单片机程序怎么把倒计时变成正计时?

ID:1096516 · 发表于 2023-10-22 13:23

#include <reg52.h>

char code table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};
char code tabledp[]={0xbf,0x86,0xdb,0xcf,0xe6,0xed,0xfd,0x87,0xff,0xef,0xf7,0xfc,0xb9,0xde,0xf9,0xf1};
unsigned char num[2];
char miao=0;

sbit key1=P3^5;
sbit key2=P3^6;
sbit key3=P3^7;

sbit beep=P1^4;
sbit w1=P1^0;
sbit w2=P1^1;
char menu=0;
char flag=0;
void delay(unsigned int z)
{
      unsigned int i,j;
      for(i=0;i<z;i++)
      for(j=0;j<621;j++);
}

void TimerInit()
{
      TMOD = 0x11;

      TH0 = (65536-50000)/256;
      TL0 = (65536-50000)%256;;
      ET0  = 1;
      TR0       = 1;

      TH1 = (65536-50000)/256;
      TL1 = (65536-50000)%256;;
      ET1 = 1;
      TR1 = 0;

      EA = 1;
}

void display()
{
      num[0]=miao%10;
      num[1]=miao/10;

      if(menu==1)
      {
            if(flag==0)
            {
                     num[0]=10;
                     num[1]=10;
            }
      }

      w1=1;
      w2=0;
      P2=table[num[0]];
      delay(1);
      w1=w2=1;

      w1=0;
      w2=1;
      P2=table[num[1]];
      delay(1);
      w1=w2=1;
}
void key()
{
      if(key1==0)
      {
            while(key1==0);
            menu++;
            if(menu==1){TR0=1;TR1=0;}
            if(menu==2){TR0=0;menu=0;}
      }
      if(menu==1)
      {
            if(key2==0)
            {
                     while(key2==0);
                     miao++;
                     if(miao>99)miao=99;
            }
            if(key3==0)
            {
                     while(key3==0);
                     miao--;
                     if(miao<0)miao=0;
            }
      }
}
void main()
{
      TimerInit();
      P0=0X55;
      while(1)
      {
            key();
            display();
            if(menu==0)
            {
                     if(key2==0)
                     {
                              while(key2==0);
                              if(miao>0)
                              {
                                    TR1=1;
                              }
                     }
                     if(key3==0)
                     {
                              while(key3==0);
                              TR1=0;
                     }
            }
      }
}
char jishu;
void Timer0(void) interrupt 1
{

      TH0 = (65536-50000)/256;
      TL0 = (65536-50000)%256;;
      jishu++;
      if(jishu==10)
      {
            jishu=0;
            flag++;
            if(flag==2)flag=0;
      }

}

char value;
void time1_int() interrupt 3
{

      TH1 = (65536-50000)/256;
      TL1 = (65536-50000)%256;;

      value++;
      if(value ==20)
      {
            value =0;

            if(miao>0)miao--;

            if(miao==0)
            {
                     TR1=0;miao=0;
            }
            if(miao<10)beep=0;
            else beep=1;
      }
}

ID:883242 · 发表于 2023-10-22 18:00

把miao--;改成miao++;

ID:584814 · 发表于 2023-10-23 09:27

改初始化值，变加为减就可以。

ID:1083996 · 发表于 2023-10-23 09:58

那一个时钟，时：分：秒这种，把秒弄成60秒倒计时，时：分，正常显示，这样效果是不是就能感觉生命正在流失的紧张感了

ID:1097455 · 发表于 2023-10-27 10:47

value++;
      if(value ==20)
      {
            value =0;

            if(miao>0)miao;

            if(miao>=60)
            {
                     TR1=0;miao=0;
            }
            if(miao<10)beep=0;
            else beep=1;
      }

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单片机程序 怎么把倒计时变成正计时?

单片机程序怎么把倒计时变成正计时?