learn-fpga VS rust-wasm

I've followed this tutorial recently, and it's amazing:

https://github.com/BrunoLevy/learn-fpga/blob/master/FemtoRV/...

The author includes detailed instruction for how to build a micro-controller in Verilog on an icestick, starting from a very simple blinker all the way to a functional RISC-V core.

My other suggestion would be: for most of the toolchain, skip your package manager and directly install the binary artifacts published on this Github repo:

https://github.com/YosysHQ/oss-cad-suite-build

You'll spare yourself a world of pain.

You might want to look at https://github.com/BrunoLevy/learn-fpga

Lattice Icestick is pretty cheap and has just enough LUTs to run a small riscv. Also check out https://github.com/BrunoLevy/learn-fpga

Thanks Bruno Levy

These are good starting points: https://github.com/BrunoLevy/learn-fpga/ and, from there, https://github.com/BrunoLevy/learn-fpga/blob/master/FemtoRV/README.md.

The best point-of-entry for "tiny" MCUs these days is FemtoRV32-Quark or SERV. I also maintain my own small RISC-V core (Minimax), though it's early on in graduating from "experiment" to "real design".

Rust blinky on RISC-V soft core If you were looking for, an introduction example of an embedded Rust program, running on a RISC-V soft core, check out this blinky that is using the FemtoRV .

Nope - that's all there is.

It's possible to be incredibly expressive in Verilog and VHDL. This implementation is written in VHDL, which has an outdated reputation for being long-winded.

Also worth a look: FemtoRV32 Quark [0], which is written in Verilog.

[0]: https://github.com/BrunoLevy/learn-fpga/blob/master/FemtoRV/...

It is a lot, but not quite 1000, yet. From https://webassembly.github.io/spec/core/appendix/index-instr... I see 436 instructions including SIMD which is over half the population. If I filtered it correctly, it looks like there are about 203 instructions in Wasm without SIMD. Many of those are not necessary for most programs.

There at least three small Wasm interpreters in Rust

4kloc https://github.com/yblein/rust-wasm

3kloc https://github.com/k-nasa/wai

500loc https://github.com/rustwasm/wasm-bindgen/tree/HEAD/crates/wa...

This list has 169 Wasm instructions https://github.com/rolfrm/wasm-lisp/blob/master/instruction....

Wirth's RISC is neat, I'd love to re-do it in RISC-V (only 47 instructions in the base ISA). UM, Chifir and UXN look like Art (not pejorative), I'll definitely read the Chifir paper. They would be great systems to run on top of Wasm.

https://git.sr.ht/~bctnry/chifir

One might be able squeeze a Chifir VM into an ESP-32 (with external PSRAM).