基于WINCE6.0系統，SD卡和flash作為PC機的U盤
分類： WINCE驅動開發2012-05-04 21:26 181人閱讀 評論(0) 收藏 舉報
********************************LoongEmbedded********************************
作者：LoongEmbedded(kandi)
時間：2012.05.04
類别：WINCE驅動開發
********************************LoongEmbedded********************************
根據客戶的要求，希望我們WINCE裝置可以作為PC機器的可移動磁盤，并且可以通過應用軟體能夠實作mass storage和ActiveSync的切換，那怎麼實作這個功能呢：
1. 系統元件
選擇ActiveSync、mass storage和serial元件，如下圖所示：
圖1
2. 驅動的支援以及需要注意的系統資料庫項
我們先來看USB用戶端驅動的系統資料庫資訊
IF BSP_USBFNCLASS == MASS_STORAGE
[HKEY_LOCAL_MACHINE\Drivers\USB\FunctionDrivers]
"DefaultClientDriver"=- ; erase previous default
"DefaultClientDriver"="Mass_Storage_Class"
ENDIF BSP_USBFNCLASS
[HKEY_LOCAL_MACHINE\Drivers\USB\FunctionDrivers\Mass_Storage_Class]
"Dll"="usbmsfn.dll"
"InterfaceSubClass"=dword:06
"InterfaceProtocol"=dword:50
"DeviceName"="DSK1:" ; 被映射為U盤的儲存設備的裝置名
"FriendlyName"="Mass Storage";顯示裝置名
"idVendor"=dword:045E; Vendor ID，應該向USB組織申請
"Manufacturer"="Generic Manufacturer (PROTOTYPE--Remember to change idVendor)";廠商命
"idProduct"=dword:FFFF; Product ID，由廠商定義
"Product"="Generic Mass Storage (PROTOTYPE--Remember to change idVendor)";産品名
"bcdDevice"=dword:0;裝置的版本号
[HKEY_LOCAL_MACHINE\Drivers\USB\FunctionDrivers\RNDIS]
"idVendor"=dword:0547
"Manufacturer"=LOC_USBFN_RNDIS_MANUFACTURER
"idProduct"=dword:2c2d
"Product"=LOC_USBFN_RNDIS_PRODUCT
[HKEY_LOCAL_MACHINE\Drivers\USB\FunctionDrivers\Serial_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_USER\ControlPanel\Comm]
"Cnct"="`USB"
在上面的系統資料庫資訊中，如果要把SD卡或是flash分區作為PC機的可移動盤，一定要讓"DeviceName"="DSK1:"中的1和SD卡驅動或是flash驅動的index一緻，這樣就可以實作這個功能了。
3. mass storage和ActiveSync切換
這個功能可以通過一個應用軟體來實作，主要的工作如下：
⑴基于GUID調用FindFirstDevice函數擷取到USB控制器驅動(比如s3c2450_usbfn.dll)的句柄。
⑵通過上面擷取的驅動句柄，以控制碼IOCTL_UFN_GET_CURRENT_CLIENT調用DeviceIoControl函數來擷取目前已經加載的USB用戶端驅動，然後以控制碼IOCTL_UFN_CHANGE_CURRENT_CLIENT調用DeviceIoControl函數來切換USB用戶端驅動(比如由mass storage切換為ActiveSync)。
⑶修改系統資料庫資訊，比如把"DefaultClientDriver"="Mass_Storage_Class"改為"DefaultClientDriver"="serial"
具體的代碼如下：
#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("Drivers\\USB\\FunctionDrivers")
#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, 0, 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, 0, NULL);
CloseHandle(hf);
}
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, NULL, 0, &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, 0, NULL, NULL))
{
RETAILMSG(1, (TEXT("deviceiocontrol failed, error = %d/r/n"), GetLastError()));
}
else
{
LONG lResult = 0;
if(fnTypeStorage)
{
lResult = RegOpenKeyEx( HKEY_LOCAL_MACHINE, DRIVER_USB_KEY, 0, 0, &hOpenKey );
if(ERROR_SUCCESS == lResult)
{
lResult = RegSetValueEx(hOpenKey,DRIVER_USB_NAME,0,REG_SZ,(BYTE *)DRIVER_USB_VALUE_STORAGE,sizeof(DRIVER_USB_VALUE_STORAGE));
}
}
else
{
lResult = RegOpenKeyEx( HKEY_LOCAL_MACHINE, DRIVER_USB_KEY, 0, 0, &hOpenKey );
if(ERROR_SUCCESS == lResult)
{
lResult = RegSetValueEx(hOpenKey,DRIVER_USB_NAME,0,REG_SZ,(BYTE *)DRIVER_USB_VALUE_SERIAL,sizeof(DRIVER_USB_VALUE_SERIAL));
}
}
RegCloseKey( hOpenKey );
}
}