c 51 MCU frequency meter code sharing of digital frequency meter design

  • 2020-05-27 06:58:13
  • OfStack


#include <reg51.h>
#define uchar unsigned char
#define uint unsigned int
#define ulong unsigned long
// The keys 
sbit button=P1^7;
//LED
sbit led2=P3^5;
sbit led3=P3^7;
// Digital tube bit selection 
sbit c0 = P3^0;
sbit c1 = P3^1;
sbit c2 = P3^2;
sbit c3 = P3^3;
// Digital segment code 
uchar code dm[]={0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90}; 
uchar wm[]={0,0,0,0};
ulong pl;
uchar mode;
void delay3ms(void)   // error  0us
{
    unsigned char a,b,c;
    for(c=1;c>0;c--)
        for(b=176;b>0;b--)
            for(a=7;a>0;a--);
}
void smg()
{
 static uchar i=0;
 c0=1;c1=1;c2=1;c3=1;
 P1 = 0XFF;
 switch(i)
 {
  case 0: c0=0;
  break;
  case 1: c1=0;
  break;
  case 2: c2=0;
  break;
  case 3: c3=0;
  break;
 }
 P1 = dm[wm[i]];
 i++;
 if(i>3)
 {
  i=0;
 }  
}
void ledmode()
{
 switch(mode)
 {
  case 0:led2=led3=0;
  break;
  case 1:led2=1;led3=0;
  break;
  case 2:led2=0;led3=1;
  break;
  case 3:led2=led3=1;
  break;
 }
}
void key()
{
 static uchar num;
 delay3ms();
 button=1;
 switch(num)
 {
  case 0: if(!button)
    {
     num=1;
    }
  break;
  case 1: if(!button)
    {
     if(mode<3)
     {
      mode++;
     }
     else 
     {
      mode=0;
     }
     num=2;
    }
    else
    {
     num=0;
    }
  break;
  case 2: if(button)num=3;
  break;
  case 3: if(button)num=0;
  break;
 }
} 

void timeinit()
{
 TMOD=0x15;  // Set up the T0T1 Control word 
 TH0=0x00;
 TL0=0x00;
 TH1=0xfC;
 TL1=0x18;
 ET0=1;  // The timer 0 Interruption allows 
 ET1=1;
 TR0=1;  // Start the T0 count 
 TR1=1;  // And start the T1 count 
 EA=1;  //CPU Open the interrupt 
}
 

void main()
{
 timeinit();
 while(1)
 {
  smg(); 
  ledmode();
  key();
 }
}
void t1()interrupt 3
{
 static uint time;
 TR0=0;
 TH1=(65536-10000)/256;
 TL1=(65536-10000)%256;
 time++;
 if(time>99)
 {
  time=0;
  pl=TH0*256+TL0;
  wm[0]=(pl/1000)%10;
  wm[1]=(pl/100)%10;
  wm[2]=(pl/10)%10;
  wm[3]=pl%10;
  TH0=TL0=0;
 }
 TR0=1;
}


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