STM32F103高级定时器定时器1输入捕获问题

Timothyhth · 发表于 2018-1-10 23:52:33

教程中采用定时器2输入捕获的，我是根据教程进行了修改，可捕获不到，我知道高级定时器和通用定时器有些不同，但不是很了解，求大神帮忙看看程序有什么问题？

TIM_ICInitTypeDef  TIM1_ICInitStructure;

void TIM1_Cap_Init(u16 arr,u16 psc)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
NVIC_InitTypeDef NVIC_InitStructure;

RCC_APB1PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

GPIO_InitStructure.GPIO_Pin  = GPIO_Pin_11;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_ResetBits(GPIOA,GPIO_Pin_11);

TIM_TimeBaseStructure.TIM_Period = arr;
TIM_TimeBaseStructure.TIM_Prescaler =psc;
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);

TIM1_ICInitStructure.TIM_Channel = TIM_Channel_4;
    TIM1_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;
    TIM1_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;
    TIM1_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;
    TIM1_ICInitStructure.TIM_ICFilter = 0x00;
    TIM_ICInit(TIM1, &TIM1_ICInitStructure);

NVIC_InitStructure.NVIC_IRQChannel = TIM1_CC_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

TIM_ITConfig(TIM1,TIM_IT_CC4,ENABLE);

  TIM_Cmd(TIM1,ENABLE );

}

u8 a=0;

void TIM1_CC_IRQHandler(void)
{
if (TIM_GetITStatus(TIM1, TIM_IT_CC4) != RESET)
{
a++;
LED1=-LED1;

}
  TIM_ClearITPendingBit(TIM1, TIM_IT_CC4);

}