STM32L151RDT6定时1s实际是2s是哪里配置有问题？

只看该作者 · 2018-9-3 12:26

TIM_Configturation(10000, 3200);//定时1s，正常这个是1s定时，但是实际上是正好2s。
//外接8MHz晶振，系统时钟是32MHz
void TIM_Configturation(u16 period, u16 prescaler)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
NVIC_InitTypeDef NVIC_InitStructure;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
TIM_TimeBaseStructure.TIM_Period = period-1;
TIM_TimeBaseStructure.TIM_Prescaler = prescaler-1;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;

TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
/* TIM IT enable */
TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);

/* TIM2 enable counter */
TIM_Cmd(TIM2, ENABLE);

/* Enable the TIM2 Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}