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发明公开
CN108459982A 通信设备和USB与串口的切换方法 有权 转让

通信设备和USB与串口的切换方法
摘要：
本发明公开了一种通信设备和USB与串口的切换方法，所述通信设备包括主处理器和USB端口，主处理器包括USB单元和UART单元，还包括连接于主处理器和USB端口之间的开关单元，开关单元用于：检测USB端口的ID管脚的电平信号；当电平信号为第一电平信号时，将USB端口连接至USB单元；当电平信号为第二电平信号时，将USB端口连接至UART单元。从而，通过开关单元检测USB端口的ID管脚的电平信号，根据电平信号的变化来进行USB与串口的切换，实现了通过硬件方式实现USB与串口的自动切换。切换过程中，不需要软件做额外干预，无需占用软件资源，减少了处理器的工作量，降低了切换的复杂性，也无需用户进行手动操作，提高了操作的便捷性以及设备的智能化水平。
摘要（英）：

The invention discloses a method for switching communication equipment and USB with a serial port. The communication equipment comprises a main processor and a USB port. The main processor comprises aUSB unit, a UART unit and a switch unit which is connected between the main processor and the USB port. The switch unit is used for detecting a level signal of an ID pin of the USB port; connecting the USB port with the USB unit when the level signal is a first level signal; and connecting the USB port with the UART unit when the level signal is a second level signal. Therefore, the level signalof the ID pin of the USB port is detected through the switch signal, and switching between the USB and the serial port is performed according to the change of the level signal, thereby realizing automatic switching between the USB and the serial port through a hardware mode. In a switching process, additional intervention of software is not required, thereby realizing no requirement for software resource occupation, reducing processor workload, reducing switching complexity, realizing no requirement for manual operation of a user, improving convenience in operation and intelligence level of equipment.

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