STM32F030 TIM输入捕获配置问题

JACK123 · 发表于 2019-6-5 17:22:10

现在项目需求正在调试STM32F030 TIM输入捕获可以按照官网的例子一步一步下来就是不进中断、
void TIM3_Init(void)
{
   NVIC_InitTypeDef NVIC_InitStructure;
  TIM_ICInitTypeDef  TIM_ICInitStructure;
  TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
GPIO_InitTypeDef  GPIO_InitStructure;
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);

RCC_AHBPeriphClockCmd( RCC_AHBPeriph_GPIOA, ENABLE);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_PinAFConfig(GPIOA, GPIO_PinSource7, GPIO_AF_1);
GPIO_Init(GPIOA, &GPIO_InitStructure);

NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

  TIM_TimeBaseStructure.TIM_Period = 65535;
  TIM_TimeBaseStructure.TIM_Prescaler = 19;//24ms
  TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
  TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);

  TIM_ICInitStructure.TIM_Channel = TIM_Channel_2;
  TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;
  TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;
  TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;
  TIM_ICInitStructure.TIM_ICFilter = 0x00;
  TIM_ICInit(TIM3, &TIM_ICInitStructure);

  TIM_ClearITPendingBit(TIM3,  TIM_IT_CC2);
  TIM_ITConfig(TIM3, TIM_IT_CC2, ENABLE);
  TIM_Cmd(TIM3, ENABLE);
}

中断服务函数

uint32_t q;

void TIM3_IRQHandler(void)
{
  if (TIM_GetITStatus(TIM3, TIM_IT_CC2) != RESET)
  {
  TIM_ClearITPendingBit(TIM3 , TIM_IT_CC2);
q++;

  }

}

求大神解惑