[App_rpt-users] SimpleUSB gpio?

Thu Aug 4 13:22:09 UTC 2016

Ahh ok... thanks David, and that makes sense so I appreciate the
clarification :)

On Thu, Aug 4, 2016 at 9:19 AM, David McGough <kb4fxc at inttek.net> wrote:

>
>
> Hi Stephen,
>
> While the CM108/CM119 audio chips found in URI's are powered from the +5V
> USB source, they contain an internal +3.3V regulator and are internally
> completely 3.3V logic....So, you'll never see more than +3.3V as a
> logic "high" level coming from the GPIO pins.
>
>
>
> 73, David KB4FXC
>
>
> On Thu, 4 Aug 2016, Stephen - K1LNX wrote:
>
> > An update on this, and I've learned something that was not so obvious to
> > me, so I'll put this out there in case someone runs into this in the
> future.
> >
> > Consider my dilemma.. I am using an RTCM to drive a pair of radios in
> full
> > duplex mode. I needed to drive a relay (or MOSFET board in my case, more
> on
> > that in a bit) to turn a fan on the transmit radio on and off as needed.
> > Considering there are no GPIO's on the RTCM, I had a URIx also connected
> > that I planned on using for another application that I thought I could
> tap
> > the GPIO off of. I found Kyle, K0KN's excellent fan script, as well as
> this
> > resource:
> >
> > http://latinovoip.net/allstar-and-the-gpio-fan-script-for-
> dmk-engineering-uri/
> >
> > I elected to use the version linked above, and got everything configured,
> > but discovered my cop,62 commands were not working to toggle the GPIO
> line
> > on the URI. I tried a variety of differing configs and troubleshooting
> > methods, none of which worked, when I finally tried to issue the cop
> > command from the node that is on the URI instead as a test, and what do
> you
> > know, it worked.
> >
> > It also appears that GPIO support was added into chan_simpleusb as of
> > revision 1060:
> > http://svn.ohnosec.org/viewvc/projects/allstar/astsrc-1.4.
> 23-pre/trunk/asterisk/channels/chan_simpleusb.c?
> revision=1060&root=svn&view=markup
> >
> > On the hardware side, I had issues with the relay board I was using. I
> was
> > seeing approximately 3.25 v when the GPIO was toggled to an on state on
> the
> > URI. That was not enough to "trigger" the relay board to fire the relay,
> it
> > needs right at a solid 5 volts. Rather than add another piece of hardware
> > to ramp the voltage up, I ran across this on Ebay:
> >
> > http://www.ebay.com/itm/301357646243?_trksid=p2057872.
> m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT
> >
> > This is a 3 channel MOSFET board that will switch the output on above
> 2.5v,
> > off at ground. Perfect for my application. I have yet to test it, but
> have
> > high confidence it will work just fine for my intended purpose.
> >
> > On the software side, I had to make a few small changes in the scripts
> that
> > I got from the link above, most notably:
> >
> > run_app_rpt_fan.sh
> > /etc/asterisk/local/app_rpt_fan.sh 1999 > /dev/null & ; change 1999 to
> the
> > node number that is attached to the URI, a private node in my case
> >
> > app_rpt_fan.sh
> > PTTSTATE="/tmp/RPT_TXKEYED1999" ; change from the $1 variable to the
> node
> > number that is attached to the RTCM instead
> >
> > There are more likely easier solutions than what I've provided above, but
> > this does work as intended now. After 10 seconds, GPIO1 goes high, goes
> > back to ground after 10 minutes. An even easier solution would be to
> > probably just use a snapdisc and have it fire on a certain temperature,
> but
> > I wanted more granular control so that wasn't really an option. I could
> > have also elected to use a Raspberry Pi and tap one of the GPIO's there
> > instead, but my AllStar server is built on an x86 box running other
> > applications so that wasn't really an option either.
> >
> > I'd like to explore the possibility of maybe having chan_voter talk to
> the
> > GPIO's in chan_usb or simpleusb. We could say add a config to the
> > voter.conf file for the particulars for example. Not sure what this would
> > take, but curious if it could be done?
> >
> > Hope this helps someone in the future...
> >
> > 73
> > Stephen
> > K1LNX
> >
> >
> > On Thu, Aug 4, 2016 at 3:32 AM, Stephen - K1LNX <k1lnx at k1lnx.net> wrote:
> >
> > > I'm trying to manipulate a GPIO pin off of a URIx and I am not able to
> get
> > > it to work for whatever reason. If I send a cop,62 command to toggle
> it, it
> > > does not change the state.
> > >
> > > I found this message from Jim that was posted in June 2011:
> > >
> > > http://ohnosec.org/pipermail/app_rpt-users/2011-June/002725.html
> > >
> > > Does anyone know if this was ever implemented? This was quite some time
> > > ago.
> > >
> > > I might be able to use usbradio instead for my application, but prefer
> > > SimpleUSB as it's easier to implement.
> > >
> > > 73
> > > Stephen
> > > K1LNX
> > >
> >
>
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