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AT91SAM JNI demo project introduction

AT91SAM JNI demo project introduction. JNI Demo Project - Overview. Goal Environment Setup Install JDK 6 Install Android SDK Install Eclipse Install ADT for Eclipse Install Android NDK C Native code in JNI demo project are already built as a shared library. You can run the demo directly.

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AT91SAM JNI demo project introduction

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  1. AT91SAM JNI demo project introduction

  2. JNI Demo Project - Overview • Goal • Environment Setup • Install JDK 6 • Install Android SDK • Install Eclipse • Install ADT for Eclipse • Install Android NDK • C Native code in JNI demo project are already built as a shared library. You can run the demo directly. • Reference to http://developer.android.com/sdk/installing.html C functions Android UI button LED JNI

  3. JNI Demo Project - C native code • Provide functions to control LED • Open LED device file, then write 1/0 to the file • Works like following command line: • echo 1 > /sys/class/leds/dx/brightness • echo 0 > /sys/class/leds/dx/brightness • JNI prefix • Composed by: • Java • Name space • package com.example.jnidemo; • Class Name • publicclass JNIDemo extends Activity implements • Function name • For example: • Java_com_example_jnidemo_JNIDemo_turnOnLed • Java_com_example_jnidemo_JNIDemo_turnOffLed • Build as a shared library for JAVA to call • Android.mk • include $(BUILD_SHARED_LIBRARY) • Needs Android NDK to build • ndk-build

  4. Create UI buttons Call JNI interface when clicked publicnativeint turnOnLed(); publicnativeint turnOffLed(); Load native library when class is loaded static { System.loadLibrary("led_control"); } JNI Demo Project - Java code

  5. JNI Demo Project - Deploy • Use adb tool to create USB connection • http://www.at91.com/android4sam/bin/view/Android4SAM/UsingAdb • Connect USB cable to EK board (need install USB device driver) • Run adb • ./android update adb • Modify .android\adb_usb.ini • sudo ./adb start-server • Before running JNI demo • chmod 666 /sys/class/leds/dx/brightness • Change the permission for java application can read/write • After reboot system also need run above command • Deploy in the board • ./adb install *.apk • Or using Eclipse IDE • Android SDK, Eclipse and ADT installed • Import this project to work space • Run -> Run As -> Android Application

  6. JNI Demo Project - Running • Running JNI demo • Click “Turn On/Off LED” to turn on/off LED ‘D2’ or ‘D6’. • Debug information will be printed in serial port when logcat is running • Debugging in board • logcat & D2 D6

  7. More information about AT91SAM OS Ecosystem AT91SAM Linux Ecosystem http://www.linux4sam.org AT91SAM Android Ecosystem http://www.at91.com/android4sam AT91SAM WinCE Ecosystem http://www.at91.com/windows4sam AT91SAM community forum http://www.at91.com

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