Stm32 L9110驱动风扇

一.原理图
 

二.示例代码
 

#include "pwm.h"


//PWM输出初始化
//arr：自动重装值
//psc：时钟预分频数
void TIM_PWM_Init(u16 arr,u16 psc)
{  
	GPIO_InitTypeDef GPIO_InitStructure;
	TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
	TIM_OCInitTypeDef  TIM_OCInitStructure;

	RCC_APB1PeriphClockCmd(UserPeriph_ADCx, ENABLE);// 
 	RCC_APB2PeriphClockCmd(UserPeriph_GPIOx , ENABLE);  //使能GPIO外设时钟使能
	                                                                     	

   //设置该引脚为复用输出功能,输出TIM1 CH1的PWM脉冲波形
	GPIO_InitStructure.GPIO_Pin = UserPeriph_PINx; //TIM_CH1
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;  //复用推挽输出
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_Init(UserGPIOx, &GPIO_InitStructure);

	
	TIM_TimeBaseStructure.TIM_Period = arr; //设置在下一个更新事件装入活动的自动重装载寄存器周期的值	 80K
	TIM_TimeBaseStructure.TIM_Prescaler =psc; //设置用来作为TIMx时钟频率除数的预分频值  不分频
	TIM_TimeBaseStructure.TIM_ClockDivision = 0; //设置时钟分割:TDTS = Tck_tim
	TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  //TIM向上计数模式
	TIM_TimeBaseInit(UserTIMEx, &TIM_TimeBaseStructure); //根据TIM_TimeBaseInitStruct中指定的参数初始化TIMx的时间基数单位

 
	TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; //选择定时器模式:TIM脉冲宽度调制模式2
	TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //比较输出使能
	TIM_OCInitStructure.TIM_Pulse = 0; //设置待装入捕获比较寄存器的脉冲值
	TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //输出极性:TIM输出比较极性高
	TIM_OC3Init(UserTIMEx, &TIM_OCInitStructure);  //根据TIM_OCInitStruct中指定的参数初始化外设TIMx

  TIM_CtrlPWMOutputs(UserTIMEx,ENABLE);	//MOE 主输出使能	

	TIM_OC3PreloadConfig(UserTIMEx, TIM_OCPreload_Enable);  //CH1预装载使能	 
	
	TIM_ARRPreloadConfig(UserTIMEx, ENABLE); //使能TIMx在ARR上的预装载寄存器
	
	TIM_Cmd(UserTIMEx, ENABLE);  //使能TIM1
}

#ifndef __PWM_H
#define __PWM_H
#include "sys.h"


#define UserTIMEx TIM3
#define UserPeriph_ADCx RCC_APB1Periph_TIM3
#define UserPeriph_GPIOx RCC_APB2Periph_GPIOB
#define UserGPIOx GPIOB
#define UserPeriph_PINx GPIO_Pin_0

#define close 100
#define one_step 80
#define two_step 60
#define three_step 40
#define four_step 20

void TIM_PWM_Init(u16 arr,u16 psc);

#endif

    TIM_PWM_Init(100,10);

    switch(pwm){
        case 0: TIM_SetCompare3(TIM3,close); break;
        case 1: TIM_SetCompare3(TIM3,one_step); break;
        case 2: TIM_SetCompare3(TIM3,two_step); break;
        case 3: TIM_SetCompare3(TIM3,three_step); break;
        case 4: TIM_SetCompare3(TIM3,four_step); break;
    }

三.注意点

PB0 占空比 为 100 关闭
pB1 占空比 为0 关闭