Add HAL Pins to GUI
06 Feb 2024 13:26 - 06 Feb 2024 13:29 #292645
by JT
Add HAL Pins to GUI was created by JT
I have a simple GUI and I'm trying to add a HAL pin.
But after running this and opening up showhal I don't see the pin... what am I missing?
I've grepped all the linuxcnc code and searched the forum for a clue but come up empty handed...
JT
def setup_hal(parent):
c = hal.component("buttons")
c.newpin('out', hal.HAL_BIT, hal.HAL_OUT)
c.ready()But after running this and opening up showhal I don't see the pin... what am I missing?
I've grepped all the linuxcnc code and searched the forum for a clue but come up empty handed...
JT
Last edit: 06 Feb 2024 13:29 by JT.
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06 Feb 2024 13:37 #292646
by cmorley
Replied by cmorley on topic Add HAL Pins to GUI
Are you sure the function is being called?
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06 Feb 2024 13:43 #292647
by JT
Replied by JT on topic Add HAL Pins to GUI
Thanks for replying Chris.
If I add a print function like this:it prints to the terminal.
JT
If I add a print function like this:
def setup_hal(parent):
print('here')
c = hal.component("buttons")
c.newpin('out', hal.HAL_BIT, hal.HAL_OUT)
c.ready()JT
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06 Feb 2024 13:43 #292648
by JT
Replied by JT on topic Add HAL Pins to GUI
There is an odd component I think showing up in halshow.
JT
JT
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06 Feb 2024 13:45 #292649
by JT
Replied by JT on topic Add HAL Pins to GUI
Hmm it shows up even if I don't run that function so I assume it's part of Lcnc.
JT
JT
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06 Feb 2024 13:54 - 06 Feb 2024 13:55 #292654
by cmorley
Replied by cmorley on topic Add HAL Pins to GUI
I wonder if it's because c is a local variable and is garbage collected. try:
c= None
def setup_hal(parent):
print('here')
global c
c = hal.component("buttons")
c.newpin('out', hal.HAL_BIT, hal.HAL_OUT)
c.ready()
Last edit: 06 Feb 2024 13:55 by cmorley.
The following user(s) said Thank You: JT
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06 Feb 2024 13:55 #292655
by JT
Replied by JT on topic Add HAL Pins to GUI
If I add a test to see if the component exists it returns True
JT
def setup_hal(parent):
c = hal.component("buttons")
c.newpin('out', hal.HAL_BIT, hal.HAL_OUT)
c.ready()
print(hal.component_exists("buttons"))JT
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06 Feb 2024 13:58 #292657
by JT
Replied by JT on topic Add HAL Pins to GUI
Chris, thanks so much. You nailed it, c was garbage collected!
JT
JT
The following user(s) said Thank You: cmorley
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