From e4d9284e258a34b10cac2eff47ca2ccb470b460c Mon Sep 17 00:00:00 2001
From: Emil Fresk <emil.fresk@gmail.com>
Date: Sat, 11 Mar 2023 20:47:39 +0100
Subject: rtic-monotonics: Add interrupt tokens to make sure users bind
 interrupts

---
 rtic-monotonics/src/systick.rs | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

(limited to 'rtic-monotonics/src/systick.rs')

diff --git a/rtic-monotonics/src/systick.rs b/rtic-monotonics/src/systick.rs
index 691d7c7..feefc7e 100644
--- a/rtic-monotonics/src/systick.rs
+++ b/rtic-monotonics/src/systick.rs
@@ -36,7 +36,11 @@ impl Systick {
     /// `sysclk` and `TIMER_HZ`.
     ///
     /// Note: Give the return value to `TimerQueue::initialize()` to initialize the timer queue.
-    pub fn start(mut systick: cortex_m::peripheral::SYST, sysclk: u32) {
+    pub fn start(
+        mut systick: cortex_m::peripheral::SYST,
+        sysclk: u32,
+        _interrupt_token: impl crate::InterruptToken<Self>,
+    ) {
         // + TIMER_HZ / 2 provides round to nearest instead of round to 0.
         // - 1 as the counter range is inclusive [0, reload]
         let reload = (sysclk + TIMER_HZ / 2) / TIMER_HZ - 1;
@@ -154,10 +158,21 @@ impl embedded_hal_async::delay::DelayUs for Systick {
 #[macro_export]
 macro_rules! make_systick_handler {
     () => {
+    {
         #[no_mangle]
         #[allow(non_snake_case)]
         unsafe extern "C" fn SysTick() {
             rtic_monotonics::systick::Systick::__tq().on_monotonic_interrupt();
         }
+
+        pub struct SystickToken;
+
+        unsafe impl rtic_monotonics::InterruptToken<rtic_monotonics::systick::Systick>
+            for SystickToken
+        {
+        }
+
+        SystickToken
+    }
     };
 }
-- 
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