defmt-stdout

Forwards defmt frames to the standard output to make it usable on Linux desktops.

Requirements

.cargo/config.toml

[build]
target = "x86_64-unknown-linux-gnu" # or -musl

[target.x86_64-unknown-linux-gnu]
rustflags = [
  "-C", "relocation-model=static",
  "-C", "link-arg=-T/usr/lib/x86_64-linux-gnu/ldscripts/elf_x86_64.x",
  "-C", "link-arg=-Tdefmt.x"
]
linker = "gcc"
runner = "./runner.sh"

[target.x86_64-unknown-linux-musl]
rustflags = [
  "-C", "relocation-model=static",
  "-C", "link-arg=-T/usr/lib/x86_64-linux-gnu/ldscripts/elf_x86_64.x",
  "-C", "link-arg=-Tdefmt.x"
]
runner = "./runner.sh"

[env]
DEFMT_LOG = "trace"

runner.sh

#!/bin/sh
$@ | defmt-print -e $1

chmod +x runner.sh

This way cargo run will be automatically piped into defmt-print

main.rs

use defmt_stdout as _;

References

See the discussion here and here and the defmt-serial project