key.c

12位DA芯片TLC2543驱动程序 12位DA芯片TLC2543驱动程序

#include<reg51.h>

static unsigned char code seg []=
	{
	0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0x88,0x83,0xC6,0xA1,0x86,0x8E,0x7F
	};
	 sbit L1=P0^4;
	 sbit L2=P0^5;
	 sbit L3=P0^6;
	 sbit L4=P0^7;
	 unsigned char keynum;
void key (void)
	{
	  unsigned char keytmp;
	  unsigned char keynum;

		L1=0;L2=1;L3=1;L4=1;
			keytmp=(~P0&0x0f);
			switch(keytmp)
			{
				case 1:keynum=0;break;
				case 2:keynum=4;break;
				case 4:keynum=8;break;
				case 8:keynum=12;break;
				default: break;
			}
					  
		L1=1;L2=0;L3=1;L4=1;
			 keytmp=(~P0&0x0f);
			switch(keytmp) 
				{
					case 1:keynum=1;break;
					case 2:keynum=5;break;
					case 4:keynum=9;break;
					case 8:keynum=13;break;
					default: break;
				}
		
		L1=1;L2=1;L3=0;L4=1;
		 keytmp=(~P0&0x0f);
			switch(keytmp)
				{
				case 1:keynum=2;break;
				case 2:keynum=6;break;
				case 4:keynum=10;break;
				case 8:keynum=14;break;
				default: break;
				}
		
		L1=1;L2=1;L3=1;L4=0;
		 keytmp=(~P0&0x0f);
		switch(keytmp)
			{
				case 1:keynum=3;break;
				case 2:keynum=7;break;
				case 4:keynum=11;break;
				case 8:keynum=15;break;
				default: break;
			}

	}

void main(void)
	{
	 while(1)
	 {
	 key();
	 	P2=0x0f;
		P0=seg[keynum];
				P2=0x0f;
		P0=seg[8];
	// P0=0;
	 }
	}