rs232.c

rs

#include "oaks_sfr.h"
#include "rs232.h"

/*function define*/
void receive();				/* Receive interruption function			*/
#pragma INTERRUPT  receive

/*UART communicate sign*/
#define TRANS_SIGN		'T'
#define READY_SIGN		'K'
#define FINISH_SIGN		'F'

/*UART state */
#define RECEIVING		0xff
#define WATINGSIZE_H	0x0f
#define WATINGSIZE_L	0x10
#define READY			0x01
#define WATING			0x00
#define TRANSING		0x20
#define WATINGTRANS		0x21

/*Globle variable define*/
static unsigned char	g_FrameOk;		//	/*是否接收到一个数据帧*/
static unsigned char	g_UartStat;		///*是否正在从串口接受数据接受*/
static unsigned int		g_FrameCount;	//	/*已接收数据包大小*/
static unsigned int		g_FrameSize;	//	/*接收到的数据包大小*/
unsigned char	g_RecvFrame[MAX_FRAME_SIZE];	//	/*接受缓存*/
static unsigned int		g_Tmp;
static unsigned char		g_Led;
#define DELAY(x)		g_Tmp=x;while(g_Tmp--)
#define SEND_BYTE(b)	u0tb=b;while(!ti_u0c1)	//串口发送一字节数据


void Rs232Init()
{
	
	u0mr = 0x05;					/* Transmit/Receive Mode register*/
									/* asynchronous, 8bit,non-parity	*/
									/* non-sleep						*/

	u0c0 = 0x10;					/* UART0 Transmit/Receive Control register0 f1 is chosen*/
	u0brg = UART_SPEED;					/* UART0 Bit Rate generator					*/
									
	s0ric = 0x06;					/* Set interruption level				*/
	u0c1 = 0x05;					/* UART0 Transmit/Receive Control register1  Set to start transmit/receive */
	/* _asm( "\tFSET	I");			Set interruption enable					*/

	g_FrameOk=NULL;			/*初始化全局变量*/
	g_UartStat=WATING;
	g_FrameCount=NULL;
	g_FrameSize=NULL;
	g_Led=0x01;

}

/**************************************************************************
*       Transmit/Receive Interruption function : receive()
**************************************************************************/
void receive()
{
	unsigned char rdata;						/* Receive buffer						*/

	rdata = u0rb;					/* Receiving data						*/
	
	/*rdata &= 0x0ff;					 Transmitting received data					
	u0tb = rdata;*/	
		 //*根据全局变量标识 确定对接收到的数据的处理*/
	switch(g_UartStat)	
	{//*接受状态时继续接收一个字节数据*/
//	case RECEIVING: 
		
		
		/*g_FrameCount++; 计数已接收数据的全局变量*/
		/*if(g_FrameCount==g_FrameSize)  接受到对方指定数量的数据后停止*/
		
		//	g_FrameOk=1;
		

	//	break;
//*接受数据帧大小的量 的高8位*/
	case WATINGSIZE_H:	
		g_FrameSize=rdata;
		g_FrameSize=g_FrameSize<<8;
		g_UartStat=WATINGSIZE_L;
		break;
//*接受数据帧大小的量 的低8位*/
	case WATINGSIZE_L:	
		g_FrameSize |=rdata;
		g_UartStat=RECEIVING;
		
		break;
//*等待中*/
	case WATING:	
		if(rdata==TRANS_SIGN) /*收到发送请求 */
		{
			g_UartStat=WATINGSIZE_H;
			g_FrameCount=NULL;
			/*反馈信号 标识ok	*/
			SEND_BYTE(READY_SIGN);
		}
		break;
	/*发送状态时 等待对方的ok信息*/
	case WATINGTRANS:
		if(rdata==READY_SIGN)
		{
			g_UartStat=TRANSING;//ok 开始传送 和sendframe函数配合
		}
		break;
	
	}
}

int RecvFrame(unsigned char **buf)/*接收数据帧*/
{
	g_FrameOk=NULL;
	/*g_FrameCount=NULL;
	g_UartStat=WATING;*/
	while(g_UartStat!=RECEIVING)
		;
	s0ric = 0x00;
	for(;g_FrameCount<g_FrameSize;g_FrameCount++)
	{
		while(!ri_u0c1)
			;
		g_RecvFrame[g_FrameCount]=u0rb;
		
		/*rdata = u0rb;					 Receiving data						*/

	}
	/*while(!g_FrameOk)在数据帧接受完毕之前 处于等待状态*/
	g_UartStat=WATING;

	s0ric = 0x06;
	*buf=g_RecvFrame;

	return g_FrameSize;
}


int SendFrame(const unsigned char *buf,int len)
{
	int i;
	unsigned char tmp;

	g_UartStat=WATINGTRANS;
	g_FrameOk=NULL;

	SEND_BYTE(TRANS_SIGN);
	while(g_UartStat!=TRANSING)/*收到ok标识之前等待*/
		;
	tmp=len>>8;		//发送数据帧大小 先高位后低位
	SEND_BYTE(tmp);	
	tmp=len;	
	SEND_BYTE(tmp);

	for(i=0;i<len;i++)/*发送数据帧*/
	{
		SEND_BYTE(buf[i]);
		//DELAY(500);
	}
	g_UartStat=WATING;
	p7=0xff^g_Led;
	g_Led=g_Led<<1;
	if(g_Led==0)
		g_Led=0x01;
	return len;

}