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我在T0_EXT（PA7）上装了一个按键，每次按键触发CAPIF中断好几次，并且捕获值一直为零

主函数代码如下：int32_t main(void)
{        

    //初始始化部份省略
    NVIC_EnableIRQ(TMR0_IRQn);
    tiMER_Open(TIMER0, TIMER_CONTINUOUS_MODE, 1);
    TIMER_SET_PRESCALE_VALUE(TIMER0, 0);
    TIMER_SET_CMP_VALUE(TIMER0, 0xFFFFFF);
    TIMER_EnableEventCounter(TIMER0, TIMER_COUNTER_FALLING_EDGE);//使能事件计        数模式
    TIMER_EnableCapture(TIMER0, TIMER_CAPTURE_FREE_COUNTING_MODE, TIMER_CAPTURE_FALLING_EDGE);//使能捕获模式
    TIMER_EnableCaptureDebounce(TIMER0);    TIMER_EnableInt(TIMER0);
    TIMER_EnableCaptureInt(TIMER0);               
    TIMER_Start(TIMER0);

    for(;;);
    return 0;
}

中断函数
static int cnt=0;
void TMR0_IRQHandler(void)
{
    if(TIMER_GetCaptureIntFlag(TIMER0) == 1)
    {
        uint32_t au32CAPValue;
        /* Clear Timer0 capture trigger interrupt flag */        
        au32CAPValue = TIMER_GetCaptureData(TIMER0)
        TIMER_ClearCaptureIntFlag(TIMER0);
        printf("capture int_cnt=%d , captureVal=%d n",cnt++,au32CAPValue);        
                        
    }
}