369 lines
11 KiB
C
369 lines
11 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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#include "fsl_uart_edma.h"
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#include "fsl_dmamux.h"
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/*******************************************************************************
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* Definitions
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******************************************************************************/
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/* Array of UART handle. */
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#if (defined(UART5))
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#define UART_HANDLE_ARRAY_SIZE 6
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#else /* UART5 */
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#if (defined(UART4))
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#define UART_HANDLE_ARRAY_SIZE 5
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#else /* UART4 */
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#if (defined(UART3))
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#define UART_HANDLE_ARRAY_SIZE 4
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#else /* UART3 */
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#if (defined(UART2))
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#define UART_HANDLE_ARRAY_SIZE 3
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#else /* UART2 */
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#if (defined(UART1))
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#define UART_HANDLE_ARRAY_SIZE 2
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#else /* UART1 */
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#if (defined(UART0))
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#define UART_HANDLE_ARRAY_SIZE 1
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#else /* UART0 */
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#error No UART instance.
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#endif /* UART 0 */
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#endif /* UART 1 */
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#endif /* UART 2 */
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#endif /* UART 3 */
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#endif /* UART 4 */
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#endif /* UART 5 */
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/*<! Structure definition for uart_edma_private_handle_t. The structure is private. */
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typedef struct _uart_edma_private_handle
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{
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UART_Type *base;
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uart_edma_handle_t *handle;
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} uart_edma_private_handle_t;
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/* UART EDMA transfer handle. */
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enum _uart_edma_tansfer_states
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{
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kUART_TxIdle, /* TX idle. */
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kUART_TxBusy, /* TX busy. */
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kUART_RxIdle, /* RX idle. */
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kUART_RxBusy /* RX busy. */
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};
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/*******************************************************************************
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* Definitions
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******************************************************************************/
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/*<! Private handle only used for internally. */
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static uart_edma_private_handle_t s_edmaPrivateHandle[UART_HANDLE_ARRAY_SIZE];
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/*******************************************************************************
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* Prototypes
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******************************************************************************/
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/*!
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* @brief UART EDMA send finished callback function.
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*
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* This function is called when UART EDMA send finished. It disables the UART
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* TX EDMA request and sends @ref kStatus_UART_TxIdle to UART 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 UART_SendEDMACallback(edma_handle_t *handle, void *param, bool transferDone, uint32_t tcds);
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/*!
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* @brief UART EDMA receive finished callback function.
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*
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* This function is called when UART EDMA receive finished. It disables the UART
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* RX EDMA request and sends @ref kStatus_UART_RxIdle to UART 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 UART_ReceiveEDMACallback(edma_handle_t *handle, void *param, bool transferDone, uint32_t tcds);
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/*!
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* @brief Get the UART instance from peripheral base address.
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*
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* @param base UART peripheral base address.
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* @return UART instance.
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*/
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extern uint32_t UART_GetInstance(UART_Type *base);
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/*******************************************************************************
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* Code
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******************************************************************************/
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static void UART_SendEDMACallback(edma_handle_t *handle, void *param, bool transferDone, uint32_t tcds)
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{
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assert(param);
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uart_edma_private_handle_t *uartPrivateHandle = (uart_edma_private_handle_t *)param;
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/* Avoid the warning for unused variables. */
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handle = handle;
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tcds = tcds;
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if (transferDone)
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{
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UART_TransferAbortSendEDMA(uartPrivateHandle->base, uartPrivateHandle->handle);
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if (uartPrivateHandle->handle->callback)
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{
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uartPrivateHandle->handle->callback(uartPrivateHandle->base, uartPrivateHandle->handle, kStatus_UART_TxIdle,
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uartPrivateHandle->handle->userData);
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}
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}
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}
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static void UART_ReceiveEDMACallback(edma_handle_t *handle, void *param, bool transferDone, uint32_t tcds)
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{
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assert(param);
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uart_edma_private_handle_t *uartPrivateHandle = (uart_edma_private_handle_t *)param;
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/* Avoid warning for unused parameters. */
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handle = handle;
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tcds = tcds;
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if (transferDone)
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{
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/* Disable transfer. */
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UART_TransferAbortReceiveEDMA(uartPrivateHandle->base, uartPrivateHandle->handle);
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if (uartPrivateHandle->handle->callback)
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{
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uartPrivateHandle->handle->callback(uartPrivateHandle->base, uartPrivateHandle->handle, kStatus_UART_RxIdle,
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uartPrivateHandle->handle->userData);
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}
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}
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}
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void UART_TransferCreateHandleEDMA(UART_Type *base,
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uart_edma_handle_t *handle,
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uart_edma_transfer_callback_t callback,
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void *userData,
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edma_handle_t *txEdmaHandle,
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edma_handle_t *rxEdmaHandle)
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{
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assert(handle);
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uint32_t instance = UART_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(*handle));
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handle->rxState = kUART_RxIdle;
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handle->txState = kUART_TxIdle;
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handle->rxEdmaHandle = rxEdmaHandle;
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handle->txEdmaHandle = txEdmaHandle;
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handle->callback = callback;
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handle->userData = userData;
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#if defined(FSL_FEATURE_UART_HAS_FIFO) && FSL_FEATURE_UART_HAS_FIFO
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/* Note:
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Take care of the RX FIFO, EDMA request only assert when received bytes
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equal or more than RX water mark, there is potential issue if RX water
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mark larger than 1.
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For example, if RX FIFO water mark is 2, upper layer needs 5 bytes and
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5 bytes are received. the last byte will be saved in FIFO but not trigger
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EDMA transfer because the water mark is 2.
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*/
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if (rxEdmaHandle)
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{
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base->RWFIFO = 1U;
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}
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#endif
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/* Configure TX. */
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if (txEdmaHandle)
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{
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EDMA_SetCallback(handle->txEdmaHandle, UART_SendEDMACallback, &s_edmaPrivateHandle[instance]);
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}
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/* Configure RX. */
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if (rxEdmaHandle)
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{
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EDMA_SetCallback(handle->rxEdmaHandle, UART_ReceiveEDMACallback, &s_edmaPrivateHandle[instance]);
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}
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}
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status_t UART_SendEDMA(UART_Type *base, uart_edma_handle_t *handle, uart_transfer_t *xfer)
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{
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assert(handle);
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assert(handle->txEdmaHandle);
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assert(xfer);
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assert(xfer->data);
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assert(xfer->dataSize);
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edma_transfer_config_t xferConfig;
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status_t status;
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/* If previous TX not finished. */
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if (kUART_TxBusy == handle->txState)
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{
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status = kStatus_UART_TxBusy;
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}
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else
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{
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handle->txState = kUART_TxBusy;
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handle->txDataSizeAll = xfer->dataSize;
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/* Prepare transfer. */
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EDMA_PrepareTransfer(&xferConfig, xfer->data, sizeof(uint8_t), (void *)UART_GetDataRegisterAddress(base),
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sizeof(uint8_t), sizeof(uint8_t), xfer->dataSize, kEDMA_MemoryToPeripheral);
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/* Store the initially configured eDMA minor byte transfer count into the UART handle */
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handle->nbytes = sizeof(uint8_t);
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/* Submit transfer. */
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EDMA_SubmitTransfer(handle->txEdmaHandle, &xferConfig);
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EDMA_StartTransfer(handle->txEdmaHandle);
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/* Enable UART TX EDMA. */
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UART_EnableTxDMA(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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status_t UART_ReceiveEDMA(UART_Type *base, uart_edma_handle_t *handle, uart_transfer_t *xfer)
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{
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assert(handle);
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assert(handle->rxEdmaHandle);
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assert(xfer);
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assert(xfer->data);
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assert(xfer->dataSize);
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edma_transfer_config_t xferConfig;
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status_t status;
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/* If previous RX not finished. */
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if (kUART_RxBusy == handle->rxState)
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{
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status = kStatus_UART_RxBusy;
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}
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else
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{
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handle->rxState = kUART_RxBusy;
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handle->rxDataSizeAll = xfer->dataSize;
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/* Prepare transfer. */
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EDMA_PrepareTransfer(&xferConfig, (void *)UART_GetDataRegisterAddress(base), sizeof(uint8_t), xfer->data,
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sizeof(uint8_t), sizeof(uint8_t), xfer->dataSize, kEDMA_PeripheralToMemory);
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/* Store the initially configured eDMA minor byte transfer count into the UART handle */
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handle->nbytes = sizeof(uint8_t);
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/* Submit transfer. */
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EDMA_SubmitTransfer(handle->rxEdmaHandle, &xferConfig);
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EDMA_StartTransfer(handle->rxEdmaHandle);
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/* Enable UART RX EDMA. */
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UART_EnableRxDMA(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 UART_TransferAbortSendEDMA(UART_Type *base, uart_edma_handle_t *handle)
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{
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assert(handle);
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assert(handle->txEdmaHandle);
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/* Disable UART TX EDMA. */
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UART_EnableTxDMA(base, false);
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/* Stop transfer. */
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EDMA_AbortTransfer(handle->txEdmaHandle);
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handle->txState = kUART_TxIdle;
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}
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void UART_TransferAbortReceiveEDMA(UART_Type *base, uart_edma_handle_t *handle)
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{
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assert(handle);
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assert(handle->rxEdmaHandle);
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/* Disable UART RX EDMA. */
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UART_EnableRxDMA(base, false);
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/* Stop transfer. */
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EDMA_AbortTransfer(handle->rxEdmaHandle);
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handle->rxState = kUART_RxIdle;
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}
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status_t UART_TransferGetReceiveCountEDMA(UART_Type *base, uart_edma_handle_t *handle, uint32_t *count)
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{
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assert(handle);
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assert(handle->rxEdmaHandle);
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assert(count);
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if (kUART_RxIdle == handle->rxState)
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{
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return kStatus_NoTransferInProgress;
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}
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*count = handle->rxDataSizeAll -
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(uint32_t)handle->nbytes *
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EDMA_GetRemainingMajorLoopCount(handle->rxEdmaHandle->base, handle->rxEdmaHandle->channel);
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return kStatus_Success;
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}
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status_t UART_TransferGetSendCountEDMA(UART_Type *base, uart_edma_handle_t *handle, uint32_t *count)
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{
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assert(handle);
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assert(handle->txEdmaHandle);
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assert(count);
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if (kUART_TxIdle == handle->txState)
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{
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return kStatus_NoTransferInProgress;
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}
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*count = handle->txDataSizeAll -
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(uint32_t)handle->nbytes *
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EDMA_GetRemainingMajorLoopCount(handle->txEdmaHandle->base, handle->txEdmaHandle->channel);
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return kStatus_Success;
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}
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