增量式光电编码器鉴相和计数

#include <reg52.h>
#define uint unsigned int
#define uchar unsigned char 
#define U8 unsigned char 
sbit PINA=P2^0; //Q输出位
int counter=0;
uint a;
uint count;
void display(); //待显温度值转换
sbit lcden=P3^4;
sbit lcdrs=P3^5;
sbit dula=P2^6;
sbit wela=P2^7;
void DelayMs(uint z)
{
uint x,y;
for(x=z;x>0;x--)
for(y=110;y>0;y--);
}
void write_com(U8 com)//write common
{
lcdrs=0;
P0=com;
DelayMs(5);
lcden=1;
DelayMs(5);
lcden=0;
}
void write_data(U8 date) //write data
{