stm32通用定时器中断实现步骤

1.使能定时器时钟

RCC_APB1PeriphClockCmd();//注意通用定时器挂在哪条总线上

2.初始化定时器，配置ARR,PSC

TIM_TimeBaseInit();

3.开启定时器中断，配置NVIC

void TIM_ITConfig();
NVIC_Init();

4.使能定时器

TIM_Cmd();

5.编写中断服务函数

TIMx_IRQHandler();

计算溢出时间和预分频系数等量之间的关系可由式子

Tout(溢出时间) = (ARR+1)(PSC+1)/Tclk

其中ARR自动装载值，PSC预分频系数，Tclk为输入时钟频率

例子：通过定时器中断配置，每500ms中断一次，然后中断服务函数中控制LED实现LED状态取反。

void TIM3_Int_Init(u16 arr,u16 psc)
{
    TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
	NVIC_InitTypeDef NVIC_InitStructure;

	RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); 
	TIM_TimeBaseStructure.TIM_Period = arr; 
	TIM_TimeBaseStructure.TIM_Prescaler =psc; 
	TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; 
	TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  
	TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); 
 
	TIM_ITConfig(TIM3,TIM_IT_Update,ENABLE );

	
	NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;
	NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;  
	NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;  
	NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
	NVIC_Init(&NVIC_InitStructure);  


	TIM_Cmd(TIM3, ENABLE); 				 
}

另外再编写中断服务函数即可，中断服务函数名为

void TIM3_IRQHandler(void) 

 

 

 

 

本文根据正点原子stm32系列教程所记录