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package com.github.jodersky.ace.protocol
import scala.concurrent._
import scala.concurrent.ExecutionContext.Implicits.global
import jssc.SerialPort
import java.io.IOException
import jssc.SerialPortEvent
import jssc.SerialPortEventListener
class PhysicalLayer(serial: SerialPort) extends ReactiveLayer[Nothing, Array[Byte]] {
def receive(nothing: Nothing) = throw new UnsupportedOperationException("A receive function cannot be called on the lowest layer.")
private val listener = new SerialPortEventListener {
override def serialEvent(event: SerialPortEvent) = {
if (event.isRXCHAR()) {
val bytes = serial.readBytes
if (bytes != null) notifyHigher(bytes)
}
}
}
def write(data: Array[Byte]) = future {
serial.writeBytes(data)
} map { success =>
if (success) data
else throw new IOException("Could not write to serial port.")
}
def begin() = {
val mask = SerialPort.MASK_RXCHAR + SerialPort.MASK_CTS + SerialPort.MASK_DSR
serial.setEventsMask(mask)
serial.addEventListener(listener)
}
}
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