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|
//! examples/big-struct-opt.rs
//!
//! Example on how to initialize a large struct without needing to copy it via `LateResources`,
//! effectively saving stack space needed for the copies.
#![no_main]
#![no_std]
#![feature(type_alias_impl_trait)]
use panic_semihosting as _;
/// Some big struct
pub struct BigStruct {
/// Big content
pub data: [u8; 2048],
}
impl BigStruct {
fn new() -> Self {
BigStruct { data: [22; 2048] }
}
}
#[rtic::app(device = lm3s6965, dispatchers = [SSI0])]
mod app {
use super::BigStruct;
use core::mem::MaybeUninit;
use cortex_m_semihosting::{debug, hprintln};
use lm3s6965::Interrupt;
#[shared]
struct Shared {
big_struct: &'static mut BigStruct,
}
#[local]
struct Local {}
#[init(local = [bs: MaybeUninit<BigStruct> = MaybeUninit::uninit()])]
fn init(cx: init::Context) -> (Shared, Local) {
let big_struct = unsafe {
// write directly into the static storage
cx.local.bs.as_mut_ptr().write(BigStruct::new());
&mut *cx.local.bs.as_mut_ptr()
};
rtic::pend(Interrupt::UART0);
async_task::spawn().unwrap();
(
Shared {
// assign the reference so we can use the resource
big_struct,
},
Local {},
)
}
#[idle]
fn idle(_: idle::Context) -> ! {
loop {
hprintln!("idle");
debug::exit(debug::EXIT_SUCCESS);
}
}
#[task(binds = UART0, shared = [big_struct])]
fn uart0(mut cx: uart0::Context) {
cx.shared
.big_struct
.lock(|b| hprintln!("uart0 data:{:?}", &b.data[0..5]).unwrap());
}
#[task(shared = [big_struct], priority = 2)]
async fn async_task(mut cx: async_task::Context) {
cx.shared
.big_struct
.lock(|b| hprintln!("async_task data:{:?}", &b.data[0..5]).unwrap());
}
}
|
