下面是頻率計的電路圖 采用的是51單片機
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以下是程序源代碼：
#include <reg52.h>
#define value P2
#define place P0
unsigned char d[4];
usigned char Num[10]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};
sbit addrC=P1^0;
sbit addrB=P1^1;
sbit addrA=P1^2;
sbit clear=P1^3;
sbit ledG=P1^4;
sbit ledY=P1^5;
sbit ledR=P1^6;
unsigned char count;
unsigned char gears;
unsigned int tN;
unsigned int fCnt;
unsigned long regCnt;
unsigned int pCnt;
void Delay( unsigned int DelayTime)
{
while(DelayTime--);
}
void display()
{
if(gears==1)
{
d[3]=0;
d[2]=pCnt/100;
d[1]=(pCnt%100)/10;
d[0]=pCnt% 10;
place=0xfe;value=Num[d[3]];Delay(300);
place=0xfd;value=Num[d[2]];Delay(300);
place=0xfb;value=Num[d[1]];Delay(300);
place=0xf7;value=Num[d[0]];Delay(300);
ledG=1;
ledY=1;
ledR=0;
}
else if(gears==2)
{
d[3]=pCnt/1000;
d[2]=(pCnt%1000 )/100;
d[1]=(pCnt%100)/10;
d[0]=pCnt%10;
place=0xfe;value=Num[d[3]];Delay(300);
place=0xfd;value=Num[d[2]];Delay(300);
place=0xfb;value=Num[d[1]]+0x80;Delay(300);
place=0xf7;value=Num[d[0]];Delay(300);
ledG=1;
ledY=0;
ledR=1;
}
else if(gears==3)
{
d[3]=pCnt/1000;
d[2]=(pCnt%1000)/100;
d[1]=(pCnt%100)/10;
d[0]=pCnt% 10;
place=0xfe;value=Num[d[3]]+0x80;Delay(300);
place=0xfd;value=Num[d[2]];Delay(300);
place=0xfb;value=Num[d[1]];Delay(300);
place=0xf7;value=Num[d[0]];Delay(300);
ledG=0;
ledY=1;
ledR=1;
}
else if(gears==4)
{
d[3]=0;
d[2]=0;
d[1]=0;
d[0]=0;
place=0xfe;value=Num[d[3]];Delay(300);
place=0xfd;value=Num[d[2]];Delay(300);
place=0xfb;value=Num[d[1]];Delay(300);
place=0xf7;value=Num[d[0]];Delay(300);
ledG=0;
ledY=0;
ledR=0;
}
}
void intialize()
{
clear=1;
addrB=0;
addrC=0;
addrA=0;
gears=1;
ledG=1;
ledY=1;
ledR=0;
TMOD=0X61;
ET0=1;
TR0=1;
TH0=0x3c;
TL0=0xb0 ;
tN=20;
ET1=1;
TR1=1;
TH1=0xff;
TL1=0xff;
EA=1;
}
void main()
{
intialize();
while(1)
{
display();
}
}
void timer0() interrupt 1
{
count++;
if(count==tN)
{
ET1=0 ;
TR1=0;
regCnt=fCnt;
fCnt =0;
count=0;
clear=0;
clear=1;
if(gears==1)
{
if(regCnt<1000)
{
pCnt=regCnt;
}
else
{
gears=2;
addrA=1;
TH1=0xec;
TL1=0xec;
}
}
else if(gear==2 )
{
regCnt=regCnt*10*20/100;
if(regCnt<10000)
{
pCnt=regCnt;
}
else
{
gears=3;
TH1=0xce;
TL1=0xce;
}
}
else if(gears==3)
{
regCnt=regCnt*10*50/1000;
if(regCnt<2500)
{
pCnt=regCnt;
}
else
{
gears=4;
}
}
ET1=1;
TR1=1;
}
TH0=0x3c;
//(65536-50000)/256
TL0=0xb0;
//(65536-50000)%256
}
void tally1() interrupt 3
{
fCnt++;
}