[LinuxPPS] Multiple device tree pps-gpio overlays? Corrected files attached

[Frank Wayne]

Tom,

I installed a fresh Stretch image, copied your dtbo over, changed config.txt as you recommended, and now have two pps devices. :) Thank you very much for your help. I need to get some more hardware before I can test functionality.

Frank

-----Original Message-----
From: tom burkart <tom at aussec.com> 
Sent: Wednesday, 20 June, 2018 03:45
To: tom burkart <tom at aussec.com>
Cc: Frank Wayne <fwayne at frankwayne.com>; discussions at linuxpps.org
Subject: Re: [LinuxPPS] Multiple device tree pps-gpio overlays? Corrected files attached

Hi Frank,
there is another mistake in the earlier files.  Corrected ones are attached...

Tom


Quoting tom burkart <tom at aussec.com>:

> Hi Frank,
> I have done a bit more research on this and the file below should be  
> all you need...
> Use in your config.txt:
>
> dtoverlay=pps-gpio,gpiopin=18,gpiopin1=17
>
> The attached file needs to be put in the /boot/overlays directory.
> Please make sure you save the original pps-gpio.dtbo
>
> To use only one PPS pin you can use an invalid gpio pin for the second  
> one or even -1.  This will produce an error message and disables the  
> second one.
>
> You should be able to use:
>
> dtoverlay=pps-gpio
>
> as GPIO18 and GPIO17 are the defaults
>
> I believe there is a still better way of doing this but I am still not  
> conversant enough with the device tree parlance.  I have attached the  
> compiled pps-gpio as well as the source so anyone can experiment.
>
> Kind regards,
>
> Tom
>
>
> Quoting Frank Wayne <fwayne at frankwayne.com>:
>
>> Much appreciated. When I get back home next month, I hope to have   
>> some time to test this.
>>
>> -----Original Message-----
>> From: discussions-bounces at linuxpps.org   
>> <discussions-bounces at linuxpps.org> On Behalf Of tom burkart
>> Sent: Sunday, 06 May, 2018 04:55
>> To: discussions at linuxpps.org
>> Subject: Re: [LinuxPPS] Multiple device tree pps-gpio overlays?
>>
>> Hi,
>> just replying to an old post (Oct 2017):
>>
>>> I am trying to create two PPS devices on a Raspberry Pi 3 running 
>>> Raspbian (Stretch). My config.txt contains:
>>> dtoverlay=pps-gpio,gpiopin=17
>>> dtoverlay=pps-gpio,gpiopin=18
>>> This creates only a single PPS sevice: /dev/pps0. How do I get two 
>>> (or
>>> more) devices?
>>
>> I have a running RPI with PPS on pin 18 that works quite well.
>> What you are doing requires a second pps-gpio.dtbo with some labels  
>> changed so that it works as a second PPS input.
>>
>> I have attached a modified dtbo file together with its source file   
>> so you can experiment yourself.  These are untested and may need   
>> further modifications before it works.  BTW, "dtc" is the command to  
>> convert between the two.