04-数码管动态显示

# include "reg52.h"

void delay(unsigned char i)
{
	while(i--);
}

void showseg();

void maindelay(unsigned char t)
{
	while(t--)
	{
		showseg();
	}
}

unsigned char yu = 1;
	
unsigned char code table[] = 
{
	0xc0,//0
	0xf9,//1
	0xa4,//2
	0xb0,//3
	0x99,//4
	0x92,//5
	0x82,//6
	0xf8,//7
	0x80,//8
	0x90,//9
	0x88,//A
	0x83,//B
	0xc6,//C
	0xa1,//D
	0x86,//E
	0x8e,//F
	0xbf,//-
	0x7f//.
};


void HC138(unsigned char n)
{
	switch(n)
	{
        case 4:
			P2 = (P2 & 0x1f) | 0x80;
        	break;
		
        case 5:
			P2 = (P2 & 0x1f) | 0xa0;
        	break;
		
		case 6:
			P2 = (P2 & 0x1f) | 0xc0;
        	break;
		
		case 7:
			P2 = (P2 & 0x1f) | 0xe0;
        	break;
	}
}

void show(unsigned char pos,unsigned char dat)
{
	HC138(7);//数码管的内容
	P0 = table[dat];
	HC138(6);//数码管的位置
	P0 = 0x01 << pos;
}


void showseg()
{
	show(0,2);//2018
	delay(500);
	show(1,0);
	delay(500);
	show(2,1);
	delay(500);
	show(3,8);
	delay(500);
	
	show(4,16);//--
	delay(500);
	show(5,16);
	delay(500);
	
	show(6,yu/10);//月份
	delay(500);
	show(7,yu%10);
	delay(500);
	
}


void main()
{
	while(1)
	{
		showseg();
		yu++;
		if(yu > 12)
			yu = 1;
		
		maindelay(1000);
		
	}
}