STATUS(kStatusGroup_LPUART, 7),                   /*!< Error happens on LPUART. */
+    kStatus_LPUART_RxRingBufferOverrun =
+        MAKE_STATUS(kStatusGroup_LPUART, 8), /*!< LPUART RX software ring buffer overrun. */
+    kStatus_LPUART_RxHardwareOverrun = MAKE_STATUS(kStatusGroup_LPUART, 9), /*!< LPUART RX receiver overrun. */
+    kStatus_LPUART_NoiseError = MAKE_STATUS(kStatusGroup_LPUART, 10),       /*!< LPUART noise error. */
+    kStatus_LPUART_FramingError = MAKE_STATUS(kStatusGroup_LPUART, 11),     /*!< LPUART framing error. */
+    kStatus_LPUART_ParityError = MAKE_STATUS(kStatusGroup_LPUART, 12),      /*!< LPUART parity error. */
+    kStatus_LPUART_BaudrateNotSupport =
+        MAKE_STATUS(kStatusGroup_LPUART, 13), /*!< Baudrate is not support in current clock source */
+};
+
+/*! @brief LPUART parity mode. */
+typedef enum _lpuart_parity_mode
+{
+    kLPUART_ParityDisabled = 0x0U, /*!< Parity disabled */
+    kLPUART_ParityEven = 0x2U,     /*!< Parity enabled, type even, bit setting: PE|PT = 10 */
+    kLPUART_ParityOdd = 0x3U,      /*!< Parity enabled, type odd,  bit setting: PE|PT = 11 */
+} lpuart_parity_mode_t;
+
+/*! @brief LPUART data bits count. */
+typedef enum _lpuart_data_bits
+{
+    kLPUART_EightDataBits = 0x0U, /*!< Eight data bit */
+#if defined(FSL_FEATURE_LPUART_HAS_7BIT_DATA_SUPPORT) && FSL_FEATURE_LPUART_HAS_7BIT_DATA_SUPPORT
+    kLPUART_SevenDataBits = 0x1U, /*!< Seven data bit */
+#endif
+} lpuart_data_bits_t;
+
+/*! @brief LPUART stop bit count. */
+typedef enum _lpuart_stop_bit_count
+{
+    kLPUART_OneStopBit = 0U, /*!< One stop bit */
+    kLPUART_TwoStopBit = 1U, /*!< Two stop bits */
+} lpuart_stop_bit_count_t;
+
+/*!
+ * @brief LPUART interrupt configuration structure, default settings all disabled.
+ *
+ * This structure contains the settings for all LPUART interrupt configurations.
+ */
+enum _lpuart_interrupt_enable
+{
+#if defined(FSL_FEATURE_LPUART_HAS_LIN_BREAK_DETECT) && FSL_FEATURE_LPUART_HAS_LIN_BREAK_DETECT
+    kLPUART_LinBreakInterruptEnable = (LPUART_BAUD_LBKDIE_MASK >> 8), /*!< LIN break detect. */
+#endif
+    kLPUART_RxActiveEdgeInterruptEnable = (LPUART_BAUD_RXEDGIE_MASK >> 8), /*!< Receive Active Edge. */
+    kLPUART_TxDataRegEmptyInterruptEnable = (LPUART_CTRL_TIE_MASK),        /*!< Transmit data register empty. */
+    kLPUART_TransmissionCompleteInterruptEnable = (LPUART_CTRL_TCIE_MASK), /*!< Transmission complete. */
+    kLPUART_RxDataRegFullInterruptEnable = (LPUART_CTRL_RIE_MASK),         /*!< Receiver data register full. */
+    kLPUART_IdleLineInterruptEnable = (LPUART_CTRL_ILIE_MASK),             /*!< Idle line. */
+    kLPUART_RxOverrunInterruptEnable = (LPUART_CTRL_ORIE_MASK),            /*!< Receiver Overrun. */
+    kLPUART_NoiseErrorInterruptEnable = (LPUART_CTRL_NEIE_MASK),           /*!< Noise error flag. */
+    kLPUART_FramingErrorInterruptEnable = (LPUART_CTRL_FEIE_MASK),         /*!< Framing error flag. */
+    kLPUART_ParityErrorInterruptEnable = (LPUART_CTRL_PEIE_MASK),          /*!< Parity error flag. */
+#if defined(FSL_FEATURE_LPUART_HAS_FIFO) && FSL_FEATURE_LPUART_HAS_FIFO
+    kLPUART_TxFifoOverflowInterruptEnable = (LPUART_FIFO_TXOFE_MASK >> 8),  /*!< Transmit FIFO Overflow. */
+    kLPUART_RxFifoUnderflowInterruptEnable = (LPUART_FIFO_RXUFE_MASK >> 8), /*!< Receive FIFO Underflow. */
+#endif
+};
+
+/*!
+ * @brief LPUART status flags.
+ *
+ * This provides constants for the LPUART status flags for use in the LPUART functions.
+ */
+enum _lpuart_flags
+{
+    kLPUART_TxDataRegEmptyFlag =
+        (LPUART_STAT_TDRE_MASK), /*!< Transmit data register empty flag, sets when transmit buffer is empty */
+    kLPUART_TransmissionCompleteFlag =
+        (LPUART_STAT_TC_MASK), /*!< Transmission complete flag, sets when transmission activity complete */
+    kLPUART_RxDataRegFullFlag =
+        (LPUART_STAT_RDRF_MASK), /*!< Receive data register full flag, sets when the receive data buffer is full */
+    kLPUART_IdleLineFlag = (LPUART_STAT_IDLE_MASK), /*!< Idle line detect flag, sets when idle line detected */
+    kLPUART_RxOverrunFlag = (LPUART_STAT_OR_MASK),  /*!< Receive Overrun, sets when new data is received before data is
+                                                       read from receive register */
+    kLPUART_NoiseErrorFlag = (LPUART_STAT_NF_MASK), /*!< Receive takes 3 samples of each received bit.  If any of these
+                                                       samples differ, noise flag sets */
+    kLPUART_FramingErrorFlag =
+        (LPUART_STAT_FE_MASK), /*!< Frame error flag, sets if logic 0 was detected where stop bit expected */
+    kLPUART_ParityErrorFlag = (LPUART_STAT_PF_MASK), /*!< If parity enabled, sets upon parity error detection */
+#if defined(FSL_FEATURE_LPUART_HAS_LIN_BREAK_DETECT) && FSL_FEATURE_LPUART_HAS_LIN_BREAK_DETECT
+    kLPUART_LinBreakFlag = (LPUART_STAT_LBKDIF_MASK), /*!< LIN break detect interrupt flag, sets when LIN break char
+                                                         detected and LIN circuit enabled */
+#endif
+    kLPUART_RxActiveEdgeFlag =
+        (LPUART_STAT_RXEDGIF_MASK), /*!< Receive pin active edge interrupt flag, sets when active edge detected */
+    kLPUART_RxActiveFlag =
+        (LPUART_STAT_RAF_MASK), /*!< Receiver Active Flag (RAF), sets at beginning of valid start bit */
+#if defined(FSL_FEATURE_LPUART_HAS_ADDRESS_MATCHING) && FSL_FEATURE_LPUART_HAS_ADDRESS_MATCHING
+    kLPUART_DataMatch1Flag = LPUART_STAT_MA1F_MASK, /*!< The next character to be read from LPUART_DATA matches MA1*/
+    kLPUART_DataMatch2Flag = LPUART_STAT_MA2F_MASK, /*!< The next character to be read from LPUART_DATA matches MA2*/
+#endif
+#if defined(FSL_FEATURE_LPUART_HAS_EXTENDED_DATA_REGISTER_FLAGS) && FSL_FEATURE_LPUART_HAS_EXTENDED_DATA_REGISTER_FLAGS
+    kLPUART_NoiseErrorInRxDataRegFlag =
+        (LPUART_DATA_NOISY_MASK >> 10), /*!< NOISY bit, sets if noise detected in current data word */
+    kLPUART_ParityErrorInRxDataRegFlag =
+        (LPUART_DATA_PARITYE_MASK >> 10), /*!< PARITYE bit, sets if noise detected in current data word */
+#endif
+#if defined(FSL_FEATURE_LPUART_HAS_FIFO) && FSL_FEATURE_LPUART_HAS_FIFO
+    kLPUART_TxFifoEmptyFlag = (LPUART_FIFO_TXEMPT_MASK >> 16), /*!< TXEMPT bit, sets if transmit buffer is empty */
+    kLPUART_RxFifoEmptyFlag = (LPUART_FIFO_RXEMPT_MASK >> 16), /*!< RXEMPT bit, sets if receive buffer is empty */
+    kLPUART_TxFifoOverflowFlag =
+        (LPUART_FIFO_TXOF_MASK >> 16), /*!< TXOF bit, sets if transmit buffer overflow occurred */
+    kLPUART_RxFifoUnderflowFlag =
+        (LPUART_FIFO_RXUF_MASK >> 16), /*!< RXUF bit, sets if receive buffer underflow occurred */
+#endif
+};
+
+/*! @brief LPUART configuration structure. */
+typedef struct _lpuart_config
+{
+    uint32_t baudRate_Bps;            /*!< LPUART baud rate  */
+    lpuart_parity_mode_t parityMode;  /*!< Parity mode, disabled (default), even, odd */
+    lpuart_data_bits_t dataBitsCount; /*!< Data bits count, eight (default), seven */
+    bool isMsb;                       /*!< Data bits order, LSB (default), MSB */
+#if defined(FSL_FEATURE_LPUART_HAS_STOP_BIT_CONFIG_SUPPORT) && FSL_FEATURE_LPUART_HAS_STOP_BIT_CONFIG_SUPPORT
+    lpuart_stop_bit_count_t stopBitCount; /*!< Number of stop bits, 1 stop bit (default) or 2 stop bits  */
+#endif
+#if defined(FSL_FEATURE_LPUART_HAS_FIFO) && FSL_FEATURE_LPUART_HAS_FIFO
+    uint8_t txFifoWatermark; /*!< TX FIFO watermark */
+    uint8_t rxFifoWatermark; /*!< RX FIFO watermark */
+#endif
+    bool enableTx; /*!< Enable TX */
+    bool enableRx; /*!< Enable RX */
+} lpuart_config_t;
+
+/*! @brief LPUART transfer structure. */
+typedef struct _lpuart_transfer
+{
+    uint8_t *data;   /*!< The buffer of data to be transfer.*/
+    size_t dataSize; /*!< The byte count to be transfer. */
+} lpuart_transfer_t;
+
+/* Forward declaration of the handle typedef. */
+typedef struct _lpuart_handle lpuart_handle_t;
+
+/*! @brief LPUART transfer callback function. */
+typedef void (*lpuart_transfer_callback_t)(LPUART_Type *base, lpuart_handle_t *handle, status_t status, void *userData);
+
+/*! @brief LPUART handle structure. */
+struct _lpuart_handle
+{
+    uint8_t *volatile txData;   /*!< Address of remaining data to send. */
+    volatile size_t txDataSize; /*!< Size of the remaining data to send. */
+    size_t txDataSizeAll;       /*!< Size of the data to send out. */
+    uint8_t *volatile rxData;   /*!< Address of remaining data to receive. */
+    volatile size_t rxDataSize; /*!< Size of the remaining data to receive. */
+    size_t rxDataSizeAll;       /*!< Size of the data to receive. */
+
+    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. */
+
+    lpuart_transfer_callback_t callback; /*!< Callback function. */
+    void *userData;                      /*!< LPUART callback function parameter.*/
+
+    volatile uint8_t txState; /*!< TX transfer state. */
+    volatile uint8_t rxState; /*!< RX transfer state. */
+
+#if defined(FSL_FEATURE_LPUART_HAS_7BIT_DATA_SUPPORT) && FSL_FEATURE_LPUART_HAS_7BIT_DATA_SUPPORT
+    bool isSevenDataBits; /*!< Seven data bits flag. */
+#endif
+};
+
+/*******************************************************************************
+ * API
+ ******************************************************************************/
+
+#if defined(__cplusplus)
+extern "C" {
+#endif /* _cplusplus */
+
+#if defined(FSL_FEATURE_LPUART_HAS_GLOBAL) && FSL_FEATURE_LPUART_HAS_GLOBAL
+
+/*!
+ * @name Software Reset
+ * @{
+ */
+
+/*!
+ * @brief Resets the LPUART using software.
+ *
+ * This function resets all internal logic and registers except the Global Register.
+ * Remains set until cleared by software.
+ *
+ * @param base LPUART peripheral base address.
+ */
+static inline void LPUART_SoftwareReset(LPUART_Type *base)
+{
+    base->GLOBAL |= LPUART_GLOBAL_RST_MASK;
+    base->GLOBAL &= ~LPUART_GLOBAL_RST_MASK;
+}
+/* @} */
+#endif /*FSL_FEATURE_LPUART_HAS_GLOBAL*/
+
+/*!
+ * @name Initialization and deinitialization
+ * @{
+ */
+
+/*!
+ * @brief Initializes an LPUART instance with the user configuration structure and the peripheral clock.
+ *
+ * This function configures the LPUART module with user-defined settings. Call the LPUART_GetDefaultConfig() function
+ * to configure the configuration structure and get the default configuration.
+ * The example below shows how to use this API to configure the LPUART.
+ * @code
+ *  lpuart_config_t lpuartConfig;
+ *  lpuartConfig.baudRate_Bps = 115200U;
+ *  lpuartConfig.parityMode = kLPUART_ParityDisabled;
+ *  lpuartConfig.dataBitsCount = kLPUART_EightDataBits;
+ *  lpuartConfig.isMsb = false;
+ *  lpuartConfig.stopBitCount = kLPUART_OneStopBit;
+ *  lpuartConfig.txFifoWatermark = 0;
+ *  lpuartConfig.rxFifoWatermark = 1;
+ *  LPUART_Init(LPUART1, &lpuartConfig, 20000000U);
+ * @endcode
+ *
+ * @param base LPUART peripheral base address.
+ * @param config Pointer to a user-defined configuration structure.
+ * @param srcClock_Hz LPUART clock source frequency in HZ.
+ * @retval kStatus_LPUART_BaudrateNotSupport Baudrate is not support in current clock source.
+ * @retval kStatus_Success LPUART initialize succeed
+ */
+status_t LPUART_Init(LPUART_Type *base, const lpuart_config_t *config, uint32_t srcClock_Hz);
+
+/*!
+ * @brief Deinitializes a LPUART instance.
+ *
+ * This function waits for transmit to complete, disables TX and RX, and disables the LPUART clock.
+ *
+ * @param base LPUART peripheral base address.
+ */
+void LPUART_Deinit(LPUART_Type *base);
+
+/*!
+ * @brief Gets the default configuration structure.
+ *
+ * This function initializes the LPUART configuration structure to a default value. The default
+ * values are:
+ *   lpuartConfig->baudRate_Bps = 115200U;
+ *   lpuartConfig->parityMode = kLPUART_ParityDisabled;
+ *   lpuartConfig->dataBitsCount = kLPUART_EightDataBits;
+ *   lpuartConfig->isMsb = false;
+ *   lpuartConfig->stopBitCount = kLPUART_OneStopBit;
+ *   lpuartConfig->txFifoWatermark = 0;
+ *   lpuartConfig->rxFifoWatermark = 1;
+ *   lpuartConfig->enableTx = false;
+ *   lpuartConfig->enableRx = false;
+ *
+ * @param config Pointer to a configuration structure.
+ */
+void LPUART_GetDefaultConfig(lpuart_config_t *config);
+
+/*!
+ * @brief Sets the LPUART instance baudrate.
+ *
+ * This function configures the LPUART module baudrate. This function is used to update
+ * the LPUART module baudrate after the LPUART module is initialized by the LPUART_Init.
+ * @code
+ *  LPUART_SetBaudRate(LPUART1, 115200U, 20000000U);
+ * @endcode
+ *
+ * @param base LPUART peripheral base address.
+ * @param baudRate_Bps LPUART baudrate to be set.
+ * @param srcClock_Hz LPUART clock source frequency in HZ.
+ * @retval kStatus_LPUART_BaudrateNotSupport Baudrate is not supported in the current clock source.
+ * @retval kStatus_Success Set baudrate succeeded.
+ */
+status_t LPUART_SetBaudRate(LPUART_Type *base, uint32_t baudRate_Bps, uint32_t srcClock_Hz);
+
+/* @} */
+
+/*!
+ * @name Status
+ * @{
+ */
+
+/*!
+ * @brief Gets LPUART status flags.
+ *
+ * This function gets all LPUART status flags. The flags are returned as the logical
+ * OR value of the enumerators @ref _lpuart_flags. To check for a specific status,
+ * compare the return value with enumerators in the @ref _lpuart_flags.
+ * For example, to check whether the TX is empty:
+ * @code
+ *     if (kLPUART_TxDataRegEmptyFlag & LPUART_GetStatusFlags(LPUART1))
+ *     {
+ *         ...
+ *     }
+ * @endcode
+ *
+ * @param base LPUART peripheral base address.
+ * @return LPUART status flags which are ORed by the enumerators in the _lpuart_flags.
+ */
+uint32_t LPUART_GetStatusFlags(LPUART_Type *base);
+
+/*!
+ * @brief Clears status flags with a provided mask.
+ *
+ * This function clears LPUART status flags with a provided mask. Automatically cleared flags
+ * can't be cleared by this function.
+ * Flags that can only cleared or set by hardware are:
+ *    kLPUART_TxDataRegEmptyFlag, kLPUART_TransmissionCompleteFlag, kLPUART_RxDataRegFullFlag,
+ *    kLPUART_RxActiveFlag, kLPUART_NoiseErrorInRxDataRegFlag, kLPUART_ParityErrorInRxDataRegFlag,
+ *    kLPUART_TxFifoEmptyFlag,kLPUART_RxFifoEmptyFlag
+ * Note: This API should be called when the Tx/Rx is idle, otherwise it takes no effects.
+ *
+ * @param base LPUART peripheral base address.
+ * @param mask the status flags to be cleared. The user can use the enumerators in the
+ *  _lpuart_status_flag_t to do the OR operation and get the mask.
+ * @return 0 succeed, others failed.
+ * @retval kStatus_LPUART_FlagCannotClearManually The flag can't be cleared by this function but
+ *         it is cleared automatically by hardware.
+ * @retval kStatus_Success Status in the mask are cleared.
+ */
+status_t LPUART_ClearStatusFlags(LPUART_Type *base, uint32_t mask);
+
+/* @} */
+
+/*!
+ * @name Interrupts
+ * @{
+ */
+
+/*!
+ * @brief Enables LPUART interrupts according to a provided mask.
+ *
+ * This function enables the LPUART interrupts according to a provided mask. The mask
+ * is a logical OR of enumeration members. See the @ref _lpuart_interrupt_enable.
+ * This examples shows how to enable TX empty interrupt and RX full interrupt:
+ * @code
+ *     LPUART_EnableInterrupts(LPUART1,kLPUART_TxDataRegEmptyInterruptEnable | kLPUART_RxDataRegFullInterruptEnable);
+ * @endcode
+ *
+ * @param base LPUART peripheral base address.
+ * @param mask The interrupts to enable. Logical OR of @ref _uart_interrupt_enable.
+ */
+void LPUART_EnableInterrupts(LPUART_Type *base, uint32_t mask);
+
+/*!
+ * @brief Disables  LPUART interrupts according to a provided mask.
+ *
+ * This function disables the LPUART interrupts according to a provided mask. The mask
+ * is a logical OR of enumeration members. See @ref _lpuart_interrupt_enable.
+ * This example shows how to disable the TX empty interrupt and RX full interrupt:
+ * @code
+ *     LPUART_DisableInterrupts(LPUART1,kLPUART_TxDataRegEmptyInterruptEnable | kLPUART_RxDataRegFullInterruptEnable);
+ * @endcode
+ *
+ * @param base LPUART peripheral base address.
+ * @param mask The interrupts to disable. Logical OR of @ref _lpuart_interrupt_enable.
+ */
+void LPUART_DisableInterrupts(LPUART_Type *base, uint32_t mask);
+
+/*!
+ * @brief Gets enabled LPUART interrupts.
+ *
+ * This function gets the enabled LPUART interrupts. The enabled interrupts are returned
+ * as the logical OR value of the enumerators @ref _lpuart_interrupt_enable. To check
+ * a specific interrupt enable status, compare the return value with enumerators
+ * in @ref _lpuart_interrupt_enable.
+ * For example, to check whether the TX empty interrupt is enabled:
+ * @code
+ *     uint32_t enabledInterrupts = LPUART_GetEnabledInterrupts(LPUART1);
+ *
+ *     if (kLPUART_TxDataRegEmptyInterruptEnable & enabledInterrupts)
+ *     {
+ *         ...
+ *     }
+ * @endcode
+ *
+ * @param base LPUART peripheral base address.
+ * @return LPUART interrupt flags which are logical OR of the enumerators in @ref _lpuart_interrupt_enable.
+ */
+uint32_t LPUART_GetEnabledInterrupts(LPUART_Type *base);
+
+#if defined(FSL_FEATURE_LPUART_HAS_DMA_ENABLE) && FSL_FEATURE_LPUART_HAS_DMA_ENABLE
+/*!
+ * @brief Gets the LPUART data register address.
+ *
+ * This function returns the LPUART data register address, which is mainly used by the DMA/eDMA.
+ *
+ * @param base LPUART peripheral base address.
+ * @return LPUART data register addresses which are used both by the transmitter and receiver.
+ */
+static inline uint32_t LPUART_GetDataRegisterAddress(LPUART_Type *base)
+{
+    return (uint32_t) & (base->DATA);
+}
+
+/*!
+ * @brief Enables or disables the LPUART transmitter DMA request.
+ *
+ * This function enables or disables the transmit data register empty flag, STAT[TDRE], to generate DMA requests.
+ *
+ * @param base LPUART peripheral base address.
+ * @param enable True to enable, false to disable.
+ */
+static inline void LPUART_EnableTxDMA(LPUART_Type *base, bool enable)
+{
+    if (enable)
+    {
+        base->BAUD |= LPUART_BAUD_TDMAE_MASK;
+        base->CTRL |= LPUART_CTRL_TIE_MASK;
+    }
+    else
+    {
+        base->BAUD &= ~LPUART_BAUD_TDMAE_MASK;
+        base->CTRL &= ~LPUART_CTRL_TIE_MASK;
+    }
+}
+
+/*!
+ * @brief Enables or disables the LPUART receiver DMA.
+ *
+ * This function enables or disables the receiver data register full flag, STAT[RDRF], to generate DMA requests.
+ *
+ * @param base LPUART peripheral base address.
+ * @param enable True to enable, false to disable.
+ */
+static inline void LPUART_EnableRxDMA(LPUART_Type *base, bool enable)
+{
+    if (enable)
+    {
+        base->BAUD |= LPUART_BAUD_RDMAE_MASK;
+        base->CTRL |= LPUART_CTRL_RIE_MASK;
+    }
+    else
+    {
+        base->BAUD &= ~LPUART_BAUD_RDMAE_MASK;
+        base->CTRL &= ~LPUART_CTRL_RIE_MASK;
+    }
+}
+
+/* @} */
+#endif /* FSL_FEATURE_LPUART_HAS_DMA_ENABLE */
+
+/*!
+ * @name Bus Operations
+ * @{
+ */
+
+/*!
+ * @brief Enables or disables the LPUART transmitter.
+ *
+ * This function enables or disables the LPUART transmitter.
+ *
+ * @param base LPUART peripheral base address.
+ * @param enable True to enable, false to disable.
+ */
+static inline void LPUART_EnableTx(LPUART_Type *base, bool enable)
+{
+    if (enable)
+    {
+        base->CTRL |= LPUART_CTRL_TE_MASK;
+    }
+    else
+    {
+        base->CTRL &= ~LPUART_CTRL_TE_MASK;
+    }
+}
+
+/*!
+ * @brief Enables or disables the LPUART receiver.
+ *
+ * This function enables or disables the LPUART receiver.
+ *
+ * @param base LPUART peripheral base address.
+ * @param enable True to enable, false to disable.
+ */
+static inline void LPUART_EnableRx(LPUART_Type *base, bool enable)
+{
+    if (enable)
+    {
+        base->CTRL |= LPUART_CTRL_RE_MASK;
+    }
+    else
+    {
+        base->CTRL &= ~LPUART_CTRL_RE_MASK;
+    }
+}
+
+/*!
+ * @brief Writes to the transmitter register.
+ *
+ * This function writes data to the transmitter register directly. The upper layer must
+ * ensure that the TX register is empty or that the TX FIFO has room before calling this function.
+ *
+ * @param base LPUART peripheral base address.
+ * @param data Data write to the TX register.
+ */
+static inline void LPUART_WriteByte(LPUART_Type *base, uint8_t data)
+{
+    base->DATA = data;
+}
+
+/*!
+ * @brief Reads the receiver register.
+ *
+ * This function reads data from the receiver register directly. The upper layer must
+ * ensure that the receiver register is full or that the RX FIFO has data before calling this function.
+ *
+ * @param base LPUART peripheral base address.
+ * @return Data read from data register.
+ */
+static inline uint8_t LPUART_ReadByte(LPUART_Type *base)
+{
+#if defined(FSL_FEATURE_LPUART_HAS_7BIT_DATA_SUPPORT) && FSL_FEATURE_LPUART_HAS_7BIT_DATA_SUPPORT
+    uint32_t ctrl = base->CTRL;
+    bool isSevenDataBits =
+        ((ctrl & LPUART_CTRL_M7_MASK) ||
+         ((!(ctrl & LPUART_CTRL_M7_MASK)) && (!(ctrl & LPUART_CTRL_M_MASK)) && (ctrl & LPUART_CTRL_PE_MASK)));
+
+    if (isSevenDataBits)
+    {
+        return (base->DATA & 0x7F);
+    }
+    else
+    {
+        return base->DATA;
+    }
+#else
+    return base->DATA;
+#endif
+}
+
+/*!
+ * @brief Writes to the transmitter register using a blocking method.
+ *
+ * This function polls the transmitter register, waits for the register to be empty or  for TX FIFO to have
+ * room, and writes data to the transmitter buffer.
+ *
+ * @note This function does not check whether all data has been sent out to the bus.
+ * Before disabling the transmitter, check the kLPUART_TransmissionCompleteFlag to ensure that the transmit is
+ * finished.
+ *
+ * @param base LPUART peripheral base address.
+ * @param data Start address of the data to write.
+ * @param length Size of the data to write.
+ */
+void LPUART_WriteBlocking(LPUART_Type *base, const uint8_t *data, size_t length);
+
+/*!
+* @brief Reads the receiver data register using a blocking method.
+ *
+ * This function polls the receiver register, waits for the receiver register full or receiver FIFO
+ * has data, and reads data from the TX register.
+ *
+ * @param base LPUART peripheral base address.
+ * @param data Start address of the buffer to store the received data.
+ * @param length Size of the buffer.
+ * @retval kStatus_LPUART_RxHardwareOverrun Receiver overrun happened while receiving data.
+ * @retval kStatus_LPUART_NoiseError Noise error happened while receiving data.
+ * @retval kStatus_LPUART_FramingError Framing error happened while receiving data.
+ * @retval kStatus_LPUART_ParityError Parity error happened while receiving data.
+ * @retval kStatus_Success Successfully received all data.
+ */
+status_t LPUART_ReadBlocking(LPUART_Type *base, uint8_t *data, size_t length);
+
+/* @} */
+
+/*!
+ * @name Transactional
+ * @{
+ */
+
+/*!
+ * @brief Initializes the LPUART handle.
+ *
+ * This function initializes the LPUART handle, which can be used for other LPUART
+ * transactional APIs. Usually, for a specified LPUART instance,
+ * call this API once to get the initialized handle.
+ *
+ * The LPUART driver supports the "background" receiving, which means that user can set up
+ * an RX ring buffer optionally. Data received is stored into the ring buffer even when the
+ * user doesn't call the LPUART_TransferReceiveNonBlocking() API. If there is already data received
+ * in the ring buffer, the user can get the received data from the ring buffer directly.
+ * The ring buffer is disabled if passing NULL as @p ringBuffer.
+ *
+ * @param base LPUART peripheral base address.
+ * @param handle LPUART handle pointer.
+ * @param callback Callback function.
+ * @param userData User data.
+ */
+void LPUART_TransferCreateHandle(LPUART_Type *base,
+                                 lpuart_handle_t *handle,
+                                 lpuart_transfer_callback_t callback,
+                                 void *userData);
+/*!
+ * @brief Transmits a buffer of data using the interrupt method.
+ *
+ * This function send data using an interrupt method. This is a non-blocking function, which
+ * returns directly without waiting for all data written to the transmitter register. When
+ * all data is written to the TX register in the ISR, the LPUART driver calls the callback
+ * function and passes the @ref kStatus_LPUART_TxIdle as status parameter.
+ *
+ * @note The kStatus_LPUART_TxIdle is passed to the upper layer when all data are written
+ * to the TX register. However, there is no check to ensure that all the data sent out. Before disabling the TX,
+ * check the kLPUART_TransmissionCompleteFlag to ensure that the transmit is finished.
+ *
+ * @param base LPUART peripheral base address.
+ * @param handle LPUART handle pointer.
+ * @param xfer LPUART transfer structure, see #lpuart_transfer_t.
+ * @retval kStatus_Success Successfully start the data transmission.
+ * @retval kStatus_LPUART_TxBusy Previous transmission still not finished, data not all written to the TX register.
+ * @retval kStatus_InvalidArgument Invalid argument.
+ */
+status_t LPUART_TransferSendNonBlocking(LPUART_Type *base, lpuart_handle_t *handle, lpuart_transfer_t *xfer);
+
+/*!
+ * @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_TransferReceiveNonBlocking() API. If there is already data received
+ * in the ring buffer, the user can get the received data from the ring buffer directly.
+ *
+ * @note When using RX ring buffer, one byte is reserved for internal use. In other
+ * words, if @p ringBufferSize is 32, then only 31 bytes are used for saving data.
+ *
+ * @param base LPUART peripheral base address.
+ * @param handle LPUART handle pointer.
+ * @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 LPUART_TransferStartRingBuffer(LPUART_Type *base,
+                                    lpuart_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 LPUART peripheral base address.
+ * @param handle LPUART handle pointer.
+ */
+void LPUART_TransferStopRingBuffer(LPUART_Type *base, lpuart_handle_t *handle);
+
+/*!
+ * @brief Aborts the interrupt-driven data transmit.
+ *
+ * This function aborts the interrupt driven data sending. The user can get the remainBtyes to find out
+ * how many bytes are not sent out.
+ *
+ * @param base LPUART peripheral base address.
+ * @param handle LPUART handle pointer.
+ */
+void LPUART_TransferAbortSend(LPUART_Type *base, lpuart_handle_t *handle);
+
+/*!
+ * @brief Gets the number of bytes that have been written to the LPUART transmitter register.
+ *
+ * This function gets the number of bytes that have been written to LPUART TX
+ * register by an interrupt method.
+ *
+ * @param base LPUART peripheral base address.
+ * @param handle LPUART handle pointer.
+ * @param count Send bytes count.
+ * @retval kStatus_NoTransferInProgress No send in progress.
+ * @retval kStatus_InvalidArgument Parameter is invalid.
+ * @retval kStatus_Success Get successfully through the parameter \p count;
+ */
+status_t LPUART_TransferGetSendCount(LPUART_Type *base, lpuart_handle_t *handle, uint32_t *count);
+
+/*!
+ * @brief Receives a buffer of data using the interrupt method.
+ *
+ * This function receives data using an interrupt method. This is a non-blocking function
+ * which returns without waiting to ensure that all data are received.
+ * If the RX ring buffer is used and not empty, the data in the 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 the ring buffer is not enough for read, the receive
+ * request is saved by the LPUART driver. When the new data arrives, the receive request
+ * is serviced first. When all data is received, the LPUART driver notifies the upper layer
+ * through a callback function and passes a status parameter @ref kStatus_UART_RxIdle.
+ * For example, the upper layer needs 10 bytes but there are only 5 bytes in ring buffer.
+ * The 5 bytes are copied to xfer->data, which returns with the
+ * parameter @p receivedBytes set to 5. For the remaining 5 bytes, the newly arrived data is
+ * saved from xfer->data[5]. When 5 bytes are received, the LPUART driver notifies the 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 LPUART peripheral base address.
+ * @param handle LPUART handle pointer.
+ * @param xfer LPUART transfer structure, see #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_LPUART_RxBusy Previous receive request is not finished.
+ * @retval kStatus_InvalidArgument Invalid argument.
+ */
+status_t LPUART_TransferReceiveNonBlocking(LPUART_Type *base,
+                                           lpuart_handle_t *handle,
+                                           lpuart_transfer_t *xfer,
+                                           size_t *receivedBytes);
+
+/*!
+ * @brief Aborts the interrupt-driven data receiving.
+ *
+ * This function aborts the interrupt-driven data receiving. The user can get the remainBytes to find out
+ * how many bytes not received yet.
+ *
+ * @param base LPUART peripheral base address.
+ * @param handle LPUART handle pointer.
+ */
+void LPUART_TransferAbortReceive(LPUART_Type *base, lpuart_handle_t *handle);
+
+/*!
+ * @brief Gets the number of bytes that have been received.
+ *
+ * This function gets the number of bytes that have been received.
+ *
+ * @param base LPUART peripheral base address.
+ * @param handle LPUART handle pointer.
+ * @param count Receive bytes count.
+ * @retval kStatus_NoTransferInProgress No receive in progress.
+ * @retval kStatus_InvalidArgument Parameter is invalid.
+ * @retval kStatus_Success Get successfully through the parameter \p count;
+ */
+status_t LPUART_TransferGetReceiveCount(LPUART_Type *base, lpuart_handle_t *handle, uint32_t *count);
+
+/*!
+ * @brief LPUART IRQ handle function.
+ *
+ * This function handles the LPUART transmit and receive IRQ request.
+ *
+ * @param base LPUART peripheral base address.
+ * @param handle LPUART handle pointer.
+ */
+void LPUART_TransferHandleIRQ(LPUART_Type *base, lpuart_handle_t *handle);
+
+/*!
+ * @brief LPUART Error IRQ handle function.
+ *
+ * This function handles the LPUART error IRQ request.
+ *
+ * @param base LPUART peripheral base address.
+ * @param handle LPUART handle pointer.
+ */
+void LPUART_TransferHandleErrorIRQ(LPUART_Type *base, lpuart_handle_t *handle);
+
+/* @} */
+
+#if defined(__cplusplus)
+}
+#endif
+
+/*! @}*/
+
+#endif /* _FSL_LPUART_H_ */