Install probe-rs as specified here.

Grove moisture sensor plugged in at 3.3V, GND, A0

Build and flash:

• cargo flash --release --chip R7FA4M1AB --target thumbv7em-none-eabihf

Debug:

• build and flash without --release flag
• launch vscode probe-rs debugger with config from .vscode/

Serial:

• 
• pg. 751