Hey Charles, Thanks for the prompt response.
After sudo bash I get: root@raspberrypi:/home/pi# echo gpio17 > /sys/class/gpio/export bash: echo: write error: Invalid argument The previous commands I tried were sudo'ing everything and also 'sudo -i'. OAN: Dumb question #256 I'm presuming 'gpio17' is to allow access to pin 17 and not what was my first impression that gpio17 allows access to all 18 pins? Best wishes, Julian On 2 April 2013 10:35, Charles Goyard <[email protected]> wrote: > Hi Julian, > > The commands I gave and to be run as root. > so: > > sudo bash > echo gpio17 > /sys/class/gpio/export > echo out > /sys/class/gpio/gpio17/direction > chown charles /sys/class/gpio/gpio17/value > exit > pd & > > Can you post the full command set you tried ? > > It seems there's an overall consensus on running pd (and all kinds of > other stuff) as root on the pi. I don't agree with this but that's life > and I don't use the pi much anyway. > > Cheers, > > -- > Charles > > Julian Brooks wrote: > > Hi Charles / list, > > > > Can I ask you/anyone a question re: permissions for accessing the gpio > pins > > please? > > > > Currently I can't get past: > > "echo gpio17 > /sys/class/gpio/export" > > which gives me "permission denied" with everything I've tried. > > > > Are you using WiringPi to allow access to the gpio and if not how? > > > > I'd like to stick with Miller's [gpio] object > > http://crca.ucsd.edu/~msp/syllabi/206.13w/index.htm > > (found in the earlier split thread - apologies for the noise) > > and keep as much within Pd as possible. > > > > Best wishes, > > > > Julian > > > > > > On 28 January 2013 14:14, Charles Goyard <[email protected]> wrote: > > > > > Hi list, > > > > > > I could make use of gpio (as output) within pd with just [textfile] : > > > > > > on the command-line: > > > > > > echo gpio17 > /sys/class/gpio/export > > > echo out > /sys/class/gpio/gpio17/direction > > > chown charles /sys/class/gpio/gpio17/value > > > > > > inside pd: > > > > > > [ set 1 ( [ write /sys/class/gpio/gpio17/value cr ( > > > | > > > [ textfile ] > > > > > > works. > > > > > > > > > I use it to drive a light system from a track of a audio file > containing > > > only square waves at a given frequency (say, cues embedded inside an > > > audio file). > > > > > > I basically snapshot~ and see if it's over or below 0, and turn the > gpio > > > on/off on change. > > > > > > I started using pd on the pi three hours ago and have it playing audio > and > > > banging the gpio in no time. > > > > > > Thanks to all for this wonderful community. > > > > > > I'm very happy ;). > > > > > > > > > -- > > > Charles > > > > > > _______________________________________________ > > > [email protected] mailing list > > > UNSUBSCRIBE and account-management -> > > > http://lists.puredata.info/listinfo/pd-list > > > > > _______________________________________________ > [email protected] mailing list > UNSUBSCRIBE and account-management -> > http://lists.puredata.info/listinfo/pd-list >
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