Lost Step Counter

andypugh
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8 years 2 weeks ago #118726 by andypugh

Replied by andypugh on topic Lost Step Counter

This seems to work.

Save this as a file called "miss_step" and make it executable.

Code:

#!/usr/bin/python
import hal, time
import sys
from Tkinter import *
import tkMessageBox

root = Tk()
root.withdraw()
h = hal.component("miss_step")

count = 1
for opt in sys.argv[1:]:
    (dummy, count) = opt.split("=")
    if dummy != "count":
        count = 1

pins = []
for i in range(int(count)):
    p1 = "axis.%i.pos-cmd" %i
    p2 = "axis.%i.motor-pos-cmd" %i
    d = 0
    t = [p1, p2, d]
    pins.append(t)
    h.newpin(p1, hal.HAL_FLOAT, hal.HAL_IN)
    h.newpin(p2, hal.HAL_FLOAT, hal.HAL_IN)
    
h.ready()
try:
    flag = False
    while 1:
        time.sleep (1)
        for t in pins:
            if h[t[0]]-h[t[1]] != t[2]:
                flag = True
            t[2] = h[t[0]]-h[t[1]]
        if flag == True:
            flag = False
            message = ""
            for t in pins:
                message = message + t[0] + " = %f\n"%t[2]
            ret = tkMessageBox._show("Homing Position Differs",
                            message,
                           tkMessageBox.QUESTION, tkMessageBox.OK)
            root.update()
except KeyboardInterrupt:
    raise SystemExit

Then load it in the HAL file

Code:

loadusr miss_step count=3

Then in the HAL file connect the pins for each axis

Code:

net check0 miss_step.axis.0.pos-cmd  axis.0.pos-cmd
net Xpos miss_step.axis.0.motor-pos-cmd

Or whatever signal axis.0.motor-pos-cmd is linked to

Attachments:

The following user(s) said Thank You: tommylight

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DieselJoe
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8 years 2 weeks ago #118727 by DieselJoe

Replied by DieselJoe on topic Lost Step Counter

Thank you.
Incredible.
I am not familiar with add-ons modules on linuxcnc, but I will work on it this weekend

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DieselJoe
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8 years 2 weeks ago #118889 by DieselJoe

Replied by DieselJoe on topic Lost Step Counter

Hi,
Sorry I'm newbie in Hal files.
I tried what you told me , and also i'am trying to read and understand documents on HAL files.
I made the miss_step file, made it executable (chmod -x right ?)
positioned the file in /.../linuxcnc/configs/ma-machine

then added in custom.hal :

loadusr miss_step count=3
net check0 miss_step.axis.0.pos-cmd axis.0.pos-cmd
net Xpos miss_step.axis.0.motor-pos-cmd

Is it the right procedure ?
I have a lot of errors and linuxcnc doesn't want to launch

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andypugh
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8 years 2 weeks ago #118890 by andypugh

Replied by andypugh on topic Lost Step Counter

I think that the python file needs to go in usr/bin/linuxcnc
(or you can give the complete path to the file in the loadusr statement)

Can you attach the error listing?

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DieselJoe
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8 years 2 weeks ago #118892 by DieselJoe

Replied by DieselJoe on topic Lost Step Counter

Debug file information:
.
./custom.hal:3: Warning: File contains DOS-style line endings.
./custom.hal:4: Pin 'miss_step.axis.0.pos-cmd' does not exist
7165
PID TTY STAT TIME COMMAND
Stopping realtime threads
Unloading hal components

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DieselJoe
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8 years 2 weeks ago #118898 by DieselJoe

Replied by DieselJoe on topic Lost Step Counter

I have to mention that I am running this test on a small laptop which is not my actual cnc PC, and has no real parallel port.
Linuxcnc version 2.7.8

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