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C6678 GPIO中断响应时间大概是多少？直接映射到系统中断的中断响应时间是不是比映射到片内的中断响应时间要短？
具体时间没有测量过，有些中断是路由到chip interrupt controller需经过二次映射，有些是直接路由到core interrupt controller，直接路由到core INTC的是要快些。你可以用STK中的GPIO例程测试一下。
