Re: GetMaxPacketSize questions

Subject: Re: GetMaxPacketSize questions

From: Milton Aupperle <email@hidden>

Date: Thu, 07 Jul 2005 12:39:06 -0600

Delivered-to: email@hidden

Hi Mark;

I don't know if this is related or not, but there is something "odd" going on.

On my Dual G5 OSX 10.4.1 , using the USB Prober (Version 2.2) is giving me some odd results when browsing the interfaces in the Bus Probe window.

If I look at individual interfaces (all of them are like this, hubs, devices etc.) they look like this:

Endpoint 0x01 - Bulk Output

Address: 0x01 (OUT)

Attributes: 0x02 (Bulk no synchronization data endpoint)

Max Packet Size: 0x01 (OUT)

Polling Interval: 0 ms

and the max packet size value is always always the same as the Address. On my G4 1.25 gighz Laptop (Also OSX 10.4.1) using the same 2.2 version of the USB Prober, it returns the actual max packet size in bytes.

The only difference between them is that i installed the "IOUSBFamily-220.4.10-log.dmg" logger version on the G5 dual. Re-installing the non logging version does not fix it either - it appears to be permanent.

So I'm not sure if this is cosmetic or symptomatic of something else.

HTH..

Milton J. Aupperle
President
ASC - Aupperle Services and Contracting
Mac Software (Drivers, Components and Application) Specialist
#1005 - 815 14th Avenue. S.W.
Calgary Alberta Canada T2R0N5
1-(403)-229-9456
email@hidden
www.outcastsoft.com

On 7-Jul-05, at 12:23 PM, Mark Cookson wrote:

How does GetMaxPacketSize determine the value it reports? From looking at
the source, it looks like it just returns the value from the descriptor, but
if that's the case, how could it possibly be returning the wrong
information?

The descriptor clearly says it's a non-zero value, but GetMaxPacketSize()
returns 0. Is it getting the information in some other way that I'm not
seeing?

Has anyone else ever reported an issue like this? Seems very strange.
--
Mark Cookson
M-Audio, a part of Avid
225 Locust St.
Hudson, WI 54016

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References:

>GetMaxPacketSize questions (From: Mark Cookson <email@hidden>)