基于WINCE6.0系统，SD卡和flash作为PC机的U盘

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作者：LoongEmbedded(kandi)

时间：2012.05.04

类别：WINCE驱动开发

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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

?

[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

?

[HKEY_LOCAL_MACHINEDriversUSBFunctionDriversRNDIS]

??? "idVendor"=dword:0547

??? "Manufacturer"=LOC_USBFN_RNDIS_MANUFACTURER

??? "idProduct"=dword:2c2d

??? "Product"=LOC_USBFN_RNDIS_PRODUCT

?

[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

?

[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"

?

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)

?

?

?

#define UFN_CLIENT_NAME_MAX_CHARS 128

#define UFN_CLIENT_DESCRIPTION_MAX_CHARS 250

?

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;

?

typedef struct _UFN_CLIENT_NAME {

??? TCHAR szName[UFN_CLIENT_NAME_MAX_CHARS];

} UFN_CLIENT_NAME,*PUFN_CLIENT_NAME;

?

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()

?

{

?

??? HANDLE hUfn = NULL;

?

DEVMGR_DEVICE_INFORMATION di;

?

memset(&di,sizeof(di));

?

di.dwSize = sizeof(di);

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

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

?

if (hf != INVALID_HANDLE_VALUE)

?

{

?

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

?

CloseHandle(hf);

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}

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else

?

{

?

?? hUfn = INVALID_HANDLE_VALUE;

?

}

?

return hUfn;

?

}

?

void CusbfunctionswitchDlg::OnBnClickedStorageActivesyncSwitch()

{

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

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

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

?

???????? UFN_CLIENT_NAME uname;

?

???????? UFN_CLIENT_INFO uinfo;

?

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

?

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

?

?

?

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

?

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

?

???????? {

?

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

?

?

???????? }

?

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

?

???????? {

????????

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

???????? {

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

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

?

???????? }

???????? else

???????? {

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

???????? }

?

???????? }

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

?

???????? {

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

?

???????? }

???????? else

???????? {

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

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

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

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

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

?

??????????????????????????? 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));

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

?

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

?????????????????? 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 );

???????? }

}

4.?????