Constants for controller input

homebrew-tutorial/keys.inc

@@ -0,0 +1,17 @@
+
+; Joypad bitmaps
+
+
+JOYH_B     = %10000000
+JOYH_Y     = %01000000
+JOYH_SEL   = %00100000
+JOYH_START = %00010000
+JOYH_UP    = %00001000
+JOYH_DOWN  = %00000100
+JOYH_LEFT  = %00000010
+JOYH_RIGHT = %00000001
+
+JOYL_A     = %10000000
+JOYL_X     = %01000000
+JOYL_L     = %00100000
+JOYL_R     = %00010000

homebrew-tutorial/main.asm

@@ -3,6 +3,7 @@
 
 .include "macros.inc"
 .include "registers.inc"
+.include "keys.inc"
 
 .include "header.asm"
 
@@ -96,8 +97,8 @@ start:
     sta NMITIMEN
 
 mainloop:
-    lda JOY1H
-    bit #%00000100 ; Down button
+    lda JOY1L
+    bit #JOYL_L
     beq down_not_pressed
         ; write tile 2 to position (4, 8)
         TILE_X2= 4