diff --git a/avr/modules/sk6812/main.asm b/avr/modules/sk6812/main.asm
index c267d94..a501b16 100644
--- a/avr/modules/sk6812/main.asm
+++ b/avr/modules/sk6812/main.asm
@@ -58,11 +58,12 @@ SK6812_Init:
 
   sbi SK6812_DDR, SK6812_PINNUM    ; set to output
   cbi SK6812_PORT, SK6812_PINNUM   ; set LOW
-  ldi r16, 150
+  ldi r16, 144
   sts sk6812NumLeds, r16
 
   rcall sk6812ReadConfFromEeprom
-  ldi r18, 1                       ; ON
+
+  ldi r18, 1                       ; ON   (DEBUG)
   rcall SK6812_SetState            ; (r16, r17, r18, r19, r20, r21, r23, r24, r25)
 
   sec
@@ -87,37 +88,6 @@ SK6812_Fini:
 
 
 
-; ---------------------------------------------------------------------------
-; @routine sk6812SetAllColor
-;
-; Set all LEDs to same colour.
-;
-; @param r18 red value
-; @param r19 green value
-; @param r20 blue value
-; @param r21 white value
-; @clobbers r23 (r16, r17, r24, r25)
-
-sk6812SetAllColor:
-  push r15
-    in r15, SREG
-    cli
-    ; reset
-    cbi SK6812_PORT, SK6812_PINNUM
-    Utils_WaitNanoSecs 80000, 0, r22            ; wait for 80us
-    lds r23, sk6812NumLeds
-sk6812SetAllColor_loop:
-      rcall sk6812SendQuadruple ; (r16, r17, r24, r25)
-      dec r23
-    brne sk6812SetAllColor_loop
-;    sbi SK6812_PORT, SK6812_PINNUM
-    out SREG, r15
-  pop r15
-  ret
-; @end
-
-
-
 
 ; ---------------------------------------------------------------------------
 ; @routine SK6812_SetState @global
@@ -249,6 +219,45 @@ sk6812SendPattern_loop2:
 
 
 
+; ---------------------------------------------------------------------------
+; @routine sk6812SetAllColor
+;
+; Set all LEDs to same colour.
+;
+; @param r18 red value
+; @param r19 green value
+; @param r20 blue value
+; @param r21 white value
+; @clobbers r23 (r16, r17, r24, r25)
+
+sk6812SetAllColor:
+  sbi SK6812_DDR, SK6812_PINNUM    ; set to output
+  cbi SK6812_PORT, SK6812_PINNUM
+  push r15
+    in r15, SREG
+    cli
+;    Utils_WaitNanoSecs 80000, 0, r22            ; wait for 80us
+    nop
+    nop
+    lds r23, sk6812NumLeds
+sk6812SetAllColor_loop:
+      rcall sk6812SendQuadruple ; (r16, r17, r24, r25)
+      dec r23
+    brne sk6812SetAllColor_loop
+
+    ; reset
+    cbi SK6812_PORT, SK6812_PINNUM
+    Utils_WaitNanoSecs 80000, 0, r22            ; wait for 80us
+
+;    sbi SK6812_PORT, SK6812_PINNUM
+
+    out SREG, r15
+  pop r15
+  ret
+; @end
+
+
+
 ; ---------------------------------------------------------------------------
 ; @routine sk6812SendQuadruple
 ;
@@ -283,8 +292,8 @@ sk6812SendQuadruple:
   ; send ZERO
   nop                              ; +1
   out SK6812_PORT, r25             ; +1   HIGH
-  nop
-  nop
+  nop                              ; +1
+  nop                              ; +1
   nop
   out SK6812_PORT, r24             ; +1
   nop                              ; +1
@@ -303,35 +312,104 @@ l_end:
 ; @end
 
 
+.macro SK6812_SENDBIT1
+sk6812SendBit:                     ;  1     0      1      0
+  rol r16                          ; +1    +1    125    125
+  sbi SK6812_PORT, SK6812_PINNUM   ; +2    +2    375    375
+  brcs sk6812SendBit_l1            ; +2    +1    625    500
+  cbi SK6812_PORT, SK6812_PINNUM   ; +2          875
+sk6812SendBit_l1:
+  nop                              ; +1    +1   1000    625
+  nop                              ; +1    +1   1125    750
+  brcc sk6812SendBit_l2            ; +1    +2   1250   1000
+  cbi SK6812_PORT, SK6812_PINNUM   ;       +2          1250
+sk6812SendBit_l2:                  ; 10    10   1250   1250
+.endmacro
 
+
+
+.macro SK6812_SENDBIT
+sk6812SendBit:                     ;  0    1
+  rol r16                          ; +1   +1
+  brcs sk6812SendBit_send1         ; +1   +2
+  ; send 0
+  nop                              ; +1
+  sbi SK6812_PORT, SK6812_PINNUM   ; +2
+  nop                              ; +1
+  nop                              ; +1
+  cbi SK6812_PORT, SK6812_PINNUM   ; +2
+;  nop                              ; +1
+  nop                              ; +1
+  rjmp sk6812SendBit_end           ; +2
+sk6812SendBit_send1:
+  ; send 1
+  sbi SK6812_PORT, SK6812_PINNUM   ;      +2
+  nop                              ;      +1
+  nop                              ;      +1
+  nop                              ;      +1
+  cbi SK6812_PORT, SK6812_PINNUM   ;      +2
+  nop                              ;      +1
+  nop                              ; +1
+  nop                              ;      +1
+sk6812SendBit_end:                 ; 13   13
+.endmacro
+
+
+sk6812SendByte4:
+  SK6812_SENDBIT
+  SK6812_SENDBIT
+  SK6812_SENDBIT
+  SK6812_SENDBIT
+
+  SK6812_SENDBIT
+  SK6812_SENDBIT
+  SK6812_SENDBIT
+  SK6812_SENDBIT
+
+  ret
+; @end
+
+
+#if 0
 ; ---------------------------------------------------------------------------
 ; @routine sk6812SendByte4
 ;
 ; reset: 80microsecs
 ; 0: 500ns high, 750ns low  (+/- 150ns)
 ; 1: 750ns high, 500ns low  (+/- 150ns)
-; 8 ticks per cycle
 ;
 ; @param r16 value
 ; @clobbers r16, r17, r24, r25
 
 sk6812SendByte4:
-  ldi r24, 0
-  ldi r25, (1<<SK6812_PINNUM)
+  rcall sk6812SendBit
+  rcall sk6812SendBit
+  rcall sk6812SendBit
+  rcall sk6812SendBit
 
-  M_SK6812_HANDLEBIT
-  M_SK6812_HANDLEBIT
-  M_SK6812_HANDLEBIT
-  M_SK6812_HANDLEBIT
-
-  M_SK6812_HANDLEBIT
-  M_SK6812_HANDLEBIT
-  M_SK6812_HANDLEBIT
-  M_SK6812_HANDLEBIT
-  ret                                ; +4
+  rcall sk6812SendBit
+  rcall sk6812SendBit
+  rcall sk6812SendBit
+  rcall sk6812SendBit
+  ret
 ; @end
 
 
+; @param: r16=current value
+sk6812SendBit:                     ;  1     0
+  rol r16                          ; +1    +1
+  sbi SK6812_PORT, SK6812_PINNUM   ; +2
+  brcs sk6812SendBit_l1            ; +2    +1
+  cbi SK6812_PORT, SK6812_PINNUM   ; +2
+sk6812SendBit_l1:
+  nop                              ; +1    +1
+  nop                              ; +1    +1
+  brcc sk6812SendBit_l2            ; +1    +2
+  cbi SK6812_PORT, SK6812_PINNUM   ;       +2
+sk6812SendBit_l2:
+  ret
+; @end
+#endif
 
 
 ; ---------------------------------------------------------------------------