luatos-soc-air105/bsp/air105/hal/core_uart.c

/*
 * Copyright (c) 2022 OpenLuat & AirM2M
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the "Software"), to deal in
 * the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
 * the Software, and to permit persons to whom the Software is furnished to do so,
 * subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

#include "user.h"

//const UART_TypeDef* hwUart[UART_MAX] = {UART0, UART1, UART2, UART3};
//const int IrqUart[UART_MAX] = {UART0_IRQn, UART1_IRQn, UART2_IRQn, UART3_IRQn};
//static CBFuncEx_t UartCB[UART_MAX];
//static Buffer_Struct prvUartTxBuffer[UART_MAX];
#define RX_BUF_LOW	(1024)
#define RX_BUF_INIT	(2048)
#define RX_BUF_HIGH	(8192)
#define RX_BUF_BAND (3)
#define TX_BUF_INIT	(2048)
//#define __RX_USE_DMA__

typedef struct
{
	const UART_TypeDef *RegBase;
	const int IrqLine;
	const uint16_t DMATxChannel;
	const uint16_t DMARxChannel;
	CBFuncEx_t Callback;
	Buffer_Struct TxBuf;
#ifdef __BUILD_OS__
	Buffer_Struct TxCacheBuf;	// 缓存下次发送的数据
#endif
	Buffer_Struct RxBuf;
#ifdef __RX_USE_DMA__
	Buffer_Struct RxDMABuf[RX_BUF_BAND];
#endif
	uint32_t LastError;
#ifdef __RX_USE_DMA__
	uint8_t RxDMASn;

#endif
	uint8_t RxCacheMode;
	uint8_t DMATxStream;
	uint8_t DMARxStream;
//	uint8_t IsHighSpeed;
}Uart_ResourceStruct;

static Uart_ResourceStruct prvUart[UART_MAX] = {
		{
				UART0,
				UART0_IRQn,
				SYSCTRL_PHER_CTRL_DMA_CHx_IF_UART0_TX,
				SYSCTRL_PHER_CTRL_DMA_CHx_IF_UART0_RX,
		},
		{
				UART1,
				UART1_IRQn,
				SYSCTRL_PHER_CTRL_DMA_CHx_IF_UART1_TX,
				SYSCTRL_PHER_CTRL_DMA_CHx_IF_UART1_RX,
		},
		{
				UART2,
				UART2_IRQn,
				SYSCTRL_PHER_CTRL_DMA_CHx_IF_UART2_TX,
				SYSCTRL_PHER_CTRL_DMA_CHx_IF_UART2_RX,
		},
		{
				UART3,
				UART3_IRQn,
				SYSCTRL_PHER_CTRL_DMA_CHx_IF_UART3_TX,
				SYSCTRL_PHER_CTRL_DMA_CHx_IF_UART3_RX,
		},
};

static int32_t prvUart_DummyCB(void *pData, void *pParam)
{
	return 0;
}
static void prvUart_IrqHandle(int32_t IrqLine, void *pData);

static void prvUart_RxDMADone(uint8_t UartID)
{
#ifdef __BUILD_OS__
#ifdef __RX_USE_DMA__
	uint32_t Length, LastRxSn;
	LastRxSn = prvUart[UartID].RxDMASn;
	DMA_StopStream(prvUart[UartID].DMARxStream);
	Length = DMA_GetDataLength(prvUart[UartID].DMARxStream, &prvUart[UartID].RxDMABuf[LastRxSn].Data);
	Length += Uart_FifoRead(UartID, &prvUart[UartID].RxDMABuf[LastRxSn].Data[Length]);
	prvUart[UartID].RxDMASn = (prvUart[UartID].RxDMASn + 1)%RX_BUF_BAND;
	Uart_DMARx(UartID, prvUart[UartID].DMARxStream, prvUart[UartID].RxDMABuf[prvUart[UartID].RxDMASn].Data, RX_BUF_LOW);
	if ((prvUart[UartID].RxBuf.Pos + Length) < prvUart[UartID].RxBuf.MaxLen)
	{

	}
	else
	{
		OS_ReSizeBuffer(&prvUart[UartID].RxBuf, prvUart[UartID].RxBuf.MaxLen * 2);
	}
	OS_BufferWrite(&prvUart[UartID].RxBuf, prvUart[UartID].RxDMABuf[LastRxSn].Data, Length);
#endif
#endif
}
static int32_t prvUart_DMAIrqCB(void *pData, void *pParam)
{
	uint8_t UartID = (uint32_t)pData;

	UART_TypeDef* Uart = (UART_TypeDef*)prvUart[UartID].RegBase;
	if (prvUart[UartID].RxCacheMode)
	{
		prvUart_RxDMADone(UartID);
	}
	else
	{
		prvUart[UartID].Callback(pData, pParam);
	}
}

static void prvUart_FIFOInit(UART_TypeDef *UARTx, UART_FIFOInitTypeDef *UART_FIFOInitStruct)
{
	/**************************  FIFO Tx Interrupt Config ******************************/
	if (DISABLE != UART_FIFOInitStruct->FIFO_TX_TriggerIntEnable)
	{
		UARTx->OFFSET_4.IER |= UART_IER_PTIME;
	}
	else
	{
		UARTx->OFFSET_4.IER &= ~UART_IER_PTIME;
	}

	/**************************  FIFO Config ******************************/
	/* FCR Write Only So Here we Use FCR Shadow Register SDMAM(WR) */
	if (UARTx->SFE | UART_SFE_SFE)
	{
		UARTx->SFE &= ~UART_SFE_SFE;
	}

	if (UART_FIFO_DMA_Mode_0 == UART_FIFOInitStruct->FIFO_DMA_Mode)
	{
		UARTx->SDMAM &= ~UART_SDMAM_SDMAM;
	}
	else if(UART_FIFO_DMA_Mode_1 == UART_FIFOInitStruct->FIFO_DMA_Mode)
	{
		UARTx->SDMAM |= UART_SDMAM_SDMAM;
	}

	/* FCR Write Only So Here we Use FCR Shadow Register SRT and STET(WR) */
	UARTx->SRT = UART_FIFOInitStruct->FIFO_RX_Trigger;
	UARTx->STET = UART_FIFOInitStruct->FIFO_TX_Trigger;

	if (DISABLE != UART_FIFOInitStruct->FIFO_Enable)
	{
		UARTx->SFE |= UART_SFE_SFE;
	}
	else
	{
		UARTx->SFE &= ~UART_SFE_SFE;
	}
}


void Uart_GlobalInit(void)
{
	int i, j;
	for(i = 0; i < UART_MAX; i++)
	{
		memset(&prvUart[i].RxBuf, 0, sizeof(Buffer_Struct));
#ifdef __RX_USE_DMA__
		for(j = 0; j < RX_BUF_BAND; j++)
		{
			memset(&prvUart[i].RxDMABuf[j], 0, sizeof(Buffer_Struct));
		}
#endif
		prvUart[i].RxCacheMode = 0;
	}
}

void Uart_BaseInit(uint8_t UartID, uint32_t BaudRate, uint8_t IsRxCacheEnable, uint8_t DataBits, uint8_t Parity, uint8_t StopBits, CBFuncEx_t CB)
{
	uint32_t tmpBaudRateDiv, LCR;
	UART_FIFOInitTypeDef UART_FIFOInitStruct;
	UART_TypeDef* Uart = prvUart[UartID].RegBase;
	SYSCTRL->SOFT_RST1 = (1 << UartID);
	while(SYSCTRL->SOFT_RST1 & (1 << UartID)){;}
    UART_FIFOInitStruct.FIFO_Enable = ENABLE;
    UART_FIFOInitStruct.FIFO_DMA_Mode = UART_FIFO_DMA_Mode_1;
    UART_FIFOInitStruct.FIFO_RX_Trigger = UART_FIFO_RX_Trigger_1_2_Full;
    UART_FIFOInitStruct.FIFO_TX_Trigger = UART_FIFO_TX_Trigger_1_4_Full;
    UART_FIFOInitStruct.FIFO_TX_TriggerIntEnable = ENABLE;

    ISR_SetHandler(prvUart[UartID].IrqLine, prvUart_IrqHandle, (void *)UartID);
#ifdef __BUILD_OS__
	ISR_SetPriority(prvUart[UartID].IrqLine, IRQ_MAX_PRIORITY + 2);
#else
	ISR_SetPriority(prvUart[UartID].IrqLine, 5);
#endif
	if (CB)
	{
		prvUart[UartID].Callback = CB;
	}
	else
	{
		prvUart[UartID].Callback = prvUart_DummyCB;
	}
//	UART_Init(Uart, &UART_InitStruct);
	Uart->LCR |= UART_LCR_DLAB;

	// baud rate = (serial clock freq) / (16 * divisor).
	tmpBaudRateDiv = (SystemCoreClock >> 6) / BaudRate;
	Uart->OFFSET_0.DLL = (tmpBaudRateDiv & 0x00FF);
	Uart->OFFSET_4.DLH = ((tmpBaudRateDiv >> 8) & 0x00FF);

	/* LCR = 0 */
	Uart->LCR &= ~UART_LCR_DLAB;
	LCR = UART_WordLength_5b + DataBits - UART_DATA_BIT5;
	switch(StopBits)
	{
	case UART_STOP_BIT1:
		LCR |= UART_StopBits_1;
		break;
	case UART_STOP_BIT1_5:
		LCR |= UART_StopBits_1_5;
		break;
	case UART_STOP_BIT2:
		LCR |= UART_StopBits_2;
		break;
	}
	switch(Parity)
	{
	case UART_PARITY_NONE:
		LCR |= UART_Parity_No;
		break;
	case UART_PARITY_ODD:
		LCR |= UART_Parity_Odd;
		break;
	case UART_PARITY_EVEN:
		LCR |= UART_Parity_Even;
		break;
	}
	Uart->LCR = LCR;
    prvUart_FIFOInit(Uart, &UART_FIFOInitStruct);
    ISR_OnOff(prvUart[UartID].IrqLine, 0);
    Uart->SFE |= UART_SFE_SFE;
    Uart->OFFSET_4.IER = UART_IER_ELSI;
    prvUart[UartID].RxCacheMode = IsRxCacheEnable;
#ifdef __BUILD_OS__
    if (IsRxCacheEnable)
    {
    	if (BaudRate >= 1000000)
    	{
    		OS_ReInitBuffer(&prvUart[UartID].RxBuf, RX_BUF_HIGH);
    	}
    	else
    	{
    		OS_ReInitBuffer(&prvUart[UartID].RxBuf, RX_BUF_INIT);
    	}

#ifdef __RX_USE_DMA__
    	for(i = 0; i < RX_BUF_BAND; i++)
    	{
    		OS_ReInitBuffer(&prvUart[UartID].RxDMABuf[i], RX_BUF_LOW + 32);
    	}

    	Uart_DMARxInit(UartID, UART_ID0_RX_DMA_STREAM + UartID, 0);
    	Uart_DMARx(UartID, UART_ID0_RX_DMA_STREAM + UartID, prvUart[UartID].RxDMABuf[prvUart[UartID].RxDMASn].Data, RX_BUF_LOW);
#endif
    }
    else
    {
    	OS_DeInitBuffer(&prvUart[UartID].RxBuf);
    	OS_ReInitBuffer(&prvUart[UartID].TxCacheBuf, TX_BUF_INIT);
    	OS_DeInitBuffer(&prvUart[UartID].TxBuf);
#ifdef __RX_USE_DMA__
    	for(i = 0; i < RX_BUF_BAND; i++)
    	{
    		OS_DeInitBuffer(&prvUart[UartID].RxDMABuf[i]);
    	}
#endif
    }
#endif
    if (UartID != DBG_UART_ID)
    {
    	PM_SetHardwareRunFlag(PM_HW_UART_0 + UartID, 1);
    }
}


void Uart_SetCb(uint8_t UartID, CBFuncEx_t CB)
{
	if (CB)
	{
		prvUart[UartID].Callback = CB;
	}
	else
	{
		prvUart[UartID].Callback = prvUart_DummyCB;
	}
}

void Uart_DeInit(uint8_t UartID)
{
	UART_TypeDef* Uart = (UART_TypeDef*)prvUart[UartID].RegBase;
	Uart->OFFSET_4.IER = 0;
	Uart_BufferTxStop(UartID);
	ISR_OnOff(prvUart[UartID].IrqLine, 0);
	ISR_Clear(prvUart[UartID].IrqLine);
	/* LCR = 1 */
	Uart->LCR |= UART_LCR_DLAB;
	Uart->OFFSET_0.DLL = 0;
	Uart->OFFSET_4.DLH = 0;

	/* LCR = 0 */
	Uart->LCR &= ~UART_LCR_DLAB;
	if (UartID != DBG_UART_ID)
    {
    	PM_SetHardwareRunFlag(PM_HW_UART_0 + UartID, 0);
    }
#ifdef __BUILD_OS__
	OS_DeInitBuffer(&prvUart[UartID].TxBuf);
	OS_DeInitBuffer(&prvUart[UartID].TxCacheBuf);
	OS_DeInitBuffer(&prvUart[UartID].RxBuf);
#endif
}

int Uart_DMATxInit(uint8_t UartID, uint8_t Stream, uint32_t Channel)
{
	DMA_InitTypeDef DMA_InitStruct;
	UART_TypeDef* Uart = (UART_TypeDef*)prvUart[UartID].RegBase;
	DMA_BaseConfig(&DMA_InitStruct);
	DMA_InitStruct.DMA_Peripheral = prvUart[UartID].DMATxChannel;
	DMA_InitStruct.DMA_PeripheralBurstSize = DMA_BurstSize_8;
	DMA_InitStruct.DMA_PeripheralBaseAddr = (uint32_t)&Uart->OFFSET_0.THR;
	DMA_InitStruct.DMA_Priority = DMA_Priority_1;
	DMA_InitStruct.DMA_MemoryBurstSize = DMA_BurstSize_8;
	prvUart[UartID].DMATxStream = Stream;
	return DMA_ConfigStream(Stream, &DMA_InitStruct);
}

int Uart_DMARxInit(uint8_t UartID, uint8_t Stream, uint32_t Channel)
{
	DMA_InitTypeDef DMA_InitStruct;
	UART_TypeDef* Uart = (UART_TypeDef*)prvUart[UartID].RegBase;
	DMA_BaseConfig(&DMA_InitStruct);
	DMA_InitStruct.DMA_Peripheral = prvUart[UartID].DMARxChannel;
	DMA_InitStruct.DMA_PeripheralBaseAddr = (uint32_t)&Uart->OFFSET_0.RBR;
	DMA_InitStruct.DMA_Priority = DMA_Priority_3;
	prvUart[UartID].DMARxStream = Stream;
	return DMA_ConfigStream(Stream, &DMA_InitStruct);
}

void Uart_BlockTx(uint8_t UartID, uint8_t *Data, uint32_t Len)
{
	uint32_t i = 0;
	UART_TypeDef* Uart = (UART_TypeDef*)prvUart[UartID].RegBase;
    Uart->OFFSET_4.IER &= ~(UART_IER_PTIME|UART_IER_ETBEI);
	while(i < Len)
	{
		while (Uart->USR & UART_STATUS_TX_FIFO_NOT_FULL)
		{
			Uart->OFFSET_0.THR = Data[i];
			i++;
		}
	}
}

void Uart_NoBlockTx(uint8_t UartID, uint8_t Data)
{
	uint32_t i = 0;
	UART_TypeDef* Uart = (UART_TypeDef*)prvUart[UartID].RegBase;
	while (!(Uart->USR & UART_STATUS_TX_FIFO_NOT_FULL))
	{

	}
	Uart->OFFSET_0.THR = Data;
}

void Uart_EnableRxIrq(uint8_t UartID)
{
	UART_TypeDef* Uart = (UART_TypeDef*)prvUart[UartID].RegBase;
	Uart->SRT = UART_FIFO_RX_Trigger_1_2_Full;
	Uart->OFFSET_4.IER |= UART_IT_RX_RECVD|UART_IER_ELSI;
	ISR_OnOff(prvUart[UartID].IrqLine, 1);
}

void Uart_EnableTxDoneIrq(uint8_t UartID)
{


}

void Uart_DMATx(uint8_t UartID, uint8_t Stream, const uint8_t *Data, uint32_t Len)
{
	UART_TypeDef* Uart = (UART_TypeDef*)prvUart[UartID].RegBase;
	Uart->OFFSET_4.IER &= ~(UART_IER_PTIME|UART_IER_ETBEI);
	DMA_ClearStreamFlag(Stream);
	DMA_ForceStartStream(Stream, Data, Len, prvUart_DMAIrqCB, (uint32_t)UartID, 1);
	Uart->OFFSET_4.IER |= UART_IER_PTIME|UART_IER_ETBEI;
    ISR_OnOff(prvUart[UartID].IrqLine, 1);
}

void Uart_DMARx(uint8_t UartID, uint8_t Stream, uint8_t *Data, uint32_t Len)
{
	UART_TypeDef* Uart = (UART_TypeDef*)prvUart[UartID].RegBase;
	Uart->OFFSET_4.IER |= UART_IT_RX_RECVD;
	Uart->SRT = UART_FIFO_RX_Trigger_1_4_Full;
	ISR_OnOff(prvUart[UartID].IrqLine, 1);
	DMA_ClearStreamFlag(Stream);
	DMA_ForceStartStream(Stream, Data, Len, prvUart_DMAIrqCB, (uint32_t)UartID, 1);
}

uint8_t Uart_IsTSREmpty(uint8_t UartID)
{
	UART_TypeDef* Uart = (UART_TypeDef*)prvUart[UartID].RegBase;
	return (Uart->LSR & UART_LSR_TEMT);
}

int32_t Uart_BufferTx(uint8_t UartID, const uint8_t *Data, uint32_t Len)
{
	UART_TypeDef* Uart = (UART_TypeDef*)prvUart[UartID].RegBase;
	ISR_OnOff(prvUart[UartID].IrqLine, 0);
#ifdef __BUILD_OS__
	if (Data && Len)
	{
		OS_BufferWrite(&prvUart[UartID].TxCacheBuf, Data, Len);
	}
#endif
	if (prvUart[UartID].TxBuf.Data || prvUart[UartID].TxBuf.MaxLen)
	{
		ISR_OnOff(prvUart[UartID].IrqLine, 1);
		return 0;
	}
	Uart->OFFSET_4.IER &= ~(UART_IER_PTIME|UART_IER_ETBEI);
#ifdef __BUILD_OS__
	// 把缓存的Tx指针交给发送的Tx指针，缓存的Tx指针重新建立一个
	Buffer_StaticInit(&prvUart[UartID].TxBuf, prvUart[UartID].TxCacheBuf.Data, prvUart[UartID].TxCacheBuf.Pos);
#else
	Buffer_StaticInit(&prvUart[UartID].TxBuf, Data, Len);
#endif
	while ((prvUart[UartID].TxBuf.Pos < prvUart[UartID].TxBuf.MaxLen) && (Uart->USR & UART_STATUS_TX_FIFO_NOT_FULL))
	{
		Uart->OFFSET_0.THR = prvUart[UartID].TxBuf.Data[prvUart[UartID].TxBuf.Pos];
		prvUart[UartID].TxBuf.Pos++;
	}
	if (prvUart[UartID].TxBuf.Pos >= prvUart[UartID].TxBuf.MaxLen)
	{
		// 只有少量数据，只靠FIFO就能填充满，就不需要重新分配内存

		memset(&prvUart[UartID].TxBuf, 0, sizeof(prvUart[UartID].TxBuf));
#ifdef __BUILD_OS__
		prvUart[UartID].TxCacheBuf.Pos = 0;
#endif
		ISR_OnOff(prvUart[UartID].IrqLine, 1);
		Uart->OFFSET_4.IER |= UART_IER_ETBEI|UART_IER_ELSI;
		return 0;
	}
	else
	{
		// 数据多，暂时发不完，就需要为缓存重新分配内存
#ifdef __BUILD_OS__
		OS_InitBuffer(&prvUart[UartID].TxCacheBuf, TX_BUF_INIT);
#endif
		ISR_OnOff(prvUart[UartID].IrqLine, 1);
		Uart->OFFSET_4.IER |= UART_IER_PTIME|UART_IER_ETBEI|UART_IER_ELSI;
		return 1;
	}
}

#ifdef __BUILD_OS__
void Uart_BufferTxStop(uint8_t UartID)
{
	UART_TypeDef* Uart = (UART_TypeDef*)prvUart[UartID].RegBase;
	Uart->OFFSET_4.IER &= ~(UART_IER_PTIME|UART_IER_ETBEI);
	ISR_OnOff(prvUart[UartID].IrqLine, 0);
	OS_DeInitBuffer(&prvUart[UartID].TxBuf);
	prvUart[UartID].TxCacheBuf.Pos = 0;
	ISR_OnOff(prvUart[UartID].IrqLine, 1);
}
#endif

static uint32_t prvUart_FifoRead(uint8_t UartID, uint8_t *Data, uint8_t Len)
{
	uint32_t i = 0;
	UART_TypeDef* Uart = (UART_TypeDef*)prvUart[UartID].RegBase;

	while (Uart->USR & UART_STATUS_RX_FIFO_NOT_EMPTY && (--Len))
	{
		Data[i] = Uart->OFFSET_0.RBR;
		i++;
	}
	return i;

}

static void Uart_CacheRead(uint8_t UartID, uint8_t Len)
{
	uint8_t Flag = 0;
	if ((prvUart[UartID].RxBuf.Pos + 32) > prvUart[UartID].RxBuf.MaxLen)
	{
		prvUart[UartID].RxBuf.Pos += prvUart_FifoRead(UartID, &prvUart[UartID].RxBuf.Data[prvUart[UartID].RxBuf.Pos], Len);
		OS_ReSizeBuffer(&prvUart[UartID].RxBuf, prvUart[UartID].RxBuf.MaxLen * 2);
	}
	else
	{
		prvUart[UartID].RxBuf.Pos += prvUart_FifoRead(UartID, &prvUart[UartID].RxBuf.Data[prvUart[UartID].RxBuf.Pos], Len);
	}
}

uint32_t Uart_FifoRead(uint8_t UartID, uint8_t *Data)
{
	uint32_t i = 0;
	UART_TypeDef* Uart = (UART_TypeDef*)prvUart[UartID].RegBase;

	while (Uart->USR & UART_STATUS_RX_FIFO_NOT_EMPTY)
	{
		Data[i] = Uart->OFFSET_0.RBR;
		i++;
	}
	return i;

}

void Uart_RxBufferCB(uint8_t UartID, CBFuncEx_t CB)
{
#ifdef __BUILD_OS__
	uint32_t ReadLen;
	if (!prvUart[UartID].RxCacheMode)
	{
		return ;
	}
	ISR_OnOff(prvUart[UartID].IrqLine, 0);
	if (!CB(prvUart[UartID].RxBuf.Data, (void *)prvUart[UartID].RxBuf.Pos))
	{
		prvUart[UartID].RxBuf.Pos = 0;
		if (prvUart[UartID].RxBuf.MaxLen > RX_BUF_HIGH)
		{
			OS_ReInitBuffer(&prvUart[UartID].RxBuf, RX_BUF_INIT);
		}
	}
	ISR_OnOff(prvUart[UartID].IrqLine, 1);
#endif
}

uint32_t Uart_RxBufferRead(uint8_t UartID, uint8_t *Data, uint32_t Len)
{
#ifdef __BUILD_OS__
	uint32_t ReadLen;
	if (!prvUart[UartID].RxCacheMode)
	{
		return 0;
	}
	ISR_OnOff(prvUart[UartID].IrqLine, 0);
	if (!Data || !Len)
	{
		ReadLen = prvUart[UartID].RxBuf.Pos;
		ISR_OnOff(prvUart[UartID].IrqLine, 1);
		return ReadLen;
	}
	ReadLen = (prvUart[UartID].RxBuf.Pos < Len)?prvUart[UartID].RxBuf.Pos:Len;
	memcpy(Data, prvUart[UartID].RxBuf.Data, ReadLen);
	OS_BufferRemove(&prvUart[UartID].RxBuf, ReadLen);
	if (!prvUart[UartID].RxBuf.Pos && prvUart[UartID].RxBuf.MaxLen > RX_BUF_HIGH)
	{
		OS_ReInitBuffer(&prvUart[UartID].RxBuf, RX_BUF_INIT);
	}
	ISR_OnOff(prvUart[UartID].IrqLine, 1);
	return ReadLen;
#else
	return 0;
#endif
}

void Uart_RxBufferClear(uint8_t UartID)
{
	uint32_t ReadLen;
	if (!prvUart[UartID].RxCacheMode)
	{
		return ;
	}
	ISR_OnOff(prvUart[UartID].IrqLine, 0);
	prvUart[UartID].RxBuf.Pos = 0;
	ISR_OnOff(prvUart[UartID].IrqLine, 1);
}
#ifdef __BUILD_OS__
static void prvUart_Tx(uint8_t UartID, UART_TypeDef* Uart)
{
	if (prvUart[UartID].TxBuf.Data)
	{
		while ((prvUart[UartID].TxBuf.Pos < prvUart[UartID].TxBuf.MaxLen) && (Uart->USR & UART_STATUS_TX_FIFO_NOT_FULL))
		{
			Uart->OFFSET_0.THR = prvUart[UartID].TxBuf.Data[prvUart[UartID].TxBuf.Pos];
			prvUart[UartID].TxBuf.Pos++;
		}
		if (prvUart[UartID].TxBuf.Pos >= prvUart[UartID].TxBuf.MaxLen)
		{
#ifdef __BUILD_OS__
			OS_DeInitBuffer(&prvUart[UartID].TxBuf);
			Uart_BufferTx(UartID, NULL, 0);
#else
			memset(&prvUart[UartID].TxBuf, 0, sizeof(prvUart[UartID].TxBuf));
#endif
		}
	}
#ifdef __BUILD_OS__
	else if (prvUart[UartID].TxCacheBuf.Pos)
	{
		Uart_BufferTx(UartID, NULL, 0);
	}
	if (!prvUart[UartID].TxBuf.Data && !prvUart[UartID].TxCacheBuf.Pos)
#else
	if (!prvUart[UartID].TxBuf.Data)
#endif
	{
		if (Uart->OFFSET_4.IER & UART_IER_PTIME)
		{
			Uart->OFFSET_4.IER &= ~UART_IER_PTIME;
			prvUart[UartID].Callback((uint32_t)UartID, (void *)UART_CB_TX_BUFFER_DONE);
		}
		else
		{
			Uart->OFFSET_4.IER &= ~UART_IER_ETBEI;
			prvUart[UartID].Callback((uint32_t)UartID, (void *)UART_CB_TX_ALL_DONE);
		}
	}
}
#endif

static void prvUart_IrqHandle(int32_t IrqLine, void *pData)
{
	uint8_t UartID = (uint32_t)pData;
	UART_TypeDef* Uart = (UART_TypeDef*)prvUart[UartID].RegBase;
	uint32_t reg_value, read_len;
	switch(Uart->OFFSET_8.IIR & 0x0f)
	{
	case UART_IT_ID_RX_RECVD:
		{
//			Uart->SRT = UART_FIFO_RX_Trigger_1_2_Full;
#ifdef __BUILD_OS__
			if (prvUart[UartID].RxCacheMode)
			{
				Uart_CacheRead(UartID, 8);
				break;
			}
#endif

			prvUart[UartID].Callback((uint32_t)UartID, (void *)UART_CB_RX_NEW);
		}
		break;
	case UART_IT_ID_TX_EMPTY:
		{
#ifdef __BUILD_OS__
			prvUart_Tx(UartID, Uart);
#endif
		}
		break;
	case UART_IT_ID_MODEM_STATUS:
		{
			reg_value = Uart->MSR;
		}
		break;
	case UART_IT_ID_LINE_STATUS:
		{
			reg_value = Uart->LSR;
			if (reg_value & UART_LSR_TEMT)
			{
#ifdef __BUILD_OS__
				prvUart_Tx(UartID, Uart);
#endif

			}
			if (reg_value & (UART_LSR_PFE|UART_LSR_BI|UART_LSR_FE|UART_LSR_PE|UART_LSR_OE))
			{
				prvUart[UartID].LastError = reg_value;
				prvUart[UartID].Callback((uint32_t)UartID, (void *)UART_CB_ERROR);
			}
		}
		break;
	case UART_IT_ID_BUSY_DETECT:
		{
			reg_value = Uart->USR;
		}
		break;
	case UART_IT_ID_CHAR_TIMEOUT:

#ifdef __BUILD_OS__
#ifdef __RX_USE_DMA__
		if (prvUart[UartID].RxCacheMode)
		{
			prvUart_RxDMADone(UartID);
		}
#else
		if (prvUart[UartID].RxCacheMode)
		{
			Uart_CacheRead(UartID, 33);
		}
#endif
#endif
		prvUart[UartID].Callback((uint32_t)UartID, (void *)UART_CB_RX_TIMEOUT);
		break;
	default:
		break;
	}
}



void Uart_PrintReg(uint8_t UartID)
{
	UART_TypeDef* Uart = (UART_TypeDef*)prvUart[UartID].RegBase;
	DBG("%x, %x, %x", Uart->LCR, Uart->OFFSET_4.IER, Uart->SRT);
}

void Uart_ChangeBR(uint8_t UartID, uint32_t BaudRate)
{
	UART_TypeDef* Uart = prvUart[UartID].RegBase;
	Uart->LCR |= UART_LCR_DLAB;

	// baud rate = (serial clock freq) / (16 * divisor).
	uint32_t tmpBaudRateDiv = (SystemCoreClock >> 6) / BaudRate;
	Uart->OFFSET_0.DLL = (tmpBaudRateDiv & 0x00FF);
	Uart->OFFSET_4.DLH = ((tmpBaudRateDiv >> 8) & 0x00FF);

	/* LCR = 0 */
	Uart->LCR &= ~UART_LCR_DLAB;
}

uint32_t Uart_GetLastError(uint8_t UartID)
{
	return prvUart[UartID].LastError;
}

void Uart_Sleep(uint8_t UartID, uint8_t OnOff)
{
    if (UartID != DBG_UART_ID)
    {
    	PM_SetHardwareRunFlag(PM_HW_UART_0 + UartID, OnOff);
    }
}