You've done the Chisel tutorials, and now you are ready to start your own chisel project. The following procedure should get you started with a clean running Chisel3 project.
More and more users are finding IntelliJ to be a powerful tool for Chisel coding. See the IntelliJ Installation Guide for how to install it.
The first thing you want to do is clone this repo into a directory of your own. I'd recommend creating a chisel projects directory somewhere
mkdir ~/ChiselProjects
cd ~/ChiselProjects
git clone https://github.com/ucb-bar/chisel-template.git MyChiselProject
cd MyChiselProjectThere may be more elegant way to do it, but the following works for me. Note: this project comes with a magnificent 339 line (at this writing) .gitignore file. You may want to edit that first in case we missed something, whack away at it, or start it from scratch.
rm -rf .git
git init
git add .gitignore *Use your favorite text editor to change the first line of the build.sbt file
(it ships as name := "chisel-module-template") to correspond
to your project.
Perhaps as name := "my-chisel-project"
Again use you editor of choice to make the README specific to your project. Be sure to update (or delete) the License section and add a LICENSE file of your own.
git commit -m 'Starting MyChiselProject'
Connecting this up to github or some other remote host is an exercise left to the reader.
You should now have a project based on Chisel3 that can be run.
So go for it, at the command line in the project root.
sbt 'testOnly gcd.GCDTester -- -z Basic'This tells the test harness to only run the test in GCDTester that contains the word Basic There are a number of other examples of ways to run tests in there, but we just want to see that one works.
You should see a whole bunch of output that ends with something like the following lines
[info] [0.001] SEED 1540570744913
test GCD Success: 168 tests passed in 1107 cycles in 0.067751 seconds 16339.24 Hz
[info] [0.050] RAN 1102 CYCLES PASSED
[info] GCDTester:
[info] GCD
[info] Basic test using Driver.execute
[info] - should be used as an alternative way to run specification
[info] using --backend-name verilator
[info] running with --is-verbose
[info] running with --generate-vcd-output on
[info] running with --generate-vcd-output off
[info] ScalaTest
[info] Run completed in 3 seconds, 184 milliseconds.
[info] Total number of tests run: 1
[info] Suites: completed 1, aborted 0
[info] Tests: succeeded 1, failed 0, canceled 0, ignored 0, pending 0
[info] All tests passed.
[info] Passed: Total 1, Failed 0, Errors 0, Passed 1
[success] Total time: 5 s, completed Oct 26, 2018 9:19:07 AM
If you see the above then...
You are ready to go. We have a few recommended practices and things to do.
- Use packages and following conventions for structure and naming
- Package names should be clearly reflected in the testing hierarchy
- Build tests for all your work.
- This template includes a dependency on the Chisel3 IOTesters, this is a reasonable starting point for most tests
- You can remove this dependency in the build.sbt file if necessary
- Change the name of your project in the build.sbt file
- Change your README.md
There are instructions for generating Verilog on the Chisel wiki.
Some backends (verilator for example) produce VCD files by default, while other backends (firrtl and treadle) do not.
You can control the generation of VCD files with the --generate-vcd-output flag.
To run the simulation and generate a VCD output file regardless of the backend:
sbt 'test:runMain gcd.GCDMain --generate-vcd-output on'To run the simulation and suppress the generation of a VCD output file:
sbt 'test:runMain gcd.GCDMain --generate-vcd-output off'This is the release version of chisel-template. If you have bug fixes or changes you would like to see incorporated in this repo, please checkout the master branch and submit pull requests against it.
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