[嵌入式]51单片机倒计时，大家帮忙看看还能咋改

大佬帮忙看看还能咋改

 #include <REG52.H>

void de10();
void de();

void change_time();
sbit led=P2^5;

 long int s2,s1;
  int i=0;
	
 sbit p22=P2^2;
 sbit p23=P2^3;
 sbit p24=P2^4;

sbit k1=P3^1;
sbit k2=P3^0;
sbit k3=P3^2;
sbit k4=P3^3;


char num[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};


void change_time(){
	//  she ding shi jain

	
	static	int sx=1;
	
	
	if(k1==0){
	de10();
		if(k1==0&&sx==1){
		sx=2;
		}
		else if(k1==0&&sx==2){
		sx=1;
		}
		while(!k1);
		
	}
	
if(k2==0){

	if(k2==0){
		while(!k2);
	switch(sx){
		case 1:s1++;break;
		case 2:s2++;break;
	}

	}
//	while(!k1);
}

if(k3==0){

	if(k3==0){
			while(!k3);
	switch(sx){
		case 1:s1--;break;
		case 2:s2--;break;
	}

	}

}

if(s1==10&&s2!=9){
s1=0;
s2++;
}
if(s1==-1&&s2!=0){
s1=9;
	s2--;
}
if(s1>=9&&s2>=9){
s1=9;s2=9;
}
if(s1<=0&&s2<=0){
s1=0;s2=0;
}
if(s2>=9){
s2=9;

}


}
	
	


void de10()		//@12.000MHz
{
	unsigned char i, j;

	i = 117;
	j = 184;
	do
	{
		while (--j);
	} while (--i);
}


void de()		//@12.000MHz
{
	unsigned char i, j;

	i = 3;
	j = 82;
	do
	{
		while (--j);
	} while (--i);
}
void dakai(){
	EA=1;
	ET0=1;
	TMOD|=0X01;
	TH0=0Xd8;
	TL0=0Xf0;
TR0=1;
}
/
void main(){
	while(1){
		
		while(k4)
			{
			change_time();		
		P0=num[s1];
	p22=0;
	p23=0;
	p24=0;
de();
				
		P0=num[s2];
	p22=1;
	p23=0;
	p24=0;
		de();
		}
		dakai();

	}

}

///
void inti0() interrupt 1{
	TH0=0xd8;
	TL0=0xf0;
	i++	;
	//xiang xia jian
	
if(i==166){
s1=s1-1;
	i=1;
}
}