xylo.asm

@@ -26,30 +26,52 @@ read_keyboard:
 	jr read_keyboard
 
 key_1:
-	ld de, 0x0000
+	ld c, 0
-	jr invoke
-
-key_2:
-	ld de, 0x0103
-	jr invoke
-
-key_3:
-	ld de, 0x0206
-	jr invoke
-
-key_4:
-	ld de, 0x0309
-	jr invoke
-
-key_5:
-	ld de, 0x040C
-invoke:
-	push de
 	call highlight_key
 	ld a, (counter)
-	add a, d
 	call play
-	pop de
+	ld c, 0
+	call highlight_key
+	jr inc_counter
+
+key_2:
+	ld c, 3
+	call highlight_key
+	ld a, (counter)
+	inc a
+	call play
+	ld c, 3
+	call highlight_key
+	jr inc_counter
+
+key_3:
+	ld c, 6
+	call highlight_key
+	ld a, (counter)
+	inc a
+	inc a
+	call play
+	ld c, 6
+	call highlight_key
+	jr inc_counter
+
+key_4:
+	ld c, 9
+	call highlight_key
+	ld a, (counter)
+	add a, 3
+	call play
+	ld c, 9
+	call highlight_key
+	jr inc_counter
+
+key_5:
+	ld c, 12
+	call highlight_key
+	ld a, (counter)
+	add a, 4
+	call play
+	ld c, 12
 	call highlight_key
 
 inc_counter:
@@ -57,26 +79,26 @@ inc_counter:
 	add a, 5
 	cp 25
 	jr nz, set_counter
-	jr zero_counter
+	jp zero_counter
 
 highlight_key:
 	ld hl, xylo
-	push de
+	ld b, 0
-	ld d, 0
+	add hl, bc
-	add hl, de
+	ld d, 15
-	ld e, 30
+highlight_row:
-	ld b, 15
+	ld e, 3
 highlight_block:
 	ld a, (hl)
 	xor %01000000
 	ld (hl), a
 	inc hl
-	ld (hl), a
+	dec e
-	inc hl
+	jr nz, highlight_block
-	ld (hl), a
+	ld c, 29
-	add hl, de
+	add hl, bc
-	djnz highlight_block
+	dec d
-	pop de
+	jr nz, highlight_row
 	ret
 
 INCLUDE "sample.asm"