| It usually means that you need to make your Read request buffers a multiple of "MaxPacketSize" of your endpoint. The device is allowed to return up to MaxPacketSize bytes in response to an IN token. When the USB host controller receives this, and your buffer is not that large, it can either put the data in the buffer, returning all yourequested, along with an error, or it can throw all the data away and just return the error. So, if you want to get all the data from your device it sends, always make your requests a multiple of MaxPacketSize bytes.
David Ferguson USB Software Team Apple I did look up the error code in ioReturn.h and found that 0x2e8 is kIOReturnOverrun. The buffer that I allocated for the read did not have any data in it though and the number of bytes returned was zero.
Does that mean that I need to allocate a larger buffer for the async read? Or do I need to queue up several async reads?
Thanks for any help, Ajay Nath
-----Original Message-----
From: email@hidden
To: email@hidden
Cc: email@hidden
Sent: Mon, 26 Mar 2007 5:45 PM
Subject: Re: ReadPipeAsync error = $e00002e8
Does anyone have any ideas about how to solve this problem?
Did you look up what that error code means? ;-)
--gc ____________________________________________________________________ Sr. Software Engineer Apple Developer Technical Support
WWDC 2007 • June 11-15 • Moscone West • San Francisco, CA
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