14.c

来自「用在51系列单片机上的,周期为5S,1/4占空比软件」· C语言 代码 · 共 81 行

#include <reg51.h>
#include <stdio.h>

#define TH 0x43				//11.0592M
#define TL 0x54

sbit KEY0=P2^2;
sbit KEY1=P2^3;
sbit OUT0=P1^1;
sbit OUT1=P1^0;
int r,zhuangtai,KEYR;

void KEY(void)
{	
	while (1)
	{
		if (KEY0==0)
		{
			 KEYR=0xff;
		}
		if (KEY1==0)
		{
			KEYR=0xff;
		}
	}
}

void timer0(void) interrupt 1
{
	TR0=0;
	TH0=TH;
	TL0=TL;
	TR0=1;

	if (KEYR==0)
	{
		OUT0=1;
		OUT1=0;
	   }

  	if (KEYR!=0)
	{
   		while (!r--==1)
		{	
			if (zhuangtai==1)
			{
				OUT0=1;
				OUT1=0;
				zhuangtai=0;
				r=160;
			}
			else if (!zhuangtai==1)
			{
				OUT0=0;
				OUT1=1;
				zhuangtai=1;
				r=30;
			}
		}
	}	
}
		
void main(void)
{
	P0=0;
	P1=0xfe;
	P2=0;
	P3=0;
	r=30;
	zhuangtai=1;
	KEYR=0xff;
	IE=0x82;
	TMOD=0x01;
	TH0=TH;
	TL0=TL;
	TR0=1;
	KEY();
}