android手机 usb hub,USB hub + android device

最新推荐文章于 2023-08-07 13:45:54 发布

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最新推荐文章于 2023-08-07 13:45:54 发布

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文章标签： android手机 usb hub

开发者Vladimir询问如何在Android设备上通过OTG连接一串活动USB集线器，并在USB访问模式下监控总线。他怀疑设备在USB主机模式下可能无法充电，因此倾向于使用USB访问模式进行通信。已查阅官方文档，但不确定在主动USB集线器的情境下如何实现。寻求帮助以确定如何在这样的设置中识别和通信外部设备。

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developers!

I have to connect active (powered from the outlet) hub to android device that supports otg. Actually there will be not one hub, but the cascade of 5 hubs connected one by another. So there will be several usb busses.

I'd like to ask if it's possible to monitor the bus in the USB accessory mode? This is preferred because I suspect the device will not charge in the usb host mode.

I've read documentation from here http://developer.android.com/guide/topics/connectivity/usb/accessory.html

It tells that usb host mode is used when I need to enumerate devices.

But I can communicate with another accessories. Then I have to know their descriptors hence I have to know that accessory was attached. But I'm not sure how to construct this in context of active usb hub.

Could anyone please help with that?

Regards, Vladimir.