- /* 名称:单片机与PC通信
- 说明:单片机可接收PC发送的数字字符,按下单片机的K1键后,单片机可向PC发送字符串。在Proteus环境下完成本实验时,需要安装Virtual Serial Port Driver和串口调试助手。本例缓冲100个数字字符,缓冲满后新数字从前面开始存放(环形缓冲)。
- */
- #include<reg51.h>
- #define uchar unsigned char
- #define uint unsigned int
- uchar Receive_Buffer[101]; //接收缓冲
- uchar Buf_Index=0; //缓冲空间索引
- //数码管编码
- uchar code DSY_CODE[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x00};
- //延时
- void DelayMS(uint ms)
- {
- uchar i;
- while(ms--) for(i=0;i<120;i++);
- }
- //主程序
- void main()
- {
- uchar i;
- P0=0x00;
- Receive_Buffer[0]=-1;
- SCON=0x50; //串口模式1,允许接收
- TMOD=0x20; //T1工作模式2
- TH1=0xfd; //波特率9600
- TL1=0xfd;
- PCON=0x00; //波特率不倍增
- EA=1;EX0=1;IT0=1;
- ES=1;IP=0x01;
- TR1=1;
- while(1)
- {
- for(i=0;i<100;i++)
- { //收到-1为一次显示结束
- if(Receive_Buffer[ i]==-1) break;
- P0=DSY_CODE[Receive_Buffer[ i]];
- DelayMS(200);
- }
- DelayMS(200);
- }
- }
- //串口接收中断函数
- void Serial_INT() interrupt 4
- {
- uchar c;
- if(RI==0) return;
- ES=0; //关闭串口中断
- RI=0; //清接收中断标志
- c=SBUF;
- if(c>='0'&&c<='9')
- { //缓存新接收的每个字符,并在其后放-1为结束标志
- Receive_Buffer[Buf_Index]=c-'0';
- Receive_Buffer[Buf_Index+1]=-1;
- Buf_Index=(Buf_Index+1)%100;
- }
- ES=1;
- }
- void EX_INT0() interrupt 0 //外部中断0
- {
- uchar *s="这是由8051发送的字符串!\r\n";
- uchar i=0;
- while(s[i]!='\0')
- {
- SBUF=s[i];
- while(TI==0);
- TI=0;
- i++;
- }
- }
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