STM32 通用T2、T3、T4、T5定时器详解

下定时器初始化配置

1 void TIM3_Configuration(void)//1MS

2 {

3 TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;

4

5 TIM_DeInit(TIM3);//开一下时钟再关闭

6 /* 设置TIM2CLK 为 72MHZ */

7 RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3 , ENABLE);

8

9

10 /* 自动重装载寄存器周期的值(计数值) */

11 TIM_TimeBaseStructure.TIM_Period=1000-1;

12

13 /* 累计 TIM_Period个频率后产生一个更新或者中断 */

14 TIM_TimeBaseStructure.TIM_Prescaler= 71;

15 TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;/* 时钟预分频数为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);

}

正常情况下是先配置好定时器参数设置，再配置NVIC中断-》使能中断。