百米计时器LCD1602显示

#include

#define uchar unsigned char

#define uint unsigned int

sbit k1=P3^0;

sbit k2=P3^1;

sbit k3=P3^2;

sbit k4=P3^3;

sbit k5=P3^4;

sbit k6=P3^5;

sbit k7=P3^6;

sbit k8=P3^7;

sbit rs=P2^6;

sbit rw=P2^5;

sbit en=P2^7;

uchar count;

uint tim;

void usdelay()

{

_nop_();_nop_();

_nop_();_nop_();

_nop_();_nop_();

}

void delayms(uint z)

{

uint x,y;

for(x=z;x>0;x--)

for(y=110;y>0;y--);

}

void write_com(uchar com)

{

rw=0;

rs=0;

en=0;

P0=com;

delayms(2);

en=1;

delayms(2);

en=0;

delayms(2);

}

void write_dat(uchar dat)

{

rw=0;

rs=1;

en=0;

P0=dat;

delayms(2);

en=1;

delayms(2);

en=0;

delayms(2);

}

void write_zfc(uchar *p)

{

while(*p!=0)

write_dat(*p++);

}

void init_1602()

{

write_com(0x38);

write_com(0x0c);

write_com(0x06);

write_com(0x01);

write_com(0x80+1);

write_zfc("sec : .");

write_com(0x80+12);

write_dat(S);

write_com(0x80+0x40+1);

write_zfc("the last:");

}

void display()

{

uchar wan,qian,bai,shi,ge;

wan=tim/10000;

qian=(tim-wan*10000)/1000;

bai=(tim-wan*10000-qian*1000)/100;

shi=(tim-wan*10000-qian*1000-bai*100)/10;

ge=tim;

write_com(0x80+6);

write_dat(0x30+bai);

write_dat(0x30+shi);

write_com(0x80+9);

write_dat(0x30+ge);

}

void display111()

{

uchar wan,qian,bai,shi,ge;

wan=tim/10000;

qian=(tim-wan*10000)/1000;

bai=(tim-wan*10000-qian*1000)/100;

shi=(tim-wan*10000-qian*1000-bai*100)/10;

ge=tim;

write_com(0x80+0x40+10);

write_dat(0x30+bai);

write_dat(0x30+shi);

write_com(0x80+0x40+12);

write_dat(.);

write_com(0x80+0x40+13);

write_dat(0x30+ge);

}

void main()

{

init_1602();

TMOD=0x01;

TH0=(65536-50000)/256;

TL0=(65536-50000)%6;

EA=1;

ET0=1;

TR0=1;

display();

while(1)

{

if(k3==0)

display111();

if(k7==0)

{

delayms(50);

TR0=~TR0;

}

if(count==2)

{

count=0;

tim++;

}

display();

}

}

void timer0() interrupt 1

{

TH0=(65536-50000)/256;

TL0=(65536-50000)%6;

count++;

}