How to traversal or return the signalName/Direction/type of all elements of a bundle?

Could you enlight me how to traversal the signalName of a bundle? like

class test extends Bundle {
  val io = IO(new Bundle{
    val a = Input(Bool())
    val b = Input(Bool())
  })
  for ( signame <- io.elements) {
    printf("%s \n",signame)
  }
}

[jackkoenig]

You need to iterate on the elements of a, not a itself. Try:

for ((name, d) <- u0.io.a.elements) { ...
}

As for the printf, the type error is because it doesn’t know the type of d (until you make the fix I mentioned above), but you will get an elaboration time error with it as written. Instead try

printf(s"$name <- %d\n", d)

The above is a C-style printf. Alternatively, you could try using our custom String-interpolator which would be simply:

printf(p"$name <- $d\n")

Note how it uses p" instead of s", also that there are no arguments to send after the String. For more information, check out Printing in Chisel

[azidar]

Please reopen if issue was not resolved.