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Python Extension Module

Sam Chang
Prodigy 90 points

I am trying to create a Python extension module to enable control of the Nirscan Nano EVM from a Raspberry Pi 3, using the API from the source code of the DLP Nirscan Nano GUI.

I am having trouble, mainly with importing said module. When attempting to import the module, I recieve an error saying that "dlpspec_calib_write_data()" is an undefined symbol.

I was unable to figure out why this error occurs, but I wasn't sure if I was going to use the function anyway, so I commented it out.

This ended up producing an error saying that "_Z9USB_WritePv" is an undefined symbol.

I must have overlooked something, but am unable to figure out what it is.

Does anyone have an idea of what I missed? 

nirscan.cpp

  • 0
    TI__Mastermind 30600 points
    Hi Sam,

    If you could give a little time to look at the source code and what you've provided, that would be great. I'll see if I can figure out what's going on and give you some suggestions.

    Best,

    -Paul
  • 0 in reply to Paul Goedeke
    TI__Mastermind 30600 points
    Hi Sam,

    I can't seem to find where the error that you pointed out seems to originate from, which is strange.

    One thing I did notice is that you don't have an include statement for "spectrum.h". I would recommend that you look at the mainwindow.h file to make sure you're including all the right packages/headers, it looks like there are quite a few missing.

    Let me know if that helps at all.

    Best,
    Paul
  • 0 in reply to Paul Goedeke
    Prodigy 90 points

    Hi Paul

    Most of the packages I have excluded are from the Qt Framework.

    I was wondering if it is essential to install said framework, if all I want is to collect scanned data from the nirscan, without any GUI.

    Thanks

    Sam

  • 0 in reply to Sam Chang
    TI__Mastermind 30600 points
    Hi Sam,

    You should not need any of the Qt framework components, that is correct. But I noticed that a few of the Spectrum Library headers appeared to be missing, did you try to include those and see if that changes your results?

    -Paul
  • 0 in reply to Paul Goedeke
    Prodigy 90 points

    I have added the following header files to the .cpp:
    #include "spectrum.h"
    #include "dlpspec_scan.h"
    #include "regressiontest.h"
    #include "lmdfu.h"
    #include "Common.h"
    #include "verticallabel.h"
    #include "math.h"
    #include "dlpspec_calib.h"
    #include "dlpspec_util.h"
    #include "dlpspec_version.h"
    #include "dlpspec_helper.h"
    #include "dlpspec_setup.h"
    #include <fstream>
    #include <iostream>
    #include "lmusbdll.h"
    #include "firmware.h"
    #include "NNOSNRDefs.h"
    #include "usb.h"
    #include "API.h"
    #include "filepath.h"
    #include "scanconfiglist.h"
    #include "evm.h"

    As I have not included any of the Qt components, things like QDir, and QString, are left undefined. But because they are used in many of the header files, I am uncertain if they should be removed, or replaced, such as plot.h and filepath.h (included by spectrum.h).

  • 0 in reply to Sam Chang
    TI__Mastermind 30600 points
    And I assume that even with these added headers that the program still doesn't work?
    -Paul
  • 0 in reply to Paul Goedeke
    Prodigy 90 points

    No, it does not.

    I will continue to troubleshoot the problem, and will update if I have additional questions.

    Also, I am currently compiling the code with a Python script. I was wondering if the choice of compiler might contribute to the problem I am having?

    I understand that the GUI was compiled on Qt, but can the API be compiled into a program separately?

    Is there a recommended compiler?

    Thanks

    Sam

  • 0 in reply to Sam Chang
    TI__Mastermind 30600 points
    Hi Sam,

    You should be able to build the API separately. You'll need to include the Spectrum Library source, Serial.c, API.cpp and USB.cpp

    Here is the code from a batch file:
    cd /D %~dp0
    C:\Qt\Tools\mingw530_32\bin\gcc -c -Wall -DNO_TIMER_SUPPORT -I"..\..\Common\include" -I"hidapi-master/hidapi" -I"..\..\..\DLP_Spectrum_Library\src" Serial.c API.cpp usb.cpp
    C:\Qt\Tools\mingw530_32\bin\gcc -shared -o nano_api.dll Serial.o API.o usb.o -Lhidapi-master/windows/debug/ -lhidapi -L..\..\..\DLP_Spectrum_Library\src -llibdlpspec
    del *.o

    The compiler that I would recommend using is gcc.

    -Paul
  • 0
    Prodigy 20 points

    Hi Sam,

    Would you mind sharing your python script when it’s working? I also have a nano that I’d love to use with a RPI3.

    Thank you, Sir.

    Dominick

    medic418@gmail.com