[PD] how to install and use GPIO external

[J Oliver]

On Jun 19, 2013, at 7:07 PM, Josh Downing wrote:
> click "enable 1", "open 1", and then "output 0".
ok.
> No error messages but where should I expect to see the high/low state of GPIO 17?
it should come out of the object into a number box or toggle as far as I can remember...
put a number box in the outlet of the gpio object.

J

> 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 at 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 at 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 at iem.at> wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
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> 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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> iEYEARECAAYFAlHBlqMACgkQkX2Xpv6ydvSjtACg7y5vI4qGYDwjphUooM/Yt+RZ
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> 
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> 
> -- 
> **********************
> Jaime E Oliver LR
> www.jaimeoliver.pe
> 
> 

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