pwm.rar_pwm调速 仿真

#include<reg51.h> #include<stdio.h> #define uint unsigned int #define uchar unsigned char sbit ENA=P1^7; sbit led1=P0^0; sbit led2=P0^1; sbit led3=P0^2; uchar PWM=0x7f; void delay(uchar u) { uchar i,j,k; for(i=0;i<u;i++) for(j=0;j<u;j++) for(k=0;k<u;k++); } void INTT0() interrupt 0 { delay(10); if(PWM<255) PWM++; else PWM=255; } void INTT1() interrupt 2 { delay(10); if(PWM>0) PWM--; else PWM=0; } void timer0() interrupt 1 { TR1=0; //led=0; TH0=0xfc; TL0=0x18; TH1=PWM; TR1=1; ENA=0; } void timer1() interrupt 3 { TR1=0; //led=1; ENA=1; //TR0=1; } void init() { TMOD=0x21; // 定时器0为工作方式1 定时器1为工作方式2 //delay(100); TH0=0xfc; // 1ms定时 TL0=0x18; TH1=PWM; //脉宽调制 TL1=0; EA=1; IT0=1; IT1=1; EX0=1; EX1=1; ET0=1; ET1=1; TR0=1; } void main() { init(); while(1) { if(PWM<=120) led1=0; else led1=1; if(PWM>=135) led2=0; else led2=1; if(PWM==255 || PWM==0) led3=0; else led3=1; } }