[PD] how to install and use GPIO external

Josh Downing jndowning at gmail.com
Wed Jun 19 18:02:48 CEST 2013

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!


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

> 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
> Version: GnuPG v1.4.12 (GNU/Linux)
> Comment: Using GnuPG with Icedove - http://www.enigmail.net/
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> =0t/E
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