> > *You can override them thru userspace:* > > * usr0: for example:* > > * debian@test-bbb-3:/sys/class/**leds/beaglebone:green:usr0$ cat trigger* > * none nand-disk usb-gadget usb-host mmc0 mmc1 timer oneshot [heartbeat]* > * backlight gpio cpu0 default-on* > * debian@test-bbb-3:/sys/class/**leds/beaglebone:green:usr0$ cat > brightness* > * 0* > * debian@test-bbb-3:/sys/class/**leds/beaglebone:green:usr0$ cat > brightness* > * 255* > > * Change trigger to 'none' and just switch the brightness from 0 <-> 255* > * for on/off* >
Ok that I knew of, just was not sure if that was the proper way to do things. I also read an old Dr. Dobbs article where you can echo "gpio_leds" to some unbind file in the debugfs file structure I think it was. Where I'm going with this though is that I want to setup a UIO "driver" using the USR LEDs as a simple UIO example for others to read. In fact, I'm still learning much of this myself but . . . heh On Thu, Nov 19, 2015 at 7:52 PM, Robert Nelson <[email protected]> wrote: > On Thu, Nov 19, 2015 at 8:47 PM, William Hermans <[email protected]> > wrote: > > Hello Robert, > > > > Thanks for the reply. Essentially, I've been looking through all of that > for > > the last week or so ( off an on ). I Kind of got stuck on stuff like > this: > > > > gpios = <&gpio1 21 GPIO_ACTIVE_HIGH>; > > > > Ok, so this whole line makes complete sense to me, except the variable > that > > is being assigned. I have not been able to find any information on this > yet. > > Somewhere there was a mention to the gpio.h header file, but that file > only > > has two defines that can not possibly tell me what the variable "gpios" > > *is*. > > > > My end goal however is just to use the USR LEDs, but I want explicit > control > > of the LEDs for my app, so Linux is not "confused". At the same time, I > was > > hoping to avoid changing stock files if at all possible. > > > > Is this possible, or will I have to modify the board files no matter > what ? > > You can override them thru userspace: > > usr0: for example: > > debian@test-bbb-3:/sys/class/leds/beaglebone:green:usr0$ cat trigger > none nand-disk usb-gadget usb-host mmc0 mmc1 timer oneshot [heartbeat] > backlight gpio cpu0 default-on > debian@test-bbb-3:/sys/class/leds/beaglebone:green:usr0$ cat brightness > 0 > debian@test-bbb-3:/sys/class/leds/beaglebone:green:usr0$ cat brightness > 255 > > Change trigger to 'none' and just switch the brightness from 0 <-> 255 > for on/off > > Regards, > > -- > Robert Nelson > https://rcn-ee.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]. > 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 [email protected]. For more options, visit https://groups.google.com/d/optout.
