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 cg@fsck.fr 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 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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