stm32f103RE有LSI校准的功能吗，为什么我按手册配置好了定时器，可是老是不进定时器中断
void TIM5_ConfigForLSI(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
TIM_ICInitTypeDef TIM_ICInitStructure;
/* Enable TIM5 clocks */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM5, ENABLE);
/* Deinitialize the TIM5 peripheral registers to their default reset values */
TIM_DeInit(TIM5);
/* Configure TIM5 prescaler */
TIM_PrescalerConfig(TIM5, 0, TIM_PSCReloadMode_Immediate);
/* Connect internally the TM5_CH4 Input Capture to the LSI clock output */
GPIO_PinRemapConfig(GPIO_Remap_TIM5CH4_LSI, ENABLE);
/* TIM5 configuration: Input Capture mode ---------------------
The LSI oscillator is connected to TIM5 CH4
The Rising edge is used as active edge,
The TIM5 CCR4 is used to compute the frequency value
------------------------------------------------------------ */
TIM_ICInitStructure.TIM_Channel = TIM_Channel_4;
TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;
TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;
TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV8;
TIM_ICInitStructure.TIM_ICFilter = 0;
TIM_ICInit(TIM5, &TIM_ICInitStructure);
/* Enable the TIM5 Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = TIM5_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
/* TIM10 Counter Enable */
TIM_Cmd(TIM5, ENABLE);
/* Reset the flags */
TIM5->SR = 0;
/* Enable the CC4 Interrupt Request */
TIM_ITConfig(TIM5, TIM_IT_CC4, ENABLE);
}
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