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Spinal can’t clone class

Introduction

This error happen when SpinalHDL want to create a new datatype via the cloneOf feature but isn’t able to do it. The reasons of this is nearly always because it can retreive the construction parameters of Bundle.

Example

The following code :

//cloneOf(this) isn't able to retreive the width value that was used to construct itself
class RGB(width : Int) extends Bundle{
  val r,g,b = UInt(width bits)
}

class TopLevel extends Component {
  val tmp = Stream(new RGB(8)) //Stream require the capability to cloneOf(new RGB(8))
}

will throw :

*** Spinal can't clone class spinal.tester.PlayDevMessages$RGB datatype
*** You have two way to solve that :
*** In place to declare a "class Bundle(args){}", create a "case class Bundle(args){}"
*** Or override by your self the bundle clone function
  ***
  Source file location of the RGB class definition via the stack trace
  ***

A fix could be :

case class RGB(width : Int) extends Bundle{
  val r,g,b = UInt(width bits)
}

class TopLevel extends Component {
  val tmp = Stream(RGB(8))
}