嵌入式系統(tǒng)WINCE的通用驅(qū)動程序

　　本應(yīng)用報告提出的基本概念和方法開發(fā)嵌入式系統(tǒng)觸摸屏、鍵盤、音頻和基于Windows CE的GPIO驅(qū)動程序（WinCE）操作系統(tǒng)（操作系統(tǒng)）。驅(qū)動程序沒有綁定到任何特定的處理器平臺。因此他們可以被稱為通用和可重用的任何主機處理器或平臺以最小的附加編碼。

　　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?。╣raphical， 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