| /* |
| * Copyright (c) 2015, Freescale Semiconductor, Inc. |
| * Copyright 2016-2017 NXP |
| * All rights reserved. |
| * |
| * SPDX-License-Identifier: BSD-3-Clause |
| */ |
| |
| #include "fsl_sai_edma.h" |
| |
| /* Component ID definition, used by tools. */ |
| #ifndef FSL_COMPONENT_ID |
| #define FSL_COMPONENT_ID "platform.drivers.sai_edma" |
| #endif |
| |
| /******************************************************************************* |
| * Definitations |
| ******************************************************************************/ |
| /* Used for 32byte aligned */ |
| #define STCD_ADDR(address) (edma_tcd_t *)(((uint32_t)(address) + 32) & ~0x1FU) |
| |
| static I2S_Type *const s_saiBases[] = I2S_BASE_PTRS; |
| |
| /*<! Structure definition for uart_edma_private_handle_t. The structure is private. */ |
| typedef struct _sai_edma_private_handle |
| { |
| I2S_Type *base; |
| sai_edma_handle_t *handle; |
| } sai_edma_private_handle_t; |
| |
| enum _sai_edma_transfer_state |
| { |
| kSAI_Busy = 0x0U, /*!< SAI is busy */ |
| kSAI_Idle, /*!< Transfer is done. */ |
| }; |
| |
| /*<! Private handle only used for internally. */ |
| static sai_edma_private_handle_t s_edmaPrivateHandle[ARRAY_SIZE(s_saiBases)][2]; |
| |
| /******************************************************************************* |
| * Prototypes |
| ******************************************************************************/ |
| /*! |
| * @brief Get the instance number for SAI. |
| * |
| * @param base SAI base pointer. |
| */ |
| static uint32_t SAI_GetInstance(I2S_Type *base); |
| |
| /*! |
| * @brief SAI EDMA callback for send. |
| * |
| * @param handle pointer to sai_edma_handle_t structure which stores the transfer state. |
| * @param userData Parameter for user callback. |
| * @param done If the DMA transfer finished. |
| * @param tcds The TCD index. |
| */ |
| static void SAI_TxEDMACallback(edma_handle_t *handle, void *userData, bool done, uint32_t tcds); |
| |
| /*! |
| * @brief SAI EDMA callback for receive. |
| * |
| * @param handle pointer to sai_edma_handle_t structure which stores the transfer state. |
| * @param userData Parameter for user callback. |
| * @param done If the DMA transfer finished. |
| * @param tcds The TCD index. |
| */ |
| static void SAI_RxEDMACallback(edma_handle_t *handle, void *userData, bool done, uint32_t tcds); |
| |
| /******************************************************************************* |
| * Code |
| ******************************************************************************/ |
| static uint32_t SAI_GetInstance(I2S_Type *base) |
| { |
| uint32_t instance; |
| |
| /* Find the instance index from base address mappings. */ |
| for (instance = 0; instance < ARRAY_SIZE(s_saiBases); instance++) |
| { |
| if (s_saiBases[instance] == base) |
| { |
| break; |
| } |
| } |
| |
| assert(instance < ARRAY_SIZE(s_saiBases)); |
| |
| return instance; |
| } |
| |
| static void SAI_TxEDMACallback(edma_handle_t *handle, void *userData, bool done, uint32_t tcds) |
| { |
| sai_edma_private_handle_t *privHandle = (sai_edma_private_handle_t *)userData; |
| sai_edma_handle_t *saiHandle = privHandle->handle; |
| |
| /* If finished a blcok, call the callback function */ |
| memset(&saiHandle->saiQueue[saiHandle->queueDriver], 0, sizeof(sai_transfer_t)); |
| saiHandle->queueDriver = (saiHandle->queueDriver + 1) % SAI_XFER_QUEUE_SIZE; |
| if (saiHandle->callback) |
| { |
| (saiHandle->callback)(privHandle->base, saiHandle, kStatus_SAI_TxIdle, saiHandle->userData); |
| } |
| |
| /* If all data finished, just stop the transfer */ |
| if (saiHandle->saiQueue[saiHandle->queueDriver].data == NULL) |
| { |
| /* Disable DMA enable bit */ |
| SAI_TxEnableDMA(privHandle->base, kSAI_FIFORequestDMAEnable, false); |
| EDMA_AbortTransfer(handle); |
| } |
| } |
| |
| static void SAI_RxEDMACallback(edma_handle_t *handle, void *userData, bool done, uint32_t tcds) |
| { |
| sai_edma_private_handle_t *privHandle = (sai_edma_private_handle_t *)userData; |
| sai_edma_handle_t *saiHandle = privHandle->handle; |
| |
| /* If finished a blcok, call the callback function */ |
| memset(&saiHandle->saiQueue[saiHandle->queueDriver], 0, sizeof(sai_transfer_t)); |
| saiHandle->queueDriver = (saiHandle->queueDriver + 1) % SAI_XFER_QUEUE_SIZE; |
| if (saiHandle->callback) |
| { |
| (saiHandle->callback)(privHandle->base, saiHandle, kStatus_SAI_RxIdle, saiHandle->userData); |
| } |
| |
| /* If all data finished, just stop the transfer */ |
| if (saiHandle->saiQueue[saiHandle->queueDriver].data == NULL) |
| { |
| /* Disable DMA enable bit */ |
| SAI_RxEnableDMA(privHandle->base, kSAI_FIFORequestDMAEnable, false); |
| EDMA_AbortTransfer(handle); |
| } |
| } |
| |
| /*! |
| * brief Initializes the SAI eDMA handle. |
| * |
| * This function initializes the SAI master DMA handle, which can be used for other SAI master transactional APIs. |
| * Usually, for a specified SAI instance, call this API once to get the initialized handle. |
| * |
| * param base SAI base pointer. |
| * param handle SAI eDMA handle pointer. |
| * param base SAI peripheral base address. |
| * param callback Pointer to user callback function. |
| * param userData User parameter passed to the callback function. |
| * param dmaHandle eDMA handle pointer, this handle shall be static allocated by users. |
| */ |
| void SAI_TransferTxCreateHandleEDMA( |
| I2S_Type *base, sai_edma_handle_t *handle, sai_edma_callback_t callback, void *userData, edma_handle_t *dmaHandle) |
| { |
| assert(handle && dmaHandle); |
| |
| uint32_t instance = SAI_GetInstance(base); |
| |
| /* Zero the handle */ |
| memset(handle, 0, sizeof(*handle)); |
| |
| /* Set sai base to handle */ |
| handle->dmaHandle = dmaHandle; |
| handle->callback = callback; |
| handle->userData = userData; |
| |
| /* Set SAI state to idle */ |
| handle->state = kSAI_Idle; |
| |
| s_edmaPrivateHandle[instance][0].base = base; |
| s_edmaPrivateHandle[instance][0].handle = handle; |
| |
| /* Need to use scatter gather */ |
| EDMA_InstallTCDMemory(dmaHandle, (edma_tcd_t *)(STCD_ADDR(handle->tcd)), SAI_XFER_QUEUE_SIZE); |
| |
| /* Install callback for Tx dma channel */ |
| EDMA_SetCallback(dmaHandle, SAI_TxEDMACallback, &s_edmaPrivateHandle[instance][0]); |
| } |
| |
| /*! |
| * brief Initializes the SAI Rx eDMA handle. |
| * |
| * This function initializes the SAI slave DMA handle, which can be used for other SAI master transactional APIs. |
| * Usually, for a specified SAI instance, call this API once to get the initialized handle. |
| * |
| * param base SAI base pointer. |
| * param handle SAI eDMA handle pointer. |
| * param base SAI peripheral base address. |
| * param callback Pointer to user callback function. |
| * param userData User parameter passed to the callback function. |
| * param dmaHandle eDMA handle pointer, this handle shall be static allocated by users. |
| */ |
| void SAI_TransferRxCreateHandleEDMA( |
| I2S_Type *base, sai_edma_handle_t *handle, sai_edma_callback_t callback, void *userData, edma_handle_t *dmaHandle) |
| { |
| assert(handle && dmaHandle); |
| |
| uint32_t instance = SAI_GetInstance(base); |
| |
| /* Zero the handle */ |
| memset(handle, 0, sizeof(*handle)); |
| |
| /* Set sai base to handle */ |
| handle->dmaHandle = dmaHandle; |
| handle->callback = callback; |
| handle->userData = userData; |
| |
| /* Set SAI state to idle */ |
| handle->state = kSAI_Idle; |
| |
| s_edmaPrivateHandle[instance][1].base = base; |
| s_edmaPrivateHandle[instance][1].handle = handle; |
| |
| /* Need to use scatter gather */ |
| EDMA_InstallTCDMemory(dmaHandle, STCD_ADDR(handle->tcd), SAI_XFER_QUEUE_SIZE); |
| |
| /* Install callback for Tx dma channel */ |
| EDMA_SetCallback(dmaHandle, SAI_RxEDMACallback, &s_edmaPrivateHandle[instance][1]); |
| } |
| |
| /*! |
| * brief Configures the SAI Tx audio format. |
| * |
| * The audio format can be changed at run-time. This function configures the sample rate and audio data |
| * format to be transferred. This function also sets the eDMA parameter according to formatting requirements. |
| * |
| * param base SAI base pointer. |
| * param handle SAI eDMA handle pointer. |
| * param format Pointer to SAI audio data format structure. |
| * param mclkSourceClockHz SAI master clock source frequency in Hz. |
| * param bclkSourceClockHz SAI bit clock source frequency in Hz. If bit clock source is master |
| * clock, this value should equals to masterClockHz in format. |
| * retval kStatus_Success Audio format set successfully. |
| * retval kStatus_InvalidArgument The input argument is invalid. |
| */ |
| void SAI_TransferTxSetFormatEDMA(I2S_Type *base, |
| sai_edma_handle_t *handle, |
| sai_transfer_format_t *format, |
| uint32_t mclkSourceClockHz, |
| uint32_t bclkSourceClockHz) |
| { |
| assert(handle && format); |
| |
| /* Configure the audio format to SAI registers */ |
| SAI_TxSetFormat(base, format, mclkSourceClockHz, bclkSourceClockHz); |
| |
| /* Get the tranfer size from format, this should be used in EDMA configuration */ |
| if (format->bitWidth == 24U) |
| { |
| handle->bytesPerFrame = 4U; |
| } |
| else |
| { |
| handle->bytesPerFrame = format->bitWidth / 8U; |
| } |
| |
| /* Update the data channel SAI used */ |
| handle->channel = format->channel; |
| |
| /* Clear the channel enable bits unitl do a send/receive */ |
| base->TCR3 &= ~I2S_TCR3_TCE_MASK; |
| #if defined(FSL_FEATURE_SAI_FIFO_COUNT) && (FSL_FEATURE_SAI_FIFO_COUNT > 1) |
| handle->count = FSL_FEATURE_SAI_FIFO_COUNT - format->watermark; |
| #else |
| handle->count = 1U; |
| #endif /* FSL_FEATURE_SAI_FIFO_COUNT */ |
| } |
| |
| /*! |
| * brief Configures the SAI Rx audio format. |
| * |
| * The audio format can be changed at run-time. This function configures the sample rate and audio data |
| * format to be transferred. This function also sets the eDMA parameter according to formatting requirements. |
| * |
| * param base SAI base pointer. |
| * param handle SAI eDMA handle pointer. |
| * param format Pointer to SAI audio data format structure. |
| * param mclkSourceClockHz SAI master clock source frequency in Hz. |
| * param bclkSourceClockHz SAI bit clock source frequency in Hz. If a bit clock source is the master |
| * clock, this value should equal to masterClockHz in format. |
| * retval kStatus_Success Audio format set successfully. |
| * retval kStatus_InvalidArgument The input argument is invalid. |
| */ |
| void SAI_TransferRxSetFormatEDMA(I2S_Type *base, |
| sai_edma_handle_t *handle, |
| sai_transfer_format_t *format, |
| uint32_t mclkSourceClockHz, |
| uint32_t bclkSourceClockHz) |
| { |
| assert(handle && format); |
| |
| /* Configure the audio format to SAI registers */ |
| SAI_RxSetFormat(base, format, mclkSourceClockHz, bclkSourceClockHz); |
| |
| /* Get the tranfer size from format, this should be used in EDMA configuration */ |
| if (format->bitWidth == 24U) |
| { |
| handle->bytesPerFrame = 4U; |
| } |
| else |
| { |
| handle->bytesPerFrame = format->bitWidth / 8U; |
| } |
| |
| /* Update the data channel SAI used */ |
| handle->channel = format->channel; |
| |
| /* Clear the channel enable bits unitl do a send/receive */ |
| base->RCR3 &= ~I2S_RCR3_RCE_MASK; |
| #if defined(FSL_FEATURE_SAI_FIFO_COUNT) && (FSL_FEATURE_SAI_FIFO_COUNT > 1) |
| handle->count = format->watermark; |
| #else |
| handle->count = 1U; |
| #endif /* FSL_FEATURE_SAI_FIFO_COUNT */ |
| } |
| |
| /*! |
| * brief Performs a non-blocking SAI transfer using DMA. |
| * |
| * note This interface returns immediately after the transfer initiates. Call |
| * SAI_GetTransferStatus to poll the transfer status and check whether the SAI transfer is finished. |
| * |
| * param base SAI base pointer. |
| * param handle SAI eDMA handle pointer. |
| * param xfer Pointer to the DMA transfer structure. |
| * retval kStatus_Success Start a SAI eDMA send successfully. |
| * retval kStatus_InvalidArgument The input argument is invalid. |
| * retval kStatus_TxBusy SAI is busy sending data. |
| */ |
| status_t SAI_TransferSendEDMA(I2S_Type *base, sai_edma_handle_t *handle, sai_transfer_t *xfer) |
| { |
| assert(handle && xfer); |
| |
| edma_transfer_config_t config = {0}; |
| uint32_t destAddr = SAI_TxGetDataRegisterAddress(base, handle->channel); |
| |
| /* Check if input parameter invalid */ |
| if ((xfer->data == NULL) || (xfer->dataSize == 0U)) |
| { |
| return kStatus_InvalidArgument; |
| } |
| |
| if (handle->saiQueue[handle->queueUser].data) |
| { |
| return kStatus_SAI_QueueFull; |
| } |
| |
| /* Change the state of handle */ |
| handle->state = kSAI_Busy; |
| |
| /* Update the queue state */ |
| handle->transferSize[handle->queueUser] = xfer->dataSize; |
| handle->saiQueue[handle->queueUser].data = xfer->data; |
| handle->saiQueue[handle->queueUser].dataSize = xfer->dataSize; |
| handle->queueUser = (handle->queueUser + 1) % SAI_XFER_QUEUE_SIZE; |
| |
| /* Prepare edma configure */ |
| EDMA_PrepareTransfer(&config, xfer->data, handle->bytesPerFrame, (void *)destAddr, handle->bytesPerFrame, |
| handle->count * handle->bytesPerFrame, xfer->dataSize, kEDMA_MemoryToPeripheral); |
| |
| /* Store the initially configured eDMA minor byte transfer count into the SAI handle */ |
| handle->nbytes = handle->count * handle->bytesPerFrame; |
| |
| EDMA_SubmitTransfer(handle->dmaHandle, &config); |
| |
| /* Start DMA transfer */ |
| EDMA_StartTransfer(handle->dmaHandle); |
| |
| /* Enable DMA enable bit */ |
| SAI_TxEnableDMA(base, kSAI_FIFORequestDMAEnable, true); |
| |
| /* Enable SAI Tx clock */ |
| SAI_TxEnable(base, true); |
| |
| /* Enable the channel FIFO */ |
| base->TCR3 |= I2S_TCR3_TCE(1U << handle->channel); |
| |
| return kStatus_Success; |
| } |
| |
| /*! |
| * brief Performs a non-blocking SAI receive using eDMA. |
| * |
| * note This interface returns immediately after the transfer initiates. Call |
| * the SAI_GetReceiveRemainingBytes to poll the transfer status and check whether the SAI transfer is finished. |
| * |
| * param base SAI base pointer |
| * param handle SAI eDMA handle pointer. |
| * param xfer Pointer to DMA transfer structure. |
| * retval kStatus_Success Start a SAI eDMA receive successfully. |
| * retval kStatus_InvalidArgument The input argument is invalid. |
| * retval kStatus_RxBusy SAI is busy receiving data. |
| */ |
| status_t SAI_TransferReceiveEDMA(I2S_Type *base, sai_edma_handle_t *handle, sai_transfer_t *xfer) |
| { |
| assert(handle && xfer); |
| |
| edma_transfer_config_t config = {0}; |
| uint32_t srcAddr = SAI_RxGetDataRegisterAddress(base, handle->channel); |
| |
| /* Check if input parameter invalid */ |
| if ((xfer->data == NULL) || (xfer->dataSize == 0U)) |
| { |
| return kStatus_InvalidArgument; |
| } |
| |
| if (handle->saiQueue[handle->queueUser].data) |
| { |
| return kStatus_SAI_QueueFull; |
| } |
| |
| /* Change the state of handle */ |
| handle->state = kSAI_Busy; |
| |
| /* Update queue state */ |
| handle->transferSize[handle->queueUser] = xfer->dataSize; |
| handle->saiQueue[handle->queueUser].data = xfer->data; |
| handle->saiQueue[handle->queueUser].dataSize = xfer->dataSize; |
| handle->queueUser = (handle->queueUser + 1) % SAI_XFER_QUEUE_SIZE; |
| |
| /* Prepare edma configure */ |
| EDMA_PrepareTransfer(&config, (void *)srcAddr, handle->bytesPerFrame, xfer->data, handle->bytesPerFrame, |
| handle->count * handle->bytesPerFrame, xfer->dataSize, kEDMA_PeripheralToMemory); |
| |
| /* Store the initially configured eDMA minor byte transfer count into the SAI handle */ |
| handle->nbytes = handle->count * handle->bytesPerFrame; |
| |
| EDMA_SubmitTransfer(handle->dmaHandle, &config); |
| |
| /* Start DMA transfer */ |
| EDMA_StartTransfer(handle->dmaHandle); |
| |
| /* Enable DMA enable bit */ |
| SAI_RxEnableDMA(base, kSAI_FIFORequestDMAEnable, true); |
| |
| /* Enable the channel FIFO */ |
| base->RCR3 |= I2S_RCR3_RCE(1U << handle->channel); |
| |
| /* Enable SAI Rx clock */ |
| SAI_RxEnable(base, true); |
| |
| return kStatus_Success; |
| } |
| |
| /*! |
| * brief Aborts a SAI transfer using eDMA. |
| * |
| * This function only aborts the current transfer slots, the other transfer slots' information still kept |
| * in the handler. If users want to terminate all transfer slots, just call SAI_TransferTerminateSendEDMA. |
| * |
| * param base SAI base pointer. |
| * param handle SAI eDMA handle pointer. |
| */ |
| void SAI_TransferAbortSendEDMA(I2S_Type *base, sai_edma_handle_t *handle) |
| { |
| assert(handle); |
| |
| /* Disable dma */ |
| EDMA_AbortTransfer(handle->dmaHandle); |
| |
| /* Disable the channel FIFO */ |
| base->TCR3 &= ~I2S_TCR3_TCE_MASK; |
| |
| /* Disable DMA enable bit */ |
| SAI_TxEnableDMA(base, kSAI_FIFORequestDMAEnable, false); |
| |
| /* Disable Tx */ |
| SAI_TxEnable(base, false); |
| |
| /* Reset the FIFO pointer, at the same time clear all error flags if set */ |
| base->TCSR |= (I2S_TCSR_FR_MASK | I2S_TCSR_SR_MASK); |
| base->TCSR &= ~I2S_TCSR_SR_MASK; |
| |
| /* Handle the queue index */ |
| memset(&handle->saiQueue[handle->queueDriver], 0, sizeof(sai_transfer_t)); |
| handle->queueDriver = (handle->queueDriver + 1) % SAI_XFER_QUEUE_SIZE; |
| |
| /* Set the handle state */ |
| handle->state = kSAI_Idle; |
| } |
| |
| /*! |
| * brief Aborts a SAI receive using eDMA. |
| * |
| * This function only aborts the current transfer slots, the other transfer slots' information still kept |
| * in the handler. If users want to terminate all transfer slots, just call SAI_TransferTerminateReceiveEDMA. |
| * |
| * param base SAI base pointer |
| * param handle SAI eDMA handle pointer. |
| */ |
| void SAI_TransferAbortReceiveEDMA(I2S_Type *base, sai_edma_handle_t *handle) |
| { |
| assert(handle); |
| |
| /* Disable dma */ |
| EDMA_AbortTransfer(handle->dmaHandle); |
| |
| /* Disable the channel FIFO */ |
| base->RCR3 &= ~I2S_RCR3_RCE_MASK; |
| |
| /* Disable DMA enable bit */ |
| SAI_RxEnableDMA(base, kSAI_FIFORequestDMAEnable, false); |
| |
| /* Disable Rx */ |
| SAI_RxEnable(base, false); |
| |
| /* Reset the FIFO pointer, at the same time clear all error flags if set */ |
| base->RCSR |= (I2S_RCSR_FR_MASK | I2S_RCSR_SR_MASK); |
| base->RCSR &= ~I2S_RCSR_SR_MASK; |
| |
| /* Handle the queue index */ |
| memset(&handle->saiQueue[handle->queueDriver], 0, sizeof(sai_transfer_t)); |
| handle->queueDriver = (handle->queueDriver + 1) % SAI_XFER_QUEUE_SIZE; |
| |
| /* Set the handle state */ |
| handle->state = kSAI_Idle; |
| } |
| |
| /*! |
| * brief Terminate all SAI send. |
| * |
| * This function will clear all transfer slots buffered in the sai queue. If users only want to abort the |
| * current transfer slot, please call SAI_TransferAbortSendEDMA. |
| * |
| * param base SAI base pointer. |
| * param handle SAI eDMA handle pointer. |
| */ |
| void SAI_TransferTerminateSendEDMA(I2S_Type *base, sai_edma_handle_t *handle) |
| { |
| assert(handle); |
| |
| /* Abort the current transfer */ |
| SAI_TransferAbortSendEDMA(base, handle); |
| |
| /* Clear all the internal information */ |
| memset(handle->tcd, 0U, sizeof(handle->tcd)); |
| memset(handle->saiQueue, 0U, sizeof(handle->saiQueue)); |
| memset(handle->transferSize, 0U, sizeof(handle->transferSize)); |
| handle->queueUser = 0U; |
| handle->queueDriver = 0U; |
| } |
| |
| /*! |
| * brief Terminate all SAI receive. |
| * |
| * This function will clear all transfer slots buffered in the sai queue. If users only want to abort the |
| * current transfer slot, please call SAI_TransferAbortReceiveEDMA. |
| * |
| * param base SAI base pointer. |
| * param handle SAI eDMA handle pointer. |
| */ |
| void SAI_TransferTerminateReceiveEDMA(I2S_Type *base, sai_edma_handle_t *handle) |
| { |
| assert(handle); |
| |
| /* Abort the current transfer */ |
| SAI_TransferAbortReceiveEDMA(base, handle); |
| |
| /* Clear all the internal information */ |
| memset(handle->tcd, 0U, sizeof(handle->tcd)); |
| memset(handle->saiQueue, 0U, sizeof(handle->saiQueue)); |
| memset(handle->transferSize, 0U, sizeof(handle->transferSize)); |
| handle->queueUser = 0U; |
| handle->queueDriver = 0U; |
| } |
| |
| /*! |
| * brief Gets byte count sent by SAI. |
| * |
| * param base SAI base pointer. |
| * param handle SAI eDMA handle pointer. |
| * param count Bytes count sent by SAI. |
| * retval kStatus_Success Succeed get the transfer count. |
| * retval kStatus_NoTransferInProgress There is no non-blocking transaction in progress. |
| */ |
| status_t SAI_TransferGetSendCountEDMA(I2S_Type *base, sai_edma_handle_t *handle, size_t *count) |
| { |
| assert(handle); |
| |
| status_t status = kStatus_Success; |
| |
| if (handle->state != kSAI_Busy) |
| { |
| status = kStatus_NoTransferInProgress; |
| } |
| else |
| { |
| *count = (handle->transferSize[handle->queueDriver] - |
| (uint32_t)handle->nbytes * |
| EDMA_GetRemainingMajorLoopCount(handle->dmaHandle->base, handle->dmaHandle->channel)); |
| } |
| |
| return status; |
| } |
| |
| /*! |
| * brief Gets byte count received by SAI. |
| * |
| * param base SAI base pointer |
| * param handle SAI eDMA handle pointer. |
| * param count Bytes count received by SAI. |
| * retval kStatus_Success Succeed get the transfer count. |
| * retval kStatus_NoTransferInProgress There is no non-blocking transaction in progress. |
| */ |
| status_t SAI_TransferGetReceiveCountEDMA(I2S_Type *base, sai_edma_handle_t *handle, size_t *count) |
| { |
| assert(handle); |
| |
| status_t status = kStatus_Success; |
| |
| if (handle->state != kSAI_Busy) |
| { |
| status = kStatus_NoTransferInProgress; |
| } |
| else |
| { |
| *count = (handle->transferSize[handle->queueDriver] - |
| (uint32_t)handle->nbytes * |
| EDMA_GetRemainingMajorLoopCount(handle->dmaHandle->base, handle->dmaHandle->channel)); |
| } |
| |
| return status; |
| } |