Is libusb installed ?

phloks · July 11, 2016 at 12:40 PM

Hi,

Managed to install python modules (pywws), but when I try to read from an USB attached device, I get the error :

Quote

usb.core.NoBackendError: No backend available

People say this is due to the fact that package libusb is not installed.
Can anyone of the developers tell me if this is the case, please ?
I compiled the LE I'm using myself, but if I have to include libusb when compiling, I can't find a guide how to do that.....

Thanks,
Hans

Grimson · July 11, 2016 at 1:48 PM

I'm not a developer, but anyone can look at the git code:
LibreELEC.tv/package.mk at master · LibreELEC/LibreELEC.tv · GitHub
so libusb is included in the build.

**escalade** · July 11, 2016 at 2:51 PM

It's already included:

Code

# ls /usr/lib/libusb*
/usr/lib/libusb-0.1.so.4      /usr/lib/libusb-0.1.so.4.4.4  /usr/lib/libusb-1.0.so        /usr/lib/libusb-1.0.so.0      /usr/lib/libusb-1.0.so.0.1.0  /usr/lib/libusb.so

phloks · July 11, 2016 at 4:16 PM

Thanks for answering my question.
Should have seen that myself.....( slowly disappearing around the corner....)

However, the python script I'm using is apparently unable to find this lib location, because
the no backend error is still there.

**lrusak** · July 11, 2016 at 6:21 PM Official Post

not really sure, but if you wanted to make a custom build I have package.mk's available for pyusb and other relevant packages

python

phloks · July 12, 2016 at 3:25 PM

Quote from lrusak

not really sure, but if you wanted to make a custom build I have package.mk's available for pyusb and other relevant packages

python

Great !
I'll give it a try.

Thanks.

phloks · July 12, 2016 at 11:34 PM

Hi lrusak,

Downloaded the OpenELEC.tv-WeeWXOS branch, and started compiling.
It gets a long way, but when trying to compile libirman it stops with the error:

UNPACK libirman
gzip: stdin: not in gzip format

and the compilations errors out.

Any idea how to fix this, or how to determine where this goes wrong ?

Thanks,
Hans

**lrusak** · July 12, 2016 at 11:46 PM Official Post

Quote from phloks

Hi lrusak,

Downloaded the OpenELEC.tv-WeeWXOS branch, and started compiling.
It gets a long way, but when trying to compile libirman it stops with the error:

I didn't mean to use that branch, because that branch won't work.

I mean you can copy the folder or just the package.mk of the package you need.

phloks · July 14, 2016 at 11:00 AM

Quote from lrusak

I didn't mean to use that branch, because that branch won't work.

I mean you can copy the folder or just the package.mk of the package you need.

Ok,
I probably do not understand how this works.
I git cloned the current OE master branch, and created two extra directories under packages/python/system called pyserial and pyusb.
And of course, I copied the package.mk files in their respctive directories.
After that I compiled everything (had to change the URL for libssh-0.7.3 to another site because until now only 0.7.2 is available), and I got an nimage.

It seems however that pyusb and pyserial have not been included in the build.

Is there something else I need to do first ?

Thanks,
Hans

**escalade** · July 14, 2016 at 11:10 AM

You'll need to modify scripts/image to install it, or add it to another package's dependencies.

phloks · July 14, 2016 at 11:55 AM

Quote from escalade

You'll need to modify scripts/image to install it, or add it to another package's dependencies.

Ok,
Thanks for answering my question.
I'm looking at scripts/image right now, but I don't see where to add in references to pyserial and pyusb.

Is there documentation on how to do this ?

Thanks,
Hans