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https://github.com/ferrous-systems/embedded-trainings-2020.git
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35 lines
1 KiB
Rust
35 lines
1 KiB
Rust
#![deny(unused_must_use)]
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#![no_main]
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#![no_std]
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use cortex_m_rt::entry;
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use heapless::Vec;
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// this imports `beginner/apps/lib.rs` to retrieve our global logger + panicking-behavior
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use firmware as _;
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#[entry]
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fn main() -> ! {
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dk::init().unwrap();
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// a stack-allocated `Vec` with capacity for 6 bytes
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let mut buffer = Vec::<u8, 6>::new();
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// content type ^^ ^ capacity
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// `heapless::Vec` exposes the same API surface as `std::Vec` but some of its methods return a
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// `Result` to indicate whether the operation failed due to the `heapless::Vec` being full
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defmt::println!("start: {:?}", buffer);
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buffer.push(0).expect("buffer full");
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defmt::println!("after `push`: {:?}", buffer);
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buffer.extend_from_slice(&[1, 2, 3]).expect("buffer full");
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defmt::println!("after `extend`: {:?}", &buffer);
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// TODO try this operation
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// buffer.extend_from_slice(&[4, 5, 6, 7]).expect("buffer full");
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// TODO try changing the capacity of the `heapless::Vec`
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dk::exit()
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}
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