Support Sinovoip's Banana Pi M1+

[malkusch]

The statically linked Banana Pro wiringpi library doesn't work with Banana Pi M1+. This is no surprise as the BPI-M1+ uses a different pin numbering. However it took me some time to understand that and also to find a solution. So I like to abuse this issue mainly for documentation:

Until pi4j supports a further platform which is linked against BPI-WiringPi you can still use Pi4j with the Banana Pi M1+.

• Install BPI-WiringPi.
• Configure the Banana Pro platform
• Configure pi4j to use dynamic linking java -Dpi4j.linking=dynamic.

[savageautomate]

@malkusch,

UPDATE
I have just added experimental support for the Sinovoip BPI series "BananaPi" variants.

COMMIT: 92f0658

This is included in the the latest 1.2-SNAPSHOT build now.

Please note that I do not have any of these devices so I'm not able to really test it.
I have included a new "bpi" platform that you have to choose when starting your program.

        // ####################################################################
        //
        // since we are not using the default Raspberry Pi platform, we should
        // explicitly assign the platform as the Sinovoip BPI platform.
        //
        // ####################################################################
        PlatformManager.setPlatform(Platform.BPI);

STATUS:

• I have added support for building the BPI-WiringPi library (https://github.com/BPI-SINOVOIP/WiringPi) and embedding them inside the Pi4J JARs.
• I have created a new BpiGpioProvider (https://github.com/Pi4J/pi4j/blob/master/pi4j-core/src/main/java/com/pi4j/io/gpio/BpiGpioProvider.java) and BpiPin (https://github.com/Pi4J/pi4j/blob/master/pi4j-core/src/main/java/com/pi4j/io/gpio/BpiPin.java) class that should be used.
• The BpiPin class is purely a copy from the BananaPro class, I have not verified the pin mappings with the BPI devices.
• I have not tested anything (other than the build)
• I have not added any samples to the examples yet.
• Board detection (M1, M2, M3, M1+, M2+, M2P, etc) has not been added yet.

Feel free to start testing it and report back any issue .. or better yet submit pull requests with fixes.

Thanks, Robert