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#include <reg51.h>
sbit key0=P1^0;
sbit key1=P1^1; //定義key0，key1接口
unsigned char flag,con,mcount; //flag為計(jì)數(shù)到一秒時(shí)給時(shí)鐘發(fā)的信號(hào)
unsigned char count = 0;
unsigned char seccount =0; //作為時(shí)鐘的秒的計(jì)量單位
unsigned char hour = 0; //時(shí)鐘的時(shí)
unsigned char min = 0; //時(shí)鐘的分
unsigned char sec = 0; //時(shí)鐘的秒
unsigned char keypress0,keypress1,mode,ms,s,ss,start;
unsigned char
Displaynum[]={0x14,0xd7,0x4c,0x45,0x87,0x25,0x24,0x57,0x04,0x05, 0x10,0xd3,0x48,0x41,0x83,0x21,0x20,0x53,0x00,0x01,0xff,0xfb};
//數(shù)碼管十六進(jìn)制譯碼表
unsigned char controlnum[]={0x08,0x04,0x02,0x01}; //控制四個(gè)數(shù)碼管顯示
unsigned char DisplayBuff[]={0x00, 0x00, 0x00, 0x00}; //每個(gè)數(shù)碼管的值
void display_state(); //數(shù)碼管顯示子程序
void keyscan(); //鍵盤掃描子程序
void timer(); //秒表子程序
unsigned char count1,flag1,t_adjust=0,tm_adjust=0;
unsigned char bKey0Pressed = 0, bKey1Pressed = 0;
unsigned char ucStatus = 0;
void main()
{
TMOD = 0x01; //定時(shí)器0工作在模式1，GATE=0，C/t=0,16位模
TH0= (2^16-5000)/256;//定時(shí)器0 預(yù)存值，
TL0= (2^16-5000)%256;
TR0= 1; //定時(shí)器0 啟動(dòng)
ET0= 1; //定時(shí)器中斷0 允許
EA= 1; //開中斷
IT0=1; //外部中斷0下降沿觸發(fā)
IT1=1; //外部中斷1 下降沿觸發(fā)
EX0=1; //外部中斷0允許
EX1=1; //外部中斷1允許
PX1=1; //外部中斷1 為高優(yōu)先級(jí)中斷
while(1) //死循環(huán)，
{
if(flag == 1) //時(shí)鐘顯示
{
flag = 0;
sec++;
if(sec ==60)
{sec = 0;
min++;
if(min ==60)
{min = 0;
hour ++;
if(hour == 24)
{
hour = 0;
}
}
}
}
display_state();
keyscan();
timer();
}
}
//////////////////////////////////ISR中斷服務(wù)程序，每5ms產(chǎn)生一個(gè)定時(shí)器0 中斷
void Display() interrupt 1
{
TH0 = (2^16-5000)/256;
TL0 = (2^16-5000)%256;
seccount ++;
mcount ++;
keypress0++;
keypress1++;
P2=0x00; //P2口先清零
P0 = Displaynum[DisplayBuff[count]]; //P0口輸出
P2 = controlnum[count]; //P2口輸出
count++;
if(count==4)
count=0;
if(seccount == 200) //200*5ms=1s
{ seccount =0;
flag =1; //每過1秒給時(shí)鐘信號(hào)加一秒
}
}
///////////////////////////////////////////
void display_state()
{
if(mode == 0) //時(shí)鐘模式，顯示時(shí)間
{
DisplayBuff[0] = hour/10;
DisplayBuff[1] = (hour%10)+10; //"+10"是為了顯示加點(diǎn)的數(shù)字
DisplayBuff[2] = min/10;
DisplayBuff[3] = min%10;
}
if(mode == 1) //秒表模式，顯示秒表
{
DisplayBuff[0] = ss +10; //"+10"是為了顯示加點(diǎn)的數(shù)字
DisplayBuff[1] = s/10;
DisplayBuff[2] = (s%10)+10;
DisplayBuff[3] = ms;
}
if(mode == 2) // 計(jì)數(shù)器模式，顯示計(jì)數(shù)
{
DisplayBuff[0] = count1/1000; //千位
DisplayBuff[1] = (count1-(count1/1000)*1000)/100; //百位
DisplayBuff[2] = (count1-(count1/100)*100)/10; //十位
DisplayBuff[3] = count1%10; //個(gè)位
}
if(mode==3) //顯示時(shí)鐘的秒，
{
DisplayBuff[0] = 20; //第一位不顯示
DisplayBuff[1] = 21; //第二位顯示一個(gè)點(diǎn)
DisplayBuff[2] = sec/10;//顯示秒的十位
DisplayBuff[3] = sec%10;//顯示秒的個(gè)位
}
}
//**************//
//鍵盤掃描子程序//
//**************//
void keyscan()
{
if(!key0 && bKey0Pressed == 0) //檢測到key0按下
{
keypress0 = 0;
bKey0Pressed = 1; //防止重入此判斷
while(!key0); //如果沒放開，就等下去
}
if(key0 && bKey0Pressed == 1) //檢測到key0放開
{
bKey0Pressed = 0; //防止重入此判斷
if (keypress0<120) //如果是短按
{
if(ucStatus == 0x02)
{
ucStatus = 0x00;
mode = 0; //時(shí)鐘模式
t_adjust=0;
}
else if(ucStatus == 0x00)
{
ucStatus = 0x01;
mode = 1; //秒表模式
}
else if(ucStatus == 0x01)
{
ucStatus = 0x02;
mode = 2; //計(jì)數(shù)模式
}
}
else if(keypress0>200) //如果是長按
mode=3; //顯示時(shí)鐘的秒的模式
}
////////////////////////////////
if(mode == 0) //進(jìn)入時(shí)鐘模式后
{
if(!key1 && (bKey1Pressed == 0))
{ keypress1 = 0;
bKey1Pressed = 1;
while(!key1);
}
if(key1 && (bKey1Pressed == 1))
{
bKey1Pressed = 0;
if(keypress1 >= 200) //如果是長按
{
t_adjust++;
if(t_adjust==3)
t_adjust=0;
}
else if(keypress1 < 120)
switch (t_adjust)
{
case 1:{ //調(diào)整分
min++;
sec = 0;
if(min == 60)
min = 0;
}
break;
case 2: { //調(diào)整時(shí)
hour ++ ;
sec = 0;
if(hour == 24)
hour = 0;
}
break;
default:break;
}
}
}
else if(mode == 1) //進(jìn)入秒表模式
{
if(!key1 && bKey1Pressed == 0)
{
keypress1 = 0;
bKey1Pressed = 1;
while(!key1);
}
if(key1 && bKey1Pressed == 1)
{
bKey1Pressed = 0;
if(keypress1 < 120) //短按
{
if(flag1==0) { start=2;flag1=1;} //start=2代表秒表開始計(jì)時(shí)
else {start=0;flag1=0;} //start=0，秒表停止計(jì)時(shí)
}
else if(keypress1>200) //長按
start=1; //秒表清零
}
}
}
void timer() //秒表子程序
{
if(mode==1) //進(jìn)入秒表模式才執(zhí)行
{
if(start==1) //清零
{
ms = 0;
s = 0;
ss = 0;
mcount=0;
}
if(start==2) //秒表開始計(jì)時(shí)
{
if(mcount==20) //20*5ms=0.1s
{
mcount=0;
ms++;
if(ms == 10) // 10*0.1s=1s，s++
{ms = 0;
s ++;
if(s == 100) //100s
{s = 0;
ss ++;
if(ss == 10)
{ss = 0;
s = 0;
ms = 0;
}
}
}
}
}
if (start==0);//秒表停止
}
}
//////////////////////
void it0(void) interrupt 0 using 1 //外部中斷0 服務(wù)程序
{
if(mode==2) //只有在計(jì)數(shù)模式才執(zhí)行
{
count1++; //每響應(yīng)一次，計(jì)數(shù)加一
if(count1==10000) //超出四位時(shí)，不能再加
count1 =9999;
}
}
void it2(void) interrupt 2 using 2 //外部中斷0 服務(wù)程序
{
if(mode==2) //只有在計(jì)數(shù)模式才執(zhí)行
{
if(count1!=0)
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