AM6442: How to Program PRU Firmware in Mixed C and Assembly?

Hello,

You will want to reference the PRU Getting Started Labs in your PRU Software Support Package (PSSP) under labs/Getting_Started_Labs. We cover both defining an external assembly function, and using inline assembly code in your C program.

HOWEVER! As of October 11 2021, I am still adding AM64x to the Getting Started Labs, porting the Getting Started Labs to be compatible with Linux 5.10, and writing the documentation for the Getting Started Labs. I was hoping to have all this done last month, but the documentation is taking more time to write than expected.

So you have several options:

1) Reference the source code for the AM65x Getting Started Labs, and understand that you will need to make some small tweaks. If you already know how to create PRU projects and write PRU code, this should be good enough.

2) Wait a couple weeks until I have the ported code pushed to the public repo, and the documentation pushed to https://software-dl.ti.com/processor-sdk-linux/esd/docs/08_00_00_21/linux/Foundational_Components/PRU-ICSS-Training.html

3) If you are interested in seeing the Getting Started Labs documentation and source code now, I can provide "first drafts" of both. If you choose this option, please make sure to give me feedback so that I can improve later drafts.

Regards,

Nick

Hi Nick,

I want the first drafts, please share to me. Thank you!

Hello,

Thank you for your patience here. I had to pivot to getting the full PSSP v6.0.0 release out the door by the end of the week, which will include AM64x getting added to the Getting Started Labs. I hope to push the full patchset public by the end of the day. I will update the thread when the full release is public instead of attaching a patch set the day before the actual release.

I should be able to attach the current draft of the Getting Started Labs documentation by tomorrow.

Regards,

Nick

Ok, PSSP v6.0.0 is live at https://git.ti.com/cgit/pru-software-support-package/pru-software-support-package/ . I will plan to take a look at generating the HTML output of the current draft of the getting started labs documentation for you to take a look at tomorrow.

Regards,

Nick

Thank you, waiting for your update!

FUTURE READERS:
This is a draft document. Before you read it, check to see if we have uploaded the finished document to the PRU "Training" section of the Linux SDK documentation: https://software-dl.ti.com/processor-sdk-linux/esd/docs/08_00_00_21/linux/Foundational_Components/PRU-ICSS-Training.html 

Here is the partial first draft of the Getting Started Labs:

PRU-Getting-Started-Labs.html

Some notes: 

* I have only written through Labs 1 and 2 at this point. Anything in Lab 3 is from notes I took a while back, and Lab 4 does not apply to anything but the TI-RTOS found on AM335x/AM437x/AM57x.

* Apologies for the formatting - I lose all the formatting when I pull this HTML file out of the other 70MB of generated SDK documentation. Not sure how to fix at this point.

* If you have any feedback, please let me know. If I have time, I hope to make more progress on Labs 3-5 later this week.

Regards,

Nick