Zephyr on WebAssembly

Upstream Zephyr samples, built unmodified for a board whose CPU is WebAssembly, running in this tab: no emulator and nothing to install. The kernel runs freestanding in one wasm32 linear memory; this page is the SoC around it.

Pick a build and press Run. Where a build reads the keyboard, click the output first, then type; Ctrl+C goes to the guest. A build with a display takes clicks, drags and keys on the display itself. Pause the kernel and you can step it forward one stop at a time — a context switch, or waking from idle — and back again. A build that just runs to its end does so on a virtual clock, as fast as it can. One that runs on its own in real time has a speed control, remembered for each build, which changes how fast it goes and not what it does; one that waits for you keeps to your time. Choosing another build stops the one running. A build with a lesson shows it above the output, one step at a time. Press the build's name (or Ctrl+K) to choose another: every build by category, with a search box and links to each sample's source and documentation. Under the output, Hardware lists the devices the build has, from its own devicetree. The address follows the build, and a lesson's step, so it can be copied to share.