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DeviceWrite Error using remote development kit on RPi with Raspbian Jessie

Hans Schmidt
Posted 9 years ago

I know there are older posts on the RDK (eg http://community.wolfram.com/groups/-/m/t/163395) but I have decided to start a new one because they are old.

I have had full functionality with RDK and running a remote kernel on an RPi in the past, however have problems with it on an RPi 2 running Raspbian Jessie. I'm using Mathematica v10.3.0.0 on OSX.

I get an error when evaluating DeviceWrite on the RPi remote kernel. Other expressions evaluate without any problems eg $MachineID[]; 1+1 etc.

Has anyone seen this error before? Note: the output "18->1" does not actually turn GPIO 18 on.

DeviceWrite Error

DeviceWrite["GPIO", 18->1] runs successfully using sudo wolfram in the command line via SSH. Success via SSH RPi and LED

TL/DR Has anyone else had success/trouble with the RDK, DeviceWrite and Raspbian Jessie?
POSTED BY: Hans Schmidt
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Hans Schmidt
Hans Schmidt
Posted 9 years ago

Update:

I’ve managed to get BinaryWrite to work (from Arnoud’s instructions http://community.wolfram.com/groups/-/m/t/157473) via some buttons like this:

stream = OpenWrite["/sys/class/gpio/gpio18/value", BinaryFormat -> True]

Button["flash LED", task = RunScheduledTask[{BinaryWrite[stream, 48], Pause[0.5], BinaryWrite[stream, 49]}, .5]]

Button["stop Flashing", {RemoveScheduledTask[task], BinaryWrite[stream, 48]}]

But, I have also noticed that "/sys/class/gpio/gpio18/value” doesn’t seem to exist until I run DeviceWrite[“GPIO”, 18->1] on the command line either.

to be cont'd....
POSTED BY: Hans Schmidt
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