BTW - Forgot to add: I did read through this thread (as mentioned by Charles): http://www.raspberrypi.org/phpBB3/viewtopic.php?f=29&t=9667&p=198848 And left none the wiser... Seemed to me that there are several possible implementations, though I am completely unsure as to which one would work with the /sys/class/gpio/ method that [gpio] makes use of?
I think I'm going to be asking several possibly dumb questions around gpio until I can get my head around all this so apologies up-front.
Julian
J
On 2 April 2013 09:46, Julian Brooks jbeezez@gmail.com 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
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