51單片機頻率計程序(4位不帶小數點(diǎn))

#include AT89X51.H>
#include stdio.h>
int value=0,n=0;
int n,n1,n2,n3,n4;
int LEDData [] = { 0xC0, //"0"
0xF9, //"1"
0xA4, //"2"
0xB0, //"3"
0x99, //"4"
0x92, //"5"
0x82, //"6"
0xF8, //"7"
0x80, //"8"
0x90, //"9"
};
void delay(short i);
void initial(void);
void display(void);

//******************************************************
main ()
{
initial();
while(1)
{
if(n==100)
{
display();
n=0;
value=0;
}
}

}

//**********************************************************
void initial(void)//定時(shí)器計數器初始化
{
IE=0x8b;
TCON=0x01;
TMOD=0x11;
TH0=0xD8;//T0作為定時(shí)器初始化0.01秒中一次斷
TL0=0xF0;
TH1=0XFF;//T1產(chǎn)生625HZ
TL1=0X60;
TR0=1;
TR1=1;
}

//***********************************************************
void delay(short i)
{
int j=0;
int k=0;
k=i*2;
while(jk) j++;

}

//**************************************************************
void extern0_ISR () interrupt 0 //INT0外部脈沖中斷
{
EX0=0;
value++;
EX0=1;
}

//************************************************************
void timer0_ISR () interrupt 1 //定時(shí)器每0.01秒中斷一次T0
{
n++;
TH0=0xD8;
TL0=0xF0;

}

//**********************************************************
void timer1_ISR () interrupt 3//T1625hz
{
P1=P1^0xc0;
TH1=0XFF;//T1產(chǎn)生3125HZ
TL1=0X60;
}

//*************************************************
void display(void)
{

n4=value/1000;
n3=(value-n4*1000)/100;
n2=(value-n4*1000-100*n3)/10;
n1=value-n4*1000-100*n3-10*n2;
while(1)
{
P2=0x3f;
P0=LEDData [n1];
delay(50);
P2=0x5f;
P0=LEDData [n2];
delay(50);
P2=0x6f;
P0=LEDData [n3];
delay(50);
P2=0xf7;
P0=LEDData [n4];
delay(50);
P2=0xff;
}
}