Errors on drivers installation on Raspberry Pi

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csr
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Posts: 0
Joined: Tue Aug 06, 2019 8:29 am

Errors on drivers installation on Raspberry Pi

Post by csr » Tue Aug 06, 2019 9:22 am

Hi,

I'm new using Pico technologies and I hope you could help me.
I want to collect data from a USBTC08 within Nodered on a Raspberry Pi 3 B+ with Raspbian Stretch.

For the moment I'm just trying to make it working by executing python scripts but I keep getting errors and I am now stuck with this one.

I installed the drivers following this guide : https://www.picotech.com/downloads/linux
Then I downloaded the github repo and followed this guide : https://github.com/picotech/picosdk-python-wrappers

One part is installed under /opt/picoscope : /include /lib and /share folders
another part under usr/local/lib/python2.7/picosdk (same for python 3.5)

When I execute the USBTC08 example I get this error :

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Traceback (most recent call last):
  File "/home/pi/test_picolog_2.py", line 9, in 
    from picosdk.usbtc08 import usbtc08 as tc08
  File "/usr/local/lib/python3.5/dist-packages/picosdk/usbtc08.py", line 19, in 
    usbtc08 = usbtc08lib()
  File "/usr/local/lib/python3.5/dist-packages/picosdk/usbtc08.py", line 16, in __init__
    super(usbtc08lib, self).__init__("usbtc08")
  File "/usr/local/lib/python3.5/dist-packages/picosdk/library.py", line 49, in __init__
    self._clib = self._load()
  File "/usr/local/lib/python3.5/dist-packages/picosdk/library.py", line 71, in _load
    env_var_name = "PATH" if sys.platform == 'win32' else "LD_LIBRARY_PATH"
picosdk.errors.CannotFindPicoSDKError: PicoSDK (usbtc08) not found, check LD_LIBRARY_PATH
I first read that it could be due to restricted access to I gave full access to /opt/picoscope/lib/* and to /usr/local/lib/python2.7/dist-packages/picosdk/* with

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sudo chmod 777 myfolder
But I still have the error.

Then I found it could be due to the library path used by find_library method which I found is the PATH or LD_LIBRARY_PATH environment variables. So I added :/opt/picoscope to this PATH which is now

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PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/local/games:/usr/games:/opt/picoscope
LD_LIBRARY_PATH=/opt/picoscope
But I still have the error.

Do you know how I can fix this ?

Thank you,
Charlotte

csr
Newbie
Posts: 0
Joined: Tue Aug 06, 2019 8:29 am

Re: Errors on drivers installation on Raspberry Pi

Post by csr » Wed Aug 07, 2019 12:04 pm

I finally found a solution which might not be the best but I can continue to work on this : I moved the library files (.so) to picosdk folder and renamed the files from libusbtc08.so to usbtc08.so and the example is now working !

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