定时器/PWM 计算器

/* STM32 定时器中断  时钟 72000000 Hz  目标 1.000000 s */
/* PSC=1098  ARR=65513  实际 999.998417 ms  误差 0.0002% */

void TIM3_Init(void)
{
    TIM_TimeBaseInitTypeDef TIM_TimeBaseStruct;
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);

    TIM_TimeBaseStruct.TIM_Prescaler     = 1098;   /* PSC */
    TIM_TimeBaseStruct.TIM_Period        = 65513;   /* ARR */
    TIM_TimeBaseStruct.TIM_ClockDivision = TIM_CKD_DIV1;
    TIM_TimeBaseStruct.TIM_CounterMode   = TIM_CounterMode_Up;
    TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStruct);

    TIM_ITConfig(TIM3, TIM_IT_Update, ENABLE);
    TIM_Cmd(TIM3, ENABLE);
}