《姬家寨牌激光弦蓝牙古筝》腾讯视频网：

https://v.qq.com/x/page/o0329mczpxi.html?spm=a2h0k.11417342.soresults.dposter&__t=1&ptag=1.qzone&_out=101

//《姬家寨牌激光弦蓝牙古筝》

// 硬件设计：姬学瑞;    软件编程：姬学瑞;

// 版权所有; 侵权必究！姬家寨村电子科技研究所研制！

#include<reg51.h>

unsigned char a=0x00,b=0x00,c=0x00,t=0;     

void UsartConfiguration();

void UsartSend(unsigned char c)

{

            SBUF=c;

            while(!TI); //等待发送数据完成

            TI=0;

}

void main()

{         

     P1=P2=P3=0XFF;

         UsartConfiguration();

         while(1)

         {

             t=a^P1;//xor

        t=t&(~a);   //and

        a=P1;

         // t=P1;

        if(t&0x01)UsartSend(0x01);

        if(t&0x02)UsartSend(0x02);

        if(t&0x04)UsartSend(0x03);

        if(t&0x08)UsartSend(0x04);

        if(t&0x10)UsartSend(0x05);

        if(t&0x20)UsartSend(0x06);

        if(t&0x40)UsartSend(0x07);

        if(t&0x80)UsartSend(0x08);

        t=b^P2;// xor

        t=t&(~b); //and

        b=P2;

        if(t&0x01)UsartSend(0x09);

        if(t&0x02)UsartSend(0x10);

        if(t&0x04)UsartSend(0x11);

        if(t&0x08)UsartSend(0x12);

        if(t&0x10)UsartSend(0x13);

        if(t&0x20)UsartSend(0x14);

        if(t&0x40)UsartSend(0x15);

        if(t&0x80)UsartSend(0x16);

        t=c^P3;    //xor

        t=t&(~c);   //and

        c=P3;

        if(t&0x08)UsartSend(0x17);

        if(t&0x10)UsartSend(0x18);

        if(t&0x20)UsartSend(0x19);

        if(t&0x40)UsartSend(0x20);

        if(t&0x80)UsartSend(0x21);

         }

}

/*******************************************************************************

* 函数名         :UsartConfiguration()

* 函数功能      :设置串口

* 输入           : 无

* 输出            : 无

*******************************************************************************/

void UsartConfiguration()

{

         SCON=0X50;                       //设置为工作方式1

         TMOD=0X20;                     //设置计数器工作方式2

         PCON=0X80;                       //波特率加倍

         TH1=0Xbf;                           //计数器初始值设置，这里波特率是2400的 30m晶体震荡

         TL1=0Xbf;

         ES=1;                                    //打开接收中断

         EA=1;                                    //打开总中断

         TR1=1;                                 //打开计数器

}