Compiling chisel source files in chisel project template

Question

I'm new to chisel. Currently I'm following chisel-tutorial wiki using chisel3. After cloning the chisel project template linked there, I tried to test and generate verilog output from GCD.scala source file. I got the following error.

> run --v
java.lang.RuntimeException: No main class detected.
    at scala.sys.package$.error(package.scala:27)
[trace] Stack trace suppressed: run last compile:run for the full output.
[error] (compile:run) No main class detected.
[error] Total time: 0 s, completed Dec 1, 2016 12:28:46 AM

So following a solution I found on a mailing list (to this same problem) I inserted the following code block at the end of GCD.scala file

object GCDMain {
def main(args: Array[String]): Unit = {
    chiselMainTest(Array[String]("--backend", "c", "--genHarness"),
        () => Module(new GCD())){c => new GCDTests(c)}
}
}

But I still get the same error. (I added the GCDTests class too)

Community · Accepted Answer · 2017-05-23 11:53:05Z

1

In moving from Chisel 2 to Chisel 3, the developers of Chisel made the decision to promote ScalaTest-style testing of Chisel designs. The chisel-template repo provides a test that can be run with the command sbt test (for more information on testing with sbt, see http://www.scala-sbt.org/0.13/docs/Testing.html). Running this command will generate Verilog and run some execution-driven tests to show that the example code works.

The GCDMain you found in the mailing list would have worked in Chisel 2 but will not work for Chisel 3. If you just want to Verilog and not run any tests, please see Is there a simple example of how to generate verilog from Chisel3 module?.

edited May 23, 2017 at 11:53

CommunityBot

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answered Dec 1, 2016 at 7:49

Jack Koenig

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5 Comments

isururathnayaka Over a year ago

Thanks jkoenig. I'll try this

isururathnayaka Over a year ago

Sorry if this is a noob question. I ran sbt test from base directory and got an error. I searched both this site and mailing list. But couldn't find a solution. BTW sbt test runs fine in the chisel-tutorial directory. It gives the error only in the template repo. I'll post part of the error output since it is too long. [error] /home/isuru/fyp/ChiselProjects/TrialProject/src/test/scala/examples/GCD.scala:6: not found: type GCD [error] class GCDTests(c: GCD) extends PeekPokeTester(c) {

Jack Koenig Over a year ago

Just as a sanity check, are you using the chisel-tutorial or the chisel-template repo? As far as I can tell class GCDTests is not present in the chisel-template, but is present in the chisel-tutorial.

isururathnayaka Over a year ago

I used chisel-tutorial when I was following the wiki. Now I'm using the chisel-template repo. I copied GCDTests file to the repo hoping to use it as the testbench for GCD, since I used that when I tested GCD in the chisel-tutorial.

Jack Koenig Over a year ago

Okay I see now, so the problem is that in the chisel-tutorial, both GCD and GCDTester are in package examples so the tester can easily find it. In chisel-template, GCD is located in package example (note the lack of s), so at the top of the file containing GCD.scala, try adding import example.GCD

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