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https://github.com/ferrous-systems/embedded-trainings-2020.git
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38 lines
1.1 KiB
Rust
38 lines
1.1 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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// NOTE you can use `FnvIndexMap` instead of `LinearMap`; the former may have better
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// lookup performance when the dictionary contains a large number of items but performance is
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// not important for this exercise
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use heapless::{consts, LinearMap};
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use panic_log as _; // the panicking behavior
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#[entry]
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fn main() -> ! {
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dk::init().unwrap();
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// a dictionary with capacity for 2 elements
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let mut dict = LinearMap::<_, _, consts::U2>::new();
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// ^^ capacity; this is a type not a value
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// do some insertions
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dict.insert(b'A', b'*').expect("dictionary full");
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dict.insert(b'B', b'/').expect("dictionary full");
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// do some lookups
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let key = b'A';
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let value = dict[&key]; // the key needs to be passed by reference
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log::info!("{} -> {}", key, value);
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// more readable
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log::info!("{:?} -> {:?}", key as char, value as char);
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// TODO try another insertion
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// TODO try looking up a key not contained in the dictionary
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// TODO try changing the capacity
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dk::exit()
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}
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