> On Jun 11, 2016, at 18:14 , [email protected] wrote:
>
> Hi Forum
>
> I would like to learn to use the PRUs on the Beaglebone Black. I am thinking
> to implement the NMRA DCC command protocol using the PRUs.
> http://www.nmra.org/sites/default/files/s-92-2004-07.pdf to have a goal.
>
> I would use Linux on the BBB to provide a GUI for a application to control
> the trains and use the PRU to generate the DCC signal. I would use shared
> memory from BBB to PRU to update the PRU about the packets to be sent to the
> track. The PRU would just produce signal based on data passed from the
> Linux application on the BBB.
>
> The DCC signal is a square form wave with a cycle period of 58us for 1 and
> approx 100us for 0. I would use PRU0 as a programming track and PRU1 as a
> live track with an appropriate H-Bridge.
>
> I have been reading the PRU assembly documentation. However I would like
> guidance on the best way to produce the signal in the PRU?
>
> Should I use the IEP timer or is there a better way? Are there any examples
> using the clpru compiler for this or should I stick with pasm?
>
> I would like advice on approaches before I start so I learn as much as I can
> by doing this project.
I think the WS281x LEDs use a similar signaling protocol. Perhaps some of the
code in the LEDScape project can help:
https://github.com/osresearch/LEDscape
It uses pruss, not remoteproc, however. You might want to develop your code to
use remoteproc to talk to the PRUs.
--
Rick Mann
[email protected]
--
For more options, visit http://beagleboard.org/discuss
---
You received this message because you are subscribed to the Google Groups
"BeagleBoard" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To view this discussion on the web visit
https://groups.google.com/d/msgid/beagleboard/0B6E322C-874C-4750-BA60-BFB54C0A5322%40latencyzero.com.
For more options, visit https://groups.google.com/d/optout.
