key.c

本文件是用keil软件编程的键盘控制程序

#include<reg51.h>
#include <intrins.h>

sbit	SDA=P1^0;
sbit	CLK=P1^1;
sbit	kd_key=P1^2;
sbit	LEDP1=P1^6;
sbit	LEDP2=P1^5;
sbit	LEDP3=P1^4;
sbit	LEDP4=P1^3;

unsigned char dbuffer1,dbuffer2,dbuffer3,dbuffer4,dbuffer;
unsigned char table[10]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90};
unsigned char counter,n;
int minter,second;

void	send(unsigned char a)
{
	data unsigned char i;
	for(i=0;i<8;i++)
	{
		if(_crol_(a,i)&0x80)
			SDA=1;
		else
			SDA=0;
		CLK=1;
		CLK=0;
	}
}
void display(int minter,int second)
{
	unsigned char i;
	unsigned char a[4];
		a[0]=minter/10;
		a[1]=minter%10;
		a[2]=second/10;
		a[3]=second%10;
		for(i=0;i<4;i++)
   		{		    
		     send(table[a[i]]);
             LEDP1=0;
             for(i=0;i<200;i++)
             LEDP1=1;
 		}
}

void time_add(int minter,int second)
{
	second++;
	if(second==60)
	{
		minter++;
		second=0;
		if(minter==60)
		{
			minter=0;
		}
	}
}

void time_adds(int second)
{
	second++;
	if(second==60)
	{
		second=0;
	}
}
void time_addm(int minter)
{
	minter++;
	if(minter==60)
	{
		minter=0;
	}
}

main()
{ 
    int flag,j;
	unsigned char i,jkey;	
	TMOD=0x01;
	TH0=0x3B;
	TL0=0xC0;	
	
	EA=1;
	ET0=1;
	TR0=1;

	    
	LEDP1=1;
    LEDP2=1;
    LEDP3=1;
    LEDP4=1;

	while(1)
	{	
        jkey=0xfe;
        flag=0;

        for(i=0;i<8;i++)
        {
           send(jkey);
           if (!kd_key)
           {
             for(j=0;j<200;j++)
             send(jkey);
             if (!kd_key)
              {
               flag=1;break;
              }
             else
             jkey=_crol_(jkey,1);
            } 
         }
         if(flag==1) 
         {
           switch(i)
           {
            case 0 :time_adds(second);display(minter,second);break;
            case 1 :time_addm(minter);display(minter,second);break;
		    case 2 :display(minter,second);break;
			case 3 :display(minter,second);break;
		    case 4 :display(minter,second);break;
			case 5 :display(minter,second);break;
		    case 6 :display(minter,second);break;
			case 7 :display(minter,second);break;
            }
          }
	}
}

void	timer0_int(void)	interrupt	1
{
	TR0=0;
	TH0=0x3B;
	TL0=0xC0;
	if(!(counter--))
	{
		counter=0x16;
		time_add(minter,second);
	}
	TR0=1;
}