cscg22-gearboy

CSCG 2022 Challenge 'Gearboy'
git clone https://git.sinitax.com/sinitax/cscg22-gearboy
Log | Files | Refs | sfeed.txt

sms_refresh_oam.s (632B)

      1        .include        "global.s"
      2
      3        .title  "VRAM utilities"
      4        .module VRAMUtils
      5
      6        .globl __shadow_OAM_base
      7
      8        .ez80
      9
     10        .area   _HOME
     11
     12; void refresh_OAM(); 
     13_refresh_OAM::
     14        DISABLE_VBLANK_COPY     ; switch OFF copy shadow SAT
     15        ld de, #.VDP_SAT
     16        VDP_WRITE_CMD d, e
     17
     18        ld h, #>_shadow_OAM
     19        ld l, #0
     20        ld c, #.VDP_DATA
     21        ld b, #64
     221$:
     23        outi
     24        jp nz, 1$
     25
     26        ld de, #(.VDP_SAT + 0x80)
     27        VDP_WRITE_CMD d, e
     28        ld b, #128
     292$:
     30        outi
     31        jp nz, 2$
     32
     33        ENABLE_VBLANK_COPY      ; switch OFF copy shadow SAT
     34        ret