[arm-allstar] GPIO for PTT and COS?

[David Lang]

oops, meant to forward this, not reply

David Lang

On Tue, 7 Jun 2016, David Lang via arm-allstar wrote:

> Date: Tue, 7 Jun 2016 16:50:30 -0700 (PDT)
> From: David Lang via arm-allstar <arm-allstar at hamvoip.org>
> To: David McGough via arm-allstar <arm-allstar at hamvoip.org>
> Cc: David Lang <david at lang.hm>
> Subject: Re: [arm-allstar] GPIO for PTT and COS?
> 
> This is part of a discussion on why we are needing to hook up to the tiny 
> pins on the USB sound card, and how in the 'near' future we may not need to 
> do that any more and be able to hook to some of the other pins on the Pi (the 
> GPIO, General Purpose Input Output, pins)
>
> David Lang
>
> On Tue, 7 Jun 2016, David McGough via arm-allstar wrote:
>
>> Date: Tue, 7 Jun 2016 15:23:17 -0400 (EDT)
>> From: David McGough via arm-allstar <arm-allstar at hamvoip.org>
>> To: Greg Thornwall via arm-allstar <arm-allstar at hamvoip.org>
>> Cc: David McGough <kb4fxc at inttek.net>
>> Subject: Re: [arm-allstar] GPIO for PTT and COS?
>> 
>> 
>> 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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>>>> 
>>>> Visit the BBB and RPi2 web page - http://hamvoip.org
>>>> 
>>> 
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>>> 
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>>> 
>> 
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