51单片机入门（五）

用LCD1602来显示一个二十四小时的时钟和以0.1秒计时的秒表

1.时钟代码：

//use Lcd1602 to make a clock #include<reg52.h>#define uchar unsigned charsbit K1=P3^1; //select hour /minute /secondsbit K2=P3^0; //add onesbit K3=P3^2; //into clock configurationsbit E=P2^7;sbit RW=P2^5;sbit RS=P2^6;uchar setplace;uchar time;//************declare functionvoid delayms(uchar);void LcdInit();void LcdWriteCom(uchar);void LcdWriteData(uchar);void TimerConfig();void Int0Config();//************main()void main(){ uchar hour=12,minute=0,second=0; LcdInit(); TimerConfig(); Int0Config();

LcdWriteData('0'+hour/10); LcdWriteData('0'+hour); LcdWriteData('-'); LcdWriteData('0'+minute/10); LcdWriteData('0'+minute); LcdWriteData('-'); LcdWriteData('0'+second/10); LcdWriteData('0'+second); while(1) { if(TR0==0) { if(K1==0) { delayms(10); if(K1==0) { setplace++; if(setplace>=3) setplace=0; } while(~K1); } if(K2==0) { delayms(10); if(K2==0) { if(setplace==0) { second++; if(second>=60) second=0; }else if(setplace==1) { minute++; if(minute>=60) minute=0; }else hour++; if(hour>=24) hour=0; } while(~K2); } } //timer add one if(time==20) { time=0; second++; if(second==60) { second=0; minute++; if(minute==60) { minute=0; hour++; if(hour==24) hour=0; } }

} //show time on the lcd1602 LcdWriteCom(0x80); LcdWriteData('0'+hour/10); LcdWriteData('0'+hour); LcdWriteCom(0x83); LcdWriteData('0'+minute/10); LcdWriteData('0'+minute); LcdWriteCom(0x86); LcdWriteData('0'+second/10); LcdWriteData('0'+second); }

}//*************delayms(uchar)void delayms(uchar z){ uchar x,y; for(x=z;x>0;x--) for(y=110;y>0;y--);}//************LcdInit()void LcdInit(){ LcdWriteCom(0x38); LcdWriteCom(0x0c); LcdWriteCom(0x06); LcdWriteCom(0x01); LcdWriteCom(0x80);}//****************LcdWriteCom(uchar)void LcdWriteCom(uchar com){ RW=0; RS=0; P0=com; delayms(1); E=1; delayms(5); E=0;}//***************LcdWriteData(uchar)void LcdWriteData(uchar dat){ RW=0; RS=1; P0=dat; delayms(1); E=1; delayms(5); E=0;}//******************TimerConfig()void TimerConfig(){ TMOD=0x01; TH0=(65535-49539)/256; TL0=(65535-49539)%6; EA=1; ET0=1; TR0=1;}//**************Timer servicevoid Timer() interrupt 1{ TH0=(65535-49539)/256; TL0=(65535-49539)%6; time++; //add one per 50ms}//****************Int0Config()void Int0Config(){ EA=1; EX0=1; IT0=1;}//***************Int0 servicevoid Int0() interrupt 0{ delayms(10); if(K3==0) { TR0=~TR0; //timer not count time setplace=0; }}

效果图：

2.秒表代码：

//use timer to make a counter (add one per 0.1s)#include<reg52.h>#define uchar unsigned charsbit K3=P3^2;sbit K4=P3^3;sbit E=P2^7;sbit RS=P2^6;sbit RW=P2^5;uchar time;uchar setplace;//************************declare functionvoid delayms(uchar);void TimerConfig();void LcdInit();void LcdWriteCom(uchar);void LcdWriteData(uchar);void Int0Config();//********main()void main(){ uchar hour=0,minute=0,second=0,tenth=0; LcdInit(); TimerConfig(); Int0Config(); LcdWriteData('0'+hour/10); LcdWriteData('0'+hour); LcdWriteData('-'); LcdWriteData('0'+minute/10); LcdWriteData('0'+minute); LcdWriteData('-'); LcdWriteData('0'+second/10); LcdWriteData('0'+second); LcdWriteData('.'); LcdWriteData('0'+tenth);

while(1) { //timer add one if(time==2) { time=0; tenth++; if(tenth==10) { second++; tenth=0; if(second==60) { second=0; minute++; if(minute==60) { hour++; minute=0; if(hour==99) { hour=0; } } } } } //show outcom on the Lcd LcdWriteCom(0x80); LcdWriteData('0'+hour/10); LcdWriteData('0'+hour); LcdWriteCom(0x83); LcdWriteData('0'+minute/10); LcdWriteData('0'+minute); LcdWriteCom(0x86); LcdWriteData('0'+second/10); LcdWriteData('0'+second); LcdWriteCom(0x89); LcdWriteData('0'+tenth);

}}//************delayms(uchar)void delayms(uchar z){ uchar x,y; for(x=z;x>0;x--) for(y=110;y>0;y--);}//***************TimerConfig()void TimerConfig(){ TMOD=0x01; TH0=(65535-49539)/256; TL0=(65535-49539)%6; EA=1; ET0=1; TR0=1;}//**************Timer servicevoid Timer() interrupt 1{ TH0=(65535-49539)/256; TL0=(65535-49539)%6; time++;}//********LcdInit()void LcdInit(){ LcdWriteCom(0x38); LcdWriteCom(0x0c); LcdWriteCom(0x06); LcdWriteCom(0x01); LcdWriteCom(0x80);}//*********LcdWriteCom(uchar)void LcdWriteCom(uchar com){ RW=0; RS=0; P0=com; delayms(1); E=1; delayms(5); E=0;}//*************LcdWriteData(uchar)void LcdWriteData(uchar dat){ RW=0; RS=1; P0=dat; delayms(1); E=1; delayms(5); E=0;}//****************Int0Config()void Int0Config(){ EA=1; EX0=1; IT0=1;}//***************Int0 servicevoid Int0() interrupt 0{ delayms(10); if(K3==0) { TR0=~TR0; //timer not count time setplace=0; }}

效果图：

转载于:https://www.cnblogs.com/ljd4you/p/6657719.html

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