1 /* 2 * Copyright (c) 2015, Freescale Semiconductor, Inc. 3 * Copyright 2016-2021 NXP 4 * All rights reserved. 5 * 6 * SPDX-License-Identifier: BSD-3-Clause 7 */ 8 #ifndef _FSL_LPI2C_EDMA_H_ 9 #define _FSL_LPI2C_EDMA_H_ 10 11 #include "fsl_lpi2c.h" 12 #include "fsl_edma.h" 13 14 /******************************************************************************* 15 * Definitions 16 ******************************************************************************/ 17 18 /*! @name Driver version */ 19 /*@{*/ 20 /*! @brief LPI2C EDMA driver version. */ 21 #define FSL_LPI2C_EDMA_DRIVER_VERSION (MAKE_VERSION(2, 3, 0)) 22 /*@}*/ 23 24 /*! 25 * @addtogroup lpi2c_master_edma_driver 26 * @{ 27 */ 28 29 /* Forward declaration of the transfer descriptor and handle typedefs. */ 30 typedef struct _lpi2c_master_edma_handle lpi2c_master_edma_handle_t; 31 32 /*! 33 * @brief Master DMA completion callback function pointer type. 34 * 35 * This callback is used only for the non-blocking master transfer API. Specify the callback you wish to use 36 * in the call to LPI2C_MasterCreateEDMAHandle(). 37 * 38 * @param base The LPI2C peripheral base address. 39 * @param handle Handle associated with the completed transfer. 40 * @param completionStatus Either kStatus_Success or an error code describing how the transfer completed. 41 * @param userData Arbitrary pointer-sized value passed from the application. 42 */ 43 typedef void (*lpi2c_master_edma_transfer_callback_t)(LPI2C_Type *base, 44 lpi2c_master_edma_handle_t *handle, 45 status_t completionStatus, 46 void *userData); 47 48 /*! 49 * @brief Driver handle for master DMA APIs. 50 * @note The contents of this structure are private and subject to change. 51 */ 52 struct _lpi2c_master_edma_handle 53 { 54 LPI2C_Type *base; /*!< LPI2C base pointer. */ 55 bool isBusy; /*!< Transfer state machine current state. */ 56 uint8_t nbytes; /*!< eDMA minor byte transfer count initially configured. */ 57 uint16_t commandBuffer[10]; /*!< LPI2C command sequence. When all 10 command words are used: 58 Start&addr&write[1 word] + subaddr[4 words] + restart&addr&read[1 word] + receive&Size[4 words] */ 59 lpi2c_master_transfer_t transfer; /*!< Copy of the current transfer info. */ 60 lpi2c_master_edma_transfer_callback_t completionCallback; /*!< Callback function pointer. */ 61 void *userData; /*!< Application data passed to callback. */ 62 edma_handle_t *rx; /*!< Handle for receive DMA channel. */ 63 edma_handle_t *tx; /*!< Handle for transmit DMA channel. */ 64 edma_tcd_t tcds[3]; /*!< Software TCD. Three are allocated to provide enough room to align to 32-bytes. */ 65 }; 66 67 /*! @} */ 68 69 /******************************************************************************* 70 * API 71 ******************************************************************************/ 72 73 #if defined(__cplusplus) 74 extern "C" { 75 #endif 76 77 /*! 78 * @addtogroup lpi2c_master_edma_driver 79 * @{ 80 */ 81 82 /*! @name Master DMA */ 83 /*@{*/ 84 85 /*! 86 * @brief Create a new handle for the LPI2C master DMA APIs. 87 * 88 * The creation of a handle is for use with the DMA APIs. Once a handle 89 * is created, there is not a corresponding destroy handle. If the user wants to 90 * terminate a transfer, the LPI2C_MasterTransferAbortEDMA() API shall be called. 91 * 92 * For devices where the LPI2C send and receive DMA requests are OR'd together, the @a txDmaHandle 93 * parameter is ignored and may be set to NULL. 94 * 95 * @param base The LPI2C peripheral base address. 96 * @param[out] handle Pointer to the LPI2C master driver handle. 97 * @param rxDmaHandle Handle for the eDMA receive channel. Created by the user prior to calling this function. 98 * @param txDmaHandle Handle for the eDMA transmit channel. Created by the user prior to calling this function. 99 * @param callback User provided pointer to the asynchronous callback function. 100 * @param userData User provided pointer to the application callback data. 101 */ 102 void LPI2C_MasterCreateEDMAHandle(LPI2C_Type *base, 103 lpi2c_master_edma_handle_t *handle, 104 edma_handle_t *rxDmaHandle, 105 edma_handle_t *txDmaHandle, 106 lpi2c_master_edma_transfer_callback_t callback, 107 void *userData); 108 109 /*! 110 * @brief Performs a non-blocking DMA-based transaction on the I2C bus. 111 * 112 * The callback specified when the @a handle was created is invoked when the transaction has 113 * completed. 114 * 115 * @param base The LPI2C peripheral base address. 116 * @param handle Pointer to the LPI2C master driver handle. 117 * @param transfer The pointer to the transfer descriptor. 118 * @retval kStatus_Success The transaction was started successfully. 119 * @retval #kStatus_LPI2C_Busy Either another master is currently utilizing the bus, or another DMA 120 * transaction is already in progress. 121 */ 122 status_t LPI2C_MasterTransferEDMA(LPI2C_Type *base, 123 lpi2c_master_edma_handle_t *handle, 124 lpi2c_master_transfer_t *transfer); 125 126 /*! 127 * @brief Returns number of bytes transferred so far. 128 * 129 * @param base The LPI2C peripheral base address. 130 * @param handle Pointer to the LPI2C master driver handle. 131 * @param[out] count Number of bytes transferred so far by the non-blocking transaction. 132 * @retval kStatus_Success 133 * @retval kStatus_NoTransferInProgress There is not a DMA transaction currently in progress. 134 */ 135 status_t LPI2C_MasterTransferGetCountEDMA(LPI2C_Type *base, lpi2c_master_edma_handle_t *handle, size_t *count); 136 137 /*! 138 * @brief Terminates a non-blocking LPI2C master transmission early. 139 * 140 * @note It is not safe to call this function from an IRQ handler that has a higher priority than the 141 * eDMA peripheral's IRQ priority. 142 * 143 * @param base The LPI2C peripheral base address. 144 * @param handle Pointer to the LPI2C master driver handle. 145 * @retval kStatus_Success A transaction was successfully aborted. 146 * @retval #kStatus_LPI2C_Idle There is not a DMA transaction currently in progress. 147 */ 148 status_t LPI2C_MasterTransferAbortEDMA(LPI2C_Type *base, lpi2c_master_edma_handle_t *handle); 149 150 /*@}*/ 151 152 /*! @} */ 153 154 #if defined(__cplusplus) 155 } 156 #endif 157 158 #endif /* _FSL_LPI2C_EDMA_H_ */ 159
