Clean up tx and rx logic; small saving in LC count
Clean up tx and rx logic; small saving in LC count

RGD2/swapforth,jamesbowman/swapforth,uho/swapforth,uho/swapforth,zuloloxi/swapforth,jamesbowman/swapforth,uho/swapforth,zuloloxi/swapforth,RGD2/swapforth,zuloloxi/swapforth,RGD2/swapforth,uho/swapforth,zuloloxi/swapforth,jamesbowman/swapforth,RGD2/swapforth,jamesbowman/swapforth