Merge pull request #3 from blainesch/feature/workups

Feature/workups - all looks good from here.

Author: codepope

BigRedButton.js

@@ -6,86 +6,95 @@ var util = require('util');
 var events = require('events');
 
 var allDevices;
-var cmd_status=new Buffer([ 0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02 ]);
-var last_state;
+var cmdStatus=new Buffer([ 0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02 ]);
+var lastState;
 
 var LID_DOWN=0x15, LID_UP=0x17, BUTTON_DOWN=0x16;
 
 function getAllDevices()
 {
-    if (!allDevices) {
-        allDevices = HID.devices(7476,13);
-    }
-    return allDevices;
+   if (!allDevices) {
+      allDevices = HID.devices(7476,13);
+   }
+   return allDevices;
 }
 
 function BigRedButton(index)
 {
-    if (!arguments.length) {
-            index = 0;
-    }
-
-    var bigRedButton = getAllDevices();
-    if (!bigRedButton.length) {
-        throw new Error("No BigRedButton could be found");
-    }
-    if (index > bigRedButton.length || index < 0) {
-        throw new Error("Index " + index + " out of range, only " + bigRedButton.length + " BigRedButton found");
-    }
-    this.hid = new HID.HID(bigRedButton[index].path);
-
-    this.hid.write(cmd_status);
-    
-    var that=this;
-    this.hid.read(function(error,data) {
-    	last_state=data[0];
-    	that.hid.read(that.interpretData.bind(that));
-    });
-    setInterval(this.askForStatus.bind(this),100);
+   if (!arguments.length) {
+      index = 0;
+   }
+
+   var bigRedButton = getAllDevices();
+   if (!bigRedButton.length) {
+      throw new Error("No BigRedButton could be found");
+   }
+   if (index > bigRedButton.length || index < 0) {
+      throw new Error("Index " + index + " out of range, only " + bigRedButton.length + " BigRedButton found");
+   }
+   this.button = bigRedButton[index];
+   this.hid = new HID.HID(bigRedButton[index].path);
+
+   this.hid.write(cmdStatus);
+
+   var that=this;
+   this.hid.read(function(error,data) {
+      lastState=data[0];
+      that.hid.read(that.interpretData.bind(that));
+   });
+   this.interval = setInterval(this.askForStatus.bind(this),100);
+   this.close = function() {
+      clearInterval(this.interval);
+      this.interval = false;
+      setTimeout(function() {
+         this.hid.close();
+      }.bind(this), 100);
+   };
 }
 
 util.inherits(BigRedButton, events.EventEmitter);
 
 BigRedButton.prototype.askForStatus = function() {
-	 this.hid.write(cmd_status);
+   this.hid.write(cmdStatus);
 };
 
 BigRedButton.prototype.interpretData = function(error, data) {
-   var n_state=data[0];
-
-   if(last_state!=n_state) {
-   		if(last_state==LID_DOWN && n_state==LID_UP) {
-   			this.emit("lidRaised");
-   		} else if (last_state==LID_UP && n_state==BUTTON_DOWN) {
-   			this.emit("buttonPressed");
-   		} else if(last_state==BUTTON_DOWN && n_state==LID_UP) {
-   			this.emit("buttonReleased");
-   		} else if(last_state==BUTTON_DOWN && n_state==LID_DOWN) {
-   			this.emit("buttonReleased");
-   			this.emit("lidClosed");
-   		} else if(last_state==LID_UP && n_state==LID_DOWN) {
-   			this.emit("lidClosed");
-   		}
-   		last_state=n_state;
+   if (!this.interval || error || !data) {
+      this.close();
+      return;
+   }
+   var newState=data[0];
+
+   if (lastState!=newState) {
+      if (lastState==LID_DOWN && newState==LID_UP) {
+         this.emit("lidRaised");
+      } else if (lastState==LID_UP && newState==BUTTON_DOWN) {
+         this.emit("buttonPressed");
+      } else if (lastState==BUTTON_DOWN && newState==LID_UP) {
+         this.emit("buttonReleased");
+      } else if (lastState==BUTTON_DOWN && newState==LID_DOWN) {
+         this.emit("buttonReleased");
+         this.emit("lidClosed");
+      } else if (lastState==LID_UP && newState==LID_DOWN) {
+         this.emit("lidClosed");
+      }
+      lastState=newState;
    }
 
    this.hid.read(this.interpretData.bind(this));
 }
 
 BigRedButton.prototype.isLidUp = function() {
-	return last_state==LID_UP || last_state==BUTTON_DOWN;
+   return lastState==LID_UP || lastState==BUTTON_DOWN;
 }
 
 BigRedButton.prototype.isButtonPressed = function() {
-	return last_state==BUTTON_DOWN;
+   return lastState==BUTTON_DOWN;
 }
 
 BigRedButton.prototype.isLidDown = function() {
-	return last_state==LID_DOWN;
+   return lastState==LID_DOWN;
 }
 
 exports.BigRedButton = BigRedButton;
 exports.deviceCount = function () { return getAllDevices().length; }
-
-
-