sermem.c

基于NXP2200平台的OS移植模板

/** @file	Sermem.c
* @brief	串口部分内存管理文件, 如有问题请联系作者
* @Author	[e-mail] 2007-9-26 19:13
* @Modify
*/
#include "option.h"

#include "tcuart.h"
#include "Sermem.h"

/** 定义每个串口对应的缓冲区*/
static	uint8	U0_TxBuf[U0_TXBUF_LEN];
static	uint8	U0_RxBuf[U0_RXBUF_LEN];
static	uint8	U1_TxBuf[U1_TXBUF_LEN];
static	uint8	U1_RxBuf[U1_RXBUF_LEN];

/** 把收发各个缓冲区程度定义在一个数组中*/
uint16	U_TXBUF_LEN[] = {
	U0_TXBUF_LEN, U1_TXBUF_LEN,
};
uint16	U_RXBUF_LEN[] = {
	U0_RXBUF_LEN, U1_RXBUF_LEN,
};

/** 定义串口缓冲*/
static S_UartBuf_t	Uart_Buf[UART_CNT];

/** @func UartInitFifo
* @brief 初始化串口对应缓冲区
*/
void
UartInitBuf(uint8 fd)
{
	switch (fd) {
	case 0: {
		Uart_Buf[0].RecvBufPtr	= U0_RxBuf;
		Uart_Buf[0].Recv_in		= U0_RxBuf;
		Uart_Buf[0].Recv_out	= U0_RxBuf;
		Uart_Buf[0].Recv_BufFull= 0;

		Uart_Buf[0].SendBufPtr	= U0_TxBuf;
		Uart_Buf[0].Send_in		= U0_TxBuf;
		Uart_Buf[0].Send_out	= U0_TxBuf;
		Uart_Buf[0].Send_BufFull= 0;

		Uart_Buf[0].Tx_Idle		= 1;
		break;
	}
	case 1: {
		Uart_Buf[1].RecvBufPtr	= U1_RxBuf;
		Uart_Buf[1].Recv_in		= U1_RxBuf;
		Uart_Buf[1].Recv_out	= U1_RxBuf;
		Uart_Buf[1].Recv_BufFull= 0;

		Uart_Buf[1].SendBufPtr	= U1_TxBuf;
		Uart_Buf[1].Send_in		= U1_TxBuf;
		Uart_Buf[1].Send_out	= U1_TxBuf;
		Uart_Buf[1].Send_BufFull= 0;

		Uart_Buf[1].Tx_Idle		= 1;
		break;
	}
	default:
		break;
	}
}

/** @func UartPutc
* @brief 串口写数据到缓冲区
*		 底层接口函数
* @Retval	D_OK	 成功
*			D_ERR	 无数据
*/
D_Result
UartPutc(uint8 fd, uint8 dat)
{
	uint8	*ptr;

	/** 接收缓冲区已满*/
	if (Uart_Buf[fd].Recv_BufFull) {
		return D_ERR;
	}

	ptr = Uart_Buf[fd].Recv_in; ptr++;
	if (ptr == Uart_Buf[fd].RecvBufPtr+U_RXBUF_LEN[fd]) {
		ptr =  Uart_Buf[fd].RecvBufPtr;
	}
	if (ptr == Uart_Buf[fd].Recv_out) {
		Uart_Buf[fd].Recv_BufFull = 1;
		return D_ERR;
	}

	*Uart_Buf[fd].Recv_in	= dat;
	Uart_Buf[fd].Recv_in	= ptr;

	return D_OK;
}

/** @func UartGetc
* @brief 串口从缓冲区读取数据
*		 底层接口函数
* @Retval	D_OK	 成功
*			D_ERR	 无数据
*/
D_Result
UartGetc(uint8 fd, uint8 *dat)
{
	/** 发送缓冲区无数据*/
	if (Uart_Buf[fd].Send_out == Uart_Buf[fd].Send_in) {
		Uart_Buf[fd].Tx_Idle = 1;
		return D_ERR;
	}
	*dat = *(Uart_Buf[fd].Send_out++);
	if (Uart_Buf[fd].Send_out == Uart_Buf[fd].SendBufPtr+U_TXBUF_LEN[fd]) {
		Uart_Buf[fd].Send_out =  Uart_Buf[fd].SendBufPtr;
	}

	/** 处理标志位*/
	if (Uart_Buf[fd].Send_BufFull) {
		Uart_Buf[fd].Send_BufFull = 0;
	}

	return 0;
}

/** @func UsrPutc
* @brief 用户写数据到缓冲区
*		 API函数
* @Retval	D_OK	 成功
*			D_ERR	 BUFF已满
*/
D_Result
UsrPutc(uint8 fd, uint8 dat)
{
	uint8	*ptr;

	if (Uart_Buf[fd].Send_BufFull) {
		return D_ERR;
	}

	ptr = Uart_Buf[fd].Send_in; ptr++;
	if (ptr == Uart_Buf[fd].SendBufPtr+U_TXBUF_LEN[fd])
		ptr =  Uart_Buf[fd].SendBufPtr;
	if (ptr == Uart_Buf[fd].Send_out) {
		Uart_Buf[fd].Send_BufFull = 1;
		UartFlush(fd);
		return D_ERR;
	}
	*Uart_Buf[fd].Send_in	= dat;
	Uart_Buf[fd].Send_in	= ptr;

	return D_OK;
}

/** @func UsrGetc
* @brief 用户写数据到缓冲区
*		 API函数
* @Retval	D_OK	 成功
*			D_ERR	 BUFF已满
*/
D_Result
UsrGetc(uint8 fd, uint8 *dat)
{
	/** 接收缓冲区无数据*/
	if (Uart_Buf[fd].Recv_out == Uart_Buf[fd].Recv_in) {
		return D_ERR;
	}

	*dat = *(Uart_Buf[fd].Recv_out++);
	if (Uart_Buf[fd].Recv_out == Uart_Buf[fd].RecvBufPtr+U_RXBUF_LEN[fd]) {
		Uart_Buf[fd].Recv_out =  Uart_Buf[fd].RecvBufPtr;
	}

	/** 处理标志位*/
	if (Uart_Buf[fd].Recv_BufFull) {
		Uart_Buf[fd].Recv_BufFull = 0;
	}

	return D_OK;
}

/** @func UsrGetc
* @brief 开始发送缓冲区中数据
*/
D_Result
UartFlush(uint8 fd)
{
	switch (fd) {
	case 0:
	case 1: {
		if (Uart_Buf[fd].Tx_Idle == 1) {
			Uart_Buf[fd].Tx_Idle = 0;
			__UART_Flush(fd);
		}
		return D_OK;
	}
	default:
		break;
	}
	return D_ERR;
}