本人很菜。利用单片机写了一个电子时钟C语言程序，但无法通过按键来实现设置时间。请各位高手指教。

可按键调节的C语言时钟程序 （郭天祥版）
#include
#define uchar unsigned char
#define uint unsigned int
uchar count,key1num;
char shi,fen,miao;
uchar code hh[]=" 2010-5-4 Tue";
uchar code yy[]=" 00-00-00";
sbit ledrs=P2^4;
sbit ledrw=P2^5;
sbit leden=P2^6;
sbit key1=P1^0;
sbit key2=P1^1;
sbit key3=P1^2;
sbit key4=P1^4;

void delay(uchar x)
{
int i,j;
for(i=0;i for(j=0;j<120;j++);
}
void write_com(uchar com)
{
ledrs=0;
P0=com;
leden=1;
delay(5);
leden=0;
delay(5);
}
void write_date(uchar date)
{
ledrs=1;
P0=date;
leden=1;
delay(5);
leden=0;
delay(5);
}
void init()
{
uchar i;
ledrw=0;
write_com(0x38);
write_com(0x0c);
write_com(0x06);
write_com(0x80);
write_com(0x01);

for(i=0;i<15;i++)
{
write_date(hh[i]);
}
write_com(0x80+0x40);
for(i=0;i<12;i++)
{
write_date(yy[i]);
}
TMOD=0x01;
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
EA=1;
ET0=1;
TR0=1;
}
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()
{
key4=0;
if(key1==0)
{
delay(5);
if(key1==0)
{
key1num++;
while(key1==0);
if(key1num==1)
{
TR0=0;
write_com(0x80+0x40+10);
write_com(0x0f);
}

if(key1num==2)
{
write_com(0x80+0x40+7);
}
if(key1num==3)
{
write_com(0x80+0x40+4);
}
if(key1num==4)
{
key1num=0;
write_com(0x0c);
TR0=1;
}

}

}
if(key1num!=0)
{
if(key2==0)
{
delay(5);
if(key2==0)
{
while(key2==0);
if(key1num==1)
{
miao++;
if(miao==60)
miao=0;
write_sfm(10,miao);
write_com(0x80+0x40+10);

}
if(key1num==2)
{
fen++;
if(fen==60)
fen=0;
write_sfm(7,fen);
write_com(0x80+0x40+7);
}
if(key1num==3)
{
shi++;
if(shi==24)
shi=0;
write_sfm(4,shi);
write_com(0x80+0x40+4);
}
}
}
if(key3==0)
{
delay(5);
if(key3==0)
{
while(key3==0);
if(key1num==1)
{
miao--;
if(miao==-1)
miao=59;
write_sfm(10,miao);
write_com(0x80+0x40+10);
}
if(key1num==2)
{
fen--;
if(fen==-1)
fen=59;
write_sfm(7,fen);
write_com(0x80+0x40+7);
}
if(key1num==3)
{
shi--;
if(shi==-1)
shi=23;
write_sfm(4,shi);
write_com(0x80+0x40+4);
}
}
}
}
}

void main()
{
init();

while(1)
{
keyscan();
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);
}
}

}
void timer0() interrupt 1
{

TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
count++;

}

说实话你编的我确实看不懂，还么学到那么高深的了，
不过用scanf可以实现输入
scanf("%d%d%d%d",&ch1,&ch2,&ch3,&ch4);
不知道能不能对你有些启发，可以试试

没有注释，好难了解你的意图的，写程序时注释一下，别人也容易明白。

我不知道你在干嘛...
//注释很重要..