diff --git a/examples/embassy/src/lib.rs b/examples/embassy/src/lib.rs
index 6c0053e..2a0f6b3 100644
--- a/examples/embassy/src/lib.rs
+++ b/examples/embassy/src/lib.rs
@@ -134,7 +134,11 @@ impl TimerDriverEmbassy {
 
     // Should be called inside the IRQ of the alarm timer.
     fn on_interrupt_alarm(&self, idx: usize) {
-        critical_section::with(|cs| self.trigger_alarm(idx, cs))
+        critical_section::with(|cs| {
+            if self.alarms.borrow(cs)[idx].timestamp.get() < self.now() {
+                self.trigger_alarm(idx, cs)
+            }
+        })
     }
 
     fn next_period(&self) {
@@ -146,10 +150,11 @@ impl TimerDriverEmbassy {
                 let alarm = &self.alarms.borrow(cs)[i];
                 let at = alarm.timestamp.get();
                 let alarm_tim = alarm_tim(0);
-                if at < t + three_quarters_of_period(alarm_tim.rst_value().read().bits() as u64) {
+                if at < t + three_quarters_of_period(rst_val) {
                     alarm_tim.enable().write(|w| unsafe { w.bits(0) });
-                    let rst_val = alarm_tim.rst_value().read().bits();
-                    alarm_tim.cnt_value().write(|w| unsafe { w.bits(rst_val) });
+                    alarm_tim
+                        .cnt_value()
+                        .write(|w| unsafe { w.bits((at - t) as u32) });
                     alarm_tim.ctrl().modify(|_, w| w.irq_enb().set_bit());
                     alarm_tim.enable().write(|w| unsafe { w.bits(1) })
                 }
@@ -270,7 +275,7 @@ impl Driver for TimerDriverEmbassy {
                 .write(|w| unsafe { w.bits(rst_val_alarm) });
 
             let diff = timestamp - t;
-            if diff < (three_quarters_of_period(rst_val_alarm as u64)) {
+            if diff < (three_quarters_of_period(rst_val as u64)) {
                 alarm_tim
                     .cnt_value()
                     .write(|w| unsafe { w.bits(rst_val_alarm) });