Re: [PD] gpio on the raspberry pi from within pd ?

-- 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 cg@fsck.fr 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 > > > > _______________________________________________ > > Pd-list@iem.at mailing list > > UNSUBSCRIBE and account-management -> > > http://lists.puredata.info/listinfo/pd-list > >