Thanks for the replies everyone--looks like some nice libraries to check out.
Regarding memory mapped GPIO, check out this nice blog post for more info: http://vabi-robotics.blogspot.com/2013/10/register-access-to-gpios-of-beaglebone.html You can effectively map the GPIO registers to a process' memory space and directly access them so there's no overhead of making the system calls to read, write, etc. the sysfs-based GPIO. I actually just tried out a couple quick tests and saw toggling a pin high and low in a tight loop with sysfs is pretty slow, only a few hunded khz. However using memory mapped GPIO registers it's much, much faster. I'm seeing around 2.8 mhz toggling a pin with this approach. Now neither approach is technically going to ever give you a real time guarantee of course, but it's nice to have the ability to read and write GPIO fairly quickly in some cases with memory mapped GPIO. On Wed, Jun 4, 2014 at 5:00 AM, Micka <mickamus...@gmail.com> wrote: > William Hermans, how did you controlled the GPIO ? > > The only way that I know is with : > > > /sys/class/gpio/gpio%d/value > > > but you talk about mmap ? How did you use it with this > /sys/class/gpio/gpio%d/value ? > > Thx you, > > Micka, > > > > > On Tue, Jun 3, 2014 at 11:57 PM, William Hermans <yyrk...@gmail.com> > wrote: > >> sysfs, and mmap. I've seen mention of both on the web ( including for the >> BB white ). >> >> *wiringPi* >>> >> >> Whats this ? The Arduino IDE for the rPI ? Nothing like this exists for >> the BBB that I am aware of. >> >> >> On Tue, Jun 3, 2014 at 2:45 PM, Jacek Radzikowski < >> jacek.radzikow...@gmail.com> wrote: >> >>> <shameless plug> >>> https://github.com/piranha32/IOoo >>> </shameless plug> >>> >>> j. >>> >>> >>> On Tue, Jun 3, 2014 at 5:42 PM, Tony DiCola <t...@tonydicola.com> wrote: >>> > Sorry if this is a common question, but I've searched around the web >>> and the >>> > forum here and am curious are there any somewhat mature or popular >>> libraries >>> > for simple digital GPIO access on the Beaglebone Black in C/C++? I'm >>> > curious if there's anything like wiringPi or similar for the BBB yet. >>> If >>> > not, are folks just rolling their own thing with access to sysfs or >>> mmap? >>> > >>> > -- >>> > 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. >>> > For more options, visit https://groups.google.com/d/optout. >>> >>> >>> >>> -- >>> Given a choice between two theories, take the one which is funnier >>> >>> -- >>> 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. >>> For more options, visit https://groups.google.com/d/optout. >>> >> >> -- >> 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. >> For more options, visit https://groups.google.com/d/optout. >> > > -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to a topic in the > Google Groups "BeagleBoard" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/beagleboard/Mef65w6PZ7s/unsubscribe. > To unsubscribe from this group and all its topics, send an email to > beagleboard+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/d/optout. > -- 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. For more options, visit https://groups.google.com/d/optout.
