单片机实现分钟计时器，从00.00都59.59，不知道哪里错了。求大佬答疑！

ID:718035 · 发表于 2020-4-6 13:57

#include<reg52.h>
sbit a=P1^0;
sbit b=P1^1;
unsigned char code discode1[]={0xbf,0x86,0xdb,0xcf,0xe6,0xed,0xfd,0x87,0xff,0xef};
unsigned char code discode2[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};
#define uchar unsigned char
uchar counter=0;
uchar key=0;
uchar second=0;
uchar minute=0;
main()
{
      a=1;
      b=0;
TMOD=0X01;
TH0=0xDc;
TL0=0x00;
         EA=1;
ET0=1;
TR0=1;
while(1)
{
      if((P3&0x80)==0x00)
                              {
         key++;
         switch(key)
         {
            case 1:
            P2=0x7f; //11111111
            P0=discode2[second%10];
            break;
            case 2:
            P2=0xbf;    //10111111
            P0=discode2[second/10];
            break;
            case 3:
            P2=0xdf;    //11011111
            P0=discode2[minute%10];
            break;
         }
      }
}
}
void zhongduan()interrupt 1
{
TH0=0xee;
TL0=0x00;
TF0=0;
TR0=1;
counter++;
if(counter==200)
{
   counter=0;
   second++;
   if(second==60)
   {
      second=0;
      minute++;
   }
   }
}

ID:584814 · 发表于 2020-4-15 15:15

key++，加到 key 的值大于 4 以后呢？

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