握手
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两个设备之间的初始协商，在数据传输开始前就速度、功率和协议达成一致。
当您插入线缆时，连接的设备会交换能力信息。USB PD握手协商电压和电流。HDMI握手交换EDID数据和HDCP密钥。握手失败通常是黑屏或设备无法全速充电的原因。