定时器中断实现的步骤

①使能定时器时钟

RCC_APB1PeriphClockCmd();

②初始化定时器，配置ARR,PSC

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();

定时器参数初始化：

void TIM_TimeBaseInit(TIM_TypeDef*TIMx,TIM_TimeBaseInitType*TIM_TimeBaseInitStruct);

typedef struct

{

uint16_t TIM_Prescaler;

uint16_t TIM_CounterMode;

uint16_t TIM_Period;

uint16_t TIM_ClockDivision;

uint8_t TIM_RepetitionCounter;

}TIM_TimeBaseInitTypeDet;

TIM_TimeBaseStructure.TIM_Period=4999;

TIM_TimeBaseStructure.TIM_Prescaler=7199;

TIM_TimeBaseStructure.TIM_ClockDivision=TIM_CKD_DIV1;

TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_up;

TIM_TimeBaseInit(TIM3,&TIM_TimeBaseStructure);