Import pin value in handler.py

Hello,

I'm still fairly new to LinuxCNC and QTVCP. I'm trying to modify the QTDragon GUI.

I added a status label and a progress bar using Qt5.
In handler.py, I added the following lines, and I can display the value:
- self.w.OilPumpPositionGage.setValue(int(multiplied_pwm_value))
- self.w.OilPumpPositionValue.setText(f"{multiplied_pwm_value:.2f} %")

My issue is that I would like multiplied_pwm_value = pwmgen.0.value * 100 but I can't figure out how to access the "pmw.0.value" value from handler.py

I tried working with the "newpin" function, but it's not working.


Where can I find information on how to do this, or could someone point me in the right direction?Thanks in advance

if the pin value you wish to read is not created in the qtvcp handler then you must either connect to the pin or read it directly.

to read it directly:
pwmValue = self.h.hal.get_value('pwmgen.0.value')
use the full HAL name.

Otherwise you must make a qtdragon pin and connected it in a HAL file to the pwmgen pin.

Hopefully that helps.

Thank you for your response. The line pwmValue = self.h.hal.get_value('pwmgen.0.value') is working well.

However, I’m having trouble with the QPushButton (or Action button). I’m not receiving any callback when it’s clicked.

Did you set any callback in designer or in the handler?

I finally found the "Signal/Slot Editor" in Qt, and the callback is now working.

Is : halcmd show pin div2.OilPump.in the correct way to write to a pin?

No.
to write to a pin you made in qtdragon handler depends on how you made a reference to it.
for instance if you created the pin like this:
self.myPin = QHAL.newpin("MyPin", QHAL.HAL_BIT, QHAL.HAL_OUT)

then you could use:
self.myPin.set(True)

or it you didn't keep a reference to the pin (the 'self.myPin' part)
self.h.myPin.set(True)

To write to a system pin directly (it can't be connected to anything)
QHAL.setp('qtdragon.myPin','1')

or
self.h.hal.set_p("qtdragon.myPin","1")

It work well using this : self.myPin = QHAL.newpin("MyPin", QHAL.HAL_BIT, QHAL.HAL_OUT)

Thanks a lot for your help