本代碼實(shí)驗(yàn)環(huán)境為STM32F407,定時器主頻為84Mhz:

TIM3_Int_Init(500-1,84-1);//定時器中斷初始化

void TIM3_Int_Init(u16 arr,u16 psc)

{

TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;

NVIC_InitTypeDef NVIC_InitStructure;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE);? ///使能TIM3時鐘

TIM_TimeBaseInitStructure.TIM_Period = arr; //自動重裝載值

TIM_TimeBaseInitStructure.TIM_Prescaler=psc;? //定時器分頻

TIM_TimeBaseInitStructure.TIM_CounterMode=TIM_CounterMode_Up; //向上計數(shù)模式

TIM_TimeBaseInitStructure.TIM_ClockDivision=TIM_CKD_DIV1;?

TIM_TimeBaseInit(TIM3,&TIM_TimeBaseInitStructure);//初始化TIM3

TIM_ITConfig(TIM3,TIM_IT_Update,ENABLE); //允許定時器3更新中斷

TIM_Cmd(TIM3,ENABLE); //使能定時器3

NVIC_InitStructure.NVIC_IRQChannel=TIM3_IRQn; //定時器3中斷

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0x01; //搶占優(yōu)先級1

NVIC_InitStructure.NVIC_IRQChannelSubPriority=0x03; //子優(yōu)先級3

NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;

NVIC_Init(&NVIC_InitStructure);

}