stm32输入捕获怎么编程

STM32的输入捕获可以使用定时器来实现。下面是一个简单的代码示例，用于实现STM32输入捕获：

首先，需要初始化定时器和GPIO引脚：

void TIM_Configuration(void)
{
    TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
    TIM_ICInitTypeDef TIM_ICInitStructure;
    GPIO_InitTypeDef GPIO_InitStructure;

    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    TIM_TimeBaseStructure.TIM_Period = 0xFFFF;
    TIM_TimeBaseStructure.TIM_Prescaler = 72 - 1;
    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_1;
    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 = 0x0;
    TIM_ICInit(TIM3, &TIM_ICInitStructure);

    TIM_Cmd(TIM3, ENABLE);
}

然后，可以通过中断处理程序来捕获输入信号：

void TIM3_IRQHandler(void)
{
    if (TIM_GetITStatus(TIM3, TIM_IT_CC1) != RESET)
    {
        TIM_ClearITPendingBit(TIM3, TIM_IT_CC1);
        uint16_t captureValue = TIM_GetCapture1(TIM3);
        printf("Input capture value: %d\n", captureValue);
    }
}

最后，需要在main函数中开启中断：

int main(void)
{
    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
    TIM_Configuration();
    NVIC_EnableIRQ(TIM3_IRQn);
    while (1);
}

这是一个简单的输入捕获例子，你可以根据实际需求进行修改和优化。