ICS 中的 USB HOST 模式
我正在尝试将 USB 传感器（请参阅 Toradex）连接到运行 Android 4.0.3 的 Android 手机（Desire Z）。
为了测试这一点，我编写了一个小应用程序来枚举连接的设备。
这应该实现 USB 主机模式并为 USB 传感器（HID）供电......但事实并非如此。
我有一条 USB OTG 电缆，现在，当我连接电缆时，状态栏中会出现一个小图标（汽车模式）。
我很失望，因为我等待这个功能有一段时间了……
有什么想法吗？我读了几乎所有与此相关的内容（斯文的作品等等），但我可能错过了一些东西......
谢谢！
I'm trying to connect a usb sensor (see Toradex) to an android phone (Desire Z) running android 4.0.3.
To test this, I wrote a small app to enumerate the attached device(s).
This supposed to have USB HOST mode implemented and to power the usb sensor (HID)... but it doesn't.
I got a USB OTG cable and now, when I attach the cable, a small icon appears in the status bar (car mode).
I'm disappointed since I waited for this feature for awhile now...
Any thoughts? I read almost everything out there related to this (Sven work and whatnot) but I might have missed something...
Thanks!
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在过去的一年半里，我做了很多工作来构建定制的 Android 平台。有些是在 Froyo 的领导下，但大部分是在 Gingerbread 上。我添加的硬件大部分位于 UART 或 USB 上，这正是您想要做的。不幸的是，在 Android 设备上添加 USB 外围设备并不像在 PC 或 MAC 上那么容易。 PC 和 MAC 拥有几乎无限的内存空间（硬盘）。它们可以容纳大量设备的驱动程序。这使得自动检测和自动加载驱动程序成为可能。在 Android 设备上，它要精简得多，只需将所需的驱动程序存储在设备上。每次添加新设备时，我都必须为我的平台编译驱动程序并在配置中进行一些修改。还可以将驱动程序作为模块加载，而不是与内核一起编译（提供 file.ko 输出）。尽管如此，驱动程序必须已相应编写。但是，您必须通过修改需要root权限的“init.rc”来安装它。
这里有一些关于 Android 驱动程序的问题/答案的链接。这应该会给你更多的信息：
USB触摸屏驱动程序
希望它有帮助，但不幸的是，它很安静很多工作做做。
I have worked a lot in the past year and a half to build custom android platform. Some was under Froyo but mostly on Gingerbread. Most on the hardware I added was on either a UART or on USB, which is what you want to do. Unfortunately, it is not as easy to add a USB peripheral on an Android device than on a PC or a MAC. PCs and MACs have virtually unlimited memory space (hard drive). They can hold the drivers of a very large number of devices. That makes it possible to do auto-detection and automatic loading of drivers. On an Android device, it is a lot more lean therefor, just the required drivers are stored on the device. Every time I added a new device, I had to compile the driver for my platform and make some modification in my configuration. It is also possible to load the driver as a module instead of compiling it with the kernel (gives a file.ko output). Although, the driver must have been written accordingly. But, you will have to install it by modifying the "init.rc" which requires root privilege.
here is a few link of question/answer about about drivers in Android. That should give you a little bit more info:
USB touchscreen driver
Hope it helps but unfortunately, it is quiet a lot of work do do.