Added close for GPIO and updated negative ifs

dist/digital-pin.js

@@ -45,12 +45,24 @@
       DigitalPin.prototype.open = function(mode) {
         var _this = this;
         return FS.writeFile("" + GPIO_PATH + "/export", "" + this.pinNum, function(err) {
-          if (!err) {
+          if (err) {
-            _this.self.emit('create');
-            return _this.self._setMode(opts.mode);
-          } else {
             console.log('Error while creating pin files ...');
             return _this.self.emit('error', 'Error while creating pin files');
+          } else {
+            _this.self.emit('open');
+            return _this.self._setMode(mode);
+          }
+        });
+      };
+
+      DigitalPin.prototype.close = function() {
+        var _this = this;
+        return FS.writeFile("" + GPIO_PATH + "/unexport", "" + this.pinNum, function(err) {
+          if (err) {
+            console.log('Error while closing pin files ...');
+            return _this.self.emit('error', 'Error while closing pin files');
+          } else {
+            return _this.self.emit('close');
           }
         });
       };
@@ -96,26 +108,24 @@
         this.mode = mode;
         if (this.mode === 'w') {
           return FS.writeFile("" + GPIO_PATH + "/gpio" + this.pinNum + "/direction", GPIO_DIRECTION_WRITE, function(err) {
-            if (!err) {
+            if (err) {
-              console.log('Pin mode(direction) setup...');
+              console.log('Error occurred while settingup pin mode(direction)...');
+              return _this.self.emit('error', "Setting up pin direction failed");
+            } else {
               _this.pinFile = "" + GPIO_PATH + "/gpio" + _this.pinNum + "/value";
               _this.ready = true;
               return _this.self.emit('open', mode);
-            } else {
-              console.log('Error occurred while settingup pin mode(direction)...');
-              return _this.self.emit('error', "Setting up pin direction failed");
             }
           });
         } else if (mode === 'r') {
           return FS.writeFile("" + GPIO_PATH + "/gpio" + this.pinNum + "/direction", GPIO_DIRECTION_READ, function(err) {
-            if (!err) {
+            if (err) {
-              console.log('Pin mode(direction) setup...');
+              console.log('Error occurred while settingup pin mode(direction)...');
+              return _this.self.emit('error', "Setting up pin direction failed");
+            } else {
               _this.pinFile = "" + GPIO_PATH + "/gpio" + _this.pinNum + "/value";
               _this.ready = true;
               return _this.self.emit('open', mode);
-            } else {
-              console.log('Error occurred while settingup pin mode(direction)...');
-              return _this.self.emit('error', "Setting up pin direction failed");
             }
           });
         }
@@ -134,6 +144,4 @@
     })(EventEmitter);
   });
 
-  module.exports = Cylon.IO.DigitalPin;
-
 }).call(this);

examples/pure_gpio.coffee

@@ -1,13 +1,13 @@
-DigitalPin = require('../dist/digital-pin')
+require('../dist/digital-pin')
 
-pin4 = new DigitalPin(pin: 4)
+pin4 = new Cylon.IO.DigitalPin(pin: 4)
 
 pin4.on('create', (data) ->
   console.log("Pin files have been created")
 )
 
 pin4.on('open', (data) ->
-  console.log("Pin ready for writing!")
+  console.log("Pin mode has been setup!")
   pin4.digitalWrite(1)
 )
 

src/digital-pin.coffee

@@ -33,15 +33,24 @@ namespace 'Cylon.IO', ->
     open: (mode) ->
       # Creates the GPIO file to read/write from
       FS.writeFile("#{ GPIO_PATH }/export", "#{ @pinNum }", (err) =>
-        unless(err)
+        if(err)
-          @self.emit('create')
-          @self._setMode(opts.mode)
-        else
           console.log('Error while creating pin files ...')
           @self.emit('error', 'Error while creating pin files')
+        else
+          @self.emit('open')
+          @self._setMode(mode)
       )
 
 
+    close: ->
+      FS.writeFile("#{ GPIO_PATH }/unexport", "#{ @pinNum }", (err) =>
+        if(err)
+          console.log('Error while closing pin files ...')
+          @self.emit('error', 'Error while closing pin files')
+        else
+          @self.emit('close')
+      )
+
     digitalWrite: (value) ->
       @self._setMode('w') unless @mode == 'w'
       @status = if (value == 1) then 'high' else 'low'
@@ -75,25 +84,23 @@ namespace 'Cylon.IO', ->
       @mode = mode
       if @mode == 'w'
         FS.writeFile("#{ GPIO_PATH }/gpio#{ @pinNum }/direction", GPIO_DIRECTION_WRITE, (err) =>
-          unless (err)
+          if (err)
-            console.log('Pin mode(direction) setup...')
+            console.log('Error occurred while settingup pin mode(direction)...')
+            @self.emit('error', "Setting up pin direction failed")
+          else
             @pinFile = "#{ GPIO_PATH }/gpio#{ @pinNum }/value"
             @ready = true
             @self.emit('open', mode)
-          else
-            console.log('Error occurred while settingup pin mode(direction)...')
-            @self.emit('error', "Setting up pin direction failed")
         )
       else if mode =='r'
         FS.writeFile("#{ GPIO_PATH }/gpio#{ @pinNum }/direction", GPIO_DIRECTION_READ, (err) =>
-          unless (err)
+          if (err)
-            console.log('Pin mode(direction) setup...')
+            console.log('Error occurred while settingup pin mode(direction)...')
+            @self.emit('error', "Setting up pin direction failed")
+          else
             @pinFile = "#{ GPIO_PATH }/gpio#{ @pinNum }/value"
             @ready = true
             @self.emit('open', mode)
-          else
-            console.log('Error occurred while settingup pin mode(direction)...')
-            @self.emit('error', "Setting up pin direction failed")
         )
 
     toggle: ->
@@ -101,6 +108,3 @@ namespace 'Cylon.IO', ->
         @self.digitalWrite(1)
       else
         @self.digitalWrite(0)
-
-module.exports = Cylon.IO.DigitalPin
-