利用单片机串口实现甲乙两机的数据传输

#include<reg51.h>
#define uchar unsigned char
char code map[]={
    0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x6F,0x77,0x7c,0x39,0x5e,0x79,0x71
};

void delay(unsigned int time){
    unsigned int j = 0;
    for(;time>0;time--)
    for(j=0;j<125;j++);
}
void main(void){
    uchar counter=0; //定义计数器
    TMOD=0x20;       //T1定时方式2
    TH1 = TL1 = 0xf4;//2400b/s
    PCON=0;            //波特率不加倍
    SCON = 0X50;    //串口方式1，TI和RI清零，允许收敛
    TR1=1;                 //启动TI
    while(1){
        SBUF = counter;//发送联络信号
        while(TI==0);     //等待发送完成
        TI=0;                 //清TI标志位
        while(RI==0);    //等待乙机回答
        RI=0;
        if(SBUF == counter){   //若返回值与发送值相同，组织新数据
            P2 = map[counter];//显示已发送值
            if(++counter>15) counter=0;//修正计数器值
            delay(1000);
        }
    }
}

#include<reg51.h>
#define uchar unsigned char
char code map[]={
    0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x6F,0x77,0x7c,0x39,0x5e,0x79,0x71
};


void main(void){
    uchar receive;      //定义接收缓冲
    TMOD=0x20;          //TI定时方式2
    TH1=TL1=0xf4;       //2400b/s
    PCON=0;             //波特率不加倍
    SCON=0x50;          //串口方式1，TI和RI清零，允许接受
    TR1=1;              //启动TI
    while(1){ 
        while(RI==1){           //等待接收完成
            RI = 0;             //清RI标志位
            receive = SBUF;     //取得接收值
            SBUF = receive;       //结果返送主机
            while(TI==0);         //等待发送结束
            TI = 0;             //清TI标志位
            P2 = map[receive];  //显示接收值
        }
    }
}