有关定时器3的输入捕获

只看该作者 · 2015-5-10 21:37

按如下配置了，但是进不了中断，用示波器看了PA7管脚有红外波形，不知道问题出在哪里
void time_Config(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;
TIM_ICInitTypeDef  TIM_ICInitStructure;

/* TIM3 clock enable */
   RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);

/* GPIOA clock enable */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);

   //Tim3,AF功能配置
GPIO_PinAFConfig(GPIOA, GPIO_PinSource7, GPIO_AF_1);

/* TIM3 channel 2 pin (PA.7) configuration */
GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_7;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);

/* Enable the TIM3 global Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPriority = IRQChannelPriority_TIM3;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

TIM_TimeBaseInitStructure.TIM_Prescaler = 30;
TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Down;
TIM_TimeBaseInitStructure.TIM_Period = 65535;
TIM_TimeBaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseInitStructure.TIM_RepetitionCounter = 0;
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseInitStructure);

TIM_ICInitStructure.TIM_Channel = TIM_Channel_2;
TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Falling;
TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;
TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;
TIM_ICInitStructure.TIM_ICFilter = 0x0;
TIM_ICInit(TIM3, &TIM_ICInitStructure);

TIM_SetCounter(TIM3, 65535);

/* Enable the CC2 Interrupt Request */
TIM_ITConfig(TIM3, TIM_IT_CC2, ENABLE);

/* TIM enable counter */
TIM_Cmd(TIM3, ENABLE);
}

void TIM3_IRQHandler(void)
{
if(TIM_GetITStatus(TIM3, TIM_IT_CC2) == SET)
{
IC3ReadValue = TIM_GetCapture2(TIM3);
TIM_SetCounter(TIM3, 65535);
/* Clear TIM3 Capture compare interrupt pending bit */
TIM_ClearITPendingBit(TIM3, TIM_IT_CC2);
}
}