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请教关于2538串口转usb通信问题

目前2538协调器和网关采用串口通信,波特率为115200,为了提高通信速率,打算改为usb通信,现有几个问题想请教论坛的大牛们,如下:

1.是否有必要改为usb通信,通信速率最高是可以达到64kb/s吗?

2.如有必要更改,想请教下如何更改呢,有便捷的方案吗?

3.是选择usb-hid还是usb-cdc如何选择,有推荐吗?

谢谢各位,还望不吝赐教!