Rust has a thriving embedded ecosystem[1]. You have access to an ever growing number of HALs[2]. There is an embedded operating system written entirely in Rust called Tock [3], and it can run things like OpenSK, an open source security key application. [4]

[1] https://www.rust-lang.org/what/embedded

[2] https://github.com/rust-embedded/embedded-hal

[3] https://www.tockos.org/

[4] https://www.tockos.org/blog/2020/hello-opensk/