[arm-allstar] GPIO for PTT and COS?

[David McGough]

Hi Greg,

The issue isn't C--you have to remember that python, java, the Linux
Kernel, etc., are all written in C.

My major concern is that we've got varying support for several different
hardware platforms, including RPi2/3, BBB, various Odroids and I've got
this code running on PC hardware, too.  Managing GPIO between each of
these different platforms is subtly to significantly different, leading to
many potential headaches....For example: if software monitoring a rain
gauge misses an interrupt, nothing disastrous happens.  If repeater
controller software misses an interrupt, the transmitter might not unkey,
or COS might act flaky now and then, not activating when someone tries to
key the repeater. With the AllStar code, if any inconsistency happens even
occasionally, it's a huge deal.

The advantage obtained by sticking with USB hardware (like a CM1xy sound 
FOB) is that the software API is the same across all the various 
computers. And, that software is very well tested.

Now that modifiable sound FOBs are getting harder to obtain, I'm looking 
hard at getting more I/O solutions available, in a modular way.

73, David KB4FXC



On Tue, 7 Jun 2016, Greg Thornwall via arm-allstar wrote:

> 
> Hi David & Doug,
> Is that because of the lack of interrupts in C on the Pi?  I built a wx 
> station and implemented  an interrupt in Python that listens to my rain 
> gauge, a reed switch that closes for a fraction of a second.
> 
> I guess there's nothing like that in C on the Pi? Or is there more to it 
> than that? Can one integrate Python code into C? In Java you can use JNI 
> for native C calls.
> 
> 73 Greg KD3SU
> 
> 
> 
> On 06/07/2016 01:29 PM, David McGough via arm-allstar wrote:
> > Hi Greg,
> >
> > Currently there isn't a way to efficiently utilize the RPi2/3 on-board
> > GPIO for PTT or COS.  However, more I/O methods are currently in
> > development.  This new code will start showing up in upcoming Alpha/Beta
> > releases.
> >
> > 73, David KB4FXC
> >
> >
> >
> >
> >
> > On Tue, 7 Jun 2016, Greg Thornwall via arm-allstar wrote:
> >
> >> I was wondering is there a way (in the code) to setup using 2 GIPOs for
> >> COS and PTT? Do you know where that's implemented in the code? Is it in
> >> the channel C files? I would guess there are some C GIPO libraries for
> >> the Raspberry Pis.
> >>
> >> Tnx 73 Greg KD3SU
> >>
> >>
> >>
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> >
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