Hi Jecel,

Thanks for the reply. I have a Squeak/Seaside program that controls the GPIO pins. Pre raspbian stretch Squeak was present and I would install NuScratch to get some GPIO interface code. Now I install Squeak myself but I'm missing some GPIO stuff. I'm not sure what I have to load/install to get it. I didn't realize what scratch2 was but hoped it was the NuScratch stuff by a different name.

If Tim Rowledge is reading this, are you going to keep supporting your Squeak/Scratch code and if so do you know what I need to get the GPIO stuff working?

Lou

On Fri, 20 Oct 2017 18:00:15 -0300, "Jecel Assumpcao Jr." jecel@merlintec.com wrote:

Louis LaBrunda wrote:

...

I tried: sudo apt-get install scratch2 that seems to find what it is looking for but I'm not sure it is what I should install and my code fails calling: GPIOAccessorPiGpio uniqueInstance with an externalCallFailed in PigpiodInterface.

Am I installing the right thing? Is something missing? With jessie, pigpio and NuScratch, everything worked.

Scratch 2 is a different program written in Flash. And Scratch 3 will be yet another program written in Javascript. But each version is supposed to be able to load projects created by earlier versions, so these changes shouldn't be too obvious to users. Unfortunately if you use extensions then the difference will be very visible to you.

Note that the Raspberry Pi foundation has decided to move to Scratch 3, so I would expect future versions of Raspbian to not include the Squeak based Scratch.

-- Jecel

On 20-10-2017, at 3:08 PM, tim Rowledge tim@rowledge.org wrote:

...

now fails in 2017-09-07-raspbian-stretch-lite with: Unable to locate package NuScratch.

lowercase, I think

yup, all lowercase. It’s available at http://archive.raspberrypi.org/debian/pool/main/n/nuscratch/nuscratch_201701... if you really have trouble.

I suspect it will stay in Raspbian for a while yet. Not everyone likes Scratch2.

tim -- tim Rowledge; tim@rowledge.org; http://www.rowledge.org/tim Useful random insult:- Not much to show for four billion years of evolution.

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On 21-10-2017, at 11:06 AM, Louis LaBrunda Lou@Keystone-Software.com wrote:

Hi Tim,

I installed the file from the link you gave me but still no luck. I see the SqueakDebug log attachment doesn't look very good so below are parts of it. I still think I'm missing something, drivers, an interface, something?

My best guess is that you don’t have pigpio installed, which would make some sense for Raspbian lite. If you open a terminal and try `pigpiod` you should get something like 2017-10-21 11:39:00 initCheckPermitted: +---------------------------------------------------------+ |Sorry, you don't have permission to run this program. | |Try running as root, e.g. precede the command with sudo. | +---------------------------------------------------------+

Can't initialise pigpio library

back if it is installed. And if not, I guess you’d get some ‘command not found’ error. I’ve not needed to try it (my first installs were from source because it wasn’t in by default and then after that it was there by default) but I imagine installing pigpio would be `sudo apt-get install pigpio`

tim -- tim Rowledge; tim@rowledge.org; http://www.rowledge.org/tim Cloister: a pretentious clam

On 23-10-2017, at 8:26 AM, Louis LaBrunda Lou@Keystone-Software.com wrote:

I tried:

sudo pigpiod

just to see what would happen. The response was:

2017-10-23 10:58:46 initInitialise: Can't lock /var/run/pigpio.pid Can't initialise pigpio library

Does that tell us anything?

That seems to me to confirm that pigpio was installed and that something else is stopping it… which is pretty much where my ‘expertise’ in linux runs out.

A bit of digging on the Pi forums (which you really ought to belong to and read with your morning coffee every day)) suggests that one has to have done `sudo systemctl enable pigpiod ` but I was under the impression that that is for starting the daemon as a service automatically. I see several places where people talk about installing pigpio on lite and they all seemed to just use the `sudo apt-get install pigpio` thing.

It would be worth signing up to the Pi forums (https://www.raspberrypi.org/forums/) and looking through stuff there, maybe even asking in the Raspbian forum if you can’t spot anything.

The key site for pigpio is http://abyz.co.uk/rpi/pigpio/pigpiod.html and joan is generally very helpful if you email. It might be worth redoing the install from source, which is explained on her site.

tim -- tim Rowledge; tim@rowledge.org; http://www.rowledge.org/tim Science is imagination equipped with grappling hooks.

Hi Everyone,

To wrap this thread up I have solved all the problems with running Squeak using GPIO ports on raspbian-stretch-lite. To get the latest Squeak Scratch:

sudo apt-get install nuscratch

To get Squeak to use/find the GPIO stuff I added symbolic links to the folder where the Squeak VM lives that point to two .so files:

/usr/lib/libpigpio.so /usr/lib/libpigpiod_if2.so

Many thanks to Tim and Dave for their help.

Lou

Hi Tim,

That’s just weird. On my Pi’s I have 84 -rw-r--r-- 1 root root 83400 Jan 12 2017 /usr/lib/libpigpiod_if2.so 72 -rw-r--r-- 1 root root 71280 Jan 12 2017 /usr/lib/libpigpiod_if.so 260 -rw-r--r-- 1 root root 264712 Jan 12 2017 /usr/lib/libpigpio.so and no links involving them at all. It must be something to do with one other of the zoo of path variables that unix likes to maintain and hide from us. In the ‘squeak’ shell script to start up the vm I see LD_LIBRARY_PATH being set and it looks like /usr/lib is included there. I think. Maybe. tim

I came across LD_LIBRARY_PATH somewhere but I can't remember if I tried to set it. I did try to set regular PATH. The squeak.sh file I have doesn't have any reference to LD_LIBRARY_PATH. Maybe you added it? I was also under the impression that /usr/lib was LD_LIBRARY_PATH or whatever path is used for .so files?

I just tried:

export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/lib

in my shell script instead of the links, it doesn't work. Do I have something wrong? What do you have?

I just tried:

export LD_LIBRARY_PATH="$LD_LIBRARY_PATH:/usr/lib"

and it works! Not coming up with this sooner is on me. But in my defense searches came up with lots of conflicting information, quotes, no quotes, which path variable, /usr/lib supposedly being the default. I also hate scripting languages made on top of command languages after the fact. They are never intuitive. Rant over.

In a squeak script in /usr/bin/squeak (not .sh) on what I think is Raspbian Jessie, I found this at the end:

# prepending is less flexible but safer because it ensures we find the plugins # in the same directory as the VM. We must include at least /lib and /usr/lib # if libraries there-in are to be found. These directories are not implicit. case $PLATFORMLIBDIR in /lib|/usr/lib) SVMLLP=/lib:/usr/lib;; *) SVMLLP="$PLATFORMLIBDIR:/lib:/usr$PLATFORMLIBDIR:/usr/lib" esac LD_LIBRARY_PATH="$PLUGINS:$SVMLLP:${LD_LIBRARY_PATH}" $GDB "$BIN/squeak" $COMPIN "$@"

I guess it adds /usr/lib to the path but the version of squeak.sh that comes with the ARM squeak has nothing like it.

I am going to drop the links and set LD_LIBRARY_PATH, now that I know how and that it works. I guess that with Squeak disappearing between Jessie and Stretch and the squeak.sh script that comes with ARM not setting LD_LIBRARY_PATH and /usr/lib not being defaulted in LD_LIBRARY_PATH like lots of posts claim, we have what we have.

Thanks again for the help. Just being able and forced to explain things to someone, helps me think of new things to try.

Lou

Hi,

I'm back to using the links. I would prefer to add /usr/lib (where the .so files are) to what ever path is appropriate but can't seem to figure out what path to set or how to set it. I tried LD_LIBRARY_PATH and some other paths but nothing works. For now the links work. If things change and using a path works, I will switch to that.

Lou

Hi Tim,

I think this is just a Raspbian Stretch problem. I have seen some posts about problems with Stretch and LD_LIBRARY_PATH and searching but no real answers. I keep wasting time trying things that get me nowhere.

Lou

On Mon, 30 Oct 2017 10:46:34 -0700, tim Rowledge tim@rowledge.org wrote:

This is very puzzling.

You should have /usr/bin/squeak and /usr/bin/scratch

scratch does some specific to scratch flim-flammery and call /usr/bin/squeak, which does a load of weird stuff to find the libc path, makes a cup of tea, sits and has that with a biscuit, thinks about it some more. Eventually it sets LD_LIBRARY_PATH and runs the actual vm executable with the assorted options.

tim