*Some glimmer of hope*: I was able to get my Python code running, at least for a few seconds. I put an icon of sorts on the BBB Debian desktop; the icon/shortcut called an sh that started my Python code using sudo python myProg.py. But unfortunately it shut down in a few seconds and an LXDE window showed up saying something about Shut Down or Cancel or Something Else but the BBB shut down and I was not able to recover from the glitch. I started from the info by Cyril Laury at http://askubuntu.com/questions/299052/how-to-execute-sh-script-from-a-desktop-shortcut and hacked around to make a startup script. So it seems that my Python program is clobbering Debian, possibly with my write to a logfile. But that's to be determined. So hopefully I can fix the problem and then I'll be happy with this means to start up my Python code and will happily forget about crontab's and systemd's. Thanks for all the help and suggestions. You-all kept me going. John
On Wednesday, April 20, 2016 at 11:46:57 AM UTC-7, John Baker wrote: > > Thanks for your help and your patience with me. > Unfortunately, still no joy and no error message but then I'm illiterate > with Linux. > > I forgot to mention that I am using PyBBIO to drive PWM output and to read > ADC channels and it requires me to start my GUI program with sudo python > SimB.py on the Debian terminal and an attached keyboard to the BBB. > > I tried the following, first without the "root" in the command and then > with the "root" in the command as shown in this crontab -l output: > > > > > I will set this aside for now and try systemd, to see if I can get some > kind of error message at least. > John > > On 4/20/2016 5:12 AM, Dennis Lee Bieber wrote: > > On Tue, 19 Apr 2016 21:52:27 -0700 (PDT), John Baker<bakereng...@gmail.com> > <javascript:> declaimed the > following: > > > My Python program SimB.py runs fine if I start it with sudo python SimB.py > using a keyboard attached to my BBB. > > Which, by default, is connected to the X-Window server running on > "localhost" (and which is also connected to the HDMI/LCD output). IOWs, you > have a full graphical environment preset for you, and Tkinter can connect > to the display server. > > > So I gave crontab a try again, putting it in /etc. Here's my crontab and > crontab -l which seems to say my python program is running but I don't see > > A timed background job not connected to any form of console/display. > > > that it has done anything, don't see anything running on my BBB 4DCAPE > screen. I saw something in the CronHowTo () page about GUI's but haven't > tried that yet, figuring that I would just try to start SimB.py and see > what happened. So what to do next? > > > Uhm... Read that how-to page? Or maybe > this:http://ubuntuforums.org/showthread.php?t=185993 > > > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/c1306397-dc58-4eac-838f-136493510224%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
