[Etherlab-users] Problem with running Etherlab and Ethercat Master

[Henrik Barie]

Am 2022-09-11 19:18, schrieb Henrik Barie:
> Dear Etherlab-Users and -Developers,
> 
> I tried installing and running Etherlab + Ethercat Master on
> my Labtop using the latest Ubuntu version 22.04.1 LTS (Jammy
> Jellyfish, because it offers a Realtime-Kernel Beta which is easy to
> install. Before that, I tried it with Realtime-Kernel patches on
> OpenSUSE, Ubuntu 18.04 and 20.04 but I couldnt get the
> Realtime-Kernels to work, so I decided to use this Realtime-Kernel
> Beta for 22.04 LTS.
> 
> I installed Etherlab + Ethercat Master using this Guide:
> 
> https://github.com/SchapplM/etherlab-examples/blob/master/SETUP_ETHERCAT.MD
> 
> I set up Matlab 2014b using this guide:
> 
> https://symbitron.eu/wiki/index.php?title=EtherLab_Installation#Installing_the_IgH_EtherCAT_master_1.5.2
> 
> In this guide it said: this version of etherlab contains a c-file
> (ec_slave3.c) that is not compatible with the newer MATALAB versions
> That is why I used 2014b and not a newer Version. The "setup_etherlab"
> command worked fine and I had no errors which I had with newer
> Matlab-Versions.
> 
> The Problem is that after installing, I couldnt start Ethercat:
> 
> When I first typed in "sudo /etc/init.d/ethercat start", it said
> the ec_master module wasnt found. When I used the "depmod"-command
> afer this and tried to start again, it said:
> 
> Starting EtherCAT master 1.6.0-rc1 modprobe: ERROR: could not insert
> 'ec_master': Invalid argument
>  failed
> 
> After this I used "sudo dmesg" and saw these Messages:
> 
> [   87.523095] ec_master: loading out-of-tree module taints kernel.
> [   87.523232] ec_master: module verification failed: signature and/or
> required key missing - tainting kernel
> [   87.524968] EtherCAT: Master driver 1.6.0-rc1 unknown
> [   87.525000] EtherCAT ERROR: MAC address may not be empty.
> 
> ......
> 
>  6007.467568] EtherCAT: Master driver 1.6.0-rc1 unknown
> [ 6007.467607] EtherCAT ERROR: MAC address may not be empty.
> 
> ......
> 
> [29706.025402] EtherCAT: Master driver 1.6.0-rc1 unknown
> [29706.025429] EtherCAT ERROR: MAC address may not be empty.
> 
> 
> (3 times this message)
> 
> and for these errors I couldnt find a solution so I wanted to ask you
> if you could maybe help me with this.
> 
> I have written my Ethernet MAC-Adress as MASTER0_DEVICE as well as the
> "generic" Driver as DEVICE_MODULES in the sysconfig-File, which is
> also the only one that is enabled.
> 
> 
> My Kernel is 5.15.0-1020-realtime
> 
> #########################################################################
> 
> A second Error which occurred is Matlab-related, but maybe you know
> the solution to this:
> 
> When typing:
>>> etherlab_lib
> 
> I get the following messages and nothing happens afterwards:
> 
> MATLAB:dispatcher:loadLibrary Can't reload
> '/usr/local/MATLAB/R2014b/bin/glnxa64/libmwsl_graphical_classes.so'.
> Caught MathWorks::System::FatalException
> 
> This also happens when trying to start Simulink
> 
> 
> I really hope you can help me with these problems,
> because I am unable to continue my Project without this software.
> 
> 
> 
> Greetings
> Henrik


Hello,

I tried the solutions you offered and they worked.

I added the MAC-Address as Master0-Device and "generic" as 
Device-Moudules
to the etherlab.conf file, typed in modprobe ec_master and afterwards 
main_devices=<MAC-Address>.

It worked and the problem with the start-command was at the init script 
like you suspected, which sourced
/usr/local/share/etherlab/etc/sysconfig/ethercat

afer adding the MAC-Adresss and "generic" in this ethercat-file too,
it worked fine with the start command.


Thank you very much for your help!


I also could solve the Matlab-issue and now everything seems to work as 
it should.

Greetings
Henrik