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这个截图是两个430IIC通讯时示波器抓取的信号图，两个430 一个做IIC 主机，一个做IIC从机，代码用的ti官方提供的代码。
问题是：为什么iic 主机给出地址信号后等待了一段时间才收到外设的ack信号？
