led.c

来自「手把手教你单片机」· C语言 代码 · 共 25 行

#include <reg52.h>
typedef  unsigned char   uint8;
typedef  unsigned int    uint16;
sbit LED = P0^0;
sbit ENLED = P1^4;
sbit ADDR0 = P1^0;
sbit ADDR1 = P1^1;
sbit ADDR2 = P1^2;
sbit ADDR3 = P1^3;
main()
{
	uint8 j = 8;
	uint16 i;
	ENLED = 0;	ADDR3 = 1;
	ADDR0 = 0; ADDR1 = 1; ADDR2 = 1; 
	while(1)
	{
		P0 = ~(1 << --j);  
		for(i=0; i<20000; i++);
		if(0 == j)
		    {
				j = 8;
			} 
	}
}