Have you turned off GPIO options in kernel settings? This is the TI official guide (assuming you are running Linux): http://processors.wiki.ti.com/index.php/Linux_PSP_GPIO_Driver_Guide
On Sat, Nov 3, 2018 at 6:48 PM not you <[email protected]> wrote: > I keep running into this error when running a code after booting up. The > code write to certain GPIO under /sys/class/gpio. It complains: > > No such file or directory > > I reset the BBB and run `ls` inside /sys/class/gpio. Apparently, the > selected GPIO's are not there. After the aforementioned code is executed > (and the same errors are thrown), I run `ls` again. This time, the > required GPIO's are there. Could someone explain to me why they do not > initially exist, and what makes them show up afterwards? Thank you in > advance. > > -- > 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 [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/beagleboard/aa24f687-2c91-40c6-a1b2-023660306104%40googlegroups.com > <https://groups.google.com/d/msgid/beagleboard/aa24f687-2c91-40c6-a1b2-023660306104%40googlegroups.com?utm_medium=email&utm_source=footer> > . > For more options, visit https://groups.google.com/d/optout. > -- Yiling Cao http://umine.io/ <http://umie.io/> http://ariaboard.com/ http://shanghainovotech.com/ -- 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 [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/CAMMUdpJCOGuZvk4vNdtwMykjSS8knzsxNcaSnJAZtZ15SrKFYA%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
