pwm脉冲调制延时法

会员952544

功能：延时PWM脉冲调节LED灯的亮度 晶振：11.0592HZM


修改：无
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#include<reg52.h>
#define uint unsigned int
#define uchar unsigned char
sbit LED=P1^0;
void delay_us(uint z);
void main()
{
uint pwm=400;
uint pwm_low;
while(1)
{
LED=0; 亮
delay_us(60000);
for(pwm_low=1;pwm_lowpwm;pwm_low++) 渐灭 {
LED=1;
delay_us(pwm_low);
LED=0;
delay_us(pwm-pwm_low);
}
LED=1; 灭
delay_us(60000);
for(pwm_low=1;pwm_lowpwm;pwm_low++) 渐亮 {
LED=0;
delay_us(pwm_low);
LED=1;
delay_us(pwm-pwm_low);
}
}
}
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void delay_us(uint z) {
while(z--); }