PID Pin Problems

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15 years 9 months ago #6487 by malleblas
PID Pin Problems was created by malleblas
Code:
halcmd: loadrt pid halcmd: show pin pid.0.*gain pid.0.feedback pid.0.error Component Pins: Owner Type Dir Value Name 3 float I/O 0 pid.0.Dgain 3 float I/O 0 pid.0.Igain 3 float I/O 1 pid.0.Pgain 3 float OUT 0 pid.0.error 3 float IN 0 pid.0.feedback halcmd: net some-sig <= pid. => pid.0.error halcmd: net some-sig <= pid.0.Pgain => pid.0.error <stdin>:2: Signal 'some-sig' can not add OUT pin 'pid.0.error', it already has I/O pin 'pid.0.Pgain' halcmd: net some-sig <= pid.0.feedback => pid.0.error halcmd:

Never mind the fact that connecting the error output to either Pgain or feedback is non-sensical, I am using it as an example. In my actual configuration, I am connecting an OUT pin from a pyVCP GUI to Pgain and getting the same error. I cannot see any reason why any of the *gain inputs are listed as input/output pins. Could anyone provide more information as to why, and if there is no good reason, should they be changed? For the standard configuration where a value is fed direct from the INI file using setp, it is fine, but I am trying to make a GUI which aids in PID tuning.

-Mikey

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15 years 9 months ago #6489 by malleblas
Replied by malleblas on topic Re:PID Pin Problems
I have a quick fix for anyone facing the same problem. I created a new component called "passthru"

Code:
michael@cnc:~$ cat passthru.comp component passthru "Joins OUT to I/O pins"; pin in float in; pin io float out; function _; license "GPL"; ;; FUNCTION(_) { out = in; } michael@cnc:~$ sudo comp --install passthru.comp

To use, just place this in between the two components with interfacing issues.
Code:
halcmd: loadrt passthru halcmd: addf passthru.0 SOME-THREAD halcmd: out-sig <= OUT-PIN => passthru.0.in halcmd: io-sig <= passthru.0.out => IO-PIN

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5 years 2 months ago #219205 by C_M_H
Replied by C_M_H on topic Re:PID Pin Problems
Thanks for posting this. I just used this technique and it worked great.

Was banging my head against a wall for awhile until I found it.

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