STM32 通用T2、T3、T4、T5定时器详解

定时器初始化配置

 void TIM3_Configuration(void)//1MS
 {
     TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;

         TIM_DeInit(TIM3);//开一下时钟再关闭
         /* 设置TIM2CLK 为 72MHZ */
     RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3 , ENABLE);

     /* 自动重装载寄存器周期的值(计数值) */
     TIM_TimeBaseStructure.TIM_Period=-;

     /* 累计 TIM_Period个频率后产生一个更新或者中断 */
     TIM_TimeBaseStructure.TIM_Prescaler= ;
         TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;/* 时钟预分频数为72 */
     TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up;
     TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);

     TIM_ClearFlag(TIM3, TIM_FLAG_Update);
         TIM_ITConfig(TIM3,TIM_IT_Update,ENABLE);
         TIM_ARRPreloadConfig(TIM3, ENABLE);
     TIM_Cmd(TIM3, ENABLE);                                                                        

 }

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 = ;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = ;
    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。