ASIX AX88772 Manuel d'installation - Page 11
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6. Update WinCE 5.0 USB 2.0 HCD Driver (EHCI.DLL)
The default USB 2.0 HCD driver (EHCI) of Windows CE 5.0 Platform Builder couldn't handle the
USB 2.0 device Hot-Swap event well
device driver couldn't be loaded successfully after hot-swapping the device for a couple of times
because the physical memory (TD buffers) resources are not released by the USB 2.0 HCD driver
when the USB 2.0 device is unplugged while there is a pending transfer. This bug has been
confirmed by Microsoft and will be fixed in the future version of Windows CE 5.0.
Solution:
1. ASIX provides an updated EHCI.DLL file for standard X86 CE/PC platform.
1-1. Copy the updated
\<YourProjectName>\RelDir\CEPC_x86_Release subdirectory.
1-2. Run "Make Run-Time Image" to create the NK.BIN image file.
2. Customer manually modifies the
\COMMON\OAK\DRIVERS\USB\HCD\USB20\EHCI subdirectory and rebuild
a new EHCI.DLL driver for their specific WinCE BSP platform.
2-1. Modify the
\OAK\DRIVERS\USB\HCD\USB20\EHCI subdirectory to remove below
two statements.
<<< In the cpipe.cpp file >>>
void CQueuedPipe::AbortQueue( void )
{
....
ASSERT( m_pUnQueuedTransfer == NULL);
if (m_pQueuedTransfer) {
RemoveQHeadFromQueue();
//
m_pQueuedTransfer;
m_pQueuedTransfer ->AbortTransfer();
GetQHead()->InvalidNextTD();
m_pCEhcd->AsyncBell();// Ask HC update internal structure.
Sleep(2);// this sleep is for Interrupt Pipe;
m_pQueuedTransfer->DoneTransfer();
//
m_pQueuedTransfer = NULL;
delete m_pQueuedTransfer;
m_pQueuedTransfer = NULL;
InsertQHeadToQueue() ;
}
ASSERT(m_pQueuedTransfer == NULL);
....
}
while there is a pending
EHCI.DLL
cpipe.cpp
cpipe.cpp
file in the $(_WINCEROOT)\PUBLIC\COMMON
Copyright (C) 2005-2009 Reserved by ASIX Electronics Corporation
WinCE 5.0 Driver Installation Guide
file into the $(_WINCEROOT)\PBWorkspaces
file in the $(_WINCEROOT)\PUBLIC
//Remove this line
//Remove this line
11
AX88772A/AX88772
transfer. It will cause the USB 2.0