Quote illustration - for HAL

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21 Apr 2020 15:54 - 21 Apr 2020 15:56 #164976 by zz912
Dear Mr. Mrs,

I would like to offer you a picture for the HAL chapter:

linuxcnc.org/docs/2.8/html/hal/intro.html



You might like to use it. Nothing in the picture was overused. I drew a picture in CAD. I can add a potentiometer to represent the parameter.
Attachments:
Last edit: 21 Apr 2020 15:56 by zz912. Reason: I forgot picture.
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22 Apr 2020 09:12 #165057 by bbsr_5a
this drives New people crazy as it suggests hardware Cabeling


HAL is Virtual Software giving the Real PIN a usefull Name
and connecting it to the Virtual Controll Pin inside the CNC controll

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22 Apr 2020 10:13 #165068 by zz912
Replied by zz912 on topic Quote illustration - for HAL
I inspired by:
"HAL is based on the same principles that are used to design hardware circuits and systems, so it is useful to examine those principles first."
, but I understand it can be confusing.

Nothing happened, it was just a suggestion.

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22 Apr 2020 11:50 #165077 by tommylight
That is a nice way to look at has stuff, but it needs a bit more work.
There are a lot of things in hal that are looked at from their point of view, so an input in hal can be an output and vice versa. That would be nice to have illustrated, makes it much easier to figure out what is going on.

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22 Apr 2020 12:52 #165097 by zz912
Replied by zz912 on topic Quote illustration - for HAL
I am a mechanical designer and mechanical designers communicate by pictures(drawings) with each other.

"but it needs a bit more work"
What do you mean?

I should make more picture, when there is interest. Many things in one picture are confusing.

There may be a problem with mistaking it for a hardware pin. It didn't occur to me.
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22 Apr 2020 13:04 #165099 by tommylight
Take a simple component, like an AND gate with inputs and outputs wired, that will be a better representation of it.
One of the AND inputs wire to the E-stop and the other to something like an limit switch, output wired to a physical pin on parallel port or Mesa board.
So basically, without E-stop being OFF and the limit switch not triggered there is not output , and if the machine triggers the limit switch while working, it will shut off that output. Same if the E-stop is pressed.

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22 Apr 2020 13:24 #165100 by zz912
Replied by zz912 on topic Quote illustration - for HAL
What you are writing about could be a suggestion for more pictures. In this first picture I just wanted to show what is component, pin, signal + parameter.

I would explain at maximum what the "net" command is.


Could you write me what you mean in HAL?

net signal-and2.0.in0 hm2_7i96.0.gpio.000.in => and2.0.in0
net signal-and2.0.in1 XXXXXX => and2.0.in1

net estop-signal and2.0.out => hm2_7i96.0.ssr.00.out-00
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22 Apr 2020 14:03 #165104 by tommylight
net e-stop-in and.0.in1
net x-limit and.0.in2
net and.0.out parport.0.pin1-out
Something like that

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22 Apr 2020 14:04 #165105 by tommylight

zz912 wrote:
net signal-and2.0.in0 hm2_7i96.0.gpio.000.in => and2.0.in0
net signal-and2.0.in1 XXXXXX => and2.0.in1

net estop-signal and2.0.out => hm2_7i96.0.ssr.00.out-00

That should also work.

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25 Apr 2020 01:37 #165467 by cmorley
I very much like your illustration, I think it quickly shows the HAL concept.
I would like to incorporate it in the manual.
But i wonder if you could change the text a bit.

component.0.pin0-out, component.0.pin1-out etc
component.1.pin0-in, component.0.pin1-in etc

Would be clearer of direction.

Also aligning the pin names with the connectors would be clearer too.
I'm thinking component.0.pin0.out on the left side of the comp 0 's connector and component.1.pin0.in on the right side of comp 1's connector (aligned with each screw terminal)

I hope I'm being clear enough.
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