高手帮忙51c单片机——想制作倒计时报警器，求个c程序

刚写的程序，可以通过S0（功能键）,S1（加键）,S2（减键）设定初值，倒数为00-00-00时蜂鸣器响，通过八位LED显示；

#include<reg52h>

#include<intrinsh>

#define uchar unsigned char

#define uint unsigned int

uchar code wei[]={0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f};//八位位选码表

uchar code duan[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90};//段选码表

sbit s0=P3^3; //设置功能键

sbit s1=P3^5; //设置‘加’键

sbit s2=P3^6; //设置‘减’键

sbit beep=P3^7; //设置蜂鸣器

void delay(uint z);

void display();

void init();

void keyscan();

uchar shi,fen,miao,nam;

void main()

{

init();

while(1)

{

display();

keyscan();

beep=1;

if (miao==0&&fen==0&&shi==0)//当倒数计时为00-00-00时蜂鸣器响

{

beep=0;

TR0=0;

}

}

}

void delay(uint z)

{

uint i,j;

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

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

}

void display() //我这里P2为位选，P0为段选，显示格式为 时-分-秒

{

uchar s,g;

s=shi/10;

g=shi%10;

P2=wei[7];

P0=duan[s];

delay(1);

P2=wei[6];

P0=duan[g];

delay(1);

P2=wei[5];

P0=0xbf;

delay(1);

s=fen/10;

g=fen%10;

P2=wei[4];

P0=duan[s];

delay(1);

P2=wei[3];

P0=duan[g];

delay(1);

P2=wei[2];

P0=0xbf;

delay(1);

s=miao/10;

g=miao%10;

P2=wei[1];

P0=duan[s];

delay(1);

P2=wei[0];

P0=duan[g];

delay(1);

}

void init()

{

miao=10; //设定初值为 00-01-10

fen=1;

shi=0;

EA=1;

ET0=1;

TMOD=0X01;

TH0=(65536-50000)/256;

TL0=(65536-50000)%256;

TR0=1;

}

void timer() interrupt 1

{

TH0=(65536-50000)/256;

TL0=(65536-50000)%256;

nam++;

if (nam==20)

{

nam=0;

if (miao==0)

{

miao=60;

if (fen==0)

{

fen=60;

if (shi==0)

shi=24;

shi--;

}

fen--;

}

miao--;

}

}

void keyscan()

{

uchar key,num;

if (s0==0)

{

delay(5);

if (s0==0)

{

key++;

if (key==4)

key=0;

}

while(!s0)

display();

}

if (s1==0)

{

delay(5);

if (s1==0)

{

num=1;

}

while(!s1)

display();

}

if (s2==0)

{

delay(5);

if (s2==0)

{

num=2;

}

while(!s2)

display();

}

switch(key)

{

case 0:TR0=1;break;

case 1:TR0=0;

if (num==1)

{

num=0;

miao++;

if (miao>=60)

miao=0;

display();

}

if (num==2)

{

num=0;

if (miao==0)

miao=60;

miao--;

display();

}

break;

case 2:

if (num==1)

{

num=0;

fen++;

if (fen>=60)

fen=0;

display();

}

if (num==2)

{

num=0;

if (fen==0)

fen=60;

fen--;

display();

}

break;

case 3:

if (num==1)

{

num=0;

shi++;

if (shi>=24)

shi=0;

display();

}

if (num==2)

{

num=0;

if (shi==0)

shi=24;

shi--;

display();

}

break;

}

}

参考程序：

#include <reg52h>

sbit Beep = P3^0;

unsigned char t1s,t50ms;

unsigned char flag30s = 0,flag1s = 0;

void delayms(unsigned int xms)

{

unsigned int i,j;

for(i=0; i<xms; i++)

for(j=0; j<110; j++);

}

void Alarm(void)

{

Beep = 0;

delayms(200);

Beep = 1;

}

void main()

{

TMOD = 0x01;

TH0 = 0x3C;

TL0 = 0xB0;//50ms中断一次

EA = 1;

ET0 = 1;

TR0 = 1;

while(1)

{

if(flag30s)Beep = 0;//30s到蜂鸣器一直响

if(flag1s)//1s到，蜂鸣器响一下

{

flag1s = 0;

Alarm();

}

}

}

void TIM0(void) interrupt 1

{

TH0 = 0x3C;

TL0 = 0xB0;

t50ms++;

if(t50ms == 20)//1s

{

t50ms = 0;

t1s++;

flag1s = 1;

if(t1s == 30)//30s

{

TR0 = 0;

flag30s = 1;

}

}

}

void main()

{

green=0;

red=1;

while(1)

{

if(K==0)

{

delay(1000); //延时约12ms

if(K==0)

{

green=1;

red=0;

beep=0;

delay(40000); //延时约05s

red=1;

beep=1;

}

}

else

{

green=!green;

delay(20000);//延时约025s

}

}

}

或者将delay(40000) 换成while(k==0);//等待按键抬起

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