12864按键翻页

#include<reg52.h>
#define uchar unsigned char
#define uint unsigned int
sbit rs=P1^0;
sbit rw=P1^1;
sbit e=P2^5;
sbit psb=P1^2;
sbit key1=P3^4;
sbit key2=P3^5;
uchar table1[]="  王鑫雨我爱你！";
uchar table2[]="   I LOVE YOU   ";
uchar table3[]="    身体健康！  ";
uchar table4[]="    万事如意！  ";
uchar key1num,key2num;
void delay(uint z)
{
uint x,y;
for(x=z;x>0;x--)
for(y=1;y>0;y--);
}


void write_12864com(uchar com)   //写指令 
{
rw=0;
rs=0;
delay(5);
P0=com;
e=1;
delay(10);

e=0;
delay(5);
}
void write_12864deta(uchar deta)    //写数据
{
rw=0;
rs=1;
delay(5);
P0=deta;
e=1;
delay(10);
e=0;
delay(5);
}
 void init12864()
{
delay(100);
write_12864com(0x30);
delay(200);
write_12864com(0x30);
delay(200);
write_12864com(0x0f);
delay(200);
write_12864com(0x01);
delay(200);
write_12864com(0x06);
delay(50);
key2num=4;

}