#include<reg51.h>
#define GPIO_DIG P0
unsigned char code DIG_CODE[10]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};//顯示0~9的值
int tmp = 1;
#define uchar unsigned char
sbit BB = P1^0;//接編碼器A端
sbit AA = P1^1;//接編碼器B端
void delayms(uchar count)
{
uchar i,j;
for(i = 0; i < count; i++)
for(j = 0; j < 120; j++);
}
/**********************************
5ms延時(shí)函數(shù)
**********************************/
void delay(void) //延時(shí)5ms
{
uchar a, b;
for(b = 19; b > 0; b--)
for(a = 130; a > 0; a--);
}
void main()
{
while(1)
{ if(tmp<1){tmp=1;}
if(tmp>8){tmp=9;}
GPIO_DIG=~DIG_CODE[tmp];
if(AA == 0)//開(kāi)始檢測(cè)是否旋轉(zhuǎn)了開(kāi)關(guān)
{
delayms(10);//消除抖動(dòng)
if(AA == 0) //確實(shí)是旋轉(zhuǎn)了，進(jìn)行正反轉(zhuǎn)判斷
{
if(BB == 0)//正轉(zhuǎn)，進(jìn)行正轉(zhuǎn)處理
{
tmp++;//為了使LED正向遞增
}
if(BB == 1)//反轉(zhuǎn)，進(jìn)行反轉(zhuǎn)處理
{
tmp--;//為了使LED反向遞減
}
}
while(AA == 0)//等待開(kāi)關(guān)A端復(fù)位（斷開(kāi)），防止出現(xiàn)亂加減的現(xiàn)象
{
delayms(20);//延時(shí)等待
}
}
}
}
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