rocketchip高级参数化机制--Parameters.alterpartial（13）

joe

class SubSystemConfig extends Config(
  new MyConfig
//    alterPartial{ //类构造中不能使用偏函数
//    case BUSWIDTH => 16 //此处配置不起作用
//    case CHIPNAME => "RISC-V16" //此处配置不起作用
//  }
  // ++
//  new JtagConfig //++
//  new CacheConfig
)
object MainStart {
  def main(args: Array[String]): Unit = {
    implicit val sysconfig = new SubSystemConfig
    val cm2 = new CacheModule()
  }
}

//MyModule.scala
class MyConfig extends Config((v1,v2,v3)=>{
  case BUSWIDTH => 32
  case CHIPNAME => "RISC-V"
})
class MyModule(implicit p: Parameters) {
  val buswidth:Int = p(BUSWIDTH)
  val chipname:String = p(CHIPNAME)
  println(buswidth)
  println(chipname)
}

//CacheModule.scala
case object BUSWIDTH extends Field[Int]
case object CHIPNAME extends Field[String]
case object IDECODERBUSWIDTH extends Field[Int]
class CacheConfig extends Config((site,here,up) => {
  case BUSWIDTH => 64
  case CHIPNAME => "RISC-V64"
  case IDECODERBUSWIDTH => here(CHIPNAME) match {
    case "RISC-V64" => 164
    case _ => 32
  }
})
class CacheModule(implicit p: Parameters){
  val buswidth:Int = p(BUSWIDTH)
  val name = p(CHIPNAME)
  println("CacheModule " + buswidth)
  println("CacheModule " + name)
val mmp = p.alterPartial({
    case BUSWIDTH => 16
    case CHIPNAME => "RISC-V16"
  })
  val mymodule = new MyModule{mmp} //此mmp配置不起作用 ，所以本句其实可以写成 val mymodule = new MyModule
  println("mymodule " + mymodule.buswidth) //32
  println("mymodule " + mymodule.chipname) //RSIC-V
  println(mmp(BUSWIDTH)) //注意此时配置值才会是16
}

joe

val mymodule=new MyModule，在MyModule中println(buswidth)打印的值是默认Paramerters配置值即32