fixed inputs still missing sometimes, updated build script

Code/joypad.asm

@@ -1,11 +1,21 @@
 INCLUDE "hardware.inc"
 
+EXPORT JoypadDown, JoypadPressed
 Section "Joypad memory", HRAM
 ; Bits 0..7 are A, B, Select, Start, Right, Left, Up, Down
 JoypadPressed: ds 1
-JoypadWasPressed: ds 1
+JoypadNewlyPressed: ds 1
 JoypadDown: ds 1
 
+EXPORT InitJoypad
+SECTION "Init joypad", ROM0
+InitJoypad:
+	xor a
+	ldh [JoypadDown], a
+	ldh [JoypadPressed], a
+	ldh [JoypadNewlyPressed], a
+	ret
+
 EXPORT ReadJoypad
 SECTION "Read Joypad", ROM0
 ReadJoypad:
@@ -33,9 +43,12 @@ ReadJoypad:
 	; complement so that active buttons read as 1
 	or a, b
 	cpl
-
-	; store currently pressed buttons
-	ldh [JoypadPressed], a
+	
+	; add to currently pressed buttons
+	ld b, a
+	ldh a, [JoypadNewlyPressed]
+	or a, b
+	ldh [JoypadNewlyPressed], a
 
 	; reset joypad
 	ld a, $30
@@ -43,27 +56,23 @@ ReadJoypad:
 
 	ret
 
+EXPORT UpdateJoypad
 SECTION "Update joypad", ROM0
 UpdateJoypad:	
 	; compute & store just pressed buttons
-	ldh a, [JoypadPressed]
+	ldh a, [JoypadNewlyPressed]
 	ld b, a
-	ldh a, [JoypadWasPressed]
+	ldh a, [JoypadPressed]
 	cpl 
 	and a, b
 	ldh [JoypadDown], a
 	
-	; update was pressed
+	; update pressed
 	ld a, b
-	ldh [JoypadWasPressed], a
+	ldh [JoypadPressed], a
+	
+	; reset newly pressed
+	xor a
+	ldh [JoypadNewlyPressed], a
 	
 	ret
-
-EXPORT InitJoypad
-SECTION "Init joypad", ROM0
-InitJoypad:
-	xor a
-	ldh [JoypadDown], a
-	ldh [JoypadPressed], a
-	ldh [JoypadWasPressed], a
-	ret