基于51系列单片机多机通信实例程序

/*从机2的接收程序*/ #include <reg51.h> //数据定义格式为7E +从机地址+主机地址+命令+数据+校验（这一次作实验校验就不做了）+7E code unsigned char a[]={0x3f,0x06,0x5b,0x4f, 0x66,0x6d,0x7d,0x07, 0x7f,0x6f,0x77,0x7c, 0x39,0x5e,0x79,0x71}; code unsigned char b[]={0xfe,0xfd}; //,,,,,共阳数码管 unsigned char led[2]={0}; /*定义一个结构提*/ struct DatePacket { unsigned char MinorAddr; //从机地址 unsigned char MainAddr; //主机地址 unsigned char Comand;//51表示后面跟的为数据、52表示后面跟的是命令 AA为 （OK）A5为（Error） //要求在数据中决不允许出现 51 52 AA A5 7E（为标志）这几个数据,刚好 //我们要传的数据中只需要低四位即可将高4位全部清0，决不会出现上面列出的数据 unsigned char KeyDate; //此为按键数据 只需要低四位 高四位清0 } RevDate; unsigned char flag=2; //0--表示成功 1--表示失败,2--表示没有收到数据或数据没有收完 /*延时子函数*/ void delay(unsigned char delaytime) { unsigned char jj,jjj; for(jj=0;jj<delaytime;jj++) { for(jjj=0;jjj<200;jjj++); } } /*显示函数*/ void disp(void) //,,,,,,显示函数最好不要有循环 { static unsigned char k; led[0]=RevDate.KeyDate/10; led[1]=RevDate.KeyDate%10; P0=0;//你没有消影 P0=a[led[k]]; P2=b[k]; if(k++>=2) k=0; } /*初始化函数*/ void EsInit(void) { ES=1; SCON=0X50; TMOD=0X20; TH1=TL1=-3; TR1=1; EA = 1; } /*中断接收*/ void RevInterruptInt1(void) interrupt 4 { static unsigned char sys;//定义一个静态变量 unsigned char ReceiveData; if( RI == 1 ) { RI=0; TI=0; ReceiveData=SBUF; switch(sys) { case 0: if(ReceiveData!=0x7E) { sys=0; flag=2;} else sys=1; //先收报头 break; case 1: if(ReceiveData==0x7E) { sys=0; flag=2;} if(ReceiveData!=0x62) { sys=0; flag=2;} else { sys=2; RevDate.MinorAddr=ReceiveData;} //再收从机地址 break; case 2: if(ReceiveData!=0x60) { sys=0;flag=2;} else { sys=3; RevDate.MainAddr=ReceiveData;} //主机地址 break; case 3: sys=4; RevDate.Comand=ReceiveData; //命令 break; case 4: sys=5; RevDate.KeyDate=ReceiveData; // 按键数据 P1=RevDate.KeyDate; //调试语句 break; case 5: if(ReceiveData!=0x7b) flag=1; //帧完 else flag=0; // sys=0; //,,,,,,,,,这条指令搞忘了 break; } } else TI=0; } /*主函数*/ void main(void) { EsInit(); RevDate.KeyDate=0; while(1) { disp(); delay(10); } }