Re: [Gumstix-users] GPIO control via Java

[Jeff S. <jef...@gm...>]

I recently experimented using C shared object libs in Java using
https://jna.dev.java.net/


if [ ! -f jna.jar ];then
wget https://jna.dev.java.net/source/browse/*checkout*/jna/trunk/jnalib/dist/jna.jar
fi
cat << END > hello.c
char* hello()
{
 return "Hello World";
}
END
gcc -shared -o libhello.so hello.c
PWD=`pwd`
export CLASSPATH=.:jna.jar
cat << END > hellow.java
import com.sun.jna.*;
import java.util.*;
class hellow
{
 String oldclasspath = System.setProperty("java.class.path","$PWD");
 public interface helloworld extends Library {
 String hello();
 }
 public static void main(String[] args)
 {
 String oldjnalibpath = System.setProperty("jna.library.path","$PWD");
 helloworld lib = (helloworld)Native.loadLibrary("hello",helloworld.class);
 System.out.println(lib.hello());
 }
}
END
javac hellow.java
java hellow



On 8/3/07, 48...@la... <48...@la...> wrote:
> Before I spend a lot of time spinning my wheels, I thought I'd ask if
> anyone has any experience using Java for GPIO control.
>
> I haven't done anything with GPIO yet, so I suspect there is a very simple
> answer.
>
> I am looking at serial port comms with Java as well.
>
> Will anyone share some advice, experience or example code?
>
> -------
>
> Specifically, I am looking to communicate with a Pololu servo controller
> and a Pololu motor controller over serial.  I am looking to do general IO
> on the GPIO pins.
>
> Thanks in advance!
>
> James
>
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