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Refactor GPIO file paths, added validation to check for existance of GPIO pins (they have already been setup), added new sync disconnect.

This commit is contained in:
Edgar O Silva 2013-11-11 13:34:43 -06:00
parent 0b02822f6a
commit 9798fba74f
1 changed files with 46 additions and 20 deletions
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66
src/digital-pin.coffee
View File

@ -33,31 +33,43 @@ namespace 'Cylon.IO', ->
connect: (mode = null) ->
@mode ?= mode
# Creates the GPIO file to read/write from
FS.writeFile("#{ GPIO_PATH }/export", "#{ @pinNum }", (err) =>
if(err)
@self.emit('error', 'Error while creating pin files')
else
@self._setMode(@mode, true)
@self.emit('open')
# Check if the pin acceess file is already in the GPIO folder
FS.exists(@_pinPath(), (exists) =>
unless exists
# Creates the GPIO file to read/write from
FS.writeFile(@_exportPath(), "#{ @pinNum }", (err) =>
if(err)
@self.emit('error', 'Error while creating pin files')
else
@self._setMode(@mode, true)
@self.emit('open')
)
)
close: ->
FS.writeFile("#{ GPIO_PATH }/unexport", "#{ @pinNum }", (err) =>
if(err)
console.log("EROR WHILE WRITING TO UNEXPORT FILE!!!")
@self.emit('error', 'Error while closing pin files')
else
console.log("PIN SHOULD BE UNEXPORTED")
@self.emit('close')
FS.writeFile(@unexportPath(), "#{ @pinNum }", (err) =>
@_closeCallback()
)
closeSync: ->
FS.writeFileSync("#{ GPIO_PATH }/unexport", "#{ @pinNum }", (err) =>
@_closeCallback()
)
_closeCallback: (err) ->
if(err)
console.log("EROR WHILE WRITING TO UNEXPORT FILE!!!")
@self.emit('error', 'Error while closing pin files')
else
console.log("PIN SHOULD BE UNEXPORTED")
@self.emit('close')
digitalWrite: (value) ->
@self._setMode('w') unless @mode == 'w'
@status = if (value == 1) then 'high' else 'low'
FS.writeFile(@pinFile, value, (err) =>
FS.writeFile(@valueFile, value, (err) =>
if (err)
@self.emit('error', "Error occurred while writing value #{ value } to pin #{ @pinNum }")
else
@ -69,7 +81,7 @@ namespace 'Cylon.IO', ->
readData = null
setInterval(() =>
FS.readFile(@pinFile, (err, data) =>
FS.readFile(@valueFile, (err, data) =>
if err
@self.emit('error', "Error occurred while reading from pin #{ @pinNum }")
else
@ -81,23 +93,37 @@ namespace 'Cylon.IO', ->
# Sets the mode for the GPIO pin by writing the correct values to the pin reference files
_setMode: (mode, emitConnect = false) ->
if mode == 'w'
FS.writeFile("#{ GPIO_PATH }/gpio#{ @pinNum }/direction", GPIO_DIRECTION_WRITE, (err) =>
FS.writeFile(@_directionPath(), GPIO_DIRECTION_WRITE, (err) =>
if (err)
@self.emit('error', "Setting up pin direction failed")
else
@pinFile = "#{ GPIO_PATH }/gpio#{ @pinNum }/value"
@ready = true
@self.emit('connect', mode) if emitConnect
)
else if mode =='r'
FS.writeFile("#{ GPIO_PATH }/gpio#{ @pinNum }/direction", GPIO_DIRECTION_READ, (err) =>
FS.writeFile(@_directionPath(), GPIO_DIRECTION_READ, (err) =>
if (err)
@self.emit('error', "Setting up pin direction failed")
else
@pinFile = "#{ GPIO_PATH }/gpio#{ @pinNum }/value"
@ready = true
@self.emit('connect', mode) if emitConnect
)
@valueFile = @_valuePath()
_directionPath: () ->
"#{ @pinPath }/direction"
_valuePath: () ->
"#{ @pinPath }/value"
_pinPath: () ->
"#{ GPIO_PATH }/gpio#{ @pinNum }"
_exportPath: () ->
"#{ GPIO_PATH }/export"
_unexportPath: () ->
"#{ GPIO_PATH }/unexport"
setHigh: ->
@self.digitalWrite(1)