For whatever reason on my install (and this is based upon the one Miller shared at the CrashSpace RPi session in February 2013)
sudo bash
echo gpio17 > /sys/class/gpio/export

wont work.

But
sudo echo "17" > /sys/class/gpio/export
Does

Will test some more with the [gpio] object later - out of time now:(

Cheers Charles,

Julian

On 2 April 2013 12:22, Charles Goyard <cg@fsck.fr> wrote:

Hi,

Julian Brooks wrote:
> After sudo bash I get:
> root@raspberrypi:/home/pi# echo gpio17 > /sys/class/gpio/export
> bash: echo: write error: Invalid argument

That's strange. I don't have a pi handy for now to double check my
instructions. Maybe I forgot something.

> 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?

yes, only creates the gpio17 "file" for pin 17.

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