Wait for vblank with HALT

src/main.s

@@ -14,6 +14,11 @@ SECTION "Frame", WRAM0
 
 frame:: db
 
+SECTION "VBlank", ROM0[$40]
+
+handle_vblank:
+    reti
+
 SECTION "Code", ROM0
 
 start:
@@ -21,6 +26,9 @@ start:
     res 7, [hl]
     res 2, [hl]
 
+    ld hl, rIE
+    ld [hl], IEF_VBLANK
+
     call BG_Init
     call OAM_Init
     call Keys_Init
@@ -46,7 +54,8 @@ start:
     call Keys_Update
     call Player_Update
 
-    call wait_for_vblank
+    ; wait for vblank
+    halt
 
     ld a, HIGH(_OAM)
     call DMA_Start

src/player.s

@@ -54,11 +54,11 @@ Player_Init::
 
 Player_Update::
     ; Only update every 2 frames
-    ld hl, frame
-    ld a, [hl]
-    and %1
-    cp %1
-    ret nz
+    ; ld hl, frame
+    ; ld a, [hl]
+    ; and %1
+    ; cp %1
+    ; ret nz
 
     ld hl, keys
     ld b, [hl]