Remove unused heap allocator

.cargo/config.toml

@@ -14,4 +14,4 @@ rustflags = [
 target = "xtensa-esp32-none-elf"
 
 [unstable]
-build-std = ["alloc", "core"]
+build-std = ["core"]

Cargo.toml

@@ -10,6 +10,5 @@ hal = { package = "esp32-hal", version = "0.15.0" }
 esp-backtrace = { version = "0.8.0", features = ["esp32", "panic-handler", "exception-handler", "print-uart"] }
 esp-println = { version = "0.6.0", features = ["esp32","log"] }
 log = { version = "0.4.18" }
-esp-alloc = { version = "0.3.0" }
 si5351 = "0.2.0"
 embedded-hal = "0.2.7"

src/main.rs

@@ -1,8 +1,6 @@
 #![no_std]
 #![no_main]
 
-extern crate alloc;
-use core::mem::MaybeUninit;
 use esp_backtrace as _;
 
 use embedded_hal::serial::Read;
@@ -19,20 +17,8 @@ use hal::{
 
 use si5351::{Si5351, Si5351Device};
 
-#[global_allocator]
-static ALLOCATOR: esp_alloc::EspHeap = esp_alloc::EspHeap::empty();
-
-fn init_heap() {
-    const HEAP_SIZE: usize = 32 * 1024;
-    static mut HEAP: MaybeUninit<[u8; HEAP_SIZE]> = MaybeUninit::uninit();
-
-    unsafe {
-        ALLOCATOR.init(HEAP.as_mut_ptr() as *mut u8, HEAP_SIZE);
-    }
-}
 #[entry]
 fn main() -> ! {
-    init_heap();
     let peripherals = Peripherals::take();
     //let uart = peripherals.UART0;
     let mut system = peripherals.DPORT.split();