We recommend LTS releases Java 8 and Java 11. You can install the JDK as recommended by your operating system, or use the prebuilt binaries from AdoptOpenJDK.

SBT is the most common built tool in the Scala community. You can download it here.
mill is another Scala/Java build tool without obscure DSL like SBT. You can download it here

$ git clone https://github.com/Kian75/Chisel_Examples.git
$ cd Chisel_Examples

You can run the main code with:

$ sbt run

or:

$ make

You can run the included test with:

$ sbt test

You should see a whole bunch of output that ends with something like the following lines

[info] Tests: succeeded 1, failed 0, canceled 0, ignored 0, pending 0
[info] All tests passed.
[success] Total time: 5 s, completed Dec 16, 2020 12:18:44 PM

If you want to write your own code and extend this repo, you can go to src/main/scala/simple and add your code. If you want to add your test code you can go to src/test/scala/simple and add your code. Then you can edit the makefile. The procedure is very easy and can be done like the simple ALU code that I have in this repo.

https://github.com/schoeberl/chisel-examples.git

https://github.com/ucb-bar/riscv-mini.git

Lots of things I have learned about Chisel comes from above repsitories