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am335x中断问题



问题:串口发送数据0x55,然后使用中断判断低电平的次数。发现IO引脚产生的中断次数为2.

请问一下:是IO响应不了中断太快的频率吗?//使用示波器参考IO引脚明明是有多次的低电平的。

ret = request_irq(irq, gpio_rx_irq, IRQF_TRIGGER_LOW, "RX", NULL);  

有没遇到类似问题的。