单片机液晶24秒倒计时可暂停继续重置

ID:998091 · 发表于 2021-12-29 09:54

#include <reg51.h>
#include <intrins.h>
sbit RS=P0^7;
sbit RW=P0^6;
sbit E=P0^5;
sbit S2=P3^3;
unsigned char count=0;
unsigned char s=24;
unsigned char m=0;
unsigned char h=0;

void lcd_w_cmd(unsigned char com);
void lcd_w_dat(unsigned char dat);
unsigned char lcd_r_start();
void lcd_int();
void delay(unsigned int i);
void delay1();

void int_1() interrupt 2{
      if(S2==0){
            delay(1200);
            if(S2==0){
                     s=24;
                     count=0;
                     TH1=(65536-50000)/256;
                     TL1=(65536-50000)%256;
                     TR1=1;
            }
      }
}
      bit b=0;
      void int_0() interrupt 0
      {if(b==0)
      {TR1=0;b=1;P1=0xfe;}
            else{b=0;TR1=1;P1=0xff;}
      }
            void timer_1() interrupt 3{
                     TH1=(65536-50000)/256;
                     TL1=(65536-50000)%256;
                     count++;
                     if(count==20){
                              count=0;
                              s--;
                              if(s==0){
                                    s=24;
                              }
                     }
            }

void delay1(){
  _nop_();
  _nop_();
  _nop_();
}

void lcd_int(){
  lcd_w_cmd(0x3c);
  lcd_w_cmd(0x0c);
  lcd_w_cmd(0x01);
  lcd_w_cmd(0x06);
  lcd_w_cmd(0x80);
}

unsigned char lcd_r_start(){
  unsigned char s;
  RW=1;
  delay1();
  RS=0;
  delay1();
  E=1;
  delay1();
  s=P2;
  delay1();
  E=0;
  delay1();
  RW=0;
  delay1();
  return(s);
}

void lcd_w_cmd(unsigned char com){
  unsigned char i;
  do{
i=lcd_r_start();
i=i&0x80;
delay(2);
   }while(i!=0);
  RW=0;
  delay1();
  RS=0;
  delay1();
  E=1;
  delay1();
  P2=com;
  delay1();
  E=0;
  delay1();
  RW=1;
  delay(255);
}

void lcd_w_dat(unsigned char dat){
  unsigned char i;
  do{
i=lcd_r_start();
i=i&0x80;
delay(2);
   }while(i!=0);
  RW=0;
  delay1();
  RS=1;
  delay1();
  E=1;
  delay1();
  P2=dat;
  delay1();
  E=0;
  delay1();
  RW=1;
  delay(255);
}
void main(){
      unsigned char lcd[]="0123456789";
  unsigned char i;
      TMOD=0x10;
      TH1=(65536-50000)/256;
      TL1=(65536-50000)%256;
      ET1=1;
      EX0=1;
      IT0=1;
      EX1=1;
      IT1=1;
      EA=1;
      TR1=1;
      P2=0xff;
      lcd_int();
      delay(255);
      lcd_w_cmd(0x84);
      delay(255);
      while(1){
            for(i=0;i<9;i++){
                     switch(i){
                              case 0:lcd_w_dat(lcd[h/10]);break;
                              case 1:lcd_w_dat(lcd[h%10]);break;
                              case 2:lcd_w_dat(':');break;
                              case 3:lcd_w_dat(lcd[m/10]);break;
                              case 4:lcd_w_dat(lcd[m%10]);break;
                              case 5:lcd_w_dat(':');break;
                              case 6:lcd_w_dat(lcd[s/10]);break;
                              case 7:lcd_w_dat(lcd[s%10]);break;
                              case 8:lcd_w_cmd(0x84);break;
                     }
}
      }
}
void delay(unsigned int i){
  unsigned int k;
      for(k=0;k<i;k++);
}

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