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Add subroutine to clear ppu nametables. Call during reset init after … #7

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Add subroutine to clear ppu nametables. Call during reset init after … #7

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20 changes: 20 additions & 0 deletions src/lib/ppu.s
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Original file line number Diff line number Diff line change
Expand Up @@ -222,3 +222,23 @@ PALETTE = $3f00
bne @loop
rts
.endproc

.proc clear_nametable_and_attr
ldy #4
lda #0
: ldx #0
: sta PPU_DATA
inx
bne :-
dey
bne :--
rts
.endproc

.proc clear_screen
Vram NAMETABLE_A
jsr clear_nametable_and_attr
Vram NAMETABLE_C
jsr clear_nametable_and_attr
rts
.endproc
1 change: 1 addition & 0 deletions src/smb-movement.s
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Expand Up @@ -103,6 +103,7 @@
sta $700, x
inx
bne @ram_reset_loop
jsr clear_screen
lda #%11101111
@sprite_reset_loop:
sta $200, x
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