【单片机期中测试】7.按键调光

#include<reg52.h>
sbit led=P2^0;
sbit key=P3^1;
unsigned int t=1,q=0;

void delay(unsigned int c)
{
   while(--c);
   
}
void delay2(unsigned int c1)
{
   for(;c1>0;c1--)
   {
   
		led=0;
		delay(t);
		led=1;
		delay(500-t);
	
   }
   
}

void main()
{
	unsigned int dir=0;
	while(1)
	{	 
		delay2(1);
		if(key==0&&q==0)
		{
			q=1;
			if(dir==0)
			t+=100;
			else
			t-=100;
			if(t>=400) dir=1;
			if(t<=100) dir=0;
			delay2(10);
		}
		if(key==1&&q==1)
		{
			q=0;
			delay2(10);
		}
	
	} 
}

• 接线：
• LED灯接P2^0
• 独立按键接P3^1