USB Mass storage大容量SD卡问题

hwei10 2011-04-27 09:54:58

在做USB mass storage功能时出现如下问题：
2G以下的卡通过USB MASS STORAGE在PC端能正常识别；
4G或8G的卡在PC端提无法识别。

系统是WINCE5.0，我用4G的卡调试了一下，发现BLOCK.CPP文件中的STORE_Init函数中OpenStore()打开失败。
请各位大侠给点建议，谢谢。

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bhcnav456 2012-08-10

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bhcnav456 2012-08-10

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成功，综合14楼和13楼方案，可以结了

bhcnav456 2012-08-10

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没看到图呀

ZhuXudong0518 2012-08-10

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各位搞定，详细方案如下：
1：找到D:/WINCE600/PRIVATE/WINCEOS/COREOS/STORAGE/FSDMGR目录下的volumeapi.cpp文件，找到 FSDMGR_CreateFileW 函数，添加红色标记部分的代码，编译后可解决大容量SD卡的SN号读取问题

EXTERN_C HANDLE FSDMGR_CreateFileW (MountedVolume_t* pVolume, HANDLE hProcess,
const WCHAR* pPathName, DWORD Access, DWORD ShareMode,
SECURITY_ATTRIBUTES* pSecurityAttributes, DWORD Create,
DWORD FlagsAndAttributes, HANDLE hTemplate,
PSECURITY_DESCRIPTOR pSecurityDescriptor, DWORD SecurityDescriptorSize)
{
HANDLE h = INVALID_HANDLE_VALUE;

SECURITY_ATTRIBUTES SecurityAttributes;

DEBUGCHK (!pSecurityAttributes);
if (pSecurityDescriptor) {
SecurityAttributes.nLength = sizeof (SECURITY_ATTRIBUTES);
SecurityAttributes.lpSecurityDescriptor = pSecurityDescriptor;
SecurityAttributes.bInheritHandle = FALSE;
pSecurityAttributes = &SecurityAttributes;
}

LRESULT lResult = pVolume->EnterWithWait ();

if (ERROR_SUCCESS == lResult) {

// Get the topmost file system object associated with the volume.
// If another filter is hooked between now and the time we call
// create file, we'll still use this one. This file system object
// will be referenced by the handle object.
FileSystem_t* pFileSystem = pVolume->GetFileSystem ();

DWORD Attributes = 0;
if (OPEN_EXISTING != Create) {
// If not trying to open an existing file, there is the
// possibility that we will create a new one. In order to
// properly generate notifications we need to detect whether or
// not the file already exists using GetFileAttributes.
Attributes = pFileSystem->GetFileAttributesW (pPathName);
}

HANDLE hInt = pFileSystem->CreateFileW (hProcess, pPathName, Access,
ShareMode, pSecurityAttributes, Create,
FlagsAndAttributes, hTemplate);

if (INVALID_HANDLE_VALUE != hInt) {

// The file system succeeded creating/opening the file, so
// allocate an FileSystemHandle_t object and associate it with the
// MountedVolume_t object.

// Indicate whether or not this is a console or psuedo-device
// handle when creating the FileSystemHandle_t object. This will dictate
// how notifications are performed on the handle.
DWORD HandleType = FileSystemHandle_t::HDL_FILE;
/*******************chaged by pang********************************/
if (IsPsuedoDeviceName(pPathName))

{

HandleType |= FileSystemHandle_t::HDL_PSUEDO;

}
/***************************************************/
if (IsConsoleName (pPathName)) {
HandleType |= FileSystemHandle_t::HDL_CONSOLE;
}

// Allocte a new handle object to track this item.
h = pVolume->AllocFileHandle (reinterpret_cast<DWORD> (hInt),
HandleType, pFileSystem, pPathName, Access);

if (INVALID_HANDLE_VALUE != h) {

// Perform notifications only when the handle is for a real file,
// not a pseudo device handle or console handle. Devices and streams
// shouldn't ever generate notifications.
if (FileSystemHandle_t::HDL_FILE == HandleType &&
!IsPsuedoDeviceName (pPathName)) {

// Successfully opened the file. Perform file notifications
// as required.
if (INVALID_FILE_ATTRIBUTES == Attributes) {

// The file did not previously exist; notify that it has
// been added.
pVolume->NotifyPathChange (pPathName, FALSE, FILE_ACTION_ADDED);

} else if ((CREATE_ALWAYS == Create) ||
(TRUNCATE_EXISTING == Create)) {

// The file previously existed but is being re-created or
// truncated so notify that it has changed.
pVolume->NotifyPathChange (pPathName, FALSE, FILE_ACTION_MODIFIED);
}
}

} else {

// Failed to allocate a handle object, so close the handle
// that was returned by the file system.
pFileSystem->CloseFile (reinterpret_cast<DWORD> (hInt));
}

} else if (pPathName && (wcsicmp (pPathName, L"\\VOL:") == 0)) {

// TODO: Privilege check for raw disk i/o. This requires more privilege than file i/o.

// Clear error code set by the FSD when it failed to open VOL: on its own.
SetLastError (ERROR_SUCCESS);

// We failed to open the file, but if it is VOL: special case this
// and allow direct partition access.
h = pVolume->AllocFileHandle (reinterpret_cast<DWORD> (hInt),
FileSystemHandle_t::HDL_PSUEDO, pFileSystem, pPathName, Access);
}

pVolume->Exit ();

} else {

SetLastError (lResult);
}

return h;
}
2：如图所示添加系统组件，使系统支持exFAT文件系统，然后编译内核OK，烧录4G以上大容量SD卡在PC端便可以识别

ZhuXudong0518 2012-02-09

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最新进展：4G卡设备可打开，也可获取设备信息。代码如下：
// open store
TCHAR sdFolderName[64]; //the SD card name such as : MMC disk, Storge card
TCHAR sdDestFileName[64];//"\\sdFolderName\\VOL:"
memset(sdFolderName,0,64);
memset(sdDestFileName,0,64);
wsprintf(sdFolderName,TEXT("%s"),TEXT("Storage Card"));
swprintf(sdDestFileName,TEXT("\\%s\\VOL:"),sdFolderName);
g_hStore_SD = CreateFile(sdDestFileName, GENERIC_READ|GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, NULL);

// g_hStore_SD = OpenStore(_T("DSK4:"));//g_hStore_SD = OpenStore(g_szDeviceName);
if ((g_hStore_SD == NULL) || (g_hStore_SD == INVALID_HANDLE_VALUE)) {
dwError = GetLastError();
DEBUGMSG(ZONE_ERROR, (_T(
"%s failed to open store %s; error = %u\r\n"
), pszFname, g_szDeviceName, dwError));
goto EXIT;
}
DEBUGMSG(ZONE_COMMENT, (_T("%s opened store %s\r\n"), pszFname, g_szDeviceName));

// read disk information
fResult = DeviceIoControl(
g_hStore_SD,
IOCTL_DISK_GETINFO,
NULL,
0,
&g_diDiskInfo_SD,
sizeof(g_diDiskInfo_SD),
&dwBytesReturned,
NULL);

通过打印信息可看到g_diDiskInfo_SD.di_bytes_per_sect和g_diDiskInfo_SD.di_total_sectors的值分别为0x200、0x760800.

但结果还是：在PC端不能通过MASS Storage对4G卡进行访问。同样的代码，2G卡访问正常。

各位加油啊，结论马上就出现啦！

ZhuXudong0518 2012-02-08