Thanks Jaime, that fixed my error problems. No errors now but I can't seem to figure out how to set the patch up to configure GPIO 17 as an input and then to read the state. I modified gpio-help.pd to do this by changing "output 1" to "output 0" (according to the patch output 0 should configure the pin as an input). I then click "enable 1", "open 1", and then "output 0". No error messages but where should I expect to see the high/low state of GPIO 17? Should this be reflected in the bang object in the script (white for low and black for high)? I have the poll input check box checked. When I toggle the voltage on GPIO 17 from 3.3V to GND I do not see anything change in the script. I am able to see the high/low state of the pin 17 change by using the "readall" command from LXTerminal so I know that I'm switching the voltage correctly on the right pin, just not seeing how I get this status in pure data using the gpio-help.pd script. Any thought on how I do this?

Sorry I have very little experience with pure data and am just learning.

Thanks,
Josh

On Wed, Jun 19, 2013 at 11:17 AM, Jaime Oliver <jaime.oliver2@gmail.com> wrote:

you need to be root.

start pd with sudo. unless there is a more permanent solution by now?

best,

J

On Wed, Jun 19, 2013 at 6:02 PM, Josh Downing <jndowning@gmail.com> wrote:

Thanks for the help guys! So I deleted the "-m32" from the makefile and then everything seemed to build okay. I then added the correct path for the extension in pure data and loaded the "gpio-help.pd" patch without getting an error message. In the gpio-help.pd patch I would click "enable 1" and then click "open 1" and after clicking "open 1" I would get an error message: "/sys/class/gpio/gpio17/value: No such file or directory".

I then realized that I probably needed to install wiringPi. I downloaded this and installed it. However I would still get the previous error message within PD. I then decided to manually try to create the file using commands in LXTerminal. I did this using this command, "echo "17" |sudo tee /sys/class/gpio/export". I then noticed that the gpio17 folder and accompanying files were created. I was also able to correctly read the state of the pin using "gpio readall" command from LXTerminal.

I then loaded the "gpio-help.pd" file again in PD. Now once I click "open 1" instead of the no such file or directory error I get "/sys/class/gpio/gpio17/value: Permision denied" error. Is there someway I can use this GPIO library within the PD visual interface without getting permission denied errors? Also, shouldn't clicking "enable 1" within the gpio-help.pd patch create the "/sys/class/gpio/gpio17" folder and accompanying files? How can I get this to work within PD without having to run the commands from LXTerminal to create the folder/files? Do I need to somehow indicate to pure data the path of wirngPi?

Almost there! Really appreciate your guys patience with me and help on this!

Josh

On Wed, Jun 19, 2013 at 6:31 AM, IOhannes m zmoelnig <zmoelnig@iem.at> wrote:

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

On 2013-06-18 23:37, Josh Downing wrote:
>
>
> cc -DPD -O2 -funroll-loops -fomit-frame-pointer
> -fno-strict-aliasing -Wall -W -Wshadow -Wstrict-prototypes
> -Wno-unused -Wno-parentheses -Wno-switch -I../pd/src
> -I../../pd/src -I../../../pd/src -I../../../../pd/src
> -I../../../../../pd/src -m32 -o gpio.o -c gpio.c cc1: error:

> unrecognized command line option ?-m32? make: *** [gpio.l_i386]

> Error 1
>
> Do you know what this error message could mean?

it means that the makefile has a compiler flag "-m32" which is not
known to the compiler.

> What should I expect as the output from compiling like this?

nothing. the build failed.

you could try editing your makefile and removing the "-m32"
occurences, and see what you get then.

make a backup of the makefile, before you go ahead.

fgamsrd

IOhannes
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Version: GnuPG v1.4.12 (GNU/Linux)
Comment: Using GnuPG with Icedove - http://www.enigmail.net/

iEYEARECAAYFAlHBlqMACgkQkX2Xpv6ydvSjtACg7y5vI4qGYDwjphUooM/Yt+RZ
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