[App_rpt-users] USB Sound Dongle Challenges

Thor Wiegman n7jct at aplaceonthe.net
Thu Mar 17 22:56:03 EDT 2016


So I get that we're restricted to the C-Media chips.  That's fine, they 
certainly capable of way better audio than we're using on a 3K 
communications circuit.  It's a fine device for audio, way more 
excellent than we need.

But why limit ourselves to using the audio chip for digital I/O?

We already know that the parallel port can be used for this I/O (smoke 
'em if you got 'em).  So it is possible to use something other than the 
audio chip.

For applications with Raspberry Pi, what about using the GPIO pins?

For Pi and all others why not a USB relay board?  Something like the IC 
Station ICSE013A would give us PTT and another relay for things like 
fans or whatnot for about $5.  For a few more bucks you could get the 
ICSE012A or ICSE014A and have even more output control.

I've also seen some USB I/O boards for about $5 that give 16 pins, your 
choice of input or output on each.  If these could be adapted then 
chan_simpleusb could be used and the radio can provide COR and CTCSS.

I'm just trying to think of ways we can use what we already have or to 
use cheap stuff that's commonly available.  I



On 03/15/2016 06:51 PM, app_rpt-users-request at ohnosec.org wrote:
> Message: 1
> Date: Tue, 15 Mar 2016 22:05:54 +0000 (UTC)
> From: Jim Aspinwall <no1pc at yahoo.com>
> To: "app_rpt-users at ohnosec.org" <app_rpt-users at ohnosec.org>
> Subject: [App_rpt-users] USB Sound Dongle Challenges
> Message-ID:
> 	<504928773.650221.1458079554502.JavaMail.yahoo at mail.yahoo.com>
> Content-Type: text/plain; charset="utf-8"
>
>
> The original CM-108/-109-based products a few have documented mods for are evaporating from common availability.?
> A few of us have ordered or tried to order from "known good links" (circa 2014/2015) off Amazon or eBay only to encounter dead/expired/no-longer-available links or "byte the bullet" and opt for a 108/109-claiming look-alike and come up with yet another version of unusable product.
> If we can determine the same/similar/equivalent pinout locations between the 108, 109, 119 or whatever different chips we might be able to revise some of the mod docs for alternatives.
> However, the latest small batch I acquired came with not pin-exposed chip-on-board (for which there could be more hope) but connection flooded die-on-board implementations and drastically differently layout, no direct access to pins without risking the chip trying to 'uncap' it.
> Two recent acquisitions pictured:
> http://www.no1pc.org/radio/NewerChip.jpg?- CM119 chip - one such device has already been proven to work with IRLP and Asterisk via Pi - but I'd like to do the PTT/COS tap-offs.
>
> http://www.no1pc.org/radio/DieOnBoard2.jpg?- not yet sure of the chip, but pinouts are obviously a challenge.
>
> I can try to poke about and see if the exposed-pin CM119 is viable, if someone familiar with the chips or their layout can advice. ?The die-version - good luck?
> Ideas? ?Existing updates?
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