假设定时器TIM2的预分频值为PrescalerValue,计数初值为ARRValue,请完善定时器初始化程序。 TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE); TIM_TimeBaseStructure.TIM_Prescaler = ________________; TIM_TimeBaseStructure.TIM_Period =________________; TIM_TimeBaseStructure.TIM_ClockDivision = 0; TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; TIM_TimeBaseInit(TIM2, ____________________); TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE); TIM_Cmd(TIM2, ENABLE);