So I think I have it mostly working, I can see rpmsg_pru31 and rpmsg_pru30 
in the /dev folder and I saw that prumodin was already enabled, I had to do 
prumodout first and then prumodin then the script didn't error out.  I see 
P9_42 toggle for a second and then the pin stays high.  Is that what is 
supposed to happen?  If that is what is supposed to happen then great! But 
I do have some questions about why you did certain things during the 
installation.  Let me know how far off I am. 
Thanks,
Ashwini Bhat

On Tuesday, January 31, 2017 at 5:18:08 AM UTC-8, Greg wrote:
>
> There are two examples, one for PRU0 and another for PRU1.  So you will 
> get rpmsg_pru30 for PRU0, and rpmsg_pru31 for the other.
> So if you are seeing rpmsg_pru31, this is a major step forward and you 
> have it working!!!
> Also note the "c" at the first column of the ls; this indicates a 
> character device.  It's good news.
>
> So I think the scripts prumodin and prumodout must be looking for the 
> wrong file names.  It is probable they are not consistent as kernel changes 
> are rolled out.
> So:
>
> ls /sys/bus/platform/devices
>
> Do you see PRU related entries as shown in the set-up documentation? 
>  There are probably small differences which are breaking the scripts.
>

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