[嵌入式]亚龙学习51单片机按钮控制0123数码管

#include <STC15.H>
 sbit STCP=P1^0;
 sbit SHCP=P1^1;
 sbit DS=P1^2;
unsigned char code  DisplayHex[]={0xC0,0xf9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90,0x88,0x83,0xc6,0xa1,0x86,0x8e,0xff};
unsigned char disp[4];
unsigned char key,keytemp,keyres,keycount,keyrelease;
 void Delay(unsigned int i )
 {
	 unsigned char j;
 while (i)
  {
	 i--;
	 for(j=255;j>0;j--)
	 {
	 }
  }
 }
  void Send(unsigned char a)
	{
		unsigned char i,j;
		j=0x80;
		for(i=0;i<8;i++)
		{
			if(a&j) DS=1;
			else          DS=0;
			SHCP=0;
			SHCP=1;
			j>>=1;	
	  }
	}
    void Dispshuma()
	{
		unsigned char i;
		for(i=0;i<4;i++)
		{
			Send(DisplayHex[disp[i]]);
		}
		STCP=0;
		STCP=1;
}
unsigned char keyscan()
{
	unsigned char keyvalue,p;
	P1=P1|0xF0;
	keyvalue=P1&0xF0;
   if(keyvalue!=0xf0)
     {
			 if(keyvalue==0x70)p=0;
			 else if(keyvalue==0xb0)p=1;
			 else if(keyvalue==0xd0)p=2;
			 else if(keyvalue==0xe0)p=3;
			 else p=25;
		 }
		 else
		 {
			 p=25;
			 keyrelease=1;
		 }
	 }
	void main()
{
	P0M0=0XFF;P0M1=0;
	P1M0=0XFF;P1M1=0;
	TMOD=0X01;
	TH0=(65536-50000)/256;
	TL0=(65536-50000)%256;
	EA=1;
	ET0=1;
	TR0=1;
    while(1)
	 {
     Dispshuma();
		 P1=P1|0xF0;
	 }
 }
void T0_time()  interrupt 1
{
	TH0=(65536-50000)/256;
	TL0=(65536-50000)%256;
	
	key=keyscan();
	if(keyrelease)
	{
		if(key!=25)
		{
			keycount++;
			if(keytemp==0)keytemp=key;
			else
			{
				if(keytemp=key)
				{
						if(keycount>40)keycount=40;
				}
			}
			if(keycount>2)
			{
				if(keyres==0)
				{
					keyres=1;
					keyrelease=0;
					/***************/
					disp[0]=key;
					disp[1]=16;
					disp[2]=16;
					disp[3]=16;
					/***************/
				}
			}
		}
		else
		{
			keycount=0;
			keytemp=0;
			keyres=0;
		}
	}
}