[PD] disis_spi problem on raspberry pi

Jack jack at rybn.org
Tue Sep 2 22:14:11 CEST 2014

Hash: SHA1


> On 09/02/2014 01:39 PM, Jack wrote: Hello,
> I am trying to use [disis_spi] on my raspberry pi (Linux
> raspberrypi 3.6.11+ #538 PREEMPT Fri Aug 30 20:42:08 BST 2013
> armv6l GNU/Linux ) with Pd 0.45.2. When I open the help patch
> 'disis_spi-help.pd' and click on [open /dev/spidev0.0(, in Pd
> console i get : could not open SPI device.
> I used to use a C++ program until now with which I used to open 
> "/dev/spidev0.0" and all was OK.
> What can I do to solve this problem ?
>> Hi,
>> I haven't tried the external with pd-vanilla, although there is
>> no reason I can think of that it would not work with vanilla. Did
>> you make sure to load the necessary drivers (I assume you did
>> since you mentioned you used to access it before via a different
>> application, but if you loaded them manually and have rebooted
>> RPi since, they would not be necessarily loaded this time
>> around). Just to be sure try:
>> lsmod | grep spi
>> ...and see if it lists spi-bcm2708, if not, do:

I get :
spidev 5248 0
spi_bcm2708 4841 0

>> sudo modprobe spi-bcm2708 sudo modprobe i2c-bcm2708
>> If that works, you may want to add those at the bottom of your 
>> /etc/modules config file (one module per line, like so):
>> spi-bcm2708 i2c-bcm2708

So I guess I needn't to add these lines ?

>> This will ensure they get loaded every time you start the RPi.
>> BTW, which gen RPi do you have?

Model B.

What I do to have disis_spi.pd_linux is :
$ cd pd-l2ork_rpi
$ ./makeall.sh

But I get several errors :

fatal: destination path 'wiringPi' already exists and is not an empty
Already up-to-date.
make: Nothing to be done for `static'.
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 -o disis_gpio.o -c
disis_gpio.c:18:22: fatal error: g_canvas.h: No such file or directory
compilation terminated.
make: *** [disis_gpio.l_arm] Error 1
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 -o disis_spi.o -c disis_spi.c
ld  -shared -o disis_spi.l_arm disis_spi.o -lc -lm
strip --strip-unneeded disis_spi.l_arm
rm disis_spi.o
mv disis_spi.l_arm disis_spi.pd_linux

And after :
$ pd disis_spi/disis_spi-help.pd
If i click on [open /dev/spidev0.0( I get :
could not open SPI device

Something else i can do ?
Thanx for you help.


>> HTH
>> Ico
> ++
> Jack
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> -- Ivica Ico Bukvic, D.M.A. Associate Professor Computer Music ICAT
> Senior Fellow DISIS, L2Ork Virginia Tech School of Performing Arts
> - 0141 Blacksburg, VA 24061 (540) 231-6139 ico at vt.edu 
> www.performingarts.vt.edu disis.music.vt.edu l2ork.music.vt.edu
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