simonschmidt / svd2zig

Generate Zig API from SVD register definitions.

SVD to Zig

This converts System View Description (SVD) files into Zig, providing a nice API against memory-mapped peripheral registers on embedded systems. It solves the same problem as svd2rust.

The generated Zig code has only been lightly tested on nRF52 hardware as part of my keyboard firmware. It's checked in under target/ so you can just download and run it if you want to get right to playing with nRF52 chips using Zig.

This project was a collaboration with Jamie Brandon, see his writeup on this project.

Usage example

The register API is defined by registers.zig, which is inlined at the top of the generated Zig files.

usingnamespace @import("register-generation/target/nrf52840.zig");

pub const led = .{ .port = p0, .pin = 11 };

fn main() void {

    //calling modify will preserve other fields of register
    led.port.pin_cnf[led.pin].modify(.{
        .dir = .output,
        .input = .disconnect,
    });
    
    //calling write will set unspecified fields to their reset value
    led.port.pin_cnf[led.pin].write(.{
        .dir = .input,
    });
    
}

Generating Zig definitions from SVD

The API and generation script assumes 32-bit word size and likely contains bugs and conceptual misunderstandings. Read the 300 lines of source and decide for yourself. It's written in Clojure because...hahaha I'm not going to try parsing XML in Zig =P

Run ./make.sh to download SVD files to vendor/ and generate formatted Zig definitions for every SVD found in that directory. You'll need clojure and zig on your path.