X: SampleUSBMIDIDriver / SetConfiguration question

Subject: X: SampleUSBMIDIDriver / SetConfiguration question
From: Laurent Humbert <email@hidden>
Date: Fri, 20 Sep 2002 15:52:09 +0200

Hi,

I used the SampleUSBMIDIDriver sample code to produce a driver and everything worked fine (first time !)

There has been an upgrade in the device's hardware/firmware, and now the USBDevice::OpenAndConfigure fails because the call to SetConfiguration returns "device not responding".

This happens when the device is connected to the Mac's USB port, then switched on. If the device is battery-powered, switched on, then plugged in, everything works because the device is fully initialised.

My question: Is there anything I can do to work around the problem or do I tell the manufacturer that it's really their fault and that the device *must* respond to SetConfiguration calls immediately after USBDeviceOpen, even when it's just been switched on ?

(I tried adding a call to usleep between USBDeviceOpen and SetConfiguration but this didn't seem to help)

Here's the routine:

bool USBDevice::OpenAndConfigure(UInt8 configIndex)
{
	require(Usable(), errexit);

// Get a pointer to the configuration descriptor require_noerr((*mPluginIntf)->GetConfigurationDescriptorPtr(mPluginIntf, configIndex, &mConfigDescPtr), errexit);

	// Open the device
	if (!mIsOpen) {

require_noerr((*mPluginIntf)->USBDeviceOpen(mPluginIntf), errexit); mIsOpen = true; }

require_noerr((*mPluginIntf)->SetConfiguration(mPluginIntf, mConfigDescPtr->bConfigurationValue), errexit);

	return true;
errexit:
	return false;
}

Thanks!

Laurent
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Follow-Ups:
- Re: X: SampleUSBMIDIDriver / SetConfiguration question
  - From: Barry Twycross <email@hidden>
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  - From: Laurent Humbert <email@hidden>

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