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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
}
}
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