[arm-allstar] CM119A GPIO

[Doug Crompton]

I think you are talking about two different things. The CM108/119 is an A/D
- D/A which supports up to about 18Khz audio. The way this is used and down
sampled in Allstar the maximum audio frequency is about 3.6Khz which can
pass many of the lower speed digital modes. In fact we have tested it and
there are digital nets using it as connected Allstar. I say lower speed
because none even approach 1200 baud. Whether you could accurately decode
9600 baud in a wide open audio bandwidth situation reliably is kind of
doubtful. It certainly would not work in an unmodified radio. The CMxxx
also has Digital I/O - the 108 has 4 bits and the 119 has 8 bits. These
bits are not designed to pass high speed data nor is there a way to create
a specific baud rate and ensure it is accurate. If you want to send or
receive serial data there are several choices. One would be the Pi, it has
bits designed for this and another is a serial to USB adapter. They are
cheap and just work.


*73 Doug*

*WA3DSP*

*http://www.crompton.com/hamradio <http://www.crompton.com/hamradio>*

On Thu, Dec 6, 2018 at 12:41 AM "Steve L via ARM-allstar" <
arm-allstar at hamvoip.org> wrote:

> Marty,
>
> I know Direwolf is a "soundcard" based AX.25 modem that supports 9600
> baud and the cm108/119 chipset.
>
> https://github.com/wb2osz/direwolf
>
>
> On Wed, Dec 5, 2018 at 11:09 AM "Marty via ARM-allstar"
> <arm-allstar at hamvoip.org> wrote:
> >
> > I'm working on another project for Allstar Link. My question about the
> CM119A GPIO can handle(tx/rx) 9600baud? I'm working on controlling a radio
> module.
> >
> > 73,
> > Marty KD4HLV
> > ALLSTAR 28523
> > _______________________________________________
> >
> > ARM-allstar mailing list
> > ARM-allstar at hamvoip.org
> > http://lists.hamvoip.org/cgi-bin/mailman/listinfo/arm-allstar
> >
> > Visit the BBB and RPi2/3 web page - http://hamvoip.org
> _______________________________________________
>
> ARM-allstar mailing list
> ARM-allstar at hamvoip.org
> http://lists.hamvoip.org/cgi-bin/mailman/listinfo/arm-allstar
>
> Visit the BBB and RPi2/3 web page - http://hamvoip.org
>