mirror of
https://github.com/ferrous-systems/embedded-trainings-2020.git
synced 2024-05-28 13:18:15 +00:00
b99f217b25
- removed 'in their value' from text - elaborate a bit more on the type level diff between `[b'H', b'i']` and `b"Hi"` - note that not being fully 802.15.4 compliant is not an issue for the workshop exercises - use `b'A'` syntax in hints now that it has been covered early on - use large enough capacity in hints - for consistency, set channel first thing in all hints
34 lines
819 B
Rust
34 lines
819 B
Rust
#![deny(unused_must_use)]
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#![no_main]
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#![no_std]
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use core::str;
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use cortex_m_rt::entry;
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use heapless::{consts, Vec};
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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 buffer with capacity for 2 bytes
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let mut buffer = Vec::<u8, 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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buffer.push(b'H').expect("buffer full");
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buffer.push(b'i').expect("buffer full");
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// look into the contents so far
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log::info!("{:?}", buffer);
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// or more readable
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// NOTE as long as you only push bytes in the ASCII range (0..=127) the conversion should work
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log::info!(
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"{}",
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str::from_utf8(&buffer).expect("content was not UTF-8")
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);
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dk::exit()
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}
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