Am Donnerstag, 23.01.03 um 17:58 Uhr schrieb Fernando Urbina:
On 1/23/03 3:49 AM, MacInsight wrote:
- the device is doing something very odd (technician: "...with
MS-Windows, we have seen no similiar problems." but, well, as far as
I've heard in different OSs the USB specs are interpreted in different
manners)
If you can point us to where in the spec we are misinterpreting
something,
we will make sure to fix it.
I ment it the other way: my feeling is that OS X is nearer to the specs
than MS-Windows;
MS-Windows maybe is more graceful with non-1.1-compliant devices...
What I think might have happened is that the
device worked under another OS and thus the manufacturer thought it
was USB
1.1 compliant; those are not the same thing.
- the ResetPipe() method is asyncronous which isn't said in the docs
You should use ClearPipeStallBothEnds(true) instead of ResetPipe().
It is a
synchronous call so once you it returns, the device has received the
DeviceRequest to clear the endpoint halt.
Ok, but as I wrote, I tried that already I suppose the device answers
something like "yes, I'm ready with resetting my pipes" to the host,
but indeed it has to perform some additional actions so it gets
confused when it should receive the following bulk transfers.
I'm more ensured as before now that the device is to blame and has to
change something in its timing parameters to get back to work properly
under OS X.
-----
Am Donnerstag, 23.01.03 um 20:13 Uhr schrieb Barry Twycross:
At 11:49 AM +0100 1/23/03, MacInsight wrote:
Before any bulk endpoints are used, the userland-driver does
USBDeviceOpen(), GetNumberOfConfigurations(),
GetConfigurationDescriptorPtr(), SetConfiguration(),
CreateInterfaceInterface(), USBInterfaceOpen() and ResetPipes() with
a subsequent DeviceRequest() (with bRequest = kUSBRqClearFeature and
wValue = kUSBFeatureEndpointStall) to synchronize the data-toggle.
Do you need to do the ResetPipe?
I've heard on some OSs you need to do this for reasons which are not
clear to me, as far as I know its not necessary on Mac OS.
I wrote this code for a system-independant code base (although the
design obviously derives from the kind in which devices are dealt with
on MS-Windows).
The server process which deals with my company's devices and uses my
userland code, presumes a system-independant resetPipes() function to
be implemented.
Maybe also the device expects a regularly performed clean-up by getting
it's pipes resetted, that I do not know at least I could try out what
will happen if my resetPipes() implementation is empty B-)
Thanks for your input,
Dirk Stegemann
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