P9_25 is GPIO3_21, which is also muxed with MCASP0 clock pin (MCASP0_ACLKX). The 24.576MHz external oscillator (Y4) needs to be disable by software for proper functioning the pin P9_25 as GPIO.
Regards, Subhendu On Fri, Aug 8, 2014 at 12:41 AM, <[email protected]> wrote: > Hello, > > I try to turn a led manually on and off. > The led is connected in P9_25 that is gpio117. > So I execute the following lines in beaglebone's terminal: > > cd /sys/class/gpio > echo 117 > export > cd gpio117 > echo out > direction > echo 1 > value > > But the led is always on. > > I measured the voltage with a digital mutimeter and it was 1.66V for both > values 1 and 0. > > Do you have any idea on what could be the problem? > > > -- > 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.
