Sets up power and clocks and blinks an led (LD1) on the stm32h735g-dk using the async embassy runtime.
The stm32h735g-dk uses an external oscillator so the default clock and power settings for embassy won't to.
Install probe-rs
from here: https://probe.rs/
Install the Arm cross compiler
rustup target add thumbv7em-none-eabihf
cargo run --release