为什么我想修改第一行的年月日，按下y1，光标直接跳到第二行上不来了，控制年月日的按键都没用，请教大佬们要怎么修改， 谢谢
单片机源程序如下:
#include<reg52.h>
#define uint unsigned int
#define uchar unsigned char
sbit en=P3^4;
sbit rs=P3^5;
sbit s1=P3^0;
sbit s2=P3^1;
sbit s3=P2^0;
sbit s4=P2^1;
sbit dula=P2^6;
sbit wela=P2^7;
sbit y1=P3^3;
sbit y2=P2^2;
sbit y3=P2^4;
char shi,fen,miao;//char??-128~127
char nian,yue,ri;
uchar count,s1num,y1num; //uchar??0~255
uchar code table[]=" 2020-05-03 SUN";
uchar code table1[]=" 00:00:00";
void write_com(uchar com);
void write_date(uchar date);
void delay(uint z)
{
uint x,y;
for(x=z;x>0;x--)
for(y=110;y>0;y--);
}
void write_com(uchar com)
{
rs=0;
en=0;
P0=com;
delay(5);
en=1;
delay(5);
en=0;
}
void write_date(uchar date)
{
rs=1;
en=0;
P0=date;
delay(5);
en=1;
delay(5);
en=0;
}
void init()
{
uchar num;
dula=0;
wela=0;
num=0;
en=0;
TMOD=0X01;
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
EA=1;
ET0=1;
TR0=1;
write_com(0x38);
write_com(0x0c);
write_com(0x06);
write_com(0x01);
write_com(0x80);
for(num=0;num<16;num++)
{
write_date(table[num]);
delay(5);
}
write_com(0x80+0x40);
for(num=0;num<12;num++)
{
write_date(table1[num]);
delay(5);
}
}
void write_nyr(uchar add1,uchar date1)
{
uchar shi1,ge1;
shi1=date1/10;
ge1=date1%10;
write_com(0x80+add1);
write_date(0x30+shi1);
write_date(0x30+ge1);
}
void write_sfm(uchar add,uchar date)//?????????
{ uchar shi,ge;
shi=date/10;
ge=date%10;
write_com(0x80+0x40+add);
write_date(0x30+shi);
write_date(0x30+ge);
}
void keyscan()
{
if(y1==0)
{
delay(5);
if(y1==0)
{
y1num++;
while(!y1);
if(y1num==1)
{
write_com(0x80+0+11);
write_com(0x0f);
}
if(y1num==2)
{
write_com(0x80+0+8);
}
if(y1num==3)
{
write_com(0x80+0+5);
}
}
if(y1num!=0)
{
if(y2==0)
{
delay(5);
if(y2==0)
{
while(!y2);
if(y1num==1)
{
ri++;
if(ri==30)
ri=0;
write_nyr(12,ri);
write_com(0x80+0+12);
}
if(y1num==2)
{
yue++;
if(yue==12)
yue=0;
write_nyr(9,yue);
write_com(0x80+0+9);
}
if(y1num==3)
{
nian++;
if(nian==99)
nian=0;
write_nyr(6,nian);
write_com(0x80+0+6);
}
}
}
}
if(y3==0)
{
delay(5);
if(y3==0)
{
while(!y3);
if(y1num==1)
{
ri--;
if(ri==-1)
ri=30;
write_nyr(12,ri);
write_com(0x80+0+12);
}
if(y1num==2)
{
yue--;
if(yue==-1)
yue=12;
write_nyr(9,yue);
write_com(0x80+0+9);
}
if(y1num==3)
{
nian--;
if(nian==-1)
nian=30;
write_nyr(6,nian);
write_com(0x80+0+6);
}
}
}
}
}
void main()
{
init();
while(1)
{
keyscan();
}
}
void timer0() interrupt 1
{
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
count++;
if(count==20)
{
count=0;
miao++;
if(miao==60)
{
miao=0;
fen++;
if(fen==60)
{
fen=0;
shi++;
if(shi==24)
{
shi=0;
}
write_sfm(4,shi);
}
write_sfm(7,fen);
}
write_sfm(10,miao);
}
}
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