178 lines
6.5 KiB
C
178 lines
6.5 KiB
C
/*
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* The Clear BSD License
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* Copyright (c) 2015, Freescale Semiconductor, Inc.
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* Copyright 2016-2017 NXP
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* All rights reserved.
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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 (subject to the limitations in the disclaimer below) provided
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* 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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* NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE GRANTED BY THIS LICENSE.
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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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#include "fsl_flexcan_edma.h"
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/*******************************************************************************
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* Definitions
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******************************************************************************/
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/* Component ID definition, used by tools. */
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#ifndef FSL_COMPONENT_ID
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#define FSL_COMPONENT_ID "platform.drivers.flexcan_edma"
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#endif
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/*<! Structure definition for flexcan_edma_private_handle_t. The structure is private. */
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typedef struct _flexcan_edma_private_handle
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{
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CAN_Type *base;
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flexcan_edma_handle_t *handle;
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} flexcan_edma_private_handle_t;
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/* FlexCAN EDMA transfer handle. */
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enum _flexcan_edma_tansfer_state
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{
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KFLEXCAN_RxFifoIdle = 0U, /* Rx Fifo idle. */
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KFLEXCAN_RxFifoBusy = 1U, /* Rx Fifo busy. */
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};
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/*******************************************************************************
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* Variables
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******************************************************************************/
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/*<! Private handle only used for internally. */
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static flexcan_edma_private_handle_t s_edmaPrivateHandle[FSL_FEATURE_SOC_FLEXCAN_COUNT];
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/*******************************************************************************
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* Prototypes
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******************************************************************************/
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/*!
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* @brief FlexCAN EDMA receive finished callback function.
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*
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* This function is called when FlexCAN Rx FIFO EDMA receive finished.
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* It disables the FlexCAN Rx FIFO EDMA request and sends
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* @ref kStatus_FLEXCAN_RxFifoIdle to FlexCAN EDMA callback.
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*
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* @param handle The EDMA handle.
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* @param param Callback function parameter.
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*/
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static void FLEXCAN_ReceiveFifoEDMACallback(edma_handle_t *handle, void *param, bool transferDone, uint32_t tcds);
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/*******************************************************************************
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* Code
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******************************************************************************/
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static void FLEXCAN_ReceiveFifoEDMACallback(edma_handle_t *handle, void *param, bool transferDone, uint32_t tcds)
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{
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handle = handle;
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tcds = tcds;
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flexcan_edma_private_handle_t *flexcanPrivateHandle = (flexcan_edma_private_handle_t *)param;
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if (transferDone)
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{
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/* Disable transfer. */
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FLEXCAN_TransferAbortReceiveFifoEDMA(flexcanPrivateHandle->base, flexcanPrivateHandle->handle);
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if (flexcanPrivateHandle->handle->callback)
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{
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flexcanPrivateHandle->handle->callback(flexcanPrivateHandle->base, flexcanPrivateHandle->handle,
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kStatus_FLEXCAN_RxFifoIdle, flexcanPrivateHandle->handle->userData);
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}
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}
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}
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void FLEXCAN_TransferCreateHandleEDMA(CAN_Type *base,
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flexcan_edma_handle_t *handle,
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flexcan_edma_transfer_callback_t callback,
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void *userData,
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edma_handle_t *rxFifoEdmaHandle)
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{
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assert(handle);
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uint32_t instance = FLEXCAN_GetInstance(base);
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s_edmaPrivateHandle[instance].base = base;
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s_edmaPrivateHandle[instance].handle = handle;
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memset(handle, 0, sizeof(flexcan_edma_handle_t));
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handle->rxFifoState = KFLEXCAN_RxFifoIdle;
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handle->rxFifoEdmaHandle = rxFifoEdmaHandle;
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/* Register Callback. */
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handle->callback = callback;
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handle->userData = userData;
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/* Configure Rx FIFO DMA. */
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EDMA_SetCallback(handle->rxFifoEdmaHandle, FLEXCAN_ReceiveFifoEDMACallback, &s_edmaPrivateHandle[instance]);
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}
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status_t FLEXCAN_TransferReceiveFifoEDMA(CAN_Type *base, flexcan_edma_handle_t *handle, flexcan_fifo_transfer_t *xfer)
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{
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assert(handle->rxFifoEdmaHandle);
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edma_transfer_config_t dmaXferConfig;
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status_t status;
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/* If previous Rx FIFO receive not finished. */
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if (KFLEXCAN_RxFifoBusy == handle->rxFifoState)
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{
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status = kStatus_FLEXCAN_RxFifoBusy;
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}
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else
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{
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handle->rxFifoState = KFLEXCAN_RxFifoBusy;
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/* Prepare transfer. */
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EDMA_PrepareTransfer(&dmaXferConfig, (void *)FLEXCAN_GetRxFifoHeadAddr(base), sizeof(flexcan_frame_t),
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(void *)xfer->frame, sizeof(uint32_t), sizeof(flexcan_frame_t), sizeof(flexcan_frame_t),
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kEDMA_PeripheralToMemory);
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/* Submit transfer. */
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EDMA_SubmitTransfer(handle->rxFifoEdmaHandle, &dmaXferConfig);
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EDMA_StartTransfer(handle->rxFifoEdmaHandle);
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/* Enable FlexCAN Rx FIFO EDMA. */
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FLEXCAN_EnableRxFifoDMA(base, true);
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status = kStatus_Success;
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}
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return status;
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}
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void FLEXCAN_TransferAbortReceiveFifoEDMA(CAN_Type *base, flexcan_edma_handle_t *handle)
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{
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assert(handle->rxFifoEdmaHandle);
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/* Disable FlexCAN Rx FIFO EDMA. */
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FLEXCAN_EnableRxFifoDMA(base, false);
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/* Stop transfer. */
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EDMA_AbortTransfer(handle->rxFifoEdmaHandle);
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handle->rxFifoState = KFLEXCAN_RxFifoIdle;
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}
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