embedded-trainings-2020/beginner/apps/src/bin/radio-puzzle-1.rs

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#![deny(unused_must_use)]
#![no_main]
#![no_std]
use cortex_m_rt::entry;
use dk::ieee802154::{Channel, Packet};
use panic_log as _; // the panicking behavior
const TEN_MS: u32 = 10_000;
#[entry]
fn main() -> ! {
let board = dk::init().unwrap();
let mut radio = board.radio;
let mut timer = board.timer;
// puzzle.hex uses channel 25
radio.set_channel(Channel::_25);
let mut packet = Packet::new();
// first exchange a single packet with the Dongle
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// letter 'A' (uppercase)
let source = 65;
// let source = b'A'; // this is the same as above
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// TODO try other letters
// single letter (byte) packet
packet.copy_from_slice(&[source]);
radio.send(&packet);
if radio.recv_timeout(&mut packet, &mut timer, TEN_MS).is_ok() {
// response should be one byte large
if packet.len() == 1 {
let destination = packet[0];
log::info!("{} -> {}", source, destination);
// or cast to `char` for a more readable output
log::info!("{:?} -> {:?}", source as char, destination as char);
} else {
log::error!("response packet was not a single byte");
dk::exit()
}
} else {
log::error!("no response or response packet was corrupted");
dk::exit()
}
// TODO next do the whole ASCII range [0, 127]
// start small: just 'A' and 'B' at first
// NOTE: `a..=b` means inclusive range; `a` and `b` are included in the range
// `a..b` means open-ended range; `a` is included in the range but `b` isn't
for _source in b'A'..=b'B' {
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// TODO similar procedure as above
}
dk::exit()
}