From b46ef639197d34bf7172febb2075e6ad369dfa73 Mon Sep 17 00:00:00 2001
From: Nathaniel Walizer <robots.are.love@gmail.com>
Date: Sat, 4 Jan 2025 13:41:23 -0800
Subject: [PATCH] Fix APU frame interrupt

---
 src/apu.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/src/apu.c b/src/apu.c
index 2e17f28..72f8c6f 100644
--- a/src/apu.c
+++ b/src/apu.c
@@ -289,8 +289,6 @@ nes_apu_Result nes_apu_run(nes_apu* apu, int cycles) {
 
             if (1 == apu->frame) {
                 half_clock = 1;
-            } else if (0 == apu->frame && 0 == apu->frame_reg) {
-                apu->status |= apu_Status_Frame_Int;
             }
 
             if (apu->frame_reg & apu_Frame_Mode) {
@@ -328,8 +326,14 @@ nes_apu_Result nes_apu_run(nes_apu* apu, int cycles) {
 */
             }
 
-            if (end) apu->frame = 0;
-            else apu->frame++;
+            if (end) {
+                apu->frame = 0;
+                if (0 == apu->frame_reg) {
+                    apu->status |= apu_Status_Frame_Int;
+                }
+            } else {
+                apu->frame++;
+            }
         }
 
         cycles -= run;