Build it

The microcontroller in the F3 has a Cortex-M4F processor in it. rustc knows how to cross compileto the Cortex-M architecture and provides 4 different targets that cover the different processorfamilies within that architecture:

You only need to do the above step once; rustup will re-install a new standard library(rust-std component) whenever you update your toolchain.

Next, we’ll flash the program into our microcontroller.