Switching to root before doing sysfs operations, (e.g. sudo su), typically seems to work for me..
On Friday, February 2, 2018 at 12:01:43 PM UTC-6, Hemant Kapoor wrote: > > Hello, > > Yet another newbie question. > > I have got latest debian image on my beagle bone black. > uname - r output: 4.9.45-ti-r57 > > and I noticed various gpio directory in /sys/class/gpio > > when I tried > echo 69 > unexport > it gave me permission denied. > so I changed the permission of unexport file to be 666 > > and now when I try to use the same command it gives me an error: > -bash: echo: write error: Invalid argument > > Can anyone please help... > > Ultimately I want to develop a C++ project to toggle LED which is > connected to one of the pins... > > Any help regarding this matter is deeply appreciated. > > Regards, > Hemant Kapoor > -- 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/36fcc8b7-726d-42d0-ba04-a219dffc7a46%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
