v0.4.0

closes #32
closes #33

src/export.rs

@@ -0,0 +1,84 @@
+/// IMPLEMENTATION DETAILS. DO NOT USE ANYTHING IN THIS MODULE
+use core::{hint, ptr};
+
+#[cfg(armv7m)]
+use cortex_m::register::basepri;
+pub use cortex_m::{
+    asm::wfi, interrupt, peripheral::scb::SystemHandler, peripheral::syst::SystClkSource,
+    peripheral::Peripherals,
+};
+pub use cortex_m_rt::{entry, exception};
+pub use heapless::consts;
+use heapless::spsc::Queue;
+
+#[cfg(feature = "timer-queue")]
+pub use crate::tq::{isr as sys_tick, NotReady, TimerQueue};
+
+pub type FreeQueue<N> = Queue<u8, N>;
+pub type ReadyQueue<T, N> = Queue<(T, u8), N>;
+
+#[cfg(armv7m)]
+#[inline(always)]
+pub fn run<F>(f: F)
+where
+    F: FnOnce(),
+{
+    let initial = basepri::read();
+    f();
+    unsafe { basepri::write(initial) }
+}
+
+#[cfg(not(armv7m))]
+#[inline(always)]
+pub fn run<F>(f: F)
+where
+    F: FnOnce(),
+{
+    f();
+}
+
+// TODO(MaybeUninit) Until core::mem::MaybeUninit is stabilized we use our own (inefficient)
+// implementation
+pub struct MaybeUninit<T> {
+    value: Option<T>,
+}
+
+impl<T> MaybeUninit<T> {
+    pub const fn uninitialized() -> Self {
+        MaybeUninit { value: None }
+    }
+
+    pub unsafe fn get_ref(&self) -> &T {
+        if let Some(x) = self.value.as_ref() {
+            x
+        } else {
+            hint::unreachable_unchecked()
+        }
+    }
+
+    pub unsafe fn get_mut(&mut self) -> &mut T {
+        if let Some(x) = self.value.as_mut() {
+            x
+        } else {
+            hint::unreachable_unchecked()
+        }
+    }
+
+    pub fn set(&mut self, val: T) {
+        unsafe { ptr::write(&mut self.value, Some(val)) }
+    }
+}
+
+#[inline(always)]
+pub fn assert_send<T>()
+where
+    T: Send,
+{
+}
+
+#[inline(always)]
+pub fn assert_sync<T>()
+where
+    T: Sync,
+{
+}