Microcontrollers

The cortex_m_rt crate provides (among other things) a reset handler for Cortex M microcontrollers.

#![no_main]
#![no_std]
extern crate panic_halt as _;
mod interrupts;
use cortex_m_rt::entry;
#[entry]
fn main() -> ! {
    loop {}
}

Next we’ll look at how to access peripherals, with increasing levels of abstraction.

• The cortex_m_rt::entry macro requires that the function have type fn() -> !, because returning to the reset handler doesn’t make sense.
• Run the example with cargo embed --bin minimal