Setting pin value based on other pins
- kubes
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31 May 2025 05:47 #329425
by kubes
Setting pin value based on other pins was created by kubes
I am using mb2hal (modbus) and it exposes a pin `mb2hal.00.00.int` that is an input, the values can be 1, 2, or 5. I need to set the values based on other bit pin:
if spindle.0.forward = true then mb2hal.00.00.in = 1
if spindle.0.reverse = true then mb2hal.00.00.in = 2
if spindle.0.on = false then mb2hal.00.00.in = 5
How do I create this logic in the hal?
if spindle.0.forward = true then mb2hal.00.00.in = 1
if spindle.0.reverse = true then mb2hal.00.00.in = 2
if spindle.0.on = false then mb2hal.00.00.in = 5
How do I create this logic in the hal?
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- juliankoenig87
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31 May 2025 07:00 #329426
by juliankoenig87
Replied by juliankoenig87 on topic Setting pin value based on other pins
One easy way is to use a mux8:
linuxcnc.org/docs/2.5/html/man/man9/mux8.9.html
This way you can net your three spindle signals to the three selections of the mux and you can define your modbus values to the corresponding inputs of the mux.
linuxcnc.org/docs/2.5/html/man/man9/mux8.9.html
This way you can net your three spindle signals to the three selections of the mux and you can define your modbus values to the corresponding inputs of the mux.
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- rodw
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31 May 2025 09:21 #329434
by rodw
Replied by rodw on topic Setting pin value based on other pins
Look at the example in the docs for a MPG for axis selection and scaling. I think there is also a MUX4
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- juliankoenig87
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31 May 2025 13:01 #329441
by juliankoenig87
Replied by juliankoenig87 on topic Setting pin value based on other pins
Yes there is a mux4. But then you will one have 2 selction bits and he needs three. Assuming there is a fourth state where nothing is active otherwise mux4 is doable I would say.
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- kubes
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31 May 2025 18:34 - 31 May 2025 18:36 #329460
by kubes
Replied by kubes on topic Setting pin value based on other pins
Thanks! mux4 worked.
In case others need it, here is my solution:
In case others need it, here is my solution:
loadusr -Wn modbus mb2hal config=mb2hal-gt.ini
loadrt mux4 count=1
addf mux4.0 servo-thread
# esnure all is stopped! (int and float are add together and the result is sent to modbus)
setp modbus.vfd.command.int 0
setp modbus.vfd.command.float 5
# set the logic of that command to send the vdf
# 5 = stop, 1 = forward, 2 = reverse
setp mux4.0.in0 5
setp mux4.0.in1 1
setp mux4.0.in2 2
setp mux4.0.in3 5
net vfd-cmd1 mux4.0.sel0 <= spindle.0.forward
net vfd-cmd2 mux4.0.sel1 <= spindle.0.reverse
net vfd-command modbus.vfd.command.float <= mux4.0.out
net spindle-speed-fb <= modbus.vfd.status.rotation_speed.float
Last edit: 31 May 2025 18:36 by kubes.
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