51单片机 简易16键电子琴代码+仿真

#include <reg51.h> #define uchar unsigned char #define uint unsigned int uchar leddata[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0x88,0xf6,0xff}; //数码管段码数组 uchar PLACE_CODE[]={0xfe,0xfd,0xfb,0xf7}; //数码管位选数组 uchar LEDBuf[]={11,11,11,11}; //数据显示缓冲区 uchar timerCnt,sec,min,state=0; void main() { Timer1Init(); Timer0Init(); EX0_Init(); EX1_Init(); //函数调用 EA=1; //打开总开关 while(1) { switch(state) { case 0:TR0=1;showNormal();break;//正常时钟状态 case 1:showSec();break;//调秒 case 2:showMin();break;//调分 default:break; } } } void Display() { uchar i; switch(i) { case 0: P0=0xff; P0=leddata[LEDBuf[0]];//送段码 P2=PLACE_CODE[0]; //送位选 i++; break; case 1: P0=0xff; P0=leddata[LEDBuf[1]];//送段码 P2=PLACE_CODE[1]; //送位选 i++; break; case 2: P0=0xff; P0=leddata[LEDBuf[2]];//送段码 P2=PLACE_CODE[2]; //送位选 i++; break; case 3: P0=0xff; P0=leddata[LEDBuf[3]];//送段码 P2=PLACE_CODE[3]; //送位选 i=0; break; default:break; } } void timer0_ISR(void) interrupt 1 //中断服务函数产生秒分 { timerCnt++; if(timerCnt>=20) //20次50ms中断 { timerCnt=0; sec++; if(sec>=60) { sec=0; min++; if(min>=60) { min=0; } } } TL0 = 0xB0; //设置定时初值 TH0 = 0x3C; //设置定时初值 } void Timer0Init(void) //50毫秒@12.000MHz { TMOD &= 0xF0; //设置定时器模式 TMOD |= 0x01; //设置定时器模式 TL0 = 0xB0; //设置定时初值 TH0 = 0x3C; //设置定时初值 TF0 = 0; //清除TF0标志 ET0=1; //打开中断 } void timer1_ISR(void) interrupt 3 //实现数码管的动态刷新 { TR1=0; Display(); TL1 = 0x18; //设置定时初值 TH1 = 0xFC; //设置定时初值 TR1=1; } void Timer1Init(void) //1毫秒@12.000MHz { TMOD &= 0x0F; //设置定时器模式 TMOD |= 0x10; //设置定时器模式 TL1 = 0x18; //设置定时初值 TH1 = 0xFC; //设置定时初值 TF1 = 0; //清除TF1标志 ET1=1; //打开中断 EA=1; //打开总开关 TR1 = 1; //定时器1开始计时 } void EX0_ISR() interrupt 0 //对状态变量state进行处理 { TR0=0; state++; if(state>2) state=0; } void EX0_Init() { IT0=1; EX0=1; } void EX1_ISR() interrupt 2 //调节秒和分钟 { TR0=0; switch(state) { case 0:break; case 1:sec++;if(sec>=60)sec=0;break; case 2:min++;if(min>=60)min=0;break; default:break; } } void EX1_Init() { IT1=1; EX1=1; } void showNormal() { LEDBuf[3]=min/10; LEDBuf[2]=min%10; LEDBuf[1]=sec/10; LEDBuf[0]=sec%10; } void showSec() { LEDBuf[3]=12; LEDBuf[2]=12; LEDBuf[1]=sec/10; LEDBuf[0]=sec%10; } void showMin() { LEDBuf[3]=min/10; LEDBuf[2]=min%10; LEDBuf[1]=12; LEDBuf[0]=12; }