71 lines
1.3 KiB
Rust
71 lines
1.3 KiB
Rust
//! How to use the heap and a dynamic memory allocator
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//!
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//! This example depends on the alloc-cortex-m crate so you'll have to add it to your Cargo.toml:
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//!
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//! ``` text
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//! # or edit the Cargo.toml file manually
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//! $ cargo add alloc-cortex-m
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//! ```
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//!
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//! ---
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#![feature(alloc)]
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#![feature(global_allocator)]
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#![no_main]
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#![no_std]
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// This is the allocator crate; you can use a different one
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extern crate alloc_cortex_m;
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#[macro_use]
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extern crate alloc;
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extern crate cortex_m;
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#[macro_use]
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extern crate cortex_m_rt as rt;
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extern crate cortex_m_semihosting as sh;
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extern crate panic_abort;
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use core::fmt::Write;
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use alloc_cortex_m::CortexMHeap;
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use cortex_m::asm;
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use rt::ExceptionFrame;
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use sh::hio;
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#[global_allocator]
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static ALLOCATOR: CortexMHeap = CortexMHeap::empty();
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const HEAP_SIZE: usize = 1024; // in bytes
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main!(main);
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fn main() -> ! {
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// Initialize the allocator
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unsafe { ALLOCATOR.init(rt::heap_start() as usize, HEAP_SIZE) }
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// Growable array allocated on the heap
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let xs = vec![0, 1, 2];
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let mut stdout = hio::hstdout().unwrap();
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writeln!(stdout, "{:?}", xs).unwrap();
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loop {}
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}
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exception!(DefaultHandler, dh);
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#[inline(always)]
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fn dh(_nr: u8) {
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asm::bkpt();
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}
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exception!(HardFault, hf);
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#[inline(always)]
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fn hf(_ef: &ExceptionFrame) -> ! {
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asm::bkpt();
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loop {}
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}
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interrupts!(DefaultHandler);
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