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lpuart_edma_transfer.c
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lpuart_edma_transfer.c
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/*
* Copyright (c) 2015, Freescale Semiconductor, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* o Redistributions of source code must retain the above copyright notice, this list
* of conditions and the following disclaimer.
*
* o Redistributions in binary form must reproduce the above copyright notice, this
* list of conditions and the following disclaimer in the documentation and/or
* other materials provided with the distribution.
*
* o Neither the name of Freescale Semiconductor, Inc. nor the names of its
* contributors may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "board.h"
#include "fsl_lpuart_edma.h"
#include "fsl_dma_manager.h"
#include "pin_mux.h"
#include "clock_config.h"
/*******************************************************************************
* Definitions
******************************************************************************/
#define DEMO_LPUART LPUART0
#define DEMO_LPUART_CLKSRC kCLOCK_PllFllSelClk
#define LPUART_TX_DMA_CHANNEL 0U
#define LPUART_RX_DMA_CHANNEL 1U
#define LPUART_TX_DMA_REQUEST kDmaRequestMux0LPUART0Tx
#define LPUART_RX_DMA_REQUEST kDmaRequestMux0LPUART0Rx
#define ECHO_BUFFER_LENGTH 8
/*******************************************************************************
* Prototypes
******************************************************************************/
/* LPUART user callback */
void LPUART_UserCallback(LPUART_Type *base, lpuart_edma_handle_t *handle, status_t status, void *userData);
/*******************************************************************************
* Variables
******************************************************************************/
lpuart_edma_handle_t g_lpuartEdmaHandle;
edma_handle_t g_lpuartTxEdmaHandle;
edma_handle_t g_lpuartRxEdmaHandle;
uint8_t g_tipString[] = "LPUART EDMA example\r\nSend back received data\r\nEcho every 8 characters\r\n";
uint8_t g_txBuffer[ECHO_BUFFER_LENGTH] = {0};
uint8_t g_rxBuffer[ECHO_BUFFER_LENGTH] = {0};
volatile bool rxBufferEmpty = true;
volatile bool txBufferFull = false;
volatile bool txOnGoing = false;
volatile bool rxOnGoing = false;
/*******************************************************************************
* Code
******************************************************************************/
/* LPUART user callback */
void LPUART_UserCallback(LPUART_Type *base, lpuart_edma_handle_t *handle, status_t status, void *userData)
{
userData = userData;
if (kStatus_LPUART_TxIdle == status)
{
txBufferFull = false;
txOnGoing = false;
}
if (kStatus_LPUART_RxIdle == status)
{
rxBufferEmpty = false;
rxOnGoing = false;
}
}
/*!
* @brief Main function
*/
int main(void)
{
lpuart_config_t lpuartConfig;
lpuart_transfer_t xfer;
lpuart_transfer_t sendXfer;
lpuart_transfer_t receiveXfer;
BOARD_InitPins();
BOARD_BootClockRUN();
CLOCK_SetLpuartClock(1U);
/* Initialize the LPUART. */
/*
* lpuartConfig.baudRate_Bps = 115200U;
* lpuartConfig.parityMode = kLPUART_ParityDisabled;
* lpuartConfig.stopBitCount = kLPUART_OneStopBit;
* lpuartConfig.txFifoWatermark = 0;
* lpuartConfig.rxFifoWatermark = 0;
* lpuartConfig.enableTx = false;
* lpuartConfig.enableRx = false;
*/
LPUART_GetDefaultConfig(&lpuartConfig);
lpuartConfig.baudRate_Bps = BOARD_DEBUG_UART_BAUDRATE;
lpuartConfig.enableTx = true;
lpuartConfig.enableRx = true;
LPUART_Init(DEMO_LPUART, &lpuartConfig, CLOCK_GetFreq(DEMO_LPUART_CLKSRC));
/* Configure DMA. */
DMAMGR_Init();
/* Request dma channels from DMA manager. */
DMAMGR_RequestChannel(LPUART_TX_DMA_REQUEST, LPUART_TX_DMA_CHANNEL, &g_lpuartTxEdmaHandle);
DMAMGR_RequestChannel(LPUART_RX_DMA_REQUEST, LPUART_RX_DMA_CHANNEL, &g_lpuartRxEdmaHandle);
/* Create LPUART DMA handle. */
LPUART_TransferCreateHandleEDMA(DEMO_LPUART, &g_lpuartEdmaHandle, LPUART_UserCallback, NULL, &g_lpuartTxEdmaHandle,
&g_lpuartRxEdmaHandle);
/* Send g_tipString out. */
xfer.data = g_tipString;
xfer.dataSize = sizeof(g_tipString) - 1;
txOnGoing = true;
LPUART_SendEDMA(DEMO_LPUART, &g_lpuartEdmaHandle, &xfer);
/* Wait send finished */
while (txOnGoing)
{
}
/* Start to echo. */
sendXfer.data = g_txBuffer;
sendXfer.dataSize = ECHO_BUFFER_LENGTH;
receiveXfer.data = g_rxBuffer;
receiveXfer.dataSize = ECHO_BUFFER_LENGTH;
while (1)
{
/* If RX is idle and g_rxBuffer is empty, start to read data to g_rxBuffer. */
if ((!rxOnGoing) && rxBufferEmpty)
{
rxOnGoing = true;
LPUART_ReceiveEDMA(DEMO_LPUART, &g_lpuartEdmaHandle, &receiveXfer);
}
/* If TX is idle and g_txBuffer is full, start to send data. */
if ((!txOnGoing) && txBufferFull)
{
txOnGoing = true;
LPUART_SendEDMA(DEMO_LPUART, &g_lpuartEdmaHandle, &sendXfer);
}
/* If g_txBuffer is empty and g_rxBuffer is full, copy g_rxBuffer to g_txBuffer. */
if ((!rxBufferEmpty) && (!txBufferFull))
{
memcpy(g_txBuffer, g_rxBuffer, ECHO_BUFFER_LENGTH);
rxBufferEmpty = true;
txBufferFull = true;
}
}
}