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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]
use panic_halt 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)]
mod app {
use super::BigStruct;
use core::mem::MaybeUninit;
#[resources]
struct Resources {
big_struct: &'static mut BigStruct,
}
#[init]
fn init(_: init::Context) -> init::LateResources {
let big_struct = unsafe {
static mut BIG_STRUCT: MaybeUninit<BigStruct> = MaybeUninit::uninit();
// write directly into the static storage
BIG_STRUCT.as_mut_ptr().write(BigStruct::new());
&mut *BIG_STRUCT.as_mut_ptr()
};
init::LateResources {
// assign the reference so we can use the resource
big_struct,
}
}
}
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