For anyone who was curious, I figured this out last night and it turned out to be a lot easier than I thought. Basically, all I needed to do was use the MPG howto from the wiki ( http://wiki.linuxcnc.org/cgi-bin/emcinfo.pl?Hooking_Up_A_MPG_Pendant), and instead of mapping the encoder inputs to the parallel port pins, I created a phaseA and phaseB pin in my Python HAL component, and mapped to those. For once, everything actually worked on the first try.
I did notice one small error on the wiki page, which was the omission of 'setp' in the calls to set axis.N.jog-vel-mode. I edited the page to add this. On Tue, Sep 28, 2010 at 1:14 PM, Colin Kingsbury <ckingsb...@gmail.com>wrote: > So, thanks to an assist from Jeff Epler and Chris Radek, I've gotten my > Arduino->HAL interface more or less fully functional with both inputs and > outputs. My purpose for this is to build a human-machine interface (read: > control panel for my mill). So far I've gotten it to turn input pins in > HALUI on and off, and turn external LEDs on and off based on the status of > output pins. > > What I'm wondering about is how best to work an encoder into this. > Currently, the way I'm doing it is to have the arduino read the encoder > outputs and convert them to a signal which represents one pulse in the CW or > CCW direction. The Python script receives the signal, and then jogs the > appropriate axis in the + or - direction for 1/10th of a second. So far, the > motion seems smooth (on screen, I haven't tried it on one of my machines > yet), but I'm wondering if there's a better way. The catch is that I'd like > to keep this on the serial connection, both to save the parallel port pins, > and also for the elegance of being able to do everything over the Arduino's > USB cable. > ------------------------------------------------------------------------------ Start uncovering the many advantages of virtual appliances and start using them to simplify application deployment and accelerate your shift to cloud computing. http://p.sf.net/sfu/novell-sfdev2dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
