Python Component issueing errors or warnings to LinuxCNC

Roiki
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5 years 5 months ago #207625 by Roiki

Replied by Roiki on topic Python Component issueing errors or warnings to LinuxCNC

You can read the nml source. There are messages for error messages there. They are used internally by the application but are not included in the linuxcnc.command method for sending them on the command channel to the nml error channel. As Andy Pugh pointed out.

I haven't looked at the source enough to see if these would be difficult to implement or not. Or if they exist on the c++ api that's under the python one.

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Stormholt
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5 years 5 months ago #208108 by Stormholt

Replied by Stormholt on topic Python Component issueing errors or warnings to LinuxCNC

I don't know if its a very elegant way but, for my axis tabs I have created a hal pin only to print an error/warning using the "message" hal real time component.

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cmorley
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5 years 5 months ago #208500 by cmorley

Replied by cmorley on topic Python Component issueing errors or warnings to LinuxCNC

So I slapped together some code to test with:

Code:

PyObject *MESSAGE_(pyErrorChannel *s,  PyObject *args ) {
    char *m;
    EMC_OPERATOR_DISPLAY operator_display_msg;

    if(!PyArg_ParseTuple(args, "s", &m)) return NULL;
    if(!s->c->valid()) {
        PyErr_Format( error, "Error buffer invalid" );
        return NULL;
    }
    operator_display_msg.id = 0;
    strncpy(operator_display_msg.display, m, LINELEN);
    operator_display_msg.display[LINELEN - 1] = 0;
    s->c->write(operator_display_msg);
    Py_RETURN_NONE;
}

static PyMethodDef Error_methods[] = {
    {"poll", (PyCFunction)Error_poll, METH_NOARGS, "Poll for errors"},
    {"MESSAGE_", (PyCFunction)MESSAGE_, METH_VARARGS, "Send message"},
    {NULL}
};

and the message is accepted but never sent it seems.
I can't find much examples of sending messages on the error channel other then emctaskmain.cc

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Roiki
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5 years 5 months ago #208549 by Roiki

Replied by Roiki on topic Python Component issueing errors or warnings to LinuxCNC

I don't think you send it on the error channel but the command channel. Try it that way and see what happens?

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cmorley
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5 years 5 months ago #208560 by cmorley

Replied by cmorley on topic Python Component issueing errors or warnings to LinuxCNC

Yes that did the trick - thanks.
Unfortunately all display messages can only be accepted in auto mode.

There is an NML_ERROR message but I don't understand how to send this NML message

More research needed..

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cmorley
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5 years 5 months ago #208605 by cmorley

Replied by cmorley on topic Python Component issueing errors or warnings to LinuxCNC

Well it seems EMC_OPERATOR_ERROR_TYPE messages can be made to always display by modifying emctaskmain.cc to accept them.

I just don't understand if there is a disadvantage to always accepting them.

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andypugh
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5 years 5 months ago #208654 by andypugh

Replied by andypugh on topic Python Component issueing errors or warnings to LinuxCNC

Do it and see who complains? :-)

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cmorley
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5 years 5 months ago #208673 by cmorley

Replied by cmorley on topic Python Component issueing errors or warnings to LinuxCNC

lol You know you are right.
Thanks Andy

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cmorley
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5 years 5 months ago #208679 by cmorley

Replied by cmorley on topic Python Component issueing errors or warnings to LinuxCNC

Ok in master you can use python's linuxcnc module to send messages to the operator.

Code:

import linuxcnc
c = linuxcnc.command()

c.error_msg('Error')
c.text_msg('Text')
c.display_msg('Display')

Please let me know if you test it.

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mwinterm
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5 years 5 months ago #208737 by mwinterm

Replied by mwinterm on topic Python Component issueing errors or warnings to LinuxCNC

Hello @cmorley,

just tried it out. Works like a charm

Exactly what I was looking for.

Thank you very much!

Regards,

Marc

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