6 files changed, 52 insertions, 22 deletions
diff --git a/scala/ace/src/main/scala/com/github/jodersky/ace/Arq.scala b/scala/ace/src/main/scala/com/github/jodersky/ace/protocol/Arq.scala
index 3f8f84d..4a4ed8d 100644
--- a/scala/ace/src/main/scala/com/github/jodersky/ace/Arq.scala
+++ b/scala/ace/src/main/scala/com/github/jodersky/ace/protocol/Arq.scala
@@ -1,4 +1,4 @@
-package com.github.jodersky.ace
+package com.github.jodersky.ace.protocol
 
 import scala.concurrent._
 import scala.concurrent.ExecutionContext.Implicits.global
@@ -19,7 +19,7 @@ class Arq(timeout: Int, maxResends: Int = 5, maxMessageBuffer: Int = 10) extends
   // received message sequences
   private val receivedSequences = Queue[Int]()
 
-  def receive(frameData: Seq[Int]) = {
+  protected def receive(frameData: Seq[Int]) = {
     val sequence = frameData(SequenceOffset)
     val command = frameData(CommandOffset)
     val message = frameData.drop(MessageOffset)
@@ -33,7 +33,7 @@ class Arq(timeout: Int, maxResends: Int = 5, maxMessageBuffer: Int = 10) extends
       }
 
       case Data => {
-        writeToLower(ack(sequence))
+        sendToLower(ack(sequence))
 
         if (!(receivedSequences contains sequence)) {
           if (receivedSequences.size > maxMessageBuffer) receivedSequences.dequeue
@@ -45,14 +45,14 @@ class Arq(timeout: Int, maxResends: Int = 5, maxMessageBuffer: Int = 10) extends
     }
   }
 
-  def write(message: Seq[Int]) = {
+  def send(message: Seq[Int]) = {
     val promise = Promise[Seq[Int]]
     val sequence = nextSequence()
     
     val frameData = Seq(sequence, Data) ++ message 
 
     def send(n: Int): Future[Seq[Int]] =
-      writeToLower(frameData) map { frameData =>
+      sendToLower(frameData) map { frameData =>
         Await.result(promise.future, timeout.milliseconds)
       } recoverWith {
         case t: TimeoutException if (n < maxResends) => send(n + 1)
diff --git a/scala/ace/src/main/scala/com/github/jodersky/ace/Framer.scala b/scala/ace/src/main/scala/com/github/jodersky/ace/protocol/Framer.scala
index 52496e4..5558db3 100644
--- a/scala/ace/src/main/scala/com/github/jodersky/ace/Framer.scala
+++ b/scala/ace/src/main/scala/com/github/jodersky/ace/protocol/Framer.scala
@@ -1,4 +1,4 @@
-package com.github.jodersky.ace
+package com.github.jodersky.ace.protocol
 
 import scala.collection.mutable.ArrayBuffer
 import scala.concurrent.Future
@@ -14,9 +14,9 @@ class Framer extends ReactiveLayer[Seq[Int], Seq[Int]] {
   private var state: State = Waiting
   private val buffer = new ArrayBuffer[Int]
 
-  def receive(bytes: Seq[Int]) = bytes foreach receive
+  protected def receive(bytes: Seq[Int]) = bytes foreach receive
   
-  def receive(byte: Int): Unit = {
+  protected def receive(byte: Int): Unit = {
 
     state match {
       case Escaping => {
@@ -40,7 +40,7 @@ class Framer extends ReactiveLayer[Seq[Int], Seq[Int]] {
     }
   }
 
-  def write(data: Seq[Int]): Future[Seq[Int]] = {
+  def send(data: Seq[Int]): Future[Seq[Int]] = {
     val buffer = new ArrayBuffer[Int]
     
     buffer += Start    
@@ -62,7 +62,7 @@ class Framer extends ReactiveLayer[Seq[Int], Seq[Int]] {
         case _ => buffer += c
       }
     buffer += Stop
-    writeToLower(buffer) map (_ => data)
+    sendToLower(buffer) map (_ => data)
   }
 }
 
@@ -72,9 +72,9 @@ object Framer {
   case object Receiving extends State
   case object Escaping extends State
 
-  final val Escape = 0x02
-  final val Start = 0x03
-  final val Stop = 0x10
+  final val Escape = 0x10
+  final val Start = 0x02
+  final val Stop = 0x03
 
   def checksum(unsignedData: Seq[Int]) = {
     unsignedData.fold(0)(_ ^ _)
diff --git a/scala/ace/src/main/scala/com/github/jodersky/ace/ReactiveLayer.scala b/scala/ace/src/main/scala/com/github/jodersky/ace/protocol/ReactiveLayer.scala
index 663a4a7..c9531c0 100644
--- a/scala/ace/src/main/scala/com/github/jodersky/ace/ReactiveLayer.scala
+++ b/scala/ace/src/main/scala/com/github/jodersky/ace/protocol/ReactiveLayer.scala
@@ -1,4 +1,4 @@
-package com.github.jodersky.ace
+package com.github.jodersky.ace.protocol
 
 import scala.concurrent.Future
 
@@ -15,14 +15,14 @@ trait ReactiveLayer[L, T] {
     case None => throw new UnsupportedOperationException("Higher layer doesn't exist.")
   }
   
-  /** Writes data to a lower layer. */
-  protected def writeToLower(l: L): Future[L] = lowerLayer match {
-    case Some(lower) => lower.write(l)
+  /** Sends data to a lower layer. */
+  protected def sendToLower(l: L): Future[L] = lowerLayer match {
+    case Some(lower) => lower.send(l)
     case None => Future.failed(new UnsupportedOperationException("Lower layer doesn't exist."))
   }
   
   /** Connects this layer with a higher layer, effectively linking calls
-   *  `notifyHigher` to `higher.receive` and `higher.writeToLower` to `write`. */
+   *  `notifyHigher` to `higher.receive` and `higher.sendToLower` to `send`. */
   def connect[A](higher: ReactiveLayer[T, A]) = {
     this.higherLayer = Some(higher)
     higher.lowerLayer = Some(this)
@@ -30,9 +30,9 @@ trait ReactiveLayer[L, T] {
   }
   
   /** Called from lower layer. */
-  def receive(data: L): Unit
+  protected def receive(data: L): Unit
   
-  /** Write data to this layer.
-   *  @return a future value containing the data written, or an error */
-  def write(data: T): Future[T]
+  /** Send data to this layer.
+   *  @return a future value containing the data sent, or an error */
+  def send(data: T): Future[T]
 }
 \ No newline at end of file
diff --git a/scala/ace/src/main/scala/com/github/jodersky/ace/protocol/SimpleActionLayer.scala b/scala/ace/src/main/scala/com/github/jodersky/ace/protocol/SimpleActionLayer.scala
new file mode 100644
index 0000000..81e39cb
--- /dev/null
+++ b/scala/ace/src/main/scala/com/github/jodersky/ace/protocol/SimpleActionLayer.scala
@@ -0,0 +1,8 @@
+package com.github.jodersky.ace.protocol
+
+class SimpleActionLayer[A](action: A => Unit) extends ReactiveLayer[A, A] {
+  protected def receive(data: A) = action(data)
+  
+  def send(data: A) = sendToLower(data)
+
+}
+\ No newline at end of file
diff --git a/scala/ace/src/main/scala/com/github/jodersky/ace/serial/Serial.scala b/scala/ace/src/main/scala/com/github/jodersky/ace/serial/Serial.scala
new file mode 100644
index 0000000..b688ec8
--- /dev/null
+++ b/scala/ace/src/main/scala/com/github/jodersky/ace/serial/Serial.scala
@@ -0,0 +1,15 @@
+package com.github.jodersky.ace.serial
+
+import com.github.jodersky.ace.protocol.ReactiveLayer
+
+trait Serial extends ReactiveLayer[Nothing, Seq[Int]] {
+  protected def receive(nothing: Nothing) = throw new UnsupportedOperationException("A receive function cannot be called on the lowest layer.")
+  
+  def begin(): Unit
+  def close(): Unit
+  
+}
+
+object Serial {
+  def open(port: String, baudRate: Int)(implicit provider: SerialProvider) = provider.open(port, baudRate)
+}
+\ No newline at end of file
diff --git a/scala/ace/src/main/scala/com/github/jodersky/ace/serial/SerialProvider.scala b/scala/ace/src/main/scala/com/github/jodersky/ace/serial/SerialProvider.scala
new file mode 100644
index 0000000..9c7b95c
--- /dev/null
+++ b/scala/ace/src/main/scala/com/github/jodersky/ace/serial/SerialProvider.scala
@@ -0,0 +1,7 @@
+package com.github.jodersky.ace.serial
+
+trait SerialProvider {
+  
+  def open(port: String, baudRate: Int): Serial
+
+}
+\ No newline at end of file