4.c

刚学时编的小程序

#include <AT89X51.H> 
#include <ABSACC.H>

char data_7se[16]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};
char act[4]	={0xfe,0xfd,0xfb,0xf7} ;
char disp[4]  ;
char key;
char skey[16]={'A','B','C','D','3','6','9','#','2','5','8','0','1','4','7','*'}	 ;

delay(int t)
{
	int i,j;
	for(i=0;i<t;i++)
		for(j=0;j<100;j++);
}

led_b1()
{
	char i;
	for(i=0;i<4;i++)
	{
		P1_7=~P1_7;
		delay(800);
	}
}

init_buf()
{
	int i;
	for(i=0;i<4;i++)
		{
			disp[i]=data_7se[i];
			P2=disp[i] ;
			delay(800);
		}
}

char scan_key()
{
	char i,j,find,ini,inj;
	char in;
	find=0;
	for(i=0;i<4;i++)
	{
		P3=act[i];
		delay(30);
		in=P3;
		in=in>>4;
		in=in|0xf0;
		for(j=0;j<4;j++)
			if(act[j]==in)
			{
				find=1;
				inj=j,ini=i;
			}
	}
	if(find==0)  return 0;
    key=ini*4+inj;
	return 1;
}

main()
{
	led_b1();
	init_buf();
	loop();
}

loop()
{
	char c;
	while(1)
	{
		if(scan_key()==1)
		{
			c=skey[key]	 ;
			P2=data_7se[key];
		}
	}
}