Hello, I should probably explain that I'm a linux and BBB novice, and am currently experiencing a crazily steep learning curve. So please bear with me while I ask what are probably incredibly rudimentary questions...
I'm interested in doing some realtime control (servos, reading encoders etc) on my BBB rev C under Xenomai, and after some reading around it seemed like the simplest way to get started was using the pre-built machinekit images found here: http://elinux.org/Beagleboard:BeagleBoneBlack_Debian#BBW.2FBBB_.28All_Revs.29_Machinekit So, having installed this image I can now ssh into the BBB from a Xubuntu install running under VMware on my PC. I thought a good place to start would be blinking an LED. To that end I've compiled the C++ program here <http://inspire.logicsupply.com/2014/07/beaglebone-c-programming-example.html>, which works (only) if I use sudo, i.e. sudo ./myprog. I've also tried turning them on and off at the command line as outlined on Derek Molloy's site <http://derekmolloy.ie/beaglebone-controlling-the-on-board-leds-using-c/>, but this doesn't work: cd /sys/class/leds cd beaglebone:green:usr0 echo none > trigger -bash: trigger: Permission denied sudo echo none > trigger doesn't work either... What am I doing wrong? Also more generally, is this approach of accessing LEDs and GPIOs through the file system the right way to go if I'm interested in doing things quickly? Intuitively it feels like it'd be slow - is there another way? Incidentally this <https://hackaday.io/project/12827-double-pendulum-cart> is what I'm aiming to do eventually. Thanks for any help, it's appreciated! Luke -- website: http://www.machinekit.io blog: http://blog.machinekit.io github: https://github.com/machinekit --- You received this message because you are subscribed to the Google Groups "Machinekit" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. Visit this group at https://groups.google.com/group/machinekit. For more options, visit https://groups.google.com/d/optout.
