Inline with macros to save on jump clock cycles

src/clockinator.S

@@ -1,5 +1,5 @@
 ; Registers
-;   r16: ISR setup, reusable after main;
+;   r16: ISR setup, reused only by START_BLINK on loop
 
 .org 0x0000                             ; RESET Vector
     rjmp        main
@@ -56,13 +56,20 @@ loop:
 
 
     ; if midi clock then after do:
-    rcall       start_blink
+    ; SOME CPI HERE
+    brne        segment_led
+    START_BLINK                         ; Macro for inlining blink start logic
 
-
-    ;rcall      segment_led             ; Output current BPM to 3-digit 7-segment LED [r24]
+    rjmp      segment_led               ; Output current BPM to 3-digit 7-segment LED [r24]
 
 
     ; sleep when BPM is stabilized (whenever BPM calculation are not being done) and outside of midi send
     ; to do this explore MCUCR register, it can do a lot of stuff
 
-    rjmp        loop                    ; Loopback
+    rjmp        loop
+
+; TODO: move to separate file
+; keep as subroutine as it's called in two parts in the code
+; or it can create issues with compiler
+segment_led:
+    rjmp        loop

src/led.inc

@@ -1,7 +1,7 @@
 ; Registers:
 ;   r16: timer0 start and stop operations
 
-start_blink:
+.MACRO START_BLINK
     ldi     r16,       (1 << OCF0A)                     ; Write Output Compare Flag 0 A to 1
     out     TIFR,      r16                              ; Clear Timer0 interrupt flag register
 
@@ -12,8 +12,7 @@ start_blink:
     out     TCCR0B,     r16                             ; Enable clock source
 
     sbi     PORTB,      PB0                             ; Set LED on
-
-    ret
+.endm
 
 stop_blink:
     cbi     PORTB,      PB0                             ; Set LED off