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//! examples/late.rs
#![deny(unsafe_code)]
#![deny(warnings)]
#![no_main]
#![no_std]
use cortex_m_semihosting::{debug, hprintln};
use heapless::{
consts::*,
spsc::{Consumer, Producer, Queue},
};
use lm3s6965::Interrupt;
use panic_semihosting as _;
#[rtfm::app(device = lm3s6965)]
const APP: () = {
// Late resources
struct Resources {
p: Producer<'static, u32, U4>,
c: Consumer<'static, u32, U4>,
}
#[init]
fn init(_: init::Context) -> init::LateResources {
// NOTE: we use `Option` here to work around the lack of
// a stable `const` constructor
static mut Q: Option<Queue<u32, U4>> = None;
*Q = Some(Queue::new());
let (p, c) = Q.as_mut().unwrap().split();
// Initialization of late resources
init::LateResources { p, c }
}
#[idle(resources = [c])]
fn idle(c: idle::Context) -> ! {
loop {
if let Some(byte) = c.resources.c.dequeue() {
hprintln!("received message: {}", byte).unwrap();
debug::exit(debug::EXIT_SUCCESS);
} else {
rtfm::pend(Interrupt::UART0);
}
}
}
#[task(binds = UART0, resources = [p])]
fn uart0(c: uart0::Context) {
c.resources.p.enqueue(42).unwrap();
}
};
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