GPIO control

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01 Jun 2023 18:44 #272651 by vedatech
GPIO control was created by vedatech
How can I set a GPIO output with a QTvcp button or check box? (I'm using a modified version of QTaxis with qtdesigner)
For instance in .hal I have "hm2_5i25.0.gpio.025.is_output TRUE" and the pin is wired to a power relay but I can't find a way to set it.

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01 Jun 2023 21:53 #272657 by persei8
Replied by persei8 on topic GPIO control
If you select the Linuxcnc Pushbutton widget in designer, qtvcp makes a HAL pin for it that you then connect to your gpio in the post_gui.hal file.
This is not QPushbutton but Pushbutton under the Linuxcnc section. For example, in Qtdragon, I have buttons to turn on relays for a water pump and laser crosshair. The commands in qtdragon_postgui.hal are:
net flood_ouput  iocontrol.0.coolant-flood => hm2_7i96.0.ssr.out-01
net laser_on       qtdragon.btn_laser_on    => hm2_7i96.0.ssr.out-03
Of course, you need to make adjustments for the names to suit your 5i25 board.
Jim

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02 Jun 2023 01:31 #272665 by vedatech
Replied by vedatech on topic GPIO control
Thanks persei8, I did try adding Linuxcnc pushbutton but I didn't connect it in the postgui.hal file. I'll give that a shot as soon as I have time.

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02 Jun 2023 01:34 #272666 by cmorley
Replied by cmorley on topic GPIO control
Jim's suggestion is the most user friendly if you later need to change the pin name, but you can also use the pushbutton to call a function in the handler file or call a python command directly. Either of those could use HAL python module to set pins/params.

in a handler file:
self.h.hal.set_p("pinname","10")

in designer button python command:
HAL.set_p('motion.probe-input','1')

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02 Jun 2023 14:14 #272723 by vedatech
Replied by vedatech on topic GPIO control
Thanks persei8, works like a charm. I didn't realize that:
1. pin names in the button widget are created a startup
2. the new pins must be prefixed by the gui name (<name>.ui) when referenced in
postgui.hal (but not when referenced by other QT widgets)

I didn't see this in the documentation.
Problem solved.

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