cm.c

计算机锁机系统由软件和硬件组成。软件由Visual Basic 6.0编写。硬件主要由无线发送模块和单片机（C语言编写）构成。通过RS232界面与PC通信而实现无线控制系统。 主要功能

#include <AT89X51.H>
#define uchar unsigned char
void mDelay(unsigned int Delay);

uchar str1[4]={226,98,0,0};  //定义发送的字节数
uchar indate[4];
uchar ap;
uchar count, count_r=0;

void main()
{
	
	/* 系统初始化 */
	TMOD = 0x20;	//定时器T1使用工作方式2
	TH1 = 253;    // 设置初值
	TL1 = 253;
	TR1 = 1;    // 开始计时
	PCON = 0x80;    // SMOD = 1
	SCON = 0x50;	//工作方式1，波特率9600bps，允许接收
	ES = 1;
	EA = 1;    // 打开所以中断
	TI = 0;
	RI = 0;
		P1=0xff;
		P3_5=0;
		while(1)
		{
			ap=P1;
			while(ap==P1)
			{;}
				str1[2] = P1;
				str1[3] = str1[2];
				count = 1;
				SBUF=str1[0];
				P3_7=0;
				mDelay(300);
	 			while(P1!=ap)
				{;}
		}
}

void RSINTR() interrupt 4 using 2
{
	if(TI==1)
	{
		TI=0;
		if(count < 4)
		{
			SBUF= str1[count];
			count++;
		}
		else
		{
			mDelay(80);
			P3_7=1;
		}
	}
	if(RI==1)
	{	
		indate[count_r]=SBUF;
		count_r++;
		if (count_r >=4)
		{
			RI=0;
			count_r=0;
			if (indate[0]==str1[0] && indate[1]==str1[1])
			{
				switch (indate[2])
				{
					case 109:
						P3_4=1;
						P3_5=0;
						break;
					case 45:
						P3_4=0;
						P3_5=1;
						str1[2] = 157;
						str1[3] = 157;
						count = 1;
						SBUF=str1[0];
						break;
				}
			}
			else 
			{
				count_r=0;
			}
				
		}
		RI=0;
	}

}

void mDelay(unsigned int Delay)
{   unsigned int i;
	for(;Delay>0;Delay--)
	{ 	for(i=0;i<124;i++)
		{;}
	}
}