> From: Chris Albertson [mailto:albertson.ch...@gmail.com] > > For me this was a good example. I wanted to write a userspace > pendent interface. Assuming you have created a pin object as "h", the > pin's input is read as h.in and you can set h.out to set the output. The > link below is a sample program that copies a pin's input to its output. So > it shows both reading and writing. > http://linuxcnc.org/docs/html/hal/halmodule.html#_driving_bidirectional_hal_io_pins >
The key thing is the python hal component. Do you know where the source code is for that? John > On Wed, Dec 16, 2020 at 3:41 PM <ken.stra...@gmail.com> wrote: > > > With the great help on list and off I'm having some progress. > > > > When debugging it is very convenient to be able to run a program in a > > terminal window. Doing so immediately shows syntax errors. The program can > > talk to an Arduino listening on a USB simulated serial port and can create > > pins that can be displayed or set in halcmd. A ctrl-C closes things. The > > only remaining problem is that I have not found a way to read values from > > existing HAL pins in order to get axis positions and other useful > > information. Halcmd and other programs can display the value of any pin. Is > > reading pins created by another program not supported in python or am I > > just missing a vital incantation? > > > > > > > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > > -- > > Chris Albertson > Redondo Beach, California > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
