access GPIO pins on android 10

[Sohrab 1]

How can I access GPIO pins on android 10 without root access?

I have a 2s tinker board and I want to access serial pins.

 

Thank you in advance

[yi-hsin_hung 3]

Hi @Sohrab:

     Please reference the following wiki for Tinker Board 2 (RK3399) mraa library on Android.

https://github.com/TinkerBoard/TinkerBoard/wiki/Developer-Guide#mraa-library-for-android

[hisataro 0]

Hello @yi-hsin_hung

I want to use the mraa library in Unity, can you tell me the package name?

ex unity C# code)
AndroidJavaObject _javaClass = new AndroidJavaObject ("com.tinkerboard.mraa");

[hisataro 0]

Hello @yi-hsin_hung

I want to use the mraa library in Unity, can you tell me the class name?

ex unity C# code)
AndroidJavaObject _javaClass = new AndroidJavaObject ("com.tinkerboard.mraa"); ?

[yi-hsin_hung 3]

Hi @hisataro:

    Have a nice day! The mraa android library can be included by the following code on Android studio and we didn't support C# at current.

import mraa.*;

Thank a lot!

[hisataro 0]

Hi @yi-hsin_hung

It worked by using mraa-2.0.0.aar directly from Unity !

 

// Put aar to Unity Plugin Folder

UnityProjectFolder/Assets/Plugin/Android/mraa-2.0.0.aar

 

// Gpio Instance
AndroidJavaClass _TinkerBoard = new AndroidJavaClass("mraa.TinkerBoard");
AndroidJavaObject _TINKERBOARD_PIN3 = _TinkerBoard.GetStatic<AndroidJavaObject>("TINKERBOARD_PIN3");
int swigValue = _TINKERBOARD_PIN3.Call<int>("swigValue");
AndroidJavaObject _Gpio = new AndroidJavaObject("mraa.Gpio", swigValue);

// Dir instance
AndroidJavaClass _Dir = new AndroidJavaClass("mraa.Dir");
AndroidJavaObject _DIR_IN = _Dir.GetStatic<AndroidJavaObject>("DIR_IN");

// Mode Instance
AndroidJavaClass _Mode = new AndroidJavaClass("mraa.Mode");
AndroidJavaObject _MODE_PULLUP = _Mode.GetStatic<AndroidJavaObject>("MODE_PULLUP");

// Call Gpio.read()
AndroidJavaObject resultDir = null;
AndroidJavaObject resultMode = null;

resultDir = _Gpio.Call<AndroidJavaObject>("dir", _DIR_IN);
resultMode = _Gpio.Call<AndroidJavaObject>("mode", _MODE_PULLUP);
int result = _Gpio.Call<int>("read");
 

Tahnk you.

[yi-hsin_hung 3]

Hi @hisataro:

     Good news about this. It's a good experience for us. Thanks!  

[Turtley 0]

Hi @yi-hsin_hung, how can I add mraa library to Android studio? When I typed import mraa.* it said "Unresolved reference: mraa"

[yi-hsin_hung 3]

Hi @Turtley:

    Please reference the https://github.com/TinkerBoard/TinkerBoard/wiki/Developer-Guide#mraa-library-for-android

Thank a lot!

[Turtley 0]

Hi @yi-hsin_hung:

Thanks for your reply! I read that before and got the mraa.aar file but didn't know how to make it Android studio library. I've jut tried to put that file into app/libs then add the libs folder to the dependencies and it seems work