To program your microcontroller, you need to install:

• gdb-multiarch (on some platforms you may need to use gdb-arm-none-eabi instead, make sure to update .cargo/config to reflect this change)

Finally, you need to install arm target support for the Rust compiler. To do so, run

rustup target install thumbv7m-none-eabi

Using a CP2102 (3.3v logic) or another USB-Serial converter, connect its TX to pin A10 and its RX to pin A9. Also connect 3.3v from the CP2102 to the 3.3v pin on the STM32, and do the same for ground. If you try to power the STM32 from its USB port without this power connection, it won't work.

cargo build will create an ARM ELF file, but we need it in a binary .bin format.

cargo install cargo-binutils
rustup component add llvm-tools-preview

cargo objcopy --release -- -O binary firmware.bin