examples: Added JavaScript gpio tool

Signed-off-by: Henry Bruce <henry.bruce@intel.com>

examples/javascript/gpio-tool.js

@@ -0,0 +1,100 @@
+/*
+ * Author: Henry Bruce <henry.bruce@intel.com>
+ * Copyright (c) 2016 Intel Corporation.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+var mraa = require('mraa');
+const readline = require('readline');
+
+const rl = readline.createInterface({
+  input: process.stdin,
+  output: process.stdout
+});
+
+function printUsage() {
+    console.log("version     Print version");
+    console.log("get pin     Get pin value");
+}
+
+function getVersion() {
+    console.log('MRAA Version: ' + mraa.getVersion());
+}
+
+function setPin() {
+    var pinNumber = arguments[0];
+    var pinValue = arguments[1];
+    var pin = new mraa.Gpio(pinNumber);
+    pin.dir(mraa.DIR_OUT);
+    pin.write(pinNumber, pinValue);
+}
+
+function getPin() {
+    var pinNumber = arguments[0];
+    var pin = new mraa.Gpio(pinNumber);
+    pin.dir(mraa.DIR_IN);
+    console.log('Gpio ' + pinNumber + ' = ' + pin.read());
+}
+
+function onPinLevelChange() {
+    console.log('gpio change');
+}
+
+function monitorPin() {
+    var pinNumber = arguments[0];
+    var pin = new mraa.Gpio(pinNumber);
+    pin.dir(mraa.DIR_IN);
+    pin.isr(mraa.EDGE_BOTH, onPinLevelChange);
+    rl.question('Press ENTER to stop', function(answer) {
+        rl.close();
+    });
+}
+
+const args = process.argv;
+const argc = args.length;
+if (argc >= 3) {
+    const cmd = args[2];
+    switch (args[2]) {
+    case "version":
+        getVersion();
+        break;
+    case "get":
+        var pinNumber = parseInt(args[3]);
+        getPin(pinNumber);
+        break;
+    case "set":
+        var pinNumber = parseInt(args[3]);
+        var pinValue = parseInt(args[4]);
+        getPin(pinNumber, pinValue);
+        break;
+    case "monitor":
+        var pinNumber = parseInt(args[3]);
+        monitorPin(pinNumber);
+        break;
+    default:
+        console.log("Invalid command " + args[2]);
+        break;
+    }
+} else {
+    console.log("Command not specified");
+    printUsage();
+}
+