global_alloc.rs

#![no_std]
#![no_main]

extern crate alloc;

use alloc::vec::Vec;
use core::panic::PanicInfo;
use cortex_m_rt::entry;
// Linked-List First Fit Heap allocator (feature = "llff")
use embedded_alloc::LlffHeap as Heap;
// Two-Level Segregated Fit Heap allocator (feature = "tlsf")
// use embedded_alloc::TlsfHeap as Heap;

#[global_allocator]
static HEAP: Heap = Heap::empty();

#[entry]
fn main() -> ! {
    // Initialize the allocator BEFORE you use it
    {
        use core::mem::MaybeUninit;
        const HEAP_SIZE: usize = 1024;
        static mut HEAP_MEM: [MaybeUninit<u8>; HEAP_SIZE] = [MaybeUninit::uninit(); HEAP_SIZE];
        unsafe { HEAP.init(HEAP_MEM.as_ptr() as usize, HEAP_SIZE) }
    }

    let mut xs = Vec::new();
    xs.push(1);

    #[allow(clippy::empty_loop)]
    loop { /* .. */ }
}

#[panic_handler]
fn panic(_: &PanicInfo) -> ! {
    loop {}
}