copy of rf51.c

8051单片机用的315M射频发射及接收程序模块

#include <reg51.h>
#include <intrins.h>
#define uint unsigned int
#define uchar unsigned char

uchar a _at_ 0x30; 
uchar b _at_ 0x31;
uchar c _at_ 0x32;
uchar d _at_ 0x33;
uchar counth,countl,countt,temp,countfh,flaghe;
sbit rfin=P3^1;
sbit led=P1^1;

void init();
void getdata();

void main()
{
	uchar m,n;
	init();
	while(1)
	{
		while(countt<33)
		{
			if(counth>=2 && counth<=3)
			{
				if(!flaghe && countl==0)
				{
					countfh=counth;
					flaghe=1;
				}
				if(!flaghe && countl!=0)
				{
					break;
				}
				
				if(countfh==counth)
				{
					if(countl>=28 && countl<=30)
					{	
						counth=0;
						countl=0;
						countt=0;
						flaghe=0;
						countfh=0;
						getdata();
						break;
					}
				}
				else
				{
					break;
				}
			}
			if(a==98)
			{
				led=0;
				for(m=200;m>0;m--)
					for(n=200;m>0;m--);
			}
		}
		counth=0;
		countl=0;
		countt=0;
		flaghe=0;
		countfh=0;
	}
	
}

void init()
{
	P1=0xff;
	P3=0xff;
	flaghe=0;
	countfh=0;
	countfh=0;
	countt=0;
	temp=0;
	TMOD=0x01;
	TH0=(65536-100)/256;
	TL0=(65536-100)%256;
	IE=0x82;
	TR0=1;

}

void getdata()
{
	uchar countd,x;
	countd=0;
	x=0;
	while(!rfin);
	counth=0;
	countl=0;
	while(countd<32)
	{
		x++;
		if(counth>=2 && counth<=3)
		{
			if(!flaghe && countl==0)
			{
				countfh=counth;
				flaghe=1;
			}
			if(!flaghe && countl!=0)
			{
				break;
			}
			if(countfh==counth)
			{
				if(countl>7 && countl<=9)
				{
					temp=temp&0xfe;
					counth=0;
					countl=0;
					countfh=0;
					flaghe=0;
					countd++;
					while(!rfin);	
				}
			}
			else
			{
				break;
			}
		}
		if(counth>7 && counth<=9)
		{
			if(!flaghe&& (countl==0))
			{
				countfh=counth;
				flaghe=1;
			}
			if(countfh==counth)
			{
				if(countl>=2 && countl<=3)
				{
					temp=temp|0x01;
					counth=0;
					countl=0;
					countfh=0;
					flaghe=0;
					countd++;
					while(!rfin);
				}
			}
			else
			{
				continue;
			}
		}
		
		switch (countd)
		{
			case 7:a=temp;break;
	        case 15:b=temp;break;
			case 23:c=temp;break;
			case 31:d=temp;break;
		}
		temp<<=1;
		if(x>9 && countl==0) continue;
	}
}

void timer0() interrupt 1
{
	TH0=(65536-100)/256;
	TL0=(65536-100)%256;
	countt++;
	if(rfin)	
		counth++;
	if(!rfin)
		countl++;
}