; Cleanup by Ullrich von Bassewitz <uz@cc65.org>
;
- .export ppuinit
- .export paletteinit, paldata
+ .export ppuinit
+ .export paletteinit, paldata
- .include "nes.inc"
+ .include "nes.inc"
;+---------+----------------------------------------------------------+
-;| $2000 | PPU Control Register #1 (W) |
-;| | |
-;| | D7: Execute NMI on VBlank |
-;| | 0 = Disabled |
-;| | 1 = Enabled |
-;| | D6: PPU Master/Slave Selection --+ |
-;| | 0 = Master +-- UNUSED |
-;| | 1 = Slave --+ |
-;| | D5: Sprite Size |
-;| | 0 = 8x8 |
-;| | 1 = 8x16 |
-;| | D4: Background Pattern Table Address |
-;| | 0 = $0000 (VRAM) |
-;| | 1 = $1000 (VRAM) |
-;| | D3: Sprite Pattern Table Address |
-;| | 0 = $0000 (VRAM) |
-;| | 1 = $1000 (VRAM) |
-;| | D2: PPU Address Increment |
-;| | 0 = Increment by 1 |
-;| | 1 = Increment by 32 |
-;| | D1-D0: Name Table Address |
-;| | 00 = $2000 (VRAM) |
-;| | 01 = $2400 (VRAM) |
-;| | 10 = $2800 (VRAM) |
-;| | 11 = $2C00 (VRAM) |
+;| $2000 | PPU Control Register #1 (W) |
+;| | |
+;| | D7: Execute NMI on VBlank |
+;| | 0 = Disabled |
+;| | 1 = Enabled |
+;| | D6: PPU Master/Slave Selection --+ |
+;| | 0 = Master +-- UNUSED |
+;| | 1 = Slave --+ |
+;| | D5: Sprite Size |
+;| | 0 = 8x8 |
+;| | 1 = 8x16 |
+;| | D4: Background Pattern Table Address |
+;| | 0 = $0000 (VRAM) |
+;| | 1 = $1000 (VRAM) |
+;| | D3: Sprite Pattern Table Address |
+;| | 0 = $0000 (VRAM) |
+;| | 1 = $1000 (VRAM) |
+;| | D2: PPU Address Increment |
+;| | 0 = Increment by 1 |
+;| | 1 = Increment by 32 |
+;| | D1-D0: Name Table Address |
+;| | 00 = $2000 (VRAM) |
+;| | 01 = $2400 (VRAM) |
+;| | 10 = $2800 (VRAM) |
+;| | 11 = $2C00 (VRAM) |
;+---------+----------------------------------------------------------+
;+---------+----------------------------------------------------------+
-;| $2001 | PPU Control Register #2 (W) |
-;| | |
-;| | D7-D5: Full Background Colour (when D0 == 1) |
-;| | 000 = None +------------+ |
-;| | 001 = Green | NOTE: Do not use more |
-;| | 010 = Blue | than one type |
-;| | 100 = Red +------------+ |
-;| | D7-D5: Colour Intensity (when D0 == 0) |
-;| | 000 = None +--+ |
-;| | 001 = Intensify green | NOTE: Do not use more |
-;| | 010 = Intensify blue | than one type |
-;| | 100 = Intensify red +--+ |
-;| | D4: Sprite Visibility |
-;| | 0 = Sprites not displayed |
-;| | 1 = Sprites visible |
-;| | D3: Background Visibility |
-;| | 0 = Background not displayed |
-;| | 1 = Background visible |
-;| | D2: Sprite Clipping |
-;| | 0 = Sprites invisible in left 8-pixel column |
-;| | 1 = No clipping |
-;| | D1: Background Clipping |
-;| | 0 = BG invisible in left 8-pixel column |
-;| | 1 = No clipping |
-;| | D0: Display Type |
-;| | 0 = Colour display |
-;| | 1 = Monochrome display |
+;| $2001 | PPU Control Register #2 (W) |
+;| | |
+;| | D7-D5: Full Background Colour (when D0 == 1) |
+;| | 000 = None +------------+ |
+;| | 001 = Green | NOTE: Do not use more |
+;| | 010 = Blue | than one type |
+;| | 100 = Red +------------+ |
+;| | D7-D5: Colour Intensity (when D0 == 0) |
+;| | 000 = None +--+ |
+;| | 001 = Intensify green | NOTE: Do not use more |
+;| | 010 = Intensify blue | than one type |
+;| | 100 = Intensify red +--+ |
+;| | D4: Sprite Visibility |
+;| | 0 = Sprites not displayed |
+;| | 1 = Sprites visible |
+;| | D3: Background Visibility |
+;| | 0 = Background not displayed |
+;| | 1 = Background visible |
+;| | D2: Sprite Clipping |
+;| | 0 = Sprites invisible in left 8-pixel column |
+;| | 1 = No clipping |
+;| | D1: Background Clipping |
+;| | 0 = BG invisible in left 8-pixel column |
+;| | 1 = No clipping |
+;| | D0: Display Type |
+;| | 0 = Colour display |
+;| | 1 = Monochrome display |
;+---------+----------------------------------------------------------+
;-----------------------------------------------------------------------------
-.proc ppuinit
+.proc ppuinit
- lda #%10101000
- sta PPU_CTRL1
+ lda #%10101000
+ sta PPU_CTRL1
- lda #%00011110
- sta PPU_CTRL2
+ lda #%00011110
+ sta PPU_CTRL2
; Wait for vblank
-@wait: lda PPU_STATUS
- bpl @wait
+@wait: lda PPU_STATUS
+ bpl @wait
; reset scrolling
- lda #0
- sta PPU_VRAM_ADDR1
- sta PPU_VRAM_ADDR1
+ lda #0
+ sta PPU_VRAM_ADDR1
+ sta PPU_VRAM_ADDR1
; Make all sprites invisible
- lda #$00
- ldy #$f0
- sta PPU_SPR_ADDR
- ldx #$40
-@loop: sty PPU_SPR_IO
- sta PPU_SPR_IO
- sta PPU_SPR_IO
- sty PPU_SPR_IO
- dex
- bne @loop
+ lda #$00
+ ldy #$f0
+ sta PPU_SPR_ADDR
+ ldx #$40
+@loop: sty PPU_SPR_IO
+ sta PPU_SPR_IO
+ sta PPU_SPR_IO
+ sty PPU_SPR_IO
+ dex
+ bne @loop
- rts
+ rts
.endproc
;-----------------------------------------------------------------------------
-.proc paletteinit
+.proc paletteinit
; Wait for v-blank
-@wait: lda PPU_STATUS
- bpl @wait
-
- lda #$3F
- sta PPU_VRAM_ADDR2
- lda #$00
- sta PPU_VRAM_ADDR2
-
- ldx #0
-@loop: lda paldata,x
- sta PPU_VRAM_IO
- inx
- cpx #(16*2)
- bne @loop
-
- rts
-
+@wait: lda PPU_STATUS
+ bpl @wait
+
+ lda #$3F
+ sta PPU_VRAM_ADDR2
+ lda #$00
+ sta PPU_VRAM_ADDR2
+
+ ldx #0
+@loop: lda paldata,x
+ sta PPU_VRAM_IO
+ inx
+ cpx #(16*2)
+ bne @loop
+
+ rts
+
.endproc
;-----------------------------------------------------------------------------
.rodata
paldata:
- .repeat 2
- .byte $0f ; 0 black
- .byte $14 ; 4 violett
- .byte $3b ; 3 cyan
- .byte $3d ; 1 white
-
- .byte $38 ; 7 yellow
- .byte $2d ; b dark grey
- .byte $22 ; e light blue
- .byte $04 ; 2 red
-
- .byte $18 ; 8 orange
- .byte $08 ; 9 brown
- .byte $35 ; a light red
- .byte $01 ; 6 blue
-
- .byte $10 ; c middle grey
- .byte $2b ; d light green
- .byte $3d ; f light gray
- .byte $1a ; 5 green
- .endrepeat
+ .repeat 2
+ .byte $0f ; 0 black
+ .byte $14 ; 4 violett
+ .byte $3b ; 3 cyan
+ .byte $3d ; 1 white
+
+ .byte $38 ; 7 yellow
+ .byte $2d ; b dark grey
+ .byte $22 ; e light blue
+ .byte $04 ; 2 red
+
+ .byte $18 ; 8 orange
+ .byte $08 ; 9 brown
+ .byte $35 ; a light red
+ .byte $01 ; 6 blue
+
+ .byte $10 ; c middle grey
+ .byte $2b ; d light green
+ .byte $3d ; f light gray
+ .byte $1a ; 5 green
+ .endrepeat
projects / cc65 / blobdiff