Quote illustration - for HAL

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.

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

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.

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.

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.

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.

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

net e-stop-in and.0.in1
net x-limit and.0.in2
net and.0.out parport.0.pin1-out
Something like that

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.

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.