51單片機時鐘秒表課程設計

void Delayms(int ms)

{

while(ms)

{

unsigned char i;

ms--;

for (i=0; i<240; i++);

}

}

void display()

{

char v,c;

P3=0x11;

v=Leds[Ledc];

c=LEDTAB[v & 0x0f];

if (v&0x10) c|=0x80;

P2=c;

P3=Ledc;

Ledc++;

if (Ledc>=8) Ledc=0;

}

void readkey() //讀按鍵

{

if(start==0) isStart = 1; //真為開始

if(stop==0) isStart = 0; //假為停止

if(key0 == 0) num_count = stu_num0; //選擇曾路榮

if(key1 == 0) num_count = stu_num1;//選擇張洪榮

if(key2 == 0) num_count = stu_num2;

if(key3 == 0) num_count = stu_num3;

if(key4 == 0) num_count = stu_num4;

if(key5 == 0) num_count = stu_num5;

}

void t0int() interrupt 1 //1ms定時器中斷服務函數

{

TH0=(-1000)>>8;

TL0=-1000;

display();

readkey();

T1msc++;

if (isStart) //開始倒計時

{

if ((T1msc%100)==0) //滿 0.1秒

{

temp--;

if(temp==-1)

{

num_count--;

temp = 10; //0.1秒恢復9

}

}

if(num_count == -1) //

{

num_count = 99;

num--;

if(num == -1) num = 99;

}

}

if (T1msc>=1000)

{

T1msc=0;

}

}

void NumToLeds()

{

Leds[1]=num/10%10;

Leds[2]=num%10;

Leds[3]=num_count/10%10;

Leds[4]=num_count%10+0x10;

Leds[5]=temp; //0.1秒顯示

}

void main()

{

Delayms(10);

TMOD=0x01;

TR0=1;

ET0=1;

EA=1;

while(1)

{

NumToLeds(); //送數據

}

}