TI Programmable Real-time Unit software support package issues

[Cheng Chen]

Hi all, 

I am new learner of Beaglebone Black and I was trying to follow the examples of Programmable Real-time Unit software support package from TI. 

I think there was a tutorial website previously but now it's obsolete. I wonder if anybody knows where those materials is available? 

The reason I asked is I am not able to successfully run any examples except PRU_gpioToggle. In particular I am interested in RPMsg transfer between ARM and PRU. For example, PRU_ADC_onChip, after I built the firmware and userspace code, and run ./pru_adc_userspace -c 5. It just shows error messages. 

Reading voltage at ADC Channel: 5

/dev/rpmsg_pru30 could not be opened.

Trying to initialize PRU using sysfs interface.

ERROR: Could not open /dev/rpmsg_pru30

I think it should be just some minor issues like driver missing and such. But I don't know where to start debugging. It would be nice that if anybody knows where the tutorial is. I feel like I'm just trying in the dark. Thanks. 

Regards,

Cheng

[pierric...@gadz.org]

Have you check M Yoder PRU cookbook?

Pierrick Rauby

On 23 Apr 2021, at 16:56, Cheng Chen <chen...@gmail.com> wrote:

Hi all, 

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[Mark Lazarewicz]

Have you looked at  libruio? it fix everything.

 free support as well in group by TJ.

Sent from Yahoo Mail on Android

https://groups.google.com/d/msgid/beagleboard/585CFD31-D22E-4C60-A444-378EB8E47288%40gadz.org

.

[Cheng Chen]

Thanks for the suggestion. This looks like a very well documented reference. I will take a look at it. Does it cover PRU based ADC? I cannot tell from the outline. 

Cheng  

[Cheng Chen]

It's either remoteproc or uio right? To be honest, I don't know much about the difference. But I am following the book by Derek Molly and in his book, he promotes remoteproc. 

Regards,

[Vinicius Juvinski]

I recommend for some directions and concepts the pru cookbook

https://markayoder.github.io/PRUCookbook/

Sent from my iPhone

Em 23 de abr. de 2021, à(s) 18:46, Cheng Chen <chen...@gmail.com> escreveu:

It's either remoteproc or uio right? To be honest, I don't know much about the difference. But I am following the book by Derek Molly and in his book, he promotes remoteproc. 

To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/1184025e-6d73-4e43-b0b8-d78ffcc1466cn%40googlegroups.com.

[Cheng Chen]

Thanks Vinicius. This is a great recommendation!

Cheng

[pierric...@gadz.org]

As far as I remember the cookbook does not cover the ADC but I believe there are some simple ADC-read example directly in the image under /var/lib/cloud9/Techlab/.challenges, or here: https://github.com/beagleboard/cloud9-examples/blob/master/PocketBeagle/TechLab/.challenges/analogIn.pru0.c

They are labeled for PocketBeagle but it's the same ti-am335x chip so they should work easily on the BBB. 

Also this recent thread should be useful! https://groups.google.com/g/beagleboard/c/-WlvGEaqrKU 

Hope it helps! 

Pierrick 

[Cheng Chen]

Hi Pierrick, 

Thanks for the recommendation. They look very useful references. I will read them over. Appreciate your help!

Cheng