From 90b498dd94393fe89b315b826676cf656d208470 Mon Sep 17 00:00:00 2001
From: Erick Ahmed <engineering@erickahmed.com>
Date: Thu, 25 Dec 2025 22:58:27 +0100
Subject: [PATCH] Fix instructions for better compat for callback from main

---
 src/clockinator.S |  6 +++---
 src/led.inc       | 19 ++++++++++---------
 2 files changed, 13 insertions(+), 12 deletions(-)

diff --git a/src/clockinator.S b/src/clockinator.S
index 61479ff..37a5a84 100644
--- a/src/clockinator.S
+++ b/src/clockinator.S
@@ -37,9 +37,9 @@ loop:
 
     ;rcall      midi_send       ; Send MIDI ping
 
-    rcall       blink_led
-    in          r16,        TIFR0       ; Check timer0 status
-    sbrc        r16,        OCF0A       ; Skip stop_blink if clear
+    ; if midi clock then also do: rcall       start_blink
+    in          r16,        TIFR0       ; Read Interrupt Flag Register
+    sbrs        r16,        OCF0A       ; If timer status OCF0A=1 skip jump
     rcall       stop_blink
 
 
diff --git a/src/led.inc b/src/led.inc
index 5038164..8b7808f 100644
--- a/src/led.inc
+++ b/src/led.inc
@@ -1,26 +1,27 @@
 #define __SFR_OFFSET 0
 #include <avr/io.h>
 
-blink_led:
-    clr     r16                                         ; Clear register
-    out     TCNT0,      r16                             ; Reset Counter to 0
+start_blink:
     sbi     PORTB,      PB0                             ; Set LED on
 
-    ldi     r16,        (1<<OCF0A)
+    ldi     r16,        (1 << OCF0A)                    ; Clear timer status flag
     out     TIFR0,      r16                             ; Clear timer0 status
 
+    clr     r16                                         ; Clear register
+    out     TCNT0,      r16                             ; Reset Counter to 0
+
     ldi     r16,        (1 << CS02) | (1 << CS00)       ; Load prescaler value (00000101 = prescaler 1024)
     out     TCCR0B,     r16                             ; Enable clock source
 
     ret
 
-blink_delay:
-    in      r16,        TIFR0                           ; Read Interrupt Flag Register
-    sbrs    r16,        OCF0A                           ; If OCF0A = 1 skip jump
-    rjmp    wait_loop                                   ; Else loopback
+stop_blink:
+    cbi     PORTB,      PB0                             ; Set LED off
 
     clr     r16                                         ; Cleanup register
     out     TCCR0B, r16                                 ; Stop timer0 by clearing prescaler
 
-    cbi     PORTB, PB0                                  ; Set LED off
+    ldi     r16,        (1 << OCF0A)
+    out     TIFR0,      r16                             ; Clear timer status flag
+
     ret