51单片机PWM波调光

来源：互联网发布：端口映射端口号编辑：程序博客网时间：2024/05/17 04:45

#include <reg51.h>sbit LED0=P1^0;                                                     // 用sbit 关键字 定义 LED到P1.0端口void Delay(unsigned int t); //函数声明void main (void){              unsigned int CYCLE=600,PWM_LOW=0;                           //定义周期并赋值P1=0xFF;                                                     //关闭所有流水灯while (1)                                                                    //主循环{LED0=1;Delay(60000); for(PWM_LOW=1;PWM_LOW<CYCLE;PWM_LOW++){ //PWM_LOW表示低电平时间，这个循环中低电平时长从1累加到CYCLE（周期）的值，即600次LED0=0;        //点亮LED  Delay(PWM_LOW);//延时长度，600次循环中从1加至599LED0=1;        //熄灭LEDDelay(CYCLE-PWM_LOW);//延时长度，600次循环中从599减至1}LED0=0;for(PWM_LOW=CYCLE-1;PWM_LOW>0;PWM_LOW--)//与逐渐变亮相反的过程{LED0=0;Delay(PWM_LOW);LED0=1;Delay(CYCLE-PWM_LOW);}}}void Delay(unsigned int t)                                                  //延时时(t*10)us{while(--t);}

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