STM32定時器週期計算

STM32定時器週期計算

公式是：
((1+TIM_Prescaler )/時鐘)*(1+TIM_Period )     

F103配置生成1ms的時鐘((1+35 )/36M)*(1+999 ) = 1MS 

    

 

    TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
    NVIC_InitTypeDef NVIC_InitStructure;
    TIM_DeInit(TIM5);
    TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM5, ENABLE);
    TIM_TimeBaseStructure.TIM_Period = 999;
    //APB1最大時鐘36MHz， 36M/(35+1) = 1M hz
    TIM_TimeBaseStructure.TIM_Prescaler = 35;//最小1us
    TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseInit(TIM5, &TIM_TimeBaseStructure);     
    TIM_Cmd(TIM5, ENABLE);