174 lines
7.4 KiB
C
174 lines
7.4 KiB
C
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/*
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* Copyright (c) 2015, Freescale Semiconductor, Inc.
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* Copyright 2016-2017 NXP
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* o Redistributions of source code must retain the above copyright notice, this list
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* of conditions and the following disclaimer.
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*
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* o Redistributions in binary form must reproduce the above copyright notice, this
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* list of conditions and the following disclaimer in the documentation and/or
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* other materials provided with the distribution.
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*
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* o Neither the name of the copyright holder nor the names of its
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* contributors may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _FSL_LPI2C_EDMA_H_
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#define _FSL_LPI2C_EDMA_H_
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#include "fsl_lpi2c.h"
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#include "fsl_edma.h"
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/*******************************************************************************
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* Definitions
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******************************************************************************/
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/*!
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* @addtogroup lpi2c_master_edma_driver
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* @{
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*/
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/* Forward declaration of the transfer descriptor and handle typedefs. */
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typedef struct _lpi2c_master_edma_handle lpi2c_master_edma_handle_t;
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/*!
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* @brief Master DMA completion callback function pointer type.
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*
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* This callback is used only for the non-blocking master transfer API. Specify the callback you wish to use
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* in the call to LPI2C_MasterCreateEDMAHandle().
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*
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* @param base The LPI2C peripheral base address.
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* @param handle Handle associated with the completed transfer.
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* @param completionStatus Either #kStatus_Success or an error code describing how the transfer completed.
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* @param userData Arbitrary pointer-sized value passed from the application.
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*/
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typedef void (*lpi2c_master_edma_transfer_callback_t)(LPI2C_Type *base,
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lpi2c_master_edma_handle_t *handle,
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status_t completionStatus,
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void *userData);
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/*!
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* @brief Driver handle for master DMA APIs.
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* @note The contents of this structure are private and subject to change.
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*/
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struct _lpi2c_master_edma_handle
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{
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LPI2C_Type *base; /*!< LPI2C base pointer. */
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bool isBusy; /*!< Transfer state machine current state. */
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uint8_t nbytes; /*!< eDMA minor byte transfer count initially configured. */
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uint16_t commandBuffer[7]; /*!< LPI2C command sequence. */
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lpi2c_master_transfer_t transfer; /*!< Copy of the current transfer info. */
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lpi2c_master_edma_transfer_callback_t completionCallback; /*!< Callback function pointer. */
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void *userData; /*!< Application data passed to callback. */
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edma_handle_t *rx; /*!< Handle for receive DMA channel. */
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edma_handle_t *tx; /*!< Handle for transmit DMA channel. */
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edma_tcd_t tcds[2]; /*!< Software TCD. Two are allocated to provide enough room to align to 32-bytes. */
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};
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/*! @} */
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/*******************************************************************************
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* API
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******************************************************************************/
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#if defined(__cplusplus)
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extern "C" {
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#endif
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/*!
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* @addtogroup lpi2c_master_edma_driver
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* @{
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*/
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/*! @name Master DMA */
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/*@{*/
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/*!
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* @brief Create a new handle for the LPI2C master DMA APIs.
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*
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* The creation of a handle is for use with the DMA APIs. Once a handle
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* is created, there is not a corresponding destroy handle. If the user wants to
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* terminate a transfer, the LPI2C_MasterTransferAbortEDMA() API shall be called.
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*
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* For devices where the LPI2C send and receive DMA requests are OR'd together, the @a txDmaHandle
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* parameter is ignored and may be set to NULL.
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*
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* @param base The LPI2C peripheral base address.
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* @param[out] handle Pointer to the LPI2C master driver handle.
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* @param rxDmaHandle Handle for the eDMA receive channel. Created by the user prior to calling this function.
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* @param txDmaHandle Handle for the eDMA transmit channel. Created by the user prior to calling this function.
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* @param callback User provided pointer to the asynchronous callback function.
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* @param userData User provided pointer to the application callback data.
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*/
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void LPI2C_MasterCreateEDMAHandle(LPI2C_Type *base,
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lpi2c_master_edma_handle_t *handle,
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edma_handle_t *rxDmaHandle,
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edma_handle_t *txDmaHandle,
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lpi2c_master_edma_transfer_callback_t callback,
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void *userData);
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/*!
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* @brief Performs a non-blocking DMA-based transaction on the I2C bus.
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*
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* The callback specified when the @a handle was created is invoked when the transaction has
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* completed.
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*
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* @param base The LPI2C peripheral base address.
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* @param handle Pointer to the LPI2C master driver handle.
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* @param transfer The pointer to the transfer descriptor.
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* @retval #kStatus_Success The transaction was started successfully.
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* @retval #kStatus_LPI2C_Busy Either another master is currently utilizing the bus, or another DMA
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* transaction is already in progress.
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*/
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status_t LPI2C_MasterTransferEDMA(LPI2C_Type *base,
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lpi2c_master_edma_handle_t *handle,
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lpi2c_master_transfer_t *transfer);
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/*!
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* @brief Returns number of bytes transferred so far.
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*
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* @param base The LPI2C peripheral base address.
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* @param handle Pointer to the LPI2C master driver handle.
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* @param[out] count Number of bytes transferred so far by the non-blocking transaction.
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* @retval #kStatus_Success
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* @retval #kStatus_NoTransferInProgress There is not a DMA transaction currently in progress.
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*/
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status_t LPI2C_MasterTransferGetCountEDMA(LPI2C_Type *base, lpi2c_master_edma_handle_t *handle, size_t *count);
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/*!
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* @brief Terminates a non-blocking LPI2C master transmission early.
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*
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* @note It is not safe to call this function from an IRQ handler that has a higher priority than the
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* eDMA peripheral's IRQ priority.
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*
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* @param base The LPI2C peripheral base address.
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* @param handle Pointer to the LPI2C master driver handle.
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* @retval #kStatus_Success A transaction was successfully aborted.
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* @retval #kStatus_LPI2C_Idle There is not a DMA transaction currently in progress.
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*/
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status_t LPI2C_MasterTransferAbortEDMA(LPI2C_Type *base, lpi2c_master_edma_handle_t *handle);
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/*@}*/
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/*! @} */
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#if defined(__cplusplus)
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}
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#endif
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#endif /* _FSL_LPI2C_EDMA_H_ */
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