嵌入式系统WINCE的通用驱动程序

　　本应用报告提出的基本概念和方法开发嵌入式系统触摸屏、键盘、音频和基于Windows CE的GPIO驱动程序（WinCE）操作系统（操作系统）。驱动程序没有绑定到任何特定的处理器平台。因此他们可以被称为通用和可重用的任何主机处理器或平台以最小的附加编码。

　　The Windows CE device drivers model takes into consideration three types of drivers：

　　• Built−in drivers， also known as native device drivers. These drivers implement a custom　interface （known as the device driver interface， or DDI functions） specific to the feature it　implements. They are loaded by the graphical windowing events subsystem （GWES）　process， which is part of the Windows CE kernel. They are either dynamic library linked　（DLL） or libraries directly linked to the GWES. GWES manages all MMI subsystems　（graphical， user inputs， etc.）。 The typical built-in drivers are：

　　− Display driver

　　− Touchscreen driver

　　− Keyboard driver

　　− Mouse Driver

　　− LEDs drivers

　　• Installable drivers， also known as stream drivers. These drivers implement a standard IO　interface to be used for all types of IO devices. These drivers are mounted by device　manager either statically or dynamically. They are DLLs which must provide a ten-function　interface （Init， Deinit， Open， Close， Read， Write， Seek， IOControl， PowerUp， PowerDown）　and are configured in the registry. Consequently， a new stream driver can be easily added.　Examples of typical stream drivers are：

　　− Serial drivers

　　− Bus drivers

　　− Block drivers （for storage devices）

　　− Specific stream drivers