From b83804d58aa7d5a04c9b336c523b1337bc2411d3 Mon Sep 17 00:00:00 2001
From: Bad Diode <bd@badd10de.dev>
Date: Thu, 4 Jan 2024 16:40:17 +0100
Subject: Add basic MIDI 24bpq sync in

---
 src/sequencer.c | 30 ++++++++++++++++--------------
 1 file changed, 16 insertions(+), 14 deletions(-)

diff --git a/src/sequencer.c b/src/sequencer.c
index 9dcaa89..b5cfd46 100644
--- a/src/sequencer.c
+++ b/src/sequencer.c
@@ -346,16 +346,16 @@ play_step(void) {
     step_counter = (step_counter + 1) % 16;
 }
 
+static int nseq_ticks = 0;
+
 void
 sequencer_tick(void) {
-    static int nseq_ticks = 0;
-    if (nseq_ticks++ < 24) {
+    if (nseq_ticks++ == 0) {
+        play_step();
         return;
+    } else if (nseq_ticks == 24) {
+        nseq_ticks = 0;
     }
-    nseq_ticks = 0;
-
-    // NOTE: ACK interrupt before play_step???
-    play_step();
 }
 
 void
@@ -523,6 +523,7 @@ stop_sound(void) {
 void
 stop_playing(void) {
     step_counter = 0;
+    nseq_ticks = 0;
     chain.current = 15;
     chain.current = find_next_pattern();
     chain.playing = false;
@@ -534,6 +535,7 @@ void
 toggle_playing(void) {
     play_status ^= 1;
     step_counter = 0;
+    nseq_ticks = 0;
     chain.current = 15;
     chain.current = find_next_pattern();
     chain.playing = false;
@@ -1559,14 +1561,14 @@ reset_serial_in(void) {
 void
 serial_irq(void) {
     if (play_status) {
-        if (in_ticks++ == 0) {
-            // TODO: Instead of play_step use the nseq_ticks instead!
-            play_step();
-            // MIDI: 24 / 8 = 3
-            // set to 6 for half tempo
-        } else if (in_ticks == 3) {
-            in_ticks = 0;
-        }
+        sequencer_tick();
+        sequencer_tick();
+        sequencer_tick();
+        sequencer_tick();
+        sequencer_tick();
+        sequencer_tick();
+        sequencer_tick();
+        sequencer_tick();
     }
 }
 
-- 
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