java gpio: commit, tested and running

README.md

@@ -19,7 +19,7 @@ Layers
 --
 
 The following layers are available:
-* meta-chip-example-java: JAVA OpenJDK with Hello World application.
+* meta-chip-example-java: JAVA OpenJDK with Hello World and DIO applications to test the installation and show how to drive the hardware.
 * meta-chip-example-1wire: usage of 1-Wire devices. Demonstrate how to easily patch the kernel with fragments and the device tree with patch files.
 * meta-chip-example-spidev: usage of SPI interface. Second example to demonstrate how to patch the kernel with fragments and the device tree with patch files.
 

meta-chip-example-java/README.md

@@ -20,6 +20,7 @@ Images
 
 The following images are available:
 * chip-image-example-java-helloworld: image with JAVA and Hello World application to test the installation.
+* chip-image-example-java-dio: image with JAVA and GPIO application to show how to drive the hardware from JAVA application.
 
 The wanted image is chosen during the build with bitbake command.
 
@@ -36,12 +37,24 @@ Add "meta-chip-examples/meta-chip-example-java" and "meta-java" to the bitbake l
 
 See the README file of the meta-chip layer (from my GitHub https://github.com/myfreescalewebpage/meta-chip) to check details about building and flashing images on the C.H.I.P. board.
 
-After flashing the image on the C.H.I.P. board, the file "helloworld.jar" will be in "/home/root". Execute the following command:
+### chip-image-example-java-helloworld
 
-	java -classpath /home/root -jar /home/root/helloworld.jar
+After flashing the image on the C.H.I.P. board, the file "helloworld.jar" will be in "/usr/local/java". Execute the following command:
+
+	java -jar /usr/local/java/helloworld.jar
 
 The text "Hello World!" in the console indicates that the application is correctly executed.
 
+### chip-image-example-java-dio
+
+After flashing the image on the C.H.I.P. board, the file "gpio.jar" will be in "/usr/local/java". Connect a LED throw a resitor on the pin PE5 (CSI-D1 on C.H.I.P.). Execute the following command:
+
+	java -Djava.security.policy=/home/root/java.policy -jar /usr/local/java/gpio.jar PE5
+
+The LED is blinking several times and the application terminates.
+
+Important note: the policy file is set to permit access to the hardware.
+
 
 Contributing
 --

meta-chip-example-java/recipes-skeleton/gpio/files/gpio.java

@@ -0,0 +1,66 @@
+package dio.gpio;
+
+import jdk.dio.*;
+import jdk.dio.gpio.*;
+import java.io.IOException;
+
+public class gpio {
+
+	public static void main(String[] args) {
+
+		/* Check arguments */
+		if ((args.length != 1) || (args[0].length() < 3)) {
+			System.out.println("Expecting pin as arguement");
+			System.exit(0);
+		}
+
+		/* Convert to port and pin */
+		char port = args[0].toUpperCase().charAt(1);
+		int number = Integer.valueOf(args[0].substring(2), 10).intValue();
+		if ((port < 'A') || (port > 'Z') || (number < 0) || (number > 32)) { 
+			System.out.println("Impossible to decode pin port and number");
+			System.exit(0);
+		}
+
+		/* Compute pin number: 32 * (port - 'A') + pin */
+		int pinNumber = 32 * (port - 'A') + number;
+
+		/* Start blinking */
+		System.out.println("Blinking LED on GPIO pin number " + pinNumber + " (" + args[0] + ")");
+
+		GPIOPin pin = null;
+
+		try {
+
+			GPIOPinConfig pinConfig = new GPIOPinConfig(DeviceConfig.DEFAULT, pinNumber, GPIOPinConfig.DIR_OUTPUT_ONLY, GPIOPinConfig.MODE_OUTPUT_PUSH_PULL, GPIOPinConfig.TRIGGER_NONE, false);
+			pin = (GPIOPin)DeviceManager.open(GPIOPin.class, pinConfig);
+
+			boolean pinOn = false;
+			for (int i = 0; i < 20; i++) {
+				Thread.sleep(1000);
+				pinOn = !pinOn;
+				pin.setValue(pinOn);
+			}
+
+		} catch (IOException ioe) {
+
+			System.out.println("IOException while opening device. Make sure you have the appropriate operating system permission to access GPIO devices");
+
+		} catch(InterruptedException ie) {
+
+			System.out.println("InterruptedException while blinking the LED");
+
+		} finally {
+
+			try {
+
+				System.out.println("Closing GPIO pin number " + pinNumber + " (" + args[0] + ")");
+				if (pin != null) pin.close();
+
+			} catch (Exception e) {
+
+			System.out.println("Received exception while trying to close device");
+			}
+		}
+	}
+}

meta-chip-example-java/recipes-skeleton/gpio/files/manifest

@@ -0,0 +1,4 @@
+Manifest-Version: 1.0
+Main-Class: dio.gpio.gpio
+Implementation-Version: 0.1
+Class-Path: /usr/share/java/dio.jar

meta-chip-example-java/recipes-skeleton/gpio/gpio_0.1.bb

@@ -1,4 +1,4 @@
-SUMMARY = "JAVA GPIOLEDSample OpenJdk DIO example"
+SUMMARY = "JAVA gpio OpenJdk DIO example"
 SECTION = "examples"
 LICENSE = "MIT"
 LIC_FILES_CHKSUM = "file://${COMMON_LICENSE_DIR}/MIT;md5=0835ade698e0bcf8506ecda2f7b4f302"
@@ -11,7 +11,7 @@ RDEPENDS_${PN} = "openjdk-7-jre openjdk-dio"
 PR = "r0"
 
 SRC_URI = " \
-  file://GPIOLEDSample.java \
+  file://gpio.java \
   file://manifest \
 "