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README
Clash - A functional hardware description language
Clash is a functional hardware description language that borrows both its syntax and semantics from the functional programming language Haskell. The Clash compiler transforms these high-level descriptions to low-level synthesizable VHDL, Verilog, or SystemVerilog.
Features of Clash:
Strongly typed, but with a very high degree of type inference, enabling both safe and fast prototyping using concise descriptions.
Interactive REPL: load your designs in an interpreter and easily test all your component without needing to setup a test bench.
Higher-order functions, with type inference, result in designs that are fully parametric by default.
Synchronous sequential circuit design based on streams of values, called
Signals, lead to natural descriptions of feedback loops.Support for multiple clock domains, with type safe clock domain crossing.
Community
Mailing list: for updates and questions join the mailing list [email protected] or read the forum
Slack: functionalprogramming.slack.com#clash (Invite yourself at fpchat-invite.herokuapp.com).
IRC: libera.chat#clash (webchat access) (or ircs://irc.libera.chat:6697/clash if you want to use a regular IRC client)
Get Clash
Check out clash-lang.org/install to install the latest stable release of Clash, or to setup a Clash project.
Get Clash from source
Get the source code using Git and enter the cloned directory:
git clone [email protected]:clash-lang/clash-compiler.git
# Alternatively, if you haven't setup SSH keys with GitHub:
# git clone https://github.com/clash-lang/clash-compiler.git
cd clash-compiler
To check out a released version, use:
git checkout v1.2.3
To checkout a release branch use:
git checkout 1.2
Note that release branches might contain non-released patches.
GHC compatibility
| Linux | Windows | macOS | |
|---|---|---|---|
| 8.6 | ✔️ | ✔️ | ✔️ |
| 8.8 | ✔️ | ❌ | ✔️ |
| 8.10 | ✔️ | ✔️ | ❌ |
| 9.0 | ✔️ | ✔️ | ✔️ |
| 9.2† | ❌ | ❌ | ❌ |
† GHC 9.2 contains a regression, rendering Clash error messages indecipherable. This change will be reverted in 9.4.
Cabal
To use Cabal you need both Cabal and GHC installed on your system. We recommend using ghcup. For more information, see https://www.haskell.org/downloads/.
To run clash use:
cabal v2-run --write-ghc-environment-files=always -- clash
If this fails, make sure you've got an up-to-date package index:
cabal update
Stack
Install Stack and run:
stack run -- clash
Nix
Or use Nix to get a shell with the clash and clashi binaries on your PATH:
nix-shell
Related libraries and initiatives
- Clashilator: tooling to integrate Clash with Verilator. Enables fast, multithreaded simulation by compiling Clash designs to C++.
- Clash Protocols: experimental library for writing Clash circuits with bidirectional communication - such as AXI or Avalon.
- Clash Starters: starter projects to quickly get you up and running.
- Clash WaveDrom: generate wave diagrams from Clash using WaveDrom
Projects built with Clash
- Contranomy: a RISCV implementation verified using the RISC-V Formal Verification Framework.
- Space Invaders: a Clash implementation of the 1978 Space Invaders arcade machine by Taito.