stm32f042 contains the peripheral access API for the STMicro stm32f042 series microcontroller.
The register definitions were created from the collection of CMSIS SVD files at cmsis-svd with the help of svd2rust to generate the Rust code.
This crate is now obsolete! Use stm32f0 instead or have a look at the stm32f042-hal crate for an implementation using that crate.