STM32F4——定时器原理及应用中断、输入捕获、PWM输出

中断 ,允许CC1IE捕获中断 TIM_Cmd(TIM5,ENABLE ); //使能定时器5NVIC_InitStructure.NVIC_IRQChannel = TIM5_IRQn;NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=2;//抢占优先级3NVIC_InitStructure.NVIC_IRQChannelSubPriority =0; //子优先级3NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道使能NVIC_Init(&NVIC_InitStructure); //根据指定的参数初始化VIC寄存器、 }

九、相关初始化实例——PWM输出

//TIM14 PWM部分初始化 //PWM输出初始化//arr：自动重装值//psc：时钟预分频数void TIM14_PWM_Init(u32 arr,u32 psc){		 					 //此部分需手动修改IO口设置GPIO_InitTypeDef GPIO_InitStructure;TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;TIM_OCInitTypeDef  TIM_OCInitStructure;RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM14,ENABLE);  	//TIM14时钟使能    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOF, ENABLE); 	//使能PORTF时钟	GPIO_PinAFConfig(GPIOF,GPIO_PinSource9,GPIO_AF_TIM14); //GPIOF9复用为定时器14GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;           //GPIOF9GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;        //复用功能GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;	//速度100MHzGPIO_InitStructure.GPIO_OType = GPIO_OType_PP;      //推挽复用输出GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;        //上拉GPIO_Init(GPIOF,&GPIO_InitStructure);              //初始化PF9TIM_TimeBaseStructure.TIM_Prescaler=psc;  //定时器分频TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up; //向上计数模式TIM_TimeBaseStructure.TIM_Period=arr;   //自动重装载值TIM_TimeBaseStructure.TIM_ClockDivision=TIM_CKD_div1; TIM_TimeBaseInit(TIM14,&TIM_TimeBaseStructure);//初始化定时器14//初始化TIM14 Channel1 PWM模式	 TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; //选择定时器模式:TIM脉冲宽度调制模式2TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //比较输出使能TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low; //输出极性:TIM输出比较极性低TIM_OC1Init(TIM14, &TIM_OCInitStructure);  //根据T指定的参数初始化外设TIM1 4OC1TIM_OC1PreloadConfig(TIM14, TIM_OCPreload_Enable);  //使能TIM14在CCR1上的预装载寄存器TIM_ARRPreloadConfig(TIM14,ENABLE);//ARPE使能 TIM_Cmd(TIM14, ENABLE);  //使能TIM14										  }