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標(biāo)題: stc89c52單片機(jī)實(shí)現(xiàn)自動(dòng)計(jì)數(shù)功能時(shí)總是中途歸零，請(qǐng)高手指點(diǎn) [打印本頁(yè)]

作者: lvshuanghui 時(shí)間: 2013-8-10 19:22
標(biāo)題: stc89c52單片機(jī)實(shí)現(xiàn)自動(dòng)計(jì)數(shù)功能時(shí)總是中途歸零，請(qǐng)高手指點(diǎn)
設(shè)計(jì)目的：?jiǎn)纹瑱C(jī)數(shù)碼管自動(dòng)計(jì)數(shù)
問(wèn)題：中途不定點(diǎn)歸零

程序如下：

#include <reg52.h>             //52系列單片機(jī)頭文件
#define uchar unsigned char
#define uint unsigned int
sbit dula=P2^6;                   //申明U1鎖存器的鎖存端
sbit wela=P2^7;                //申明U2鎖存器的鎖存端
uchar code table[]={
0x3f,0x06,0x5b,0x4f,
0x66,0x6d,0x7d,0x07,
0x7f,0x6f,0x77,0x7c,
0x39,0x5e,0x79,0x71};

void delayms(uint);
void display(uchar,uchar,uchar);
uchar num,num1,bai,shi,ge;
void main()
{
   TMOD=0x11;
   TH1=(65536-45872)/256;
   TL1=(65536-45872)%256;
   EA=1;
   ET1=1;
   TR1=1;
   while(1)
{
   display(bai,shi,ge);
   }
}
void display(uchar bai,uchar shi,uchar ge)  //顯示子函數(shù)
{
wela=1;       //打開(kāi)U2鎖存端
P0=0xfe;    //送入位選信號(hào)
wela=0;       //關(guān)閉U2鎖存端
P0=0xff;       //消影
dula=1;       //打開(kāi)u1鎖存端
P0=table[bai];       //送入段選信號(hào)
dula=0;       //關(guān)閉u1鎖存端
delayms(10);  //延時(shí)10ms

wela=1;
P0=0xfd;
wela=0;
P0=0xff;
dula=1;
P0=table[shi];
dula=0;
delayms(10);

wela=1;
P0=0xfb;
wela=0;
P0=0xff;
dula=1;
P0=table[ge];
dula=0;
delayms(10);
}
void delayms(uint xms)    //延時(shí)子函數(shù)
{
uint i,j;
for(i=xms;i>0;i--)
for(j=110;j>0;j--);
}

void T1_time() interrupt 3  //中斷子函數(shù)
{
TH1=(65536-45872)/256; //重裝初值
TL1=(65536-45872)%256;
num1++;
if(num1==10)  //如果到了10次，中斷時(shí)間到
{
num1=0; //歸零重新計(jì)數(shù)
num++;
      if(num==1000)

      num=0;
      bai=num/100;       //將百位數(shù)送數(shù)碼管
   shi=num%100/10;    //將十位數(shù)送數(shù)碼管
   ge=num%10;          //將個(gè)位數(shù)送數(shù)碼管

}
}

作者: ahshmj 時(shí)間: 2013-8-11 06:57
你將num1設(shè)置成uchar unsigned char，就只能計(jì)數(shù)到255，再加1就會(huì)歸零。不會(huì)到1000.

作者: lvshuanghui 時(shí)間: 2013-8-15 12:04

ahshmj 發(fā)表于 2013-8-11 06:57
你將num1設(shè)置成uchar unsigned char，就只能計(jì)數(shù)到255，再加1就會(huì)歸零。不會(huì)到1000.

明白了，謝謝啦

作者: Changlan『C』染 時(shí)間: 2013-8-16 05:18
說(shuō)的對(duì)，num要設(shè)成uint

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