基于WINCE6.0系统，SD卡和flash作为PC机的U盘

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基于WINCE6.0系统，SD卡和flash作为PC机的U盘

分类：? WINCE驱动开发2012-05-04 21:26? 181人阅读? 评论(0)? 收藏? 举报

********************************LoongEmbedded********************************

作者：LoongEmbedded(kandi)

时间：2012.05.04

类别：WINCE驱动开发

********************************LoongEmbedded********************************

根据客户的要求，希望我们WINCE设备可以作为PC机器的可移动磁盘，并且可以通过应用软件能够实现mass storage和ActiveSync的切换，那怎么实现这个功能呢：

1.???????系统组件

选择ActiveSync、mass storage和serial组件，如下图所示：

图1

2.???????驱动的支持以及需要注意的注册表项

我们先来看USB客户端驱动的注册表信息

IF BSP_USBFNCLASS == MASS_STORAGE

[HKEY_LOCAL_MACHINEDriversUSBFunctionDrivers]

????"DefaultClientDriver"=- ; erase previous default

????"DefaultClientDriver"="Mass_Storage_Class"

ENDIF BSP_USBFNCLASS

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[HKEY_LOCAL_MACHINEDriversUSBFunctionDriversMass_Storage_Class]

????"Dll"="usbmsfn.dll"

????"InterfaceSubClass"=dword:06

????"InterfaceProtocol"=dword:50

????"DeviceName"="DSK1:" ;?被映射为U盘的存储设备的设备名

????"FriendlyName"="Mass Storage";显示设备名

????"idVendor"=dword:045E;?Vendor ID，应该向USB组织申请

????"Manufacturer"="Generic Manufacturer (PROTOTYPE--Remember to change idVendor)";厂商命

????"idProduct"=dword:FFFF;?Product ID，由厂商定义

????"Product"="Generic Mass Storage (PROTOTYPE--Remember to change idVendor)";产品名

????"bcdDevice"=dword:0;设备的版本号

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[HKEY_LOCAL_MACHINEDriversUSBFunctionDriversRNDIS]

????"idVendor"=dword:0547

????"Manufacturer"=LOC_USBFN_RNDIS_MANUFACTURER

????"idProduct"=dword:2c2d

????"Product"=LOC_USBFN_RNDIS_PRODUCT

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[HKEY_LOCAL_MACHINEDriversUSBFunctionDriversSerial_Class]

????"FriendlyName"=LOC_USBFN_SERIAL_NAME

????"idVendor"=dword:045E

????"Manufacturer"=LOC_USBFN_SERIAL_MANUFACTURER

????"idProduct"=dword:00CE

????"Product"=LOC_USBFN_SERIAL_PRODUCT

????"Index"=dword:5

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[HKEY_CURRENT_USERControlPanelComm]

"Cnct"="`USB"

在上面的注册表信息中，如果要把SD卡或是flash分区作为PC机的可移动盘，一定要让"DeviceName"="DSK1:"中的1和SD卡驱动或是flash驱动的index一致，这样就可以实现这个功能了。

3.???????mass storage和ActiveSync切换

这个功能可以通过一个应用软件来实现，主要的工作如下：

⑴基于GUID调用FindFirstDevice函数获取到USB控制器驱动(比如s3c2450_usbfn.dll)的句柄。

⑵通过上面获取的驱动句柄，以控制码IOCTL_UFN_GET_CURRENT_CLIENT调用DeviceIoControl函数来获取当前已经加载的USB客户端驱动，然后以控制码IOCTL_UFN_CHANGE_CURRENT_CLIENT调用DeviceIoControl函数来切换USB客户端驱动(比如由mass storage切换为ActiveSync)。

⑶修改注册表信息，比如把"DefaultClientDriver"="Mass_Storage_Class"改为"DefaultClientDriver"="serial"

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具体的代码如下：

#define FILE_DEVICE_UNKNOWN?????????????0x00000022

#define METHOD_BUFFERED?????????????????0

#define FILE_ANY_ACCESS?????????????????0

#define CTL_CODE( DeviceType,Function,Method,Access ) (?????????????????

????((DeviceType) << 16) | ((Access) << 14) | ((Function) << 2) | (Method)

)

#define _UFN_ACCESS_CTL_CODE(_Function)??

????CTL_CODE(FILE_DEVICE_UNKNOWN,_Function,METHOD_BUFFERED,FILE_ANY_ACCESS)

???

#define IOCTL_UFN_GET_CURRENT_CLIENT????????????????_UFN_ACCESS_CTL_CODE(3)

#define IOCTL_UFN_CHANGE_CURRENT_CLIENT?????????????_UFN_ACCESS_CTL_CODE(4)

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#define UFN_CLIENT_NAME_MAX_CHARS 128

#define UFN_CLIENT_DESCRIPTION_MAX_CHARS 250

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typedef struct _UFN_CLIENT_INFO {

????TCHAR szName[UFN_CLIENT_NAME_MAX_CHARS];

????TCHAR szDescription[UFN_CLIENT_DESCRIPTION_MAX_CHARS];

} UFN_CLIENT_INFO,*PUFN_CLIENT_INFO;

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typedef struct _UFN_CLIENT_NAME {

????TCHAR szName[UFN_CLIENT_NAME_MAX_CHARS];

} UFN_CLIENT_NAME,*PUFN_CLIENT_NAME;

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static HKEY hOpenKey=NULL;

#define DRIVER_USB_KEY TEXT("DriversUSBFunctionDrivers")

#define DRIVER_USB_NAME TEXT("DefaultClientDriver")

#define DRIVER_USB_VALUE_SERIAL TEXT("Serial_Class")

#define DRIVER_USB_VALUE_STORAGE TEXT("Mass_Storage_Class")

HANDLE GetUfncontroller()

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{

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????HANDLE hUfn = NULL;

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DEVMGR_DEVICE_INFORMATION di;

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memset(&di,sizeof(di));

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di.dwSize = sizeof(di);

GUID guidUsbFn = { 0xE2BDC372,0x598F,0x4619,0xBC,0x50,0x54,0xB3,0xF7,0x84,0x8D,0x35 };

????HANDLE hf = FindFirstDevice(DeviceSearchByGuid,&guidUsbFn,&di);

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if (hf != INVALID_HANDLE_VALUE)

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{

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???hUfn = CreateFile(di.szBusName,GENERIC_READ,FILE_SHARE_READ,NULL,OPEN_EXISTING,NULL);

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CloseHandle(hf);

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}

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else

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{

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???hUfn = INVALID_HANDLE_VALUE;

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}

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return hUfn;

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}

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void CusbfunctionswitchDlg::OnBnClickedStorageActivesyncSwitch()

{

?????????// TODO: Add your control notification handler code here

?????????HANDLE hDisk = NULL;

?????????BOOL???fnTypeStorage = TRUE;

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?????????UFN_CLIENT_NAME uname;

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?????????UFN_CLIENT_INFO uinfo;

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?????????DWORD dwReturn = 0;

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?????????_tcscpy(uname.szName,L"Mass_Storage_Class");

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?????????hDisk = GetUfncontroller();

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?????????if (hDisk == INVALID_HANDLE_VALUE)

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?????????{

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?????????RETAILMSG(1,(TEXT("invalid usb handle,error = %d/r/n"),GetLastError()));

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?????????}

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?????????if (DeviceIoControl(hDisk,IOCTL_UFN_GET_CURRENT_CLIENT,&uinfo,sizeof(uinfo),&dwReturn,0) && (dwReturn == sizeof(uinfo)))

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?????????{

????????

?????????if (_tcscmp(L"Mass_Storage_Class",uinfo.szName) == 0)

?????????{

???????????????????_tcscpy(uname.szName,L"Serial_Class");

???????????????????fnTypeStorage = FALSE;

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?????????}

?????????else

?????????{

???????????????????fnTypeStorage = TRUE;

?????????}

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?????????}

?????????if (!DeviceIoControl(hDisk,IOCTL_UFN_CHANGE_CURRENT_CLIENT,&uname,sizeof(uname),NULL))

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?????????{

???????????????????RETAILMSG(1,(TEXT("deviceiocontrol failed,GetLastError()));

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?????????}

?????????else

?????????{

???????????????????LONG????lResult = 0;

??????????????????

???????????????????if(fnTypeStorage)

???????????????????{

???????????????????????????

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????????????????????????????lResult = RegOpenKeyEx( HKEY_LOCAL_MACHINE,DRIVER_USB_KEY,&hOpenKey );

???????????????????????????

????????????????????????????if(ERROR_SUCCESS == lResult)

????????????????????????????{

?????????????????????????????????????lResult = RegSetValueEx(hOpenKey,DRIVER_USB_NAME,REG_SZ,(BYTE *)DRIVER_USB_VALUE_STORAGE,sizeof(DRIVER_USB_VALUE_STORAGE));

????????????????????????????}

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???????????????????}

???????????????????else

???????????????????{

????????????????????????????lResult = RegOpenKeyEx( HKEY_LOCAL_MACHINE,&hOpenKey );

????????????????????????????if(ERROR_SUCCESS == lResult)

????????????????????????????{

?????????????????????????????????????lResult = RegSetValueEx(hOpenKey,(BYTE *)DRIVER_USB_VALUE_SERIAL,sizeof(DRIVER_USB_VALUE_SERIAL));

????????????????????????????}

???????????????????????????

???????????????????}

???????????????????RegCloseKey( hOpenKey );

?????????}

}