mirror of
https://github.com/ferrous-systems/embedded-trainings-2020.git
synced 2024-05-20 17:28:53 +00:00
34 lines
1,007 B
Rust
34 lines
1,007 B
Rust
|
#![deny(unused_must_use)]
|
||
|
#![no_main]
|
||
|
#![no_std]
|
||
|
|
||
|
use cortex_m_rt::entry;
|
||
|
use heapless::{consts, Vec};
|
||
|
use panic_log as _; // the panicking behavior
|
||
|
|
||
|
#[entry]
|
||
|
fn main() -> ! {
|
||
|
dk::init().unwrap();
|
||
|
|
||
|
// a stack-allocated `Vec` with capacity for 6 bytes
|
||
|
let mut buffer = Vec::<u8, consts::U6>::new();
|
||
|
// ^^ capacity; this is a type not a value
|
||
|
|
||
|
// `heapless::Vec` exposes the same API surface as `std::Vec` but some of its methods return a
|
||
|
// `Result` to indicate whether the operation failed due to the `heapless::Vec` being full
|
||
|
log::info!("start: {:?}", buffer);
|
||
|
|
||
|
buffer.push(0).expect("buffer full");
|
||
|
log::info!("after `push`: {:?}", buffer);
|
||
|
|
||
|
buffer.extend_from_slice(&[1, 2, 3]).expect("buffer full");
|
||
|
log::info!("after `extend`: {:?}", buffer);
|
||
|
|
||
|
// TODO try this operation
|
||
|
// buffer.extend_from_slice(&[4, 5, 6, 7]).expect("buffer full");
|
||
|
|
||
|
// TODO try changing the capacity of the `heapless::Vec`
|
||
|
|
||
|
dk::exit()
|
||
|
}
|