#include "STC12C5A60S2.h"
//#include <reg52.h>
#define Segment P0
#define sl P2
sbit clear=P1^3;
sbit fp2=P1^2; //定义数据端口地址，0时分频处理，1时不分频
unsigned char count; //定时 1s 计数
unsigned char d[4]; //对应数码管的各位
unsigned char dangwei; //档位
unsigned int timeN; //不同档位计时值
unsigned int fCount; //脉冲下降沿次数
unsigned int regCount; //脉冲次数暂存
unsigned int pCount; //频率显示
unsigned char Num[10]={0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90};
//七段数码管代码共阳极
void Delay(unsigned int DelayTime)
{
while(DelayTime--);
}
void dispbuf()
{
{
if(dangwei==0) //档位
{
d[3]=0;
d[2]=(pCount/100)%10;
d[1]=(pCount/10)%10;
d[0]=pCount%10;
sl=0x01;Delay(1);Segment=Num[d[3]];Delay(200);
sl=0x02;Delay(1);Segment=Num[d[2]];Delay(200);
sl=0x04;Delay(1);Segment=Num[d[1]];Delay(200);
sl=0x08;Delay(1);Segment=Num[d[0]];Delay(200);
}
else if(dangwei==1)
{
d[3]=pCount/1000;
d[2]=(pCount/100)%10;
d[1]=(pCount/10)%10;
d[0]=pCount%1;
sl=0x01;Delay(1);Segment=Num[d[3]];Delay(200);
sl=0x02;Delay(1);Segment=Num[d[2]];Delay(200);
sl=0x04;Delay(1);Segment=Num[d[1]]&0x7f;Delay(200); //带小数点
sl=0x08;Delay(1);Segment=Num[d[0]];Delay(200);
}
else
{
d[3]=0;
d[2]=0;
d[1]=0;
d[0]=0;
}
}
}
void intial()
{
clear=1; //分频器初始化
fp2=1;
timeN=20; //档位初始化为 Hz 档
dangwei=0;
TMOD=0x61; //定时器0，工作方式1，计数器1，工作方式1
TH0= (65536-50000)/256;
TL0= (65536-50000)%256;
//计数器1计数初值
TH1=0xff; // 256-1;
TL1=0xff; // 256-1;
TR0=1; //开定时器0中断
ET0=1; //定时器0允许
TR1=1; //开计数器1中断
ET1=1; //允许计数器1中断
EA=1; //总中断允许
}
void main()
{
intial();
while(1)
{
dispbuf();
}
}
void timer0() interrupt 1
{
count++;
if(count==timeN)
{
ET1=0; //计时1s，暂停外部计数1
TR1=0;
count=0;
regCount=fCount; //更新显示
fCount=0; //频率计数清零
clear=0; //硬件分频器清零
clear=1;
}
if(dangwei==0) //档位切换
{
pCount=regCount;
if(regCount>999)
{
pCount=0; //显示清零
dangwei=1;
timeN=1; //定时 50ms
fp2=0; //硬件分频处理
TH1=0xfb; //50分频 256-5
TL1=0xfb; //256-5
pCount=regCount*10; //换算成相应的显示：f=regCount*100
}
}
else if(dangwei==1)
{
if(regCount<1)
{
dangwei=0;
timeN=20; //定时 1s
fp2=1; //不分频
TH1=0xff; //256-1
TL1=0xff; //256-1
}
else if(regCount<1000) //KHz 档
{
dangwei=1;
timeN=1; //定时 50ms
fp2=0; //硬件分频处理
TH1=0xfb; //50分频 256-5
TL1=0xfb; //256-5
pCount=regCount*10; //换算成相应的显示：f=regCount*100
}
else
{
dangwei=3; //超出范围
}
}
ET1=1; //恢复外部计数 1
TR1=1;
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
}
void enterFre() interrupt 3 //外部频率输入
{
fCount++;
}
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