ASIX AX88772 Manual de instalação - Página 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

file in the $(_WINCEROOT)\PUBLIC\COMMON

WinCE 5.0 Driver Installation Guide

file into the $(_WINCEROOT)\PBWorkspaces

file in the $(_WINCEROOT)\PUBLIC

//Remove this line

AX88772A/AX88772

transfer. It will cause the USB 2.0