318 lines
9.6 KiB
C
318 lines
9.6 KiB
C
/*
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* Copyright 2017 NXP
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* All rights reserved.
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*
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include "fsl_usart.h"
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#include "fsl_device_registers.h"
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#include "fsl_dma.h"
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#include "fsl_usart_dma.h"
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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.vusart_dma"
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#endif
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/*<! Structure definition for uart_dma_handle_t. The structure is private. */
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typedef struct _usart_dma_private_handle
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{
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USART_Type *base;
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usart_dma_handle_t *handle;
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} usart_dma_private_handle_t;
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enum _usart_transfer_states
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{
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kUSART_TxIdle, /* TX idle. */
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kUSART_TxBusy, /* TX busy. */
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kUSART_RxIdle, /* RX idle. */
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kUSART_RxBusy /* RX busy. */
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};
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/*<! Private handle only used for internally. */
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static usart_dma_private_handle_t s_dmaPrivateHandle[FSL_FEATURE_SOC_USART_COUNT];
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/*******************************************************************************
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* Prototypes
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******************************************************************************/
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static void USART_TransferSendDMACallback(dma_handle_t *handle, void *param, bool transferDone, uint32_t intmode)
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{
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assert(handle);
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assert(param);
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usart_dma_private_handle_t *usartPrivateHandle = (usart_dma_private_handle_t *)param;
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/* Wait for the transmit is complete, disable UART TX DMA. */
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while (!(kUSART_TxIdleFlag & USART_GetStatusFlags(usartPrivateHandle->base)))
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{
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}
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usartPrivateHandle->handle->txState = kUSART_TxIdle;
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if (usartPrivateHandle->handle->callback)
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{
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usartPrivateHandle->handle->callback(usartPrivateHandle->base, usartPrivateHandle->handle, kStatus_USART_TxIdle,
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usartPrivateHandle->handle->userData);
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}
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}
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static void USART_TransferReceiveDMACallback(dma_handle_t *handle, void *param, bool transferDone, uint32_t intmode)
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{
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assert(handle);
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assert(param);
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usart_dma_private_handle_t *usartPrivateHandle = (usart_dma_private_handle_t *)param;
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usartPrivateHandle->handle->rxState = kUSART_RxIdle;
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if (usartPrivateHandle->handle->callback)
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{
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usartPrivateHandle->handle->callback(usartPrivateHandle->base, usartPrivateHandle->handle, kStatus_USART_RxIdle,
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usartPrivateHandle->handle->userData);
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}
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}
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/*!
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* brief Initializes the USART handle which is used in transactional functions.
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* param base USART peripheral base address.
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* param handle Pointer to usart_dma_handle_t structure.
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* param callback Callback function.
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* param userData User data.
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* param txDmaHandle User-requested DMA handle for TX DMA transfer.
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* param rxDmaHandle User-requested DMA handle for RX DMA transfer.
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*/
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status_t USART_TransferCreateHandleDMA(USART_Type *base,
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usart_dma_handle_t *handle,
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usart_dma_transfer_callback_t callback,
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void *userData,
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dma_handle_t *txDmaHandle,
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dma_handle_t *rxDmaHandle)
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{
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int32_t instance = 0;
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/* check 'base' */
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assert(!(NULL == base));
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if (NULL == base)
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{
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return kStatus_InvalidArgument;
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}
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/* check 'handle' */
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assert(!(NULL == handle));
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if (NULL == handle)
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{
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return kStatus_InvalidArgument;
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}
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instance = USART_GetInstance(base);
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memset(handle, 0, sizeof(*handle));
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/* assign 'base' and 'handle' */
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s_dmaPrivateHandle[instance].base = base;
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s_dmaPrivateHandle[instance].handle = handle;
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/* set tx/rx 'idle' state */
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handle->rxState = kUSART_RxIdle;
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handle->txState = kUSART_TxIdle;
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handle->callback = callback;
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handle->userData = userData;
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handle->rxDmaHandle = rxDmaHandle;
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handle->txDmaHandle = txDmaHandle;
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/* Configure TX. */
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if (txDmaHandle)
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{
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DMA_SetCallback(txDmaHandle, USART_TransferSendDMACallback, &s_dmaPrivateHandle[instance]);
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}
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/* Configure RX. */
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if (rxDmaHandle)
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{
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DMA_SetCallback(rxDmaHandle, USART_TransferReceiveDMACallback, &s_dmaPrivateHandle[instance]);
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}
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return kStatus_Success;
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}
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/*!
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* brief Sends data using DMA.
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*
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* This function sends data using DMA. This is a non-blocking function, which returns
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* right away. When all data is sent, the send callback function is called.
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*
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* param base USART peripheral base address.
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* param handle USART handle pointer.
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* param xfer USART DMA transfer structure. See #usart_transfer_t.
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* retval kStatus_Success if succeed, others failed.
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* retval kStatus_USART_TxBusy Previous transfer on going.
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* retval kStatus_InvalidArgument Invalid argument.
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*/
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status_t USART_TransferSendDMA(USART_Type *base, usart_dma_handle_t *handle, usart_transfer_t *xfer)
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{
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assert(handle);
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assert(handle->txDmaHandle);
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assert(xfer);
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assert(xfer->data);
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assert(xfer->dataSize);
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dma_transfer_config_t xferConfig;
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status_t status;
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uint32_t instance = USART_GetInstance(base);
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/* If previous TX not finished. */
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if (kUSART_TxBusy == handle->txState)
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{
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status = kStatus_USART_TxBusy;
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}
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else
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{
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handle->txState = kUSART_TxBusy;
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handle->txDataSizeAll = xfer->dataSize;
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if (!USART_IsTxFifoEnable(base))
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{
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/* Prepare transfer. */
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DMA_PrepareTransfer(&xferConfig, xfer->data, ((void *)((uint32_t)&base->TXDAT)), sizeof(uint8_t),
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xfer->dataSize, kDMA_MemoryToPeripheral, NULL);
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}
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else
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{
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/* Prepare transfer. */
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DMA_PrepareTransfer(&xferConfig, xfer->data, ((void *)((uint32_t)&VFIFO->USART[instance].TXDATUSART)),
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sizeof(uint8_t), xfer->dataSize, kDMA_MemoryToPeripheral, NULL);
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}
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/* Submit transfer. */
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DMA_SubmitTransfer(handle->txDmaHandle, &xferConfig);
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DMA_StartTransfer(handle->txDmaHandle);
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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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/*!
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* brief Receives data using DMA.
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*
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* This function receives data using DMA. This is a non-blocking function, which returns
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* right away. When all data is received, the receive callback function is called.
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*
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* param base USART peripheral base address.
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* param handle Pointer to usart_dma_handle_t structure.
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* param xfer USART DMA transfer structure. See #usart_transfer_t.
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* retval kStatus_Success if succeed, others failed.
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* retval kStatus_USART_RxBusy Previous transfer on going.
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* retval kStatus_InvalidArgument Invalid argument.
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*/
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status_t USART_TransferReceiveDMA(USART_Type *base, usart_dma_handle_t *handle, usart_transfer_t *xfer)
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{
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assert(handle);
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assert(handle->rxDmaHandle);
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assert(xfer);
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assert(xfer->data);
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assert(xfer->dataSize);
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dma_transfer_config_t xferConfig;
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status_t status;
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uint32_t instance = USART_GetInstance(base);
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/* If previous RX not finished. */
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if (kUSART_RxBusy == handle->rxState)
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{
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status = kStatus_USART_RxBusy;
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}
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else
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{
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handle->rxState = kUSART_RxBusy;
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handle->rxDataSizeAll = xfer->dataSize;
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if (!USART_IsRxFifoEnable(base))
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{
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/* Prepare transfer. */
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DMA_PrepareTransfer(&xferConfig, ((void *)((uint32_t)&base->RXDAT)), xfer->data, sizeof(uint8_t),
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xfer->dataSize, kDMA_PeripheralToMemory, NULL);
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}
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else
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{
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/* Prepare transfer. */
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DMA_PrepareTransfer(&xferConfig, ((void *)((uint32_t)&VFIFO->USART[instance].RXDATUSART)), xfer->data,
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sizeof(uint8_t), xfer->dataSize, kDMA_PeripheralToMemory, NULL);
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}
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/* Submit transfer. */
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DMA_SubmitTransfer(handle->rxDmaHandle, &xferConfig);
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DMA_StartTransfer(handle->rxDmaHandle);
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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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/*!
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* brief Aborts the sent data using DMA.
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*
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* This function aborts send data using DMA.
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*
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* param base USART peripheral base address
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* param handle Pointer to usart_dma_handle_t structure
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*/
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void USART_TransferAbortSendDMA(USART_Type *base, usart_dma_handle_t *handle)
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{
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assert(NULL != handle);
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assert(NULL != handle->txDmaHandle);
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/* Stop transfer. */
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DMA_AbortTransfer(handle->txDmaHandle);
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handle->txState = kUSART_TxIdle;
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}
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/*!
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* brief Aborts the received data using DMA.
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*
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* This function aborts the received data using DMA.
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*
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* param base USART peripheral base address
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* param handle Pointer to usart_dma_handle_t structure
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*/
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void USART_TransferAbortReceiveDMA(USART_Type *base, usart_dma_handle_t *handle)
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{
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assert(NULL != handle);
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assert(NULL != handle->rxDmaHandle);
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/* Stop transfer. */
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DMA_AbortTransfer(handle->rxDmaHandle);
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handle->rxState = kUSART_RxIdle;
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}
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/*!
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* brief Get the number of bytes that have been received.
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*
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* This function gets the number of bytes that have been received.
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*
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* param base USART peripheral base address.
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* param handle USART handle pointer.
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* param count Receive bytes count.
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* retval kStatus_NoTransferInProgress No receive in progress.
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* retval kStatus_InvalidArgument Parameter is invalid.
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* retval kStatus_Success Get successfully through the parameter \p count;
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*/
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status_t USART_TransferGetReceiveCountDMA(USART_Type *base, usart_dma_handle_t *handle, uint32_t *count)
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{
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assert(handle);
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assert(handle->rxDmaHandle);
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assert(count);
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if (kUSART_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 - DMA_GetRemainingBytes(handle->rxDmaHandle->base, handle->rxDmaHandle->channel);
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return kStatus_Success;
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}
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