/* * Copyright (c) 2015-2016, Freescale Semiconductor, Inc. * Copyright 2016-2021 NXP * All rights reserved. * * SPDX-License-Identifier: BSD-3-Clause */ #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. */ #define FSL_FLEXIO_UART_DRIVER_VERSION (MAKE_VERSION(2, 4, 0)) /*@}*/ /*! @brief Retry times for waiting flag. */ #ifndef UART_RETRY_TIMES #define UART_RETRY_TIMES 0U /* Defining to zero means to keep waiting for the flag until it is assert/deassert. */ #endif /*! @brief Error codes for the UART driver. */ enum { 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. */ kStatus_FLEXIO_UART_Timeout = MAKE_STATUS(kStatusGroup_FLEXIO_UART, 7), /*!< UART times out. */ kStatus_FLEXIO_UART_BaudrateNotSupport = MAKE_STATUS(kStatusGroup_FLEXIO_UART, 8) /*!< Baudrate is not supported in current clock source */ }; /*! @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 { /* * Use separate TX and RX data pointer, because TX data is const data. * The member data is kept for backward compatibility. */ union { uint8_t *data; /*!< The buffer of data to be transfer.*/ uint8_t *rxData; /*!< The buffer to receive data. */ const uint8_t *txData; /*!< The buffer of data to be sent. */ }; 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 { const 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_FLEXIO_UART_BaudrateNotSupport Baudrate is not supported for current clock source frequency. */ 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, 1UL << 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, 1UL << 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 = (uint8_t)(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. * @retval kStatus_FLEXIO_UART_Timeout Transmission timed out and was aborted. * @retval kStatus_Success Successfully wrote all data. */ status_t 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. * @retval kStatus_FLEXIO_UART_Timeout Transmission timed out and was aborted. * @retval kStatus_Success Successfully received all data. */ status_t 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 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_*/