自定义 Mini 键盘按键
galeki
posted @ 2010年5月28日 13:05
in 单片机
, 8452 阅读
手持 Mini 键盘虽然搞定了，但是设置起来比较麻烦，要切换按键配置的话，得重新编译硬件上的程序再烧进去才行。
当初也想做个切换开关在键盘上，并预置几种键盘配置，这样就可以通过切换开关来切换配置了。
不过后来发现自己白痴了，既然是 USB 的，为什么不通过电脑上的 GUI 客户端来设置呢。
于是快速的写好 GUI 端，硬件上也设置好，接收到传来的设置数据，就按照数据变更键盘的配置。
不过调试的时候发现无论如何都无法发送数据给硬件，Google 了一下发现问题严重了……
原因是，像 USB 键盘和鼠标这类 HID 输入设备，Windows 把它们注册为默认设备，并且截获了所有的数据传送，也禁止别的程序来打开硬件句柄，自然就无法发送和读取数据了。仔细想想也合理，否则任何一个第三方程序都可以随便的读取键盘和鼠标数据了。市场上很少见这类可以自由配置按键的键盘，也许就是这个原因吧。
之后又去翻了翻文档，发现似乎可以用 HID 中的 Feature Report 来交换数据，但是尝试了一下没有成功，难道最终要实现这个功能，还得去麻烦的给这个键盘写个驱动程序吗？
最后，用了一种妥协的办法：
硬件上电之后，先注册成 Custom HID 设备，这样就可以接受设置数据。在接受到设置数据之后，再软件模拟硬件从 USB 接口上拔下并插上的动作，这样操作系统就会再次枚举这个硬件，然后在这个时候，再把硬件注册成一个键盘，这样的代价就是第二次设置的时候需要再次插拔一下键盘。
尝试了一下，成功了~ 这样一个任何驱动也不用，即插即用的又可以配置按键的 Mini 手持键盘诞生了~~~ 
这样就可以随便调整键盘的按键了，比如 “拷贝 and 粘贴” 模式：
还可以 “切换程序 and 任务管理器/重启” 模式：
无敌方便~ 
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