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--- en:c_tinkering [2016/02/29 14:23]
john1117 created
+++ en:c_tinkering [2017/03/02 09:55] (current)
brian.kim [Python example]
@@ Line 32: / Line 32: @@
 ===== Linux =====
-==== C example ====
+==== C example (With WiringPi) ====
-. Get the wiringPi library compatible **ODROID series**
+. Get the wiringPi library compatible **ODROID**
+  sudo apt update && sudo apt install git
   git clone https://github.com/hardkernel/wiringPi
@@ Line 53: / Line 54: @@
   * [[https://github.com/hardkernel/WiringPi2-Python|WiringPi2-Python repository for ODROID]]
-**Prerequisites**: You must have //python-dev// and //python-setuptools// installed If you manually rebuild the bindings with swig-python wiringpi.i
+**Prerequisites**: You must have //**python-dev**// and //**python-setuptools**// installed If you manually rebuild the bindings with swig-python wiringpi.i
-  sudo apt-get install python-dev python-setuptools
+  sudo apt-get install python-dev python-setuptools swig3.0
 . Get/setup WiringPi 2 for Python repository
@@ Line 67: / Line 68: @@
 . Build & install
-  sudo python setup.py install
+<code>
+swig3.0 -python -threads wiringpi.i
+sudo python setup.py install
+</code>
+Or
+<code>
+./build.sh
+</code>
 . Get/Run the example source code
@@ Line 74: / Line 82: @@
   wget http://dn.odroid.com/source_peripherals/ctinkeringkit/example-led.py
   sudo python example-led.py
+===== Android =====
+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>
+. Download the wiringPi library and example App source code.
+<code>
+# git clone https://github.com/codewalkerster/example-led
+</code>
+. Build a JNI library
+<code>
+$ cd example-led
+$ cd jni
+$ ndk-build
+Android NDK: WARNING: APP_PLATFORM android-16 is larger than android:minSdkVersion 7 in /media/codewalker/92fc070a-3bc1-43e0-af27-03d08ba9dd3e/home/codewalker/workspace/xxxx/example-led/AndroidManifest.xml
+[armeabi] Compile thumb  : wiringPi <= wiringPi.c
+/media/codewalker/92fc070a-3bc1-43e0-af27-03d08ba9dd3e/home/codewalker/workspace/xxxx/example-led/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/xxxx/example-led/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/xxxx/example-led/jni/wiringPi/wiringPi.c: In function 'interruptHandler':
+/media/codewalker/92fc070a-3bc1-43e0-af27-03d08ba9dd3e/home/codewalker/workspace/xxxx/example-led/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
+</code>
+. Import existing project to the eclipse IDE.
+{{http://dn.odroid.com/Tinkering_Kit/Screenshot%20from%202015-04-10%2010:41:11.png?500|}}
+. Run example-led
+{{http://dn.odroid.com/Tinkering_Kit/device-2015-04-10-103856.png?600|}}
+[[https://www.youtube.com/watch?v=zyfULOkj0Vw|]]
+. Source code browsing!
+**//Add below items in jni/Android.mk to build libwingPi.so and libwingPiDev.so//**
+<code>
+include $(CLEAR_VARS)
+LOCAL_C_INCLUDES += \
+    $(NDK_PATH)/platforms/android-21/arch-arm/usr/include \
+    $(LOCAL_PATH)/wiringPi
+LOCAL_MODULE    := wiringPi
+LOCAL_SRC_FILES := \
+    wiringPi/wiringPi.c \
+    wiringPi/wiringShift.c \
+    wiringPi/piHiPri.c \
+    wiringPi/piThread.c \
+    wiringPi/wiringPiSPI.c \
+    wiringPi/wiringPiI2C.c \
+    wiringPi/softPwm.c \
+    wiringPi/softTone.c \
+    wiringPi/mcp23008.c \
+    wiringPi/mcp23016.c \
+    wiringPi/mcp23017.c \
+    wiringPi/mcp23s08.c \
+    wiringPi/mcp23s17.c \
+    wiringPi/sr595.c \
+    wiringPi/pcf8574.c \
+    wiringPi/pcf8591.c \
+    wiringPi/mcp3002.c \
+    wiringPi/mcp3004.c \
+    wiringPi/mcp4802.c \
+    wiringPi/mcp3422.c \
+    wiringPi/max31855.c \
+    wiringPi/max5322.c \
+    wiringPi/sn3218.c
+LOCAL_CFLAGS    += -UNDEBUG -DANDROID
+LOCAL_LDLIBS    := -ldl -llog
+include $(BUILD_SHARED_LIBRARY)
+include $(CLEAR_VARS)
+LOCAL_C_INCLUDES += \
+    $(NDK_PATH)/platforms/android-21/arch-arm/usr/include \
+    $(LOCAL_PATH)/wiringPi
+LOCAL_MODULE    := wiringPiDev
+LOCAL_SRC_FILES := \
+    devLib/ds1302.c \
+    devLib/maxdetect.c \
+    devLib/piNes.c \
+    devLib/gertboard.c \
+    devLib/piFace.c \
+    devLib/lcd128x64.c \
+    devLib/lcd.c \
+    devLib/piGlow.c
+LOCAL_SHARED_LIBRARIES := libwiringPi
+LOCAL_CFLAGS    += -UNDEBUG
+include $(BUILD_SHARED_LIBRARY)
+</code>
+//**Make some JNI API functions to access the wirinPi library.**//
+<code>
+jint Java_com_hardkernel_wiringpi_MainActivity_analogRead(JNIEnv* env, jobject obj, jint port) {
+    return analogRead(port);
+}
+void Java_com_hardkernel_wiringpi_MainActivity_digitalWrite(JNIEnv* env, jobject obj, jint port, jint onoff) {
+    digitalWrite(port, onoff);
+}
+int Java_com_hardkernel_wiringpi_MainActivity_wiringPiSetupSys(JNIEnv* env, jobject obj) {
+    wiringPiSetupSys();
+    return 0;
+}
+</code>
+//**Declare GPIO ports.**//
+<code>
+    private final int ledPorts[] = {
+, // GPIOX.BIT0(#97)
+, // GPIOX.BIT11(#108)
+, // GPIOX.BIT3(#100)
+, // GPIOX.BIT4(#101)
+, // GPIOX.BIT8(#105)
+, // GPIOX.BIT9(#106)
+, // GPIOX.BIT10(#107)
+,  // GPIOX.BIT18(#115)
+,  // GPIOX.BIT19(#116)
+,  // GPIOY.BIT8(#88)
+,  // GPIOY.BIT3(#83)
+,  // GPIOY.BIT7(#87)
+,  // GPIOX.BIT7(#104)
+,  // GPIOX.BIT5(#102)
+,  // GPIOX.BIT6(#103)
+, // GPIOX.BIT20(#117)
+, // GPIOX.BIT2(#99)
+, // GPIOX.BIT21(#118)
+, // GPIOX.BIT1(#98)
+    };
+</code>
+//**Define JNI functions**//
+<code>
+    public native int wiringPiSetupSys();
+    public native int analogRead(int port);
+    public native void digitalWrite(int port, int onoff);
+    static {
+        System.loadLibrary("wpi_android");
+    }
+</code>
+//**Generate GPIO access nodes**//
+Make SYSFS GPIO access nodes with the /sys/class/gpio/export \\
+Change the GPIO pins to output mode via direction node.\\ Don't forget to change the permissions for those nodes.
+<code>
+    boolean exportGPIO() {
+        try {
+            DataOutputStream os = new DataOutputStream(mProcess.getOutputStream());
+            for (int port: ledPorts) {
+                os.writeBytes("echo " +  port + " > /sys/class/gpio/export\n");
+                os.writeBytes("chmod 666 /sys/class/gpio/gpio" + port + "/direction\n");
+                os.writeBytes("echo out > /sys/class/gpio/gpio" + port + "/direction\n");
+                os.writeBytes("chmod 666 /sys/class/gpio/gpio" + port + "/value\n");
+            }
+            os.flush();
+        } catch (IOException e1) {
+            // TODO Auto-generated catch block
+            e1.printStackTrace();
+            return false;
+        }
+        return true;
+    }
+</code>
+Korean: wiringPi의 "/dev/mem"을 open 하여 mmap을 사용하는 방식으로 만들려고 하였으니 "/dev/mem"은 root가 아니면 접근을 제한하도록 되어 있어서 불가능합니다.
+jni의 library에는 root 권한을 줄 방법이 없습니다.
+English: It was impossible to access the /dev/mem in the Android platform because only root can access it.
+There is no way to add a root permission to the JNI library.
+//**Let's display and access the GPIO**//
+This function runs every 100msec.\\
+It reads the ADC value and update the GUI as well as LED level meter.\\
+The CdS optical sensor is connected to the ADC.\\
+<code>
+    public void update() {
+        int i = 0;
+        int adcValue = 0;
+        int ledPos = 0;
+        if ((adcValue = analogRead (PORT_ADC1)) > 0) {
+            ledPos = (adcValue * ledPorts.length * 1000) / 1024;
+            ledPos = (ledPorts.length - (ledPos / 1000));
+            mADC.setProgress(adcValue);
+        } else
+            ledPos = 0;
+        for (i = 0; i < ledPorts.length; i++) {
+            digitalWrite (ledPorts[i], 0);
+            mLeds.get(i).setChecked(false);
+        }
+        for (i = 0; i < ledPos; i++) {
+            digitalWrite (ledPorts[i], 1);
+            mLeds.get(i).setChecked(true);
+        }
+        if (!mStop)
+            handler.postDelayed(runnable, 100);
+    }
+</code>
+Note that wiringPiSetupSys() should be called once to initialize the wiringPi library.