This package provides a major mode for editing and rendering WaveJSON files to create timing diagrams using wavedrom.

• wavedrom-cli: https://github.com/wavedrom/cli

• Optional: inkscape to export to PDF

wavedrom is available on MELPA.

To install it via straight with use-package:

(straight-use-package 'use-package)
(use-package wavedrom)

The package comes with sensible default values. However, you can tweak it either with M-x customize-group RET wavedrom RET or with the following Elisp code:

(setq wavedrom-output-format "pdf")
(setq wavedrom-output-directory "~/wavedrom")
;; Faces suitable for dark themes
(set-face-attribute 'wavedrom-font-lock-brackets-face nil :foreground "goldenrod")
(set-face-attribute 'wavedrom-font-lock-punctuation-face nil :foreground "burlywood")

• Create a file with .wjson extension and wavedrom-mode will automatically be enabled next time it is opened.

• Fill the file with valid WaveJSON syntax and every time it is saved the function wavedrom-compile will be executed, updating the output file and its associated buffer. This provides a WYSIWYG-like result similar to the one with the web editor.

• The output file path will be determined from the value of customizable variables wavedrom-output-format and wavedrom-output-directory. For example, if editing the file hello_world.wjson:

  (setq wavedrom-output-format "svg")
  (setq wavedrom-output-directory "~/wavedrom")

  The rendered file will be created at: ~/wavedrom/hello_world.svg

• C-c C-c: wavedrom-compile
• C-c C-p: wavedrom-preview-browser

• verilog-ts-mode: SystemVerilog Tree-sitter mode
• vhdl-ts-mode: VHDL Tree-sitter mode
• verilog-ext: SystemVerilog Extensions
• vhdl-ext: VHDL Extensions
• fpga: FPGA & ASIC Utilities for tools of major vendors and open source
• vunit-mode: Integration of VUnit workflow