JNI Interface for National Instruments Drivers. National Instruments does not currently provide language interfaces for Java. This package is a DLL wrapper using Java Native Interface for National Instruments drivers. It includes the DLL wrapper and some sample code for doing some of the most common NI tasks such as creating a task, outputting a digital signal and reading an analogue input.
National instruments describe the problem: http://digital.ni.com/public.nsf/allkb/802A9D349090D3F5862565CC0076BCF9
This library is used for a train cab simulator at the Birmingham University BCRRE (Birmingham Centre for Railway Research and Education). It reads analogue and digital inputs from two DAQ devices connected to the cab to interface with train controller handles and buttons. The package currently fulfils this function and can do basic digital and analogue reads as well as digital output (not required for the cab).
As the package uses JNI, it is platform dependent and only works on windows systems.
The kirkwood.nidaq.jna.Nicaiu class is a JNI wrapper, created using JNAerator (http://jnaerator.googlecode.com/), for the National instruments DLL. A selection of methods are used from the DLL, enabling my device (Ni-DAQ USB-6000) to be demonstrated by writing digital out lines and reading back analog input lines. A complete list of methods is in the text file Nicaiu_Full.txt. If you require additional methods, they can be cut/pasted into the Nicaiu.java class.
The kirkwood.nidaq.access.NiDaq class is a middle layer between the application and the wrapper class that simplifies some of the interfaces and handles errors via the kirkwood.nidaq.access.NiDaqException class. My intention is to add methods to this class as I add methods to the DLL wrapper, however you may prefer to access the wrapper class directly, or write your own middle layer, depending on your application.
Email me: d.kirkwood@bham.ac.uk if you'd like to help out with this project.