aa.txt

Gps数据的获得及处理

#include "reg51.h"
#include< intrins.h>
typedef unsigned char uchar;
typedef unsigned char uChar;
typedef unsigned  int ushort;
typedef unsigned short uInt2;
typedef unsigned char BYTE;
typedef uChar BOOL;
#define FALSE 0
#define TRUE 1

#define Pro_Head0	0
#define Pro_Head1	1
#define Pro_Type	2
#define Pro_StationNum	3
#define	Pro_LineNum	4
#define	Pro_UpDown	5
#define	Pro_CheckSumHigh	6
#define Pro_CheckSumLow	7


void Init(void);
void delay(uchar);
void SendCharsToSerial(uchar *p,uchar);
void PrintNum(uChar i);

uChar gReceiveState = Pro_Head0;
uChar pReceiveBuffer[8] ; 
uChar gReceiveTimeout = 8;
uChar gSerialReceiveFlag=0;
uChar gSendTimeout = 0; 
uChar gSendArray=0;
uChar gSendBit=0;
#define OpenInt0AndCloseSerial()	EX0=1; ES=0;
#define CloseInt0AndOpenSerial()	EX0=0; ES=1;

sbit CLK = P1^0;
sbit DAT = P1^7;


void Init(void)
{
	_nop_();
	TMOD=0x21;
	TH0=0xfa;
	TL0=0x00;
	ET0=1;
	EX0=0;
	EX1=0;
	TH1=0xfd;
	TL1=0xfd;
	ET1=0;
	//PCON=0x80;	//bandrate=19200 for 11.0592
 	PCON=0x00;		//bandrate=19200 for 22.1184
	SCON=0x50;
	RI=TI=0;
	ES=1;
	TR1=1;
	TR0=1;
	EA=1;
	IT0=1;
	CloseInt0();

}
void SendCharsToSerial(uchar *p,uchar count)
{
	uchar i;
	for(i=0 ; i<count; i++)
	{
		SBUF = p[i];
		while(!TI);
		TI=RI=0;
	}
}
void PrintNum(uChar i)
{
	#define SBUF_SERIAL SBUF=tTemp + 0x30; \
						while(!TI); \
						TI=RI=0
	uChar tTemp = i/100;
	SBUF_SERIAL;
	tTemp = (i%100)/10;
	SBUF_SERIAL;
	tTemp = i%10;
	SBUF_SERIAL;
}
void Timer0()interrupt 1
{
	TR0 = 0 ;
	TH0=0xfb;
	TL0=0xf5; //550us
	TR0 = 1 ;

//CLK=~CLK;

	if(gReceiveTimeout)
		gReceiveTimeout--;
	if(gSendTimeout)
		gSendTimeout--;
}
const uChar  ByteMap[]={0x80,0x40,0x20,0x10,0x08,0x04,0x02,0x01};
void Int0() interrupt 0
{
	if((gSendArray==0)&&(gSendBit==0))
		return;
	if(pReceiveBuffer[8-gSendArray]&ByteMap[8-gSendBit])
		DAT =1;
	else
		DAT =0;
	gSendBit-=1;
	if((gSendBit==0)&&(gSendArray))
	{	
		gSendArray--;
		gSendBit=8;
	}
}

void delay(uChar a)//delay(1) for 100ms 
{
	uChar i,j,k;
	for(k=0 ;k<a; k++)
		for(i=0 ;i<200; i++)
			for(j=0 ;j<200; j++)
				_nop_();
}

void Serial_int(void) interrupt 4 
{
	static uInt2 sReceiveCheckSum = 0;
	uChar   c;
	if(_testbit_(RI))
	{
	
		RI=0;
		TI=0;
		c=SBUF;

		switch(gReceiveState)
		{
			case	Pro_Head0:
					if(c==0x3a)
					{
						gReceiveState=Pro_Head1;
						pReceiveBuffer[0]=c;
						sReceiveCheckSum=c;								
						gReceiveTimeout=8; 
					}

					break;
			
			case	Pro_Head1:
					if(c==0x3a)
					{
						gReceiveState=Pro_Type;
						pReceiveBuffer [1]=0x3a;
						sReceiveCheckSum +=c;
						if(gReceiveTimeout==0)
 				    		gReceiveState=Pro_Head0;
						else
							gReceiveTimeout=8; 
					}
					else	
						gReceiveState=Pro_StationNum;
 					break;
			case	Pro_Type:
					if((c==0x11)||(c==0x22)||(c==0x55)||(c==0x66))
					{
						pReceiveBuffer [2]=c;
						gReceiveState = Pro_StationNum;
						sReceiveCheckSum +=c;
						if(gReceiveTimeout==0)
 				    		gReceiveState=Pro_Head0;
						else
							gReceiveTimeout=8; 
					}
					else	
						gReceiveState=Pro_Head0;
 					break;

			case	Pro_StationNum:
					gReceiveState=Pro_LineNum;
					pReceiveBuffer [3] =c;
					sReceiveCheckSum+=c;
					if(gReceiveTimeout==0)
 				    		gReceiveState=Pro_Head0;
					else
							gReceiveTimeout=8; 
					break;

			case	Pro_LineNum:	
					pReceiveBuffer [4] =c;
					gReceiveState = Pro_UpDown;
					sReceiveCheckSum+=c;
					if(gReceiveTimeout==0)
 				    	gReceiveState=Pro_Head0;
					else
						gReceiveTimeout=8; 
					break;
			
			case	Pro_UpDown:
					pReceiveBuffer [5] =c;
			//		gReceiveState = Pro_CheckSumHigh;

					gReceiveState = Pro_Head0;//test
					sReceiveCheckSum+=c;
					if(gReceiveTimeout==0)
 				    	gReceiveState=Pro_Head0;
					else
						gReceiveTimeout=8; 
					gSerialReceiveFlag=1;//test
					break;
			
			case	Pro_CheckSumHigh:
					
					if(c==(uChar)(sReceiveCheckSum>>8))
					{
						gReceiveState = Pro_CheckSumLow;
						pReceiveBuffer[6]=c;
					}
					if(gReceiveTimeout==0)
 				    		gReceiveState=Pro_Head0;
					else
						gReceiveTimeout=8;
					break;
			
			case	Pro_CheckSumLow:
					if(sReceiveCheckSum==c)	
					{
						gSerialReceiveFlag=1;
						pReceiveBuffer[7]=c;
					}
					gReceiveState=Pro_Head0;
					break;
			
			default:
					gReceiveState=Pro_Head0;
					break;
		}

	}
}


void main(void)
{
	Init();
	pReceiveBuffer[0]=0x51;
	pReceiveBuffer[1]=0x52;
	pReceiveBuffer[2]=0x53;
	pReceiveBuffer[3]=0x54;	
	pReceiveBuffer[4]=0x55;
	pReceiveBuffer[5]=0x56;	
	pReceiveBuffer[6]=0x57;
	pReceiveBuffer[7]=0x58;	

	while(1)
	{
	//	delay(25);
		if(gSerialReceiveFlag == 1)
		{
			gSerialReceiveFlag = 0;
			gSendArray =8;
			gSendBit=8;
			OpenInt0AndCloseSerial();
			gSendTimeout = 200;
		}
		if((gSendArray==0)&&(gSendBit ==0))
		{
			CloseInt0AndOpenSerial();
		}else
		{
			if(gSendTimeout ==0)
			{
				gSendArray =8;
				gSendBit=8;
			}
		}

	}//while(1)
}