[arm-allstar] CM108 USB sound FOB

David McGough kb4fxc at inttek.net
Mon Aug 22 04:19:59 EST 2016

Hi Daniel,

Thanks for the info about the C-media device. We already have support for 
this VID:PID in our recent builds, starting as of V1.02beta for the 
RPi2/3. Lito, KI9H, was the first to report this device and sent a patch 
in late 2015.

Once formally released, previously we've included all customized source
code in the /usr/src/utils folder. As of the upcoming new releases, the
source code has been moved to ArchLinux style packages, since it adds to
the initial download size and isn't immediately needed to get "up and

We also use SVN for source code management.  Access to SVN is currently
restricted to a handful of developers, since this code is in constant
development and just downloading a snapshot frequently won't yield a
working application!

The latest alpha code included many, many nifty enhancements and new
features!  It fixes numerous long-standing annoyances and is currently
being run by a small group of devoted testers.

Another public beta release is coming soon.

73, David KB4FXC

On Mon, 22 Aug 2016, Daniel Bernhardt via arm-allstar wrote:

> Hi Doug,
> I am back at work and as promised I have more information about the HS-100B chip for you. 
> First the link to the amazon page:
> https://www.amazon.de/Sabrent-External-Aluminum-erforderlich-AU-EMAC/dp/B00OJ5AV8I/ie=UTF8
> Although the page is in German you can clearly see from the product name how I got fooled. 
> The name is: "Sabrent USB External Aluminum Stereo Sound Adapter für Windows und Mac. 
> Plug and play. Inkl. USB Kabel. keine Treiber erforderlich. (Silber) [C-Media CM108 Chipset] 
> (AU-EMAC)"
> Attached to this email you get the complete "lsusb -v" output from the device. Its device ID 
> is: "ID 0d8c:0014 C-Media Electronics, Inc."
> I will keep the module for future use when you have completed the code for external I/O. I 
> guess you're going to write a library as a wrapper to have a unified way to act on COS/PTT 
> from asterisk and use plugins in that library to trigger GPIOs for every supported platform 
> like one for RPi and one for BBB and so on. Do you have a git repository so we can play with 
> or review the code or will it be closed source?
> Kind regards,
> Daniel, DK1DB
> On Monday 15 August 2016 15:09:01 Doug Crompton via arm-allstar wrote:
> Daniel,
>    That makes more sense. Interestingly that chip will probably work for audio if setup with 
> the code and then would work in the near future with our code and external I/O for COS/PTT. 
> So don't throw it in the trash. You might be a beta test case.  
> If you have the amazon link please forward and also when you can the 'lsusb' data.
> *73 DougWA3DSPhttp://www.crompton.com/hamradio*
> To: arm-allstar at hamvoip.orgDate: Mon, 15 Aug 2016 20:01:25 +0200Subject: Re: [arm-allstar] 
> CM108 USB sound FOBFrom: arm-allstar at hamvoip.orgCC: daniel at dbernhardt.com
> Hi Doug, I must have been really obsessed with the term  "CM108" to get the name of the 
> other chip that wrong. The chip I mean is named HS100B. It is also produced by C-Media but 
> lacks a lot of features. Here is a link to the chip: 
> http://www.cmedia.com.tw/products/USB20_FULL_SPEED/HS100B[1]
> http://www.crompton.com/hamradio[2]
> http://lists.hamvoip.org/cgi-bin/mailman/listinfo/arm-allstar[3]
> http://hamvoip.org[4]
> --------
> [1] http://www.cmedia.com.tw/products/USB20_FULL_SPEED/HS100B
> [2] http://www.crompton.com/hamradio
> [3] http://lists.hamvoip.org/cgi-bin/mailman/listinfo/arm-allstar
> [4] http://hamvoip.org

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