led.c

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#include <reg52.h>
typedef  unsigned char   uint8;
typedef  unsigned int    uint16;
typedef  unsigned long   uint32;  

code uint8 graph[] = {0xFF,0x99,0x00,0x00,0x00,0x81,0xC3,0xE7};
sbit ENLED = P1^4;
sbit ADDR0 = P1^0;
sbit ADDR1 = P1^1;
sbit ADDR2 = P1^2;
sbit ADDR3 = P1^3;


void timer1_init()
{
	TMOD |= 0x10;
	TMOD &= 0xdf;  
	TH1   = 0xFC;
	TL1   = 0x67;
	TR1   = 1;
}
void int_init()
{
	ET1 = 1;
	EA  = 1;
}
void refresh_led()
{
	  static uint8 j = 0;
		switch(j)
	   {
	   	case 0: ADDR0 = 0;ADDR1 = 0;ADDR2 = 0;break;
		case 1: ADDR0 = 1;ADDR1 = 0;ADDR2 = 0;break;
		case 2: ADDR0 = 0;ADDR1 = 1;ADDR2 = 0;break;
		case 3: ADDR0 = 1;ADDR1 = 1;ADDR2 = 0;break;
		case 4: ADDR0 = 0;ADDR1 = 0;ADDR2 = 1;break;
		case 5: ADDR0 = 1;ADDR1 = 0;ADDR2 = 1;break;
		case 6: ADDR0 = 0;ADDR1 = 1;ADDR2 = 1;break;
		case 7: ADDR0 = 1;ADDR1 = 1;ADDR2 = 1;break;
		default: break;
		}
		P0 = graph[j];
		if(7 == j++) j = 0;
		
	
}

 main()
{
	ENLED = 0; ADDR3 = 0;
	timer1_init();
	int_init();
	while(1);
	
}
void interrupt_timer1()	interrupt 3
{
	  TH1 = 0xFC;
	  TL1 = 0x67;
	  refresh_led();
						 
}