为什么实现不了单片机倒计时呢，是哪里错了，还是思路就错了吗？求指点

ID:512883 · 发表于 2019-5-6 16:21

#include <reg52.h>
LED_[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};
disbuf[]={0x01,0x02};
unsigned char m;
void delay(unsigned char time)
{
  unsigned char i;
  int j=0;
  for(i=time;i>0;i--)
for(j=0;j<125;j++);
}
break_() interrupt 3
{
      delay(1);
      m=m-1;
}
void main()
{
      int j=0;
      TMOD=0x20;
      EA=1;
      ET1=1;
      TR1=1;
      TH1=0x1a;
      TL1=0x1a;
      m=99;
      while(1)
{
      if(j==0)
      {
            P1=disbuf[j];
            P2=LED_[m%10];
            delay(10);
            j=1;
      }
      else
      {
            P1=disbuf[j];
            P2=LED_[m/10];
            delay(10);
            j=0;
      }
}
}

ID:213173 · 发表于 2019-5-6 21:25

1.位码错误 2.中断函数计数变量m计量单位只有250us，要换算成秒来显示。int j=0;数据类型使用的不恰当

#include <reg52.h>
LED_[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};
disbuf[]={0xfe,0xfd};
char m;
unsigned int n;
void delay(unsigned char time)
{
unsigned char i;
int j=0;
for(i=time;i>0;i--)
for(j=0;j<125;j++);
}
break_() interrupt 3
{
// delay(1);
n++;
if(n>=4000)
{
n=0;
m--;
if(m<0)
m=99;
}
}
void main()
{
int j=0;
TMOD=0x20;
EA=1;
ET1=1;
TR1=1;
TH1=0x1a;
TL1=0x1a;
m=99;
while(1)
{
if(j==0)
{
P1=disbuf[j];
P2=LED_[m%10];
delay(10);
j=1;
}
else
{
P1=disbuf[j];
P2=LED_[m/10];
delay(10);
j=0;
}
}
}

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