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Change event triggers in callbacks to fat arrows to keep obj scope.

This commit is contained in:
Edgar O Silva 2013-11-04 22:02:51 -06:00
parent 87a75745dd
commit 33f8c95edc
3 changed files with 53 additions and 42 deletions
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47
dist/digital-pin.js vendored
View File

@ -36,81 +36,86 @@
LOW = 0;
function DigitalPin(opts) {
this.self = this;
this.pinNum = opts.pin;
this.status = 'low';
this.ready = false;
}
DigitalPin.prototype.open = function(mode) {
var _this = this;
return FS.writeFile("" + GPIO_PATH + "/export", "" + this.pinNum, function(err) {
if (!err) {
this.emit('create');
return this._setMode(opts.mode);
_this.self.emit('create');
return _this.self._setMode(opts.mode);
} else {
console.log('Error while creating pin files ...');
return this.emit('error', 'Error while creating pin files');
return _this.self.emit('error', 'Error while creating pin files');
}
});
};
DigitalPin.prototype.digitalWrite = function(value) {
var _this = this;
if (this.mode !== 'w') {
this._setMode('w');
this.self._setMode('w');
}
this.status = value === 1 ? 'high' : 'low';
return FS.writeFile(this.pinFile, value, function(err) {
if (err) {
console.log('ERROR occurred while writing to the Pin File');
return this.emit('error', "Error occurred while writing value " + value + " to pin " + this.pinNum);
return _this.self.emit('error', "Error occurred while writing value " + value + " to pin " + _this.pinNum);
} else {
console.log('Pin File written successfully');
return this.emit('digitalWrite', value);
return _this.self.emit('digitalWrite', value);
}
});
};
DigitalPin.prototype.digitalRead = function() {
var readData;
var readData,
_this = this;
if (this.mode !== 'r') {
this._setMode('r');
this.self._setMode('r');
}
readData = null;
FS.readFile(this.pinFile, function(err, data) {
if (err) {
console.log('ERROR occurred while reading from the Pin');
return this.emit('error', "Error occurred while reading from pin " + this.pinNum);
return _this.self.emit('error', "Error occurred while reading from pin " + _this.pinNum);
} else {
readData = data;
return this.emit('read', data);
return _this.self.emit('read', data);
}
});
return readData;
};
DigitalPin.prototype._setMode = function(mode) {
var _this = this;
this.mode = mode;
if (this.mode === 'w') {
return FS.writeFile("" + GPIO_PATH + "/gpio" + this.pinNum + "/direction", GPIO_DIRECTION_WRITE, function(err) {
if (!err) {
console.log('Pin mode(direction) setup...');
this.pinFile = "" + GPIO_PATH + "/gpio" + this.pinNum + "/value";
this.ready = true;
return this.emit('open', mode);
_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.emit('error', "Setting up pin direction failed");
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) {
console.log('Pin mode(direction) setup...');
this.pinFile = "" + GPIO_PATH + "/gpio" + this.pinNum + "/value";
this.ready = true;
return this.emit('open', mode);
_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.emit('error', "Setting up pin direction failed");
return _this.self.emit('error', "Setting up pin direction failed");
}
});
}
@ -118,9 +123,9 @@
DigitalPin.prototype.toggle = function() {
if (this.status === 'low') {
return this.digitalWrite(1);
return this.self.digitalWrite(1);
} else {
return this.digitalWrite(0);
return this.self.digitalWrite(0);
}
};
@ -129,4 +134,6 @@
})(EventEmitter);
});
module.exports = Cylon.IO.DigitalPin;
}).call(this);

4
examples/pure_gpio.coffee
View File

@ -1,6 +1,6 @@
require('../dist/digital-pin')
DigitalPin = require('../dist/digital-pin')
pin4 = new Cylon.IO.DigitalPin(pin: 4)
pin4 = new DigitalPin(pin: 4)
pin4.on('create', (data) ->
console.log("Pin files have been created")

44
src/digital-pin.coffee
View File

@ -25,46 +25,47 @@ namespace 'Cylon.IO', ->
LOW = 0
constructor: (opts) ->
@self = this
@pinNum = opts.pin
@status = 'low'
@ready = false
open: (mode) ->
# Creates the GPIO file to read/write from
FS.writeFile("#{ GPIO_PATH }/export", "#{ @pinNum }", (err) ->
FS.writeFile("#{ GPIO_PATH }/export", "#{ @pinNum }", (err) =>
unless(err)
@emit('create')
@_setMode(opts.mode)
@self.emit('create')
@self._setMode(opts.mode)
else
console.log('Error while creating pin files ...')
@emit('error', 'Error while creating pin files')
@self.emit('error', 'Error while creating pin files')
)
digitalWrite: (value) ->
@_setMode('w') unless @mode == 'w'
@self._setMode('w') unless @mode == 'w'
@status = if (value == 1) then 'high' else 'low'
FS.writeFile(@pinFile, value, (err) ->
FS.writeFile(@pinFile, value, (err) =>
if (err)
console.log('ERROR occurred while writing to the Pin File')
@emit('error', "Error occurred while writing value #{ value } to pin #{ @pinNum }")
@self.emit('error', "Error occurred while writing value #{ value } to pin #{ @pinNum }")
else
console.log('Pin File written successfully')
@emit('digitalWrite', value)
@self.emit('digitalWrite', value)
)
digitalRead: ->
@_setMode('r') unless @mode == 'r'
@self._setMode('r') unless @mode == 'r'
readData = null
FS.readFile(@pinFile, (err, data) ->
FS.readFile(@pinFile, (err, data) =>
if err
console.log('ERROR occurred while reading from the Pin')
@emit('error', "Error occurred while reading from pin #{ @pinNum }")
@self.emit('error', "Error occurred while reading from pin #{ @pinNum }")
else
readData = data
@emit('read', data)
@self.emit('read', data)
)
readData
@ -73,30 +74,33 @@ namespace 'Cylon.IO', ->
_setMode: (mode) ->
@mode = mode
if @mode == 'w'
FS.writeFile("#{ GPIO_PATH }/gpio#{ @pinNum }/direction", GPIO_DIRECTION_WRITE, (err) ->
FS.writeFile("#{ GPIO_PATH }/gpio#{ @pinNum }/direction", GPIO_DIRECTION_WRITE, (err) =>
unless (err)
console.log('Pin mode(direction) setup...')
@pinFile = "#{ GPIO_PATH }/gpio#{ @pinNum }/value"
@ready = true
@emit('open', mode)
@self.emit('open', mode)
else
console.log('Error occurred while settingup pin mode(direction)...')
@emit('error', "Setting up pin direction failed")
@self.emit('error', "Setting up pin direction failed")
)
else if mode =='r'
FS.writeFile("#{ GPIO_PATH }/gpio#{ @pinNum }/direction", GPIO_DIRECTION_READ, (err) ->
FS.writeFile("#{ GPIO_PATH }/gpio#{ @pinNum }/direction", GPIO_DIRECTION_READ, (err) =>
unless (err)
console.log('Pin mode(direction) setup...')
@pinFile = "#{ GPIO_PATH }/gpio#{ @pinNum }/value"
@ready = true
@emit('open', mode)
@self.emit('open', mode)
else
console.log('Error occurred while settingup pin mode(direction)...')
@emit('error', "Setting up pin direction failed")
@self.emit('error', "Setting up pin direction failed")
)
toggle: ->
if @status == 'low'
@digitalWrite(1)
@self.digitalWrite(1)
else
@digitalWrite(0)
@self.digitalWrite(0)
module.exports = Cylon.IO.DigitalPin