From c5aafab3efd471cbc45f0cad0c142b18d4b80474 Mon Sep 17 00:00:00 2001
From: Rekai Musuka <rekai@musuka.dev>
Date: Thu, 24 Jun 2021 01:28:00 -0500
Subject: [PATCH] feat(snd): implement trigger event behaviour for lfsr

---
 src/sound.rs | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/sound.rs b/src/sound.rs
index f85a143..3ab9299 100644
--- a/src/sound.rs
+++ b/src/sound.rs
@@ -749,6 +749,9 @@ pub(crate) struct Channel4 {
 
     // Length Functionality
     length_timer: u16,
+
+    /// Linear Feedback Shift Register (15-bit)
+    lfsr: u16,
 }
 
 impl Channel4 {
@@ -781,6 +784,9 @@ impl Channel4 {
             if self.length_timer == 0 {
                 self.length_timer = 64;
             }
+
+            // LFSR behaviour during trigger event
+            self.lfsr = 0x7FFF;
         }
     }
 }