下定時器初始化配置

1 void TIM3_Configuration(void)//1MS

2 {

3 TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;

4

5 TIM_DeInit(TIM3);//開一下時鐘再關閉

6 /* 設置TIM2CLK 為 72MHZ */

7 RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3 , ENABLE);

8

9

10 /* 自動重裝載寄存器周期的值(計數(shù)值) */

11 TIM_TimeBaseStructure.TIM_Period=1000-1;

12

13 /* 累計 TIM_Period個頻率后產(chǎn)生一個更新或者中斷 */

14 TIM_TimeBaseStructure.TIM_Prescaler= 71;

15 TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;/* 時鐘預分頻數(shù)為72 */

16 TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up;

17 TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);

18

19 TIM_ClearFlag(TIM3, TIM_FLAG_Update);

20 TIM_ITConfig(TIM3,TIM_IT_Update,ENABLE);

21 TIM_ARRPreloadConfig(TIM3, ENABLE);

22 TIM_Cmd(TIM3, ENABLE);

23

24 }

NVIC配置

void TIM3_NVIC_Configuration(void)

{

NVIC_InitTypeDef NVIC_InitStructure;

NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);

NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 3;

NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;

NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

NVIC_Init(&NVIC_InitStructure);

}

正常情況下是先配置好定時器參數(shù)設置，再配置NVIC中斷-》使能中斷。