LIBPRUIO

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1

Hi, does anyone know if libpruio works also for this kernel version? (http://users.freebasic-portal.de/tjf/Projekte/libpruio/doc/html/index.html)

regards

2

For libpruio you need to switch the uio pru option, for that kernel see
this note:

http://elinux.org/Beagleboard:BeagleBoneBlack_Debian#U-Boot_PRU_Options

Regards,

3

Thanks Robert,

But /boot/uEnv.txt it shows this

Then, Is PRU enabled by default?

Regards

4

it's setup for ti's remoteproc_pruss, so you need to:

#uboot_overlay_pru=/lib/firmware/AM335X-PRU-RPROC-4-4-TI-00A0.dtbo

and:

uboot_overlay_pru=/lib/firmware/AM335X-PRU-UIO-00A0.dtbo

Regards,

5

I love how easy it is to switch now, but maybe I should submit a patch to convert it to rproc. I did a simplified tutorial on a PRU hello world with rproc: https://gist.github.com/jadonk/2ecf864e1b3f250bad82c0eae12b7b64

6

Hello, I am getting some issues to setup the libpruio to work with C. I am following this tutorial http://users.freebasic-portal.de/tjf/Projekte/libpruio/doc/html/_cha_preparation.html

I’ have enabled the PRU

and I am trying to install libpruio following the step 3 from the tutorial but i got this error

I am doing some wrong?

Still, Is the tutorial working for this kernel?

Regards

Dario

7

You can't mix and match u-boot/kernel overlays, in /boot/uEnv.txt

add:

uboot_overlay_addr4=/lib/firmware/libpruio-0A00.dtbo

Regards,

8

Hi Dario!

Once you get the dtbo running, you’ll find out that neither pinmuxing nor PWM output from PWMSS will work with libpruio-0.2. Some paths in sysfs changed between kernel versions 3.8 and 4.x (related to pinmuxing). And the clock setting for the PWMSS changed. After all, libpruio-0.2 will work best with 3.8 kernel versions.

I can provide my current source libpruio-0.4. It’s prepared for 3.8 and 4.x kernel sysfs, has some more features (ie. TIMER and QEP). Software works OK, but docu isn’t finished yet. In order to get PWM working, it needs some changes in the default device tree. And you’ll have to compile the source on your system. (I can provide email support in case of trouble.)

Let me know if you’re interested.

Regards

9

Yes, I am interested, I will work with the ADC converter, but I would also like to use the PWM output

Thanks

Darío

10

OK, I uploaded the (experimental) stuff at https://github.com/DTJF/libpruio.

Find some hints on preparation in file https://github.com/DTJF/libpruio/blob/master/src/doc/_2_preparation.md.

I guess the package installation wont work, so you should follow the guide for experts (section Tools {#SecTools} and following).

Please give some feedback (trouble or success).

Regards

11

I just found out that the instructions for getting the PWM output is missing.

Please do the installation and package building first. Once done, I’ll explain how to adapt the default device tree for PWMSS.

Regards

12

Hi,

I am interested in use libpruio, and I would like to know if you were able to use it in that kernel version.
I will work with the ADC too, so maybe you can give some advice to install the libpruio and how to use it.

PD: I’m using this kernel version: “Linux beaglebone 4.4.82-bone19 #1 Mon Aug 14 21:56:51 UTC 2017 armv7l GNU/Linux”

13 
Hi Jaime!

In one project I've libpruio-0.4 running on

 4.4.22-bone13

It should be possible to run it (version 0.4) on your kernel version as
well. But it's a mess to install on 4.x kernel versions (recompiling of
inertial device tree is necessary to get all PWM working). And I didn't
finish the docu yet.

So if you want a precompiled binary and complete docu, you'll have to
switch to a 3.8 kernel version with libpruio-0.2.

Otherwise, you can download and compile the libpruio-0.4 source here

  

Regards.