Stm32定时器+PWM

以timer3为例，周期1KHz，1ms

void time3_init(void)
{
    TIM_TimeBaseInitTypeDef TIM_INIT;
    NVIC_InitTypeDef NVIC_INIT;
    
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE);
    

　　// TIM_Period  =（时钟频率 / 周期） - 1
    TIM_INIT.TIM_Period = (42000000 / 1000) - 1;
    TIM_INIT.TIM_Prescaler = 0;
    TIM_INIT.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_INIT.TIM_ClockDivision = TIM_CKD_DIV1;
    TIM_TimeBaseInit(TIM3,&TIM_INIT);
    
    TIM_ITConfig(TIM3,TIM_IT_Update,ENABLE);
    
    NVIC_INIT.NVIC_IRQChannel=TIM3_IRQn;
    NVIC_INIT.NVIC_IRQChannelPreemptionPriority=1;
    NVIC_INIT.NVIC_IRQChannelSubPriority=1;
    NVIC_INIT.NVIC_IRQChannelCmd=ENABLE;
    NVIC_Init(&NVIC_INIT);
    
    TIM_Cmd(TIM3,ENABLE);
}

void TIM3_IRQHandler(void)
{
    if(TIM_GetITStatus(TIM3,TIM_IT_Update)==SET) //溢出中断
    {
        LED5=!LED5;//led5
    }
    TIM_ClearITPendingBit(TIM3,TIM_IT_Update);  //清除中断标志位
}

 

PWM

void pwm12_ch1_init(u32 arr,u32 psc)
{
    GPIO_InitTypeDef GPIO_init;
    TIM_TimeBaseInitTypeDef TIM_INIT;
    TIM_OCInitTypeDef timoc_init;
    
    //使能相应时钟
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB,ENABLE);
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM12,ENABLE);
    
    GPIO_PinAFConfig(GPIOB,GPIO_PinSource14,GPIO_AF_TIM12);
    
    //初始化GPIO参数
    GPIO_init.GPIO_Mode=GPIO_Mode_AF;
    GPIO_init.GPIO_Pin=GPIO_Pin_14;
    GPIO_init.GPIO_OType=GPIO_OType_PP;
    GPIO_init.GPIO_PuPd=GPIO_PuPd_DOWN;
    GPIO_init.GPIO_Speed=GPIO_Speed_100MHz;
    GPIO_Init(GPIOB,&GPIO_init);   //位置在stm32f4xx.gpio.h
    
    //设置timer12的ARR和PSC参数，用于控制PWM的周期
    TIM_INIT.TIM_Period=arr;
    TIM_INIT.TIM_Prescaler=psc;
    TIM_INIT.TIM_CounterMode=TIM_CounterMode_Up;
    TIM_INIT.TIM_ClockDivision=TIM_CKD_DIV1;
    TIM_TimeBaseInit(TIM12,&TIM_INIT);
    
    //设置PWM通道
    timoc_init.TIM_OCMode=TIM_OCMode_PWM1;
    timoc_init.TIM_OutputState=TIM_OutputState_Enable;
    timoc_init.TIM_OCPolarity=TIM_OCPolarity_High;//TIM_OCPolarity_Low;
    TIM_OC1Init(TIM12,&timoc_init);
    
    //使能预装载寄存器
    TIM_OC1PreloadConfig(TIM12,TIM_OCPreload_Enable);
    
    //使能ARPE
    TIM_ARRPreloadConfig(TIM12,ENABLE);
    
    TIM_Cmd(TIM12,ENABLE);
    
}

 

来源：https://www.cnblogs.com/longxi/p/12031407.html