Am 16.03.2014 um 20:40 schrieb andy pugh <bodge...@gmail.com>:
> Just to reiterate the initial point, the current situation is that IO
> pins can not be directly connected to any GUI elements, either for
> display or setting.
I pushed the gladevcp HALIO_HSscale widget to master to encourage exploration
of the issue; that takes care of changing a HAL_IO pin from a UI
however, there is one more problem: the moment you link an HAL_IO pin which has
a value preset (like pid.0.Pgain set to 1) to a signal (which defaults to 0),
the preset value is lost.
I dont see how halcmd can make a signal inherit the value from such a preset
pin, or read a pin value, preset the signal, and link _then_.
See here:
mah@wheezy:~/linuxcnc-next/configs/sim/gladevcp$ halcmd -f -k
halcmd: loadrt pid
halcmd: show pin pid.0.Pgain
Component Pins:
Owner Type Dir Value Name Epsilon Flags
32770 float I/O 1 pid.0.Pgain 0.000000 0
halcmd: net foo pid.0.Pgain pid.0.Pgain
halcmd: show pin pid.0.Pgain
Component Pins:
Owner Type Dir Value Name Epsilon Flags
32770 float I/O 0 pid.0.Pgain 0.000000 0 <=> foo
------------------------------^
That all makes sense in the HAL logic, it's just useless for preset parameters.
from thereon the HALIO_HScale does what it is supposed to do:
(start gladevcp ioscale.ui which contains a single HALIO_HScale widget):
halcmd: net foo ioscale.halio_hscale1
halcmd: show sig foo
Signals:
Type Value Name (linked to)
float 0 foo
<=> ioscale.halio_hscale1
<=> pid.0.Pgain
(move gladevcp scale slider to 20)
halcmd: show sig foo
Signals:
Type Value Name (linked to)
float 20 foo
<=> ioscale.halio_hscale1
<=> pid.0.Pgain
I guess some more thought is needed for making preset parameter pins work in a
form which makes sense.
One possible route is a variant of the halcmd net statement which sets the
signal value to the pin's value. There might be others, but that may be harder
to do in halcmd.
any suggestions?
- Michael
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