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sprite animation testing
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testingAnimation/src/vid.asm

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  1. ;--------------------

  2. ; Video Subroutines

  3. ;--------------------

  4. 

  5. SECTION "VBlank Int", ROM0[$40]

  6.    ld a, 1

  7.    ld [hVBlankFlag], a

  8.    reti

  9. 

  10. SECTION "Vid Subs", ROM0

  11. 

  12. Wait_VBlank::

  13.    ld   hl, hVBlankFlag  ; hl=pointer to vblank_flag

  14. .wait:                   ; wait...

  15.    halt                  ; suspend CPU - wait for ANY interrupt

  16.    nop

  17.    xor a

  18.    cp   a,[hl]           ; vblank flag still zero?

  19.    jr   z, .wait         ; wait more if zero

  20.    ld   [hl],a           ; set vblank_flag back to zero

  21.    ret