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Uart encoder

// Fork a simulation process which will get chars typed into the simulation
// terminal and transmit them on the simulation uartPin.
fork {
  uartPin #= true
  while(true) {
    // System.in is the java equivalent of the C's stdin.
    if(System.in.available() != 0) {
      val buffer = System.in.read()
      uartPin #= false
      sleep(baudPeriod)

      for(bitId <- 0 to 7) {
        uartPin #= ((buffer >> bitId) & 1) != 0
        sleep(baudPeriod)
      }

      uartPin #= true
      sleep(baudPeriod)
    } else {
      // Sleep a little while to avoid polling System.in too often.
      sleep(baudPeriod * 10)
    }
  }
}