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Re: [Discuss-gnuradio] Error during "make" gr-usrp

From: Eric Blossom
Subject: Re: [Discuss-gnuradio] Error during "make" gr-usrp
Date: Sun, 1 Jan 2006 14:43:10 -0800
User-agent: Mutt/1.5.6i

On Sun, Jan 01, 2006 at 04:30:48PM -0500, Michael Dickens wrote:
> a quick summary would be "it's either really trivial but 
> difficult to find, or really trick and difficult to find".  There  
> seems to be no issue with transport at 2 MBps, usually not for 4 MBps 
> (but sometimes, yes), but nothing beyond that ... it's as if the  
> Mac's USB controller isn't being set to "480 Mbps" ("high speed"  
> according to Apple's documentation) mode.

I am almost certain that the problem is that you are not submitting
multiple asynchonous requests to the USB subsystem.  This 4MB/sec
"limit" is what we are also seeing on NetBSD, which is also (at this
time) lacking a method to stream multiple bulk requests.

Since the existing libusb darwin/osx implementation issues non-blocking
bulk reads and writes, but then immediately blocks waiting for them to
complete, it does seem that we have all the bits and pieces that we
need to construct a fusb_osx.

> gr-audio-osx is being tested at UND, and I'll release a first version 
> sometime soon.  BTW: Either this should be renamed "gr-audio-darwin"  
> or the "darwin" named codes and references in (e.g.) USRP should be  
> renamed "osx".  I believe the latter is the proper naming solution,  
> as the audio and USB support are provided in OSX libraries which (to  
> the best of my knowledge and understanding) are not part of darwin.

OK.  Is there consensus among the mac folks that globally changing
"darwin" to "osx" is the appropriate action?


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