Rpi4 HAL question

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18 Aug 2021 12:54 #218071 by CatoFu
Rpi4 HAL question was created by CatoFu
Hello,

I am a beginner of LinuxCNC and trying to set up a machine with Rpi4 and prefer to use its GPIO for pulse generator just for my understanding LinuxCNC architecture.
I installed 
www.linuxcnc.org/iso/linuxcnc-2.8.1-pi4.zip
and
github.com/LinuxCNC/linuxcnc/blob/master...hal_pi_gpio_demo.hal
.
The hal_pi_gpio_demo.hal works and I confirmed each axis step pulses are generated.

In the file, there is a line that I cannot understand, which is 
loadrt hal_pi_gpio dir=78855 exclude=32918520
.
I understand loadrt hal_pi_gpio, but do not dir=78855 exclude=32918520.
Could anyone please explain what the numbers mean?

Thank you

Cato 

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18 Aug 2021 15:29 #218078 by PCW
Replied by PCW on topic Rpi4 HAL question
What does the manual page for hal_pi_gpio say?

I suspect those numbers are masks that set which GPIO pins are outputs (dir)
and which GPIO setup bits to leave unchanged (excluded)

The numbers would make more sense in hexadecimal

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18 Aug 2021 19:36 #218090 by elovalvo
Replied by elovalvo on topic Rpi4 HAL question

Hello,

I am a beginner of LinuxCNC and trying to set up a machine with Rpi4 and prefer to use its GPIO for pulse generator just for my understanding LinuxCNC architecture.
I installed 
www.linuxcnc.org/iso/linuxcnc-2.8.1-pi4.zip
and
github.com/LinuxCNC/linuxcnc/blob/master...hal_pi_gpio_demo.hal
.
The hal_pi_gpio_demo.hal works and I confirmed each axis step pulses are generated.

In the file, there is a line that I cannot understand, which is 
loadrt hal_pi_gpio dir=78855 exclude=32918520
.
I understand loadrt hal_pi_gpio, but do not dir=78855 exclude=32918520.
Could anyone please explain what the numbers mean?

Thank you

Cato 


Look this post
forum.linuxcnc.org/27-driver-boards/3770...erry-pi-gpios#157180

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19 Aug 2021 13:02 #218140 by CatoFu
Replied by CatoFu on topic Rpi4 HAL question
Hello PCW,

Thank you for your help.

Now I understand what the number means.
As you mentioned there are some lines which commented out on the file.
It says;
# 0 0 0 0 0 0 0 0 0 1 0 0 1 1 0 1 0 0 0 0 0 0 0 1 1 1 dir mask (0 means in 1 means out) dec 78855
# 0 1 1 1 1 1 0 1 1 0 0 1 0 0 1 0 1 1 1 1 1 1 1 0 0 0 exclude mask (0 means use 1 means dont use) dec 32918520

I did not even know what the dec means and now I have leaned.

Thank you so much!
Have a good day!

Cato

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16 Oct 2021 07:51 #223282 by diy
Replied by diy on topic Rpi4 HAL question
Write software, you can try
Attachments:

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16 Oct 2021 07:55 #223283 by diy
Replied by diy on topic Rpi4 HAL question
download
Attachments:

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17 Oct 2021 14:36 #223383 by CatoFu
Replied by CatoFu on topic Rpi4 HAL question
Thank you elovalvo!

Cato

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17 Oct 2021 14:37 #223384 by CatoFu
Replied by CatoFu on topic Rpi4 HAL question
Thank you diy!
I will try it.

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19 Oct 2021 15:22 #223566 by ChanceTran
Replied by ChanceTran on topic Rpi4 HAL question
Hi.....I had a similar inquiry. Just honestly, would you say you are saying that there is still no rest mode for the Pi 4?

Absence of a genuine rest mode is the thing that's kept me from utilizing a Pi for a very long time in the course of the most recent few years - it essentially forestalls battery-fueled applications. Is there some endemic component that would be broken by adding a genuine profound rest mode, one that doesn't need closure or end? Is the Pi just continually going to be that way?

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19 Oct 2021 23:05 #223602 by BigJohnT
Replied by BigJohnT on topic Rpi4 HAL question
I have a configuration tool for this, 64 bit today but soon to add a 32 bit.
github.com/jethornton/rpi_gpio

JT
The following user(s) said Thank You: elovalvo

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