Primitives

The following primitive types are available:

type hint	name
`=bool`	boolean
`={i,u}{8,16,32,64,128,size}`	standard integer types
`=f{32, 64}`	32-bit / 64-bit floating point type
`=[u8; N]`	byte array
`=[u8]`	byte slice
`=str`	string slice

They can be used like this:

#![allow(unused)]
fn main() {
extern crate defmt;
let enabled = false;
let ready = false;
let timeout = false;
// arguments can be compressed into a single byte
defmt::info!(
    "enabled: {=bool}, ready: {=bool}, timeout: {=bool}",
    enabled, ready, timeout,
);

let x = 0u16;
// arguments will be type checked
defmt::trace!("{=u16}", x);
//                      ^ must have type `u16`
}

Additionally there are some special types:

type hint	name
`=M..N`	Bitfields
`=istr`	Interned Strings
`=[?]`	Format slices
`=[?; N]`	Format arrays

Read more about them in the following chapters.

defmt book

Primitives