单片机频率计原理程序代码

#include
//********数码管位代码表(P0口)**********//
unsigned char code dispbit[]={0xfe，0xfd，0xfb，0xf7，0xef，0xdf，0xbf，0x7f};
//********数码管段代码表(P2口，共阴且高位接a，低位接h笔段)**********//
unsigned char code dispcode[]={0xFC，0x60，0xDA，0xF2，0x66，0xB6，0xBE，0xE0，
0xFE，0xF6，0xEE，0x3E，0x9C，0x7A，0x9E，0x8E，0x00};
//********8位数据缓冲器**********//
unsigned char dispbuf[8];
unsigned char temp[8];
unsigned char dispcount;
unsigned char T0count;
unsigned char timecount;
bit flag;
unsigned long x;

//*********初始化模块**********//
void initial(void){
TMOD=0x15;
TH0=0;
TL0=0;
TH1=(65536-4000)/256;
TL1=(65536-4000)%256;
TR1=0;
TR0=0;
ET0=1;
ET1=1;
EA=1;
}
//******************************************************//

//*********显示模块**********//
void dataDisplay(){
unsigned char i;
for(i=0;i<8;i++){
temp[i]=0;
}
i=0;
while(x/10){
temp[i]=x%10;
x=x/10;
i++;
}
temp[i]=x;
for(i=0;i<8;i++){
dispbuf[i]=temp[i];
}
P2=dispcode[dispbuf[dispcount]];
P0=dispbit[dispcount];
dispcount++;
if(dispcount==8){
dispcount=0;
}
}
//******************************************************//

//*********信号频率测量模块**********//
float frequency(float freq){
initial();
TR0=1;TR1=1;
if(timecount==250){
TR0=0;
freq=T0count*65536+TH0*256+TL0;
return(freq);
}
}
//******************************************************//

//*********信号周期测量模块**********//
float cycle(float count){
initial();
if(P3_4==1){
TR0=1;TR1=1;
if(P3_4==0){
TR0=0;
count=1000000/(timecount*4000+TH1*256+TL1-61536);
}
}
return(count);
}
//******************************************************//

//*********定时中断服务程序1**********//
void t1(void) interrupt 3 using 0{
//initial();
//TR0=1;
//TR1=1;
TH1=(65536-4000)/256;
TL1=(65536-4000)%256;
timecount++;
}
//******************************************************//

//*********定时中断服务程序2**********//
void t0(void) interrupt 1 using 0{
//initial();
//TR0=1;
//TR1=1;
T0count++;
}
//******************************************************//

//*********主函数**********//
void main(void){
while(1){
x=frequency(x);
if(x<100){
x=cycle(x);
}
dataDisplay();
}
}
//******************************************************//

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