基于PWM的控制一个LED小灯的设计

#include

#define uint unsigned int

#define uchar unsigned char

sbit pwm=P1^0;

uint cycle,high,low;//cycle为一个周期的时间；high为高电平的时间；low为低电平的时间。

void delay(uint t)

{

while(t--);

}

void main()

{

cycle=800;

while(1)

{

for(high=1;high<=cycle;high++)

{

pwm=1;

delay(high);

pwm=0;

low=cycle-high;

delay(low);

}

high=1;

delay(60000);

}

}