Skip to content

Latest commit

 

History

History
76 lines (47 loc) · 3.83 KB

Dev4Windows.md

File metadata and controls

76 lines (47 loc) · 3.83 KB
Raw

What to Install on a Fresh System

  1. Java 11 SDK
  2. IntelliJ
  3. Mingw-w64
  4. Waveforms

Install DWF Framework on Windows 10

Download Waveforms from Digilent and launch it to run the installation wizard. This process will install the required frameworks.

First Sanity Check - Waveforms

After downloading and installing Waveforms, open it up and make sure it connects to the AD2 device and operates as expected.

Second Sanity Check - Compile and Run SDK Example

Unzip Mingw64 and move 'mingw64' to 'C:' and add 'C:\mingw64\bin' to your PATH environment variable via the Windows Settings GUI. Open up the terminal with 'CMD'.

Change permissions on cd C:\Program Files\Digilent\WaveFormsSDK\samples\c via the GUI so that the gcc command can write the *.out file in that folder. Open up the terminal with 'cmd'.

cd C:\Program Files (x86)\Digilent\WaveFormsSDK\samples\c
// gcc digitalout_pins.cpp -o digitalout_pins.out -L"C:\Windows\System32" -ldwf
gcc digitalout_pins.cpp -o digitalout_pins.out -L"C:\Program Files (x86)\Digilent\WaveFormsSDK\lib\x64" -ldwf
digitalout_pins.out

Compile Java Code and Generate Header File

Move to project directory

cd ~/path/to/waveforms4j

Manually Compile All Java Classes (skip this if using Eclipse or IntelliJ)

javac src/main/java/org/knowm/waveforms4j/*.java

Take the native methods we've defined in DWF.java and create a header file.

// javah -jni -classpath src/main/java -d ./c org.knowm.waveforms4j.DWF
javah -jni -classpath target/classes -d ./c org.knowm.waveforms4j.DWF

"C:\Program Files\Java\jdk1.8.0_112\bin\javah" -jni -classpath target/classes -d ./c org.knowm.waveforms4j.DWF

Note: You need to take those methods created in the header file and implement them in the C++ file.

Build Waveforms4J DLL for JNI

You need to find where the Java JNI Headers are located first and use it for the first two -I arguments. This is usually somewhere such as: C:\Program Files\Java\jdk1.8.0_112.

cd C:\Users\knowm\Documents\GitHub\waveforms4j
g++ -static -static-libgcc -static-libstdc++ -m64 -Wall -D_JNI_IMPLEMENTATION_ -I"C:\Program Files\Java\jdk-11.0.2\include" -I"C:\Program Files\Java\jdk-11.0.2\include\win32" -shared -o waveforms4j.dll ./c/org_knowm_waveforms4j_DWF.cpp -L"C:\Program Files (x86)\Digilent\WaveFormsSDK\lib\x64" -ldwf
move ./waveforms4j.dll ./src/main/resources

Note: the key to solving the UnsatifiedLinkError was here: http://stackoverflow.com/questions/18138635/mingw-exe-requires-a-few-gcc-dlls-regardless-of-the-code.

I used the program Dependency Walker to figure out that the waveforms4j dll depended on libstdc++-6.dll and it could not link it during run time. The -static -static-libgcc -static-libstdc++ options link it statically during compilation.

Building the JNI Library

The following steps outline how to create the JNI library file and put it in the resources folder, which will get bundled with the deployable jar we build later with Maven. The final step is platform dependent, but the first steps are the same.

Useful Commands (Run in GitBash or Terminal in IntelliJ)

cd /c/Users/knowm/Downloads/Memristor-Discovery/Memristor-Discovery "C:\Program Files\Java\jdk-11.0.2\bin\java.exe" -jar memristor-discovery-0.0.7.jar

"C:\Program Files\Java\jdk-11.0.2\bin\java.exe" -jar C:/Users/knowm/Documents/GitHub/memristor-discovery/target/memristor-discovery-0.0.8-SNAPSHOT.jar

https://medium.com/azulsystems/using-jlink-to-build-java-runtimes-for-non-modular-applications-9568c5e70ef4