我是用了定时器2的2通道产生40KHZ的方波（占空比50%）,然后定时器2的1通道和3通道去捕获这个波形，现在是3能捕获到，1都捕获不到，请问是什么问题吗？
void TIM2_IRQHandler(void) __attribute__((interrupt("WCH-Interrupt-fast")));
/*********************************************************************
* @fn TIM1_CC_IRQHandler
*
* @brief This function handles TIM1 Capture Compare Interrupt exception.
*
* @return none
*/
// 定时器2中断服务函数
void TIM2_IRQHandler(void)
{
if(TIM_GetITStatus(TIM2, TIM_IT_CC1)!= RESET)
{
// 捕获到CH1通道事件，记录当前计数器的值
capture_value1 = TIM_GetCapture1(TIM2);
printf("capture_value1:%d\r\n",capture_value1);
TIM_ClearITPendingBit(TIM2, TIM_IT_CC1);
}
if(TIM_GetITStatus(TIM2, TIM_IT_CC3)!= RESET)
{
// 捕获到CH3通道事件，记录当前计数器的值
capture_value3 = TIM_GetCapture3(TIM2);
printf("capture_value3:%d\r\n",capture_value3);
TIM_ClearITPendingBit(TIM2, TIM_IT_CC3);
}
TIM_ClearITPendingBit(TIM2, TIM_IT_Update); //清除中断标志位
}
void TIM2_Init(uint16_t arr, uint16_t psc,uint16_t ccp)
{
GPIO_InitTypeDef GPIO_InitStructure = {0};
TIM_ICInitTypeDef TIM_ICInitStructure = {0};
TIM_OCInitTypeDef TIM_OCInitStructure= {0};
TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure = {0};
NVIC_InitTypeDef NVIC_InitStructure = {0};
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC | RCC_APB2Periph_GPIOD, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2 ,ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3; //配置PD3引脚
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //设置为复用推挽输出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;//设置输出速度：30MHz
GPIO_Init(GPIOD, &GPIO_InitStructure ); //GPIO初始化
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;//PC0 输入捕获
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOC, &GPIO_InitStructure);
GPIO_ResetBits(GPIOC, GPIO_Pin_0);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;//PD4 输入捕获
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOD, &GPIO_InitStructure);
GPIO_ResetBits(GPIOD, GPIO_Pin_4);
TIM_TimeBaseInitStructure.TIM_Period = arr;
TIM_TimeBaseInitStructure.TIM_Prescaler = psc;
TIM_TimeBaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;
//TIM_TimeBaseInitStructure.TIM_RepetitionCounter = 0x00;
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseInitStructure);
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2; //指定TIM模式
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;//指定TIM输出比较状态，即使能比较输出
TIM_OCInitStructure.TIM_Pulse = ccp; //指定要加载到捕获比较寄存器中的脉冲值。
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //指定输出极性。
TIM_OC2Init(TIM2, &TIM_OCInitStructure ); //根据TIM_OCInitStruct中指定的参数初始化TIM2 Channel2。
TIM_CtrlPWMOutputs(TIM2, ENABLE ); //启用定时器2PWM输出
TIM_OC2PreloadConfig(TIM2, TIM_OCPreload_Disable);//使能CCR1上的TIM2外设预加载寄存器
TIM_ARRPreloadConfig(TIM2, ENABLE ); //使能ARR上TIM2外设预加载寄存器
// 配置CH2通道产生PWM信号
TIM_ICInitStructure.TIM_Channel = TIM_Channel_1|TIM_Channel_3;
TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;
TIM_ICInitStructure.TIM_ICFilter = 0x00;
TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;
TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;
TIM_ICInit(TIM2, &TIM_ICInitStructure);
NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
TIM_ITConfig(TIM2, TIM_IT_CC1 | TIM_IT_CC3, ENABLE);
TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);
TIM_Cmd(TIM2, ENABLE);
}
老哥，这里不能这么写，两个通道要分开，看下TIM_ICInit()里面的内容就知道了