64-bit

[SirNerdBear]

I was able to compile the C version on my Pi running 64-bit OS. But the dynamic library used by Python is precompiled and 32-bit. Is there a makefile for building librm0004_display.so?

[rownie66]

Hello @SirNerdBear ,

I think I have the same issue, also running a 64-bit raspberry pi OS. When I try to load this library I get the following error:

Traceback (most recent call last):
  File "/home/XXX/./mydisplay2.py", line 16, in <module>
    UCTRONICS = cdll.LoadLibrary('/opt/SKU_RM0004/python/librm0004_display.so')  #The directory where the dynamic link library is located
  File "/usr/lib/python3.9/ctypes/__init__.py", line 452, in LoadLibrary
    return self._dlltype(name)
  File "/usr/lib/python3.9/ctypes/__init__.py", line 374, in __init__
    self._handle = _dlopen(self._name, mode)
OSError: /opt/SKU_RM0004/python/librm0004_display.so: wrong ELF class: ELFCLASS32

Do you found a solution in the meantime and would like to help me?

[rownie66]

I found a solution:

1. Install CMake on your 64-Bit Raspberry Pi

   apt install cmake

2. Create a folder build in the repository root folder (SKU_RM0004) and navigate to it

   git clone https://github.com/UCTRONICS/SKU_RM0004.git
   cd SKU_RM0004
   mkdir build
   cd build

3. Generate build files with cmake (you need to be in the build folder)

   cmake ..

4. Build the library using the previously generated Makefile in the build/ folder

   make

[srussell1979]

So kinda related, I can not keep the display working after a reboot. I have followed the instructions to the letter, and have not been able to get the screen to work after a restart. I am VERY new at this so I might be doing something wrong. I have 64bit pi lite running on my pi4

[wolflu05]

I'm not sure if this is related, this issue is about the python bindings with the dynamic linked library as far as I see which is only available for 32bit in the repo. @rownie66 described how to compile the dynamic linked library for 64 bit. #3 might help you.