The C-Media cards are used because of the PTT/COR easy modification/native support... There is tutorials about making PTT/COR using sometimes simple and sometimes more complex circuits or using the GPIO to control PTT... A quick google search will fix that. I remember there is a GPIO PTT repo on Github.



VA2XJM

From: rkarroo@gmail.com
Sent: April 15, 2019 22:54
To: app_rpt-users@lists.allstarlink.org
Reply to: app_rpt-users@lists.allstarlink.org
Subject: Re: [App_rpt-users] NON- C-media Sound card and Pi GPIO

I am also interested by this solution.

My goal (rather our goal because I am not alone in this) is to be able to add a second interconnection medium. Currently in collaboration with the Radio Amateurs from Reunion Island, we (at 3B8) have set up an inter-island connection using svxlink reflector. It works fine though.
An interface using the PI GPIO would help to seperate the fact of being tied up with one particular sound card.Moreover it would remove any possible electronic issue that may arise (humidity on the sound FOB etc) if the node is set remotely.

73s

Rachid Karroo
3B8FP







On Mon, Apr 15, 2019 at 11:02 PM Jean-Michel Vien VA2XJM <va2xjm@gmail.com> wrote:
There is a way to ise GPIO as PTT... But C-Media is cheap and easy to mod...

What is your goal exactly?

VA2XJM 
Sent: April 15, 2019 14:59
Subject: [App_rpt-users] NON- C-media Sound card and Pi GPIO

Is there any possibility in the foreseeable feature to use any ALSA  ( or pulse audio) compatible sound card and the Pi GPIO pins (or anything else) for PTT/COR LOGIC? 

I would love to get away from being stuck to C-Media chips! 

How hard is it to add compatibility. Many other ham programs such as Direwolf Packet TNC use Alsa and several different PTT options and support any sound card that normally works on linux. 

skyler
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