en:c1_enhancement_gpio40_on_android [ODROID Wiki]

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==== Having GPIO functions on Android ====

** You must install the Android release V1.5 or higher to access the 40pin GPIO properly.**

This process explains how to make an Android app which can access IO ports.\\
You need to install Google Android SDK/NDK on your host PC first to start below steps.

Insert this line into your ~/.bashrc file.

<code>
export NDK_PATH=/home/xxx/android-ndk-r10d
</code>

1. Download the wiringPi library and example App source code.

[[https://github.com/codewalkerster/example-wiringPi]]
<code>
$ git clone https://github.com/codewalkerster/example-wiringPi
</code>

2. Build a JNI library
<code>
$ cd example-wiringPi
$ cd jni
$ ndk-build
Android NDK: WARNING: APP_PLATFORM android-19 is larger than android:minSdkVersion 16 in /media/codewalker/92fc070a-3bc1-43e0-af27-03d08ba9dd3e/home/codewalker/workspace/example-wiringPi/AndroidManifest.xml    
[armeabi] Compile thumb  : wiringPi <= wiringPi.c
/media/codewalker/92fc070a-3bc1-43e0-af27-03d08ba9dd3e/home/codewalker/workspace/example-wiringPi/jni/wiringPi/wiringPi.c:147:0: warning: "PAGE_SIZE" redefined [enabled by default]
 #define PAGE_SIZE   (4*1024)
 ^
In file included from /home/codewalker/projects/android-ndk-r10d/platforms/android-21/arch-arm/usr/include/signal.h:34:0,
                 from /home/codewalker/projects/android-ndk-r10d/platforms/android-21/arch-arm/usr/include/poll.h:34,
                 from /media/codewalker/92fc070a-3bc1-43e0-af27-03d08ba9dd3e/home/codewalker/workspace/example-wiringPi/jni/wiringPi/wiringPi.c:59:
/home/codewalker/projects/android-ndk-r10d/platforms/android-21/arch-arm/usr/include/limits.h:119:0: note: this is the location of the previous definition
 #define PAGE_SIZE 4096
 ^
/media/codewalker/92fc070a-3bc1-43e0-af27-03d08ba9dd3e/home/codewalker/workspace/example-wiringPi/jni/wiringPi/wiringPi.c: In function 'interruptHandler':
/media/codewalker/92fc070a-3bc1-43e0-af27-03d08ba9dd3e/home/codewalker/workspace/example-wiringPi/jni/wiringPi/wiringPi.c:1865:7: warning: return makes pointer from integer without a cast [enabled by default]
       return wiringPiFailure (WPI_FATAL, "wiringPiISR: wiringPi has not been initialised. Unable to continue.\n") ;
       ^
[armeabi] Compile thumb  : wiringPi <= wiringShift.c
[armeabi] Compile thumb  : wiringPi <= piHiPri.c
[armeabi] Compile thumb  : wiringPi <= piThread.c
[armeabi] Compile thumb  : wiringPi <= wiringPiSPI.c
[armeabi] Compile thumb  : wiringPi <= wiringPiI2C.c
[armeabi] Compile thumb  : wiringPi <= softPwm.c
[armeabi] Compile thumb  : wiringPi <= softTone.c
[armeabi] Compile thumb  : wiringPi <= mcp23008.c
[armeabi] Compile thumb  : wiringPi <= mcp23016.c
[armeabi] Compile thumb  : wiringPi <= mcp23017.c
[armeabi] Compile thumb  : wiringPi <= mcp23s08.c
[armeabi] Compile thumb  : wiringPi <= mcp23s17.c
[armeabi] Compile thumb  : wiringPi <= sr595.c
[armeabi] Compile thumb  : wiringPi <= pcf8574.c
[armeabi] Compile thumb  : wiringPi <= pcf8591.c
[armeabi] Compile thumb  : wiringPi <= mcp3002.c
[armeabi] Compile thumb  : wiringPi <= mcp3004.c
[armeabi] Compile thumb  : wiringPi <= mcp4802.c
[armeabi] Compile thumb  : wiringPi <= mcp3422.c
[armeabi] Compile thumb  : wiringPi <= max31855.c
[armeabi] Compile thumb  : wiringPi <= max5322.c
[armeabi] Compile thumb  : wiringPi <= sn3218.c
[armeabi] SharedLibrary  : libwiringPi.so
[armeabi] Install        : libwiringPi.so => libs/armeabi/libwiringPi.so
[armeabi] Compile thumb  : wiringPiDev <= ds1302.c
[armeabi] Compile thumb  : wiringPiDev <= maxdetect.c
[armeabi] Compile thumb  : wiringPiDev <= piNes.c
[armeabi] Compile thumb  : wiringPiDev <= gertboard.c
[armeabi] Compile thumb  : wiringPiDev <= piFace.c
[armeabi] Compile thumb  : wiringPiDev <= lcd128x64.c
[armeabi] Compile thumb  : wiringPiDev <= lcd.c
[armeabi] Compile thumb  : wiringPiDev <= piGlow.c
[armeabi] SharedLibrary  : libwiringPiDev.so
[armeabi] Install        : libwiringPiDev.so => libs/armeabi/libwiringPiDev.so
[armeabi] Compile thumb  : wpi_android <= wpi_android.c
[armeabi] SharedLibrary  : libwpi_android.so
[armeabi] Install        : libwpi_android.so => libs/armeabi/libwpi_android.so
[~/workspace/example-wiringPi/jni]$ 
</code>

3. Import project * build it on the Android SDK.

== ADC ===
{{http://dn.odroid.com/homebackup/android_wiringPi_ADC.png?600|}}

[[https://www.youtube.com/watch?v=zyfULOkj0Vw]]

== PWM ===
{{http://dn.odroid.com/homebackup/android_wiringPi_PWM.png?600|}}

== I2C ===
{{http://dn.odroid.com/homebackup/android_wiringPi_I2C.png?600|}}

== UART ===
{{http://dn.odroid.com/homebackup/android_wiringPi_UART.png?600|}}

== 1 Wire ===
{{http://dn.odroid.com/homebackup/android_wiringPi_1wire.png?600|}}