Temp commit for link script modification.

Cargo.toml

@@ -54,9 +54,10 @@ features = ["nightly"]
 nb = "1.1"
 
 [dev-dependencies.stm32f4xx-hal]
-git = "https://github.com/ZhiyaoMa98/stm32f4xx-hal.git"
-branch = "dependency"
-default-features = false
+# git = "https://github.com/ZhiyaoMa98/stm32f4xx-hal.git"
+# branch = "dependency"
+# default-features = false
+version = "0.21.0"
 features = ["stm32f405"]
 
 # *** Tests for sync - mailbox ***

examples/breathing_task.rs

@@ -0,0 +1,22 @@
+#![no_std]
+#![no_main]
+
+extern crate alloc;
+use hopter::{
+    debug::semihosting::{self, dbg_println},
+    task::{main, self},
+    time,
+};
+
+// Attribute `#[main]` marks the function as the entry function for the main
+// task. The function name can be arbitrary. The main function should accept
+// one argument which is the Cortex-M core peripherals.
+#[main]
+fn main(_: cortex_m::Peripherals) {
+    task::build_breathing()
+        .set_init(|| {})
+        .set_wait(|_| time::sleep_ms(1000))
+        .set_work(|_, _| dbg_println!("Hello"))
+        .spawn()
+        .unwrap();
+}

examples/over_limit_dynamic_stack.rs

@@ -0,0 +1,50 @@
+#![no_std]
+#![no_main]
+
+extern crate alloc;
+use core::usize;
+
+use hopter::{
+    config,
+    debug::semihosting::{self, dbg_println},
+    task::{self, main},
+};
+
+#[main]
+fn main(_: cortex_m::Peripherals) {
+    task::build()
+        .set_entry(test_task)
+        .set_stack_limit(512)
+        .spawn()
+        .unwrap();
+
+    task::change_current_priority(config::UNWIND_PRIORITY + 1).unwrap();
+
+    semihosting::terminate(true);
+}
+
+fn test_task() {
+    let print_on_drop = PrintOnDrop("Dropped during unwinding");
+
+    let val = fib(usize::MAX);
+
+    core::mem::forget(print_on_drop);
+
+    dbg_println!("{}", val);
+}
+
+fn fib(x: usize) -> usize {
+    if x <= 1 {
+        return x;
+    } else {
+        return fib(x - 1).overflowing_add(fib(x - 2)).0;
+    }
+}
+
+struct PrintOnDrop(&'static str);
+
+impl Drop for PrintOnDrop {
+    fn drop(&mut self) {
+        dbg_println!("{}", self.0);
+    }
+}