rtic/examples/async.rs
Jorge Aparicio 0cc456ba80 reduce memory overhead
by storing indices (u8) in the queues instead of pointers (*mut u8)

in the binary heap we store the baseline inline along with the index and the task name. Before we
stored a pointer to the message and had to lookup the baseline when comparing two nodes in the heap.
2018-05-04 10:59:23 +02:00

59 lines
873 B
Rust

// # Pointers (old)
//
// ~40~ 32 bytes .bss
//
// # Indices (new)
//
// 12 bytes .bss
#![deny(unsafe_code)]
#![deny(warnings)]
#![feature(proc_macro)]
#![no_std]
extern crate cortex_m;
extern crate cortex_m_rtfm as rtfm;
extern crate panic_abort;
extern crate stm32f103xx;
use cortex_m::asm;
use rtfm::app;
app! {
device: stm32f103xx,
init: {
async: [a],
},
free_interrupts: [EXTI1],
tasks: {
exti0: {
interrupt: EXTI0,
async: [a],
},
a: {},
},
}
#[inline(always)]
fn init(_ctxt: init::Context) -> init::LateResources {
init::LateResources {}
}
#[inline(always)]
fn idle(_ctxt: idle::Context) -> ! {
loop {
asm::wfi();
}
}
fn exti0(mut ctxt: exti0::Context) {
ctxt.async.a.post(&mut ctxt.threshold, ()).ok();
}
fn a(_ctxt: a::Context) {
asm::bkpt();
}