PWM调速风扇源码（基于51单片机）

#include <STC15F2K60S2.H> #include <string.h> #include <stdio.h> #include <stdlib.h> #include <string.h> sbit TXD1 = P5^1; sbit RXD1 = P5^0; sbit JDQ1=P4^5; sbit JDQ2=P2^6; sbit PWM1=P3^6; sbit CPU= P3^3; sbit SD=P2^3; sbit IO0=P2^4; void PWM_Init(); void PWM_OUT(); void PWM_OUT_OFF(); void High_speed(); void Low_speed(); void delay_ms(); void delay_ms(unsigned int n) { unsigned int i,j; for(i=0;i<n;i++) for(j=0;j<1000;j++); } void main(void) { P0M1 = 0; P0M0 = 0; P1M1 = 0; P1M0 = 0; P2M1 = 0; P2M0 = 0; P3M1 = 0; P3M0 = 0; P4M1 = 0; P4M0 = 0; P5M1 = 0; P5M0 = 0; P6M1 = 0; P6M0 = 0; P7M1 = 0; P7M0 = 0; EA = 1; IO0=0; PWM_Init(); P7M0 |= 0x07; P7M1 |= 0x00; P3M0 |= 0x80; JDQ1=0; JDQ2=0; while (1) { High_speed(); delay_ms(5000);//延时5秒 Low_speed(); delay_ms(5000);//延时5秒 } } void PWM_Init() { CMOD=0x80; CCON = 0; CL = 0; CH = 0; CCAPM1=0x42; AUXR1 |=0x10; PCA_PWM1&=0x3F; CR=1; PWM_OUT_OFF(); } void PWM_OUT(char pulse_width) { SD=0; CCAP1H = CCAP1L = pulse_width; } void PWM_OUT_OFF() { SD=0;PCA_PWM0 |= (1<<0); CCAP1L = 0xFF; } void High_speed()//风扇高速 { PWM_OUT(0xFF); } void Low_speed()//风扇低速 { PWM_OUT(0X20); }