求助 AT89C52 万年历

用1302和1602这两个 1302自带的那个小框显示的时间都对 就是液晶上显示的不动 困扰了好几天了 求大神赐教 （我刚开始学）程序如下
#include<reg52.h>
#include <intrins.h>
#define uchar unsigned char
sbit lcden=P2^4;
sbit lcdrs=P2^3;
sbit io=P2^2;
sbit rst=P2^0;
sbit sck=P2^1;
uchar y1,y2,mo1,mo2,d1,d2,w1,w2,h1,h2,m1,m2,s1,s2,i,j;
uchar time_date[7]={8,9,2,8,9,0,7}; //年，星期，月，日，时，分，秒
uchar write_add[7]={0x8c,0x8a,0x88,0x86,0x84,0x82,0x80};
uchar read_add[7]={0x8d,0x8b,0x89,0x87,0x85,0x83,0x81};
void delay(int z)
{
int x,y;//1ms延时
for(x=z;x>0;x--)
for(y=110;y>0;y--);
}
void write_com(uchar com)
{
lcdrs=0;
P3=com;
delay(5);
lcden=1;
delay(5);
lcden=0;
}
void write_date(uchar date)
{
lcdrs=1;
P3=date;
delay(5);
lcden=1;
delay(5);
lcden=0;
}
void write_ds1302_byte(uchar date)
{
uchar i;
for(i=0;i<8;i++)
{
sck=0;
io=date&0x01; //取最高位
date=date>>1;
sck=1;
}
}
void write_ds1302(uchar add,uchar date)
{
rst=0;
_nop_();
sck=0;
_nop_();
rst=1;
_nop_();
write_ds1302_byte(add);
write_ds1302_byte(date);
rst=0;
_nop_();
io=1;
sck=1;
}
uchar read_ds1302(uchar add)
{
uchar i,value;
rst=0;
_nop_();
sck=0;
rst=1;
_nop_();
write_ds1302_byte(add);
for(i=0;i<8;i++)
{
sck=0;
value=value>>1;
if(io==1)
value=value|0x80;//要传输数据的当前值置为1,若不是,则为0
sck=1;
}
rst=0;
_nop_();
sck=0;
_nop_();
sck=1;
io=1;
return value;
}
void init()
{
lcden=0;
write_com(0x38);
write_com(0x0c);
write_com(0x06);
write_com(0x01);
}
void main()
{
init();
for(i=0;i<7;i++)
{
j=time_date[i]/10;
time_date[i]=time_date[i]%10;
time_date[i]=time_date[i]+j*16;
}
write_ds1302(0x8e,0x00);//去除写保护
for(i=0;i<7;i++)
{
write_ds1302(write_add[i],time_date[i]);
}
write_ds1302(0x8e,0x80);//打开写保护
while(1)
{
for(i=0;i<7;i++)
{
read_ds1302(read_add[i]);
}
s1=time_date[6]/16;
s2=time_date[6]%16;
m1=time_date[5]/16;
m2=time_date[5]%16;
h1=time_date[4]/16;
h2=time_date[4]%16;
d1=time_date[3]/16;
d2=time_date[3]%16;
mo1=time_date[2]/16;
mo2=time_date[2]%16;
w1=time_date[1]/16;
w2=time_date[1]%16;
y1=time_date[0]/16;
y2=time_date[0]%16;
write_com(0x80+2);
write_date(y1+0x30);
write_date(y2+0x30);
write_date('-');
write_date(mo1+0x30);
write_date(mo2+0x30);
write_date('-');
write_date(d1+0x30);
write_date(d2+0x30);
write_date(' ');
write_date(w1+0x30);
write_date(w2+0x30);
write_com(0x80+0x40+3);
write_date(h1+0x30);
write_date(h2+0x30);
write_date(':');
write_date(m1+0x30);
write_date(m2+0x30);
write_date(':');
write_date(s1+0x30);
write_date(s2+0x30);
}
}