Building an Embedded Program

The default in a Cargo project is to compile for the host (native compilation). The beginner/apps project has been configured for cross compilation to the ARM Cortex-M4 architecture. This configuration can be seen in the Cargo configuration file (.cargo/config):

# .cargo/config
target = "thumbv7em-none-eabihf" # = ARM Cortex-M4

✅ Inside the folder beginner/apps, use the following command to cross compile the program to the ARM Cortex-M4 architecture.

$ cargo build --bin hello

The output of the compilation process will be an ELF (Executable and Linkable Format) file. The file will be placed in the target/thumbv7em-none-eabihf directory.

✅ Run $ file target/thumbv7em-none-eabihf/debug/hello and compare if your output is as expected.

Expected output:

$ file target/thumbv7em-none-eabihf/debug/hello
hello: ELF 32-bit LSB executable, ARM, EABI5 version 1 (SYSV), statically linked, with debug_info, not stripped