about Bundle constructor

[Hauk Li]

Hi all,

 

I just begin to learn chisel, and not understand the "view_arg" in Bundle's constructor.  as in  the source code:

 

class Bundle(view_arg: Seq[String] = null)

---------------------------------------------------------

 

the older example like this doesn't work:

 

class MyFloat extends Bundle {
val sign = Bool()
val exponent = Bits(width = 8)
val significand = Bits(width = 23)
}

 

while the modified version pass the compilation:

 

class MyFloat extends Bundle(null) {
val sign = Bool()
val exponent = Bits(width = 8)
val significand = Bits(width = 23)
}

 

any help will be appreciated!

 

[Jonathan Bachrach]

bundle's view_arg is deprecated.

you shouldn't need it.

none of our code uses it (e.g., ChiselUtils.scala etc)

in other words, the first version of MyFloat should work.

what version of scala are you using?

what scala compiler settings are you using?

would you please send a backtrace?

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[Hauk Li]

i use eclipse with scala ide plugin, the scala version is 2.10.0

before create my scala project i use sbt to build a chisel library, and ref it in the project

 

the ide just complain a syntax error:

"not enough arguments for constructor Bundle: (view_arg: Seq[String])Chisel.Bundle"

 

 

[Sebastien Mirolo]

Hi Hauk,

I think your problem is related to a scala version mismatch. When you use sbt, Chisel is compiled with scala-2.9.X at this point.

I have been able to reproduce your problem by running the following commands:

$ cd chisel

$ sbt package

$ cat src/test/scala/Example.scala

import Chisel._

class MyFloat extends Bundle {

val sign = Bool()

val exponent = Bits(width = 8)

val significand = Bits(width = 23)

}

$ scalac-2.9 -cp target/scala-2.9.1/chisel_2.9.1-1.1-SNAPSHOT.jar src/test/scala/Example.scala

$ ls *.class

MyFloat.class

$ rm MyFloat.class

$ scalac-2.10 -cp target/scala-2.9.1/chisel_2.9.1-1.1-SNAPSHOT.jar src/test/scala/Example.scala

src/test/scala/Example.scala:3: error: not enough arguments for constructor Bundle: (view_arg: Seq[String])Chisel.Bundle

class MyFloat extends Bundle {

              ^

one error found

I suggest you stick with scala-2.9 for a while when using Chisel (if possible). In the meantime we will investigate if it is a class binary format mismatch between scala-2.9 and scala-2.10 or just that the scala compiler became a lot more strict about default parameters. Either way I will let you know as soon as we have an estimate of when a scala-2.10 Chisel version will be available.

Thank you very much for this bug report,

Sebastien.

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[Hauk Li]

Thanks a lot!

 

I will try to rewrite one of my fpga design, with chisel, to implement an interface between fpga and stm32 mcu, expect surprise...