From 02e5b211c6e31ca8f9ec19ff6ec52d4f5bbef568 Mon Sep 17 00:00:00 2001
From: Uri Shaked
Date: Sat, 26 Dec 2020 00:24:54 +0200
Subject: fix(timer): Overflow interrupt fires twice #80

fix #80
---
 src/peripherals/timer.ts | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

(limited to 'src/peripherals/timer.ts')

diff --git a/src/peripherals/timer.ts b/src/peripherals/timer.ts
index 957aa78..6ea29e3 100644
--- a/src/peripherals/timer.ts
+++ b/src/peripherals/timer.ts
@@ -445,7 +445,7 @@ export class AVRTimer {
         // OCRUpdateMode.Bottom only occurs in Phase Correct modes, handled by phasePwmCount().
         // Thus we only handle TOVUpdateMode.Top or TOVUpdateMode.Max here.
         if (
-          (newVal === TOP || overflow) &&
+          (newVal === TOP || (overflow && val < TOP)) &&
           (this.tovUpdateMode == TOVUpdateMode.Top || TOP === this.MAX)
         ) {
           cpu.setInterruptFlag(this.OVF);
@@ -453,7 +453,11 @@ export class AVRTimer {
       }
     }
     if (this.tcntUpdated) {
+      const { TOP } = this;
       this.tcnt = this.tcntNext;
+      if (this.tcnt === TOP && (this.tovUpdateMode == TOVUpdateMode.Top || TOP === this.MAX)) {
+        cpu.setInterruptFlag(this.OVF);
+      }
       this.tcntUpdated = false;
     }
     if (this.updateDivider) {
-- 
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