mirror of
https://github.com/peterdell/wudsn-ide.git
synced 2024-12-21 03:29:32 +00:00
369 lines
15 KiB
NASM
369 lines
15 KiB
NASM
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; @com.wudsn.ide.asm.mainsourcefile=MyNESGame-Header.asm
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;;;;;;;;;;;;;;;
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Sprite1YPos EQU $0200
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Sprite1Tile EQU $0201
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Sprite1Atributes EQU $0202
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Sprite1XPos EQU $0203
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;;;;;;;;;;;;;;;
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;bank 0
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org $C000
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RESET:
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SEI ; disable IRQs
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CLD ; disable decimal mode
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LDX #$40
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STX $4017 ; disable APU frame IRQ
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LDX #$FF
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TXS ; Set up stack
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INX ; now X = 0
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STX $2000 ; disable NMI
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STX $2001 ; disable rendering
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STX $4010 ; disable DMC IRQs
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vblankwait1: ; First wait for vblank to make sure PPU is ready
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BIT $2002
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BPL vblankwait1
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clrmem:
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LDA #$00
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STA $0000, x
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STA $0100, x
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STA $0300, x
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STA $0400, x
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STA $0500, x
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STA $0600, x
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STA $0700, x
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LDA #$FE
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STA $0200, x
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INX
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BNE clrmem
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vblankwait2: ; Second wait for vblank, PPU is ready after this
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BIT $2002
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BPL vblankwait2
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LoadPalettes:
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LDA $2002 ; read PPU status to reset the high/low latch
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LDA #$3F
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STA $2006 ; write the high byte of $3F00 address
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LDA #$00
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STA $2006 ; write the low byte of $3F00 address
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LDX #$00 ; start out at 0
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LoadPalettesLoop:
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LDA palette, x ; load data from address (palette + the value in x)
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; 1st time through loop it will load palette+0
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; 2nd time through loop it will load palette+1
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; 3rd time through loop it will load palette+2
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; etc
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STA $2007 ; write to PPU
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INX ; X = X + 1
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CPX #$20 ; Compare X to hex $10, decimal 16 - copying 16 bytes = 4 sprites
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BNE LoadPalettesLoop ; Branch to LoadPalettesLoop if compare was Not Equal to zero
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; if compare was equal to 32, keep going down
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LoadSprites:
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LDX #$00 ; start at 0
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LoadSpritesLoop:
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LDA sprites, x ; load data from address (sprites + x)
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STA $0200, x ; store into RAM address ($0200 + x)
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INX ; X = X + 1
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CPX #$10 ; Compare X to hex $10, decimal 16
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BNE LoadSpritesLoop ; Branch to LoadSpritesLoop if compare was Not Equal to zero
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; if compare was equal to 16, keep going down
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LoadBackground:
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LDA $2002 ; read PPU status to reset the high/low latch
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LDA #$20
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STA $2006 ; write the high byte of $2000 address
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LDA #$00
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STA $2006 ; write the low byte of $2000 address
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LDA #$00
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STA pointerLo ; put the low byte of the address of background into pointer
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LDA #>background
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STA pointerHi ; put the high byte of the address into pointer
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LDX #$00 ; start at pointer + 0
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LDY #$00
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OutsideLoop:
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InsideLoop:
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LDA (pointerLo), y ; copy one background byte from address in pointer plus Y
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STA $2007 ; this runs 256 * 4 times
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INY ; inside loop counter
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CPY #$00
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BNE InsideLoop ; run the inside loop 256 times before continuing down
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INC pointerHi ; low byte went 0 to 256, so high byte needs to be changed now
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INX
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CPX #$04
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BNE OutsideLoop ; run the outside loop 256 times before continuing down
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LDA #%10010000 ; enable NMI, sprites from Pattern Table 0, background from Pattern Table 1
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STA $2000
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LDA #%00011110 ; enable sprites, enable background, no clipping on left side
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STA $2001
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;----------------------------------------------------------------------
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;------------------------START MAIN LOOP-------------------------------
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;----------------------------------------------------------------------
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Main:
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LDA #$01
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STA updating_background ;this is for when you are changing rooms or something, not really needed here
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;it will skip the NMI updates so as not to mess with your room loading routines
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JSR ReadJoyPads
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;JSR GameStateIndirect
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LDA GameState
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CMP GameStateOld
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BEQ @next
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;JSR GameStateUpdate
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@next:
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LDA #$00
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STA updating_background
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INC bIsSleeping ;Wait for NMI (Main Goes To Sleep)
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@loop:
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LDA bIsSleeping
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BNE @loop ;Program continues when NMI clears flag
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JMP Main ;Wake Up and Update for next frame
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;---------Read Pads 1 & 2--------------------------------------------------
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ReadJoyPads:
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ldx #$00 ;Load x with #$00. Used to read status of joypad 1.
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stx $01 ;
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jsr @ReadOnePad ;
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inx ;Load x with #$01. Used to read status of joypad 2.
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inc $01 ;
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@ReadOnePad:
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ldy #$01 ;These lines strobe the -->
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sty CPUJOYPAD1 ;joystick to enable the -->
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dey ;program to read the -->
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sty CPUJOYPAD1 ;buttons pressed.
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ldy #$08 ;Do 8 buttons.
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@a: pha ;Store A.
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lda CPUJOYPAD1,x ;Read button status. Joypad 1 or 2.
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sta $00 ;Store button press at location $00.
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lsr ;Move button push to carry bit.
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ora $00 ;If joystick not connected, -->
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lsr ;fills Joy1Status with all 1s.
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pla ;Restore A.
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rol ;Add button press status to A.
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dey ;Loop 8 times to get -->
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bne @a ;status of all 8 buttons.
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ldx $01 ;Joypad #(0 or 1).
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ldy Joy1Status,x ;Get joypad status of previous refresh.
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sty $00 ;Store at $00.
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sta Joy1Status,x ;Store current joypad status.
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eor $00 ;
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beq @b ;Branch if no buttons changed.
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lda $00 ;
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and #$BF ;Remove the previous status of the B button.
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sta $00 ;
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eor Joy1Status,x ;
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@b: and Joy1Status,x ;Save any button changes from the current frame-->
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sta Joy1Change,x ;and the last frame to the joy change addresses.
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;sta Joy1Retrig,x ;Store any changed buttons in JoyRetrig address.
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;ldy #$20 ;
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;lda Joy1Status,x ;Checks to see if same buttons are being-->
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;cmp $00 ;pressed this frame as last frame.-->
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;bne @c ;If none, branch.
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;dec RetrigDelay1,x ;Decrement RetrigDelay if same buttons pressed.
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;bne @exit ;
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;sta Joy1Retrig,x ;Once RetrigDelay=#$00, store buttons to retrigger.
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;ldy #$08 ;
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;@c ;sty RetrigDelay1,x ;Reset retrigger delay to #$20(32 frames)-->
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@exit rts ;or #$08(8 frames) if already retriggering.
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;*************************************************
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; NMI
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;*************************************************
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NMI:
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php ;Save processor status, A, X and Y on stack.
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pha ;Save A.
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txa ;
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pha ;Save X.
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tya ;
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pha ;Save Y.
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lda #$00 ;
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sta SPRADDRESS ;Sprite RAM address = 0.
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lda #$02 ;
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sta SPRDMAREG ;Transfer page 2 ($200-$2FF) to Sprite RAM.
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lda bIsSleeping ;
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bne ++ ;Skip if the frame couldn't finish in time.
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lda GameState ;
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beq + ;Branch if mode=Play.
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;jsr NMIScreenWrite ;($9A07)Write end message on screen(If appropriate).
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+ ;jsr CheckPalWrite ;($C1E0)Check if palette data pending.
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;jsr CheckPPUWrite ;($C2CA)check if data needs to be written to PPU.
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;----------------
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; PPU Cleanup
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;----------------
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;This is the PPU clean up section, so rendering the next frame starts properly.
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LDA #%10010000 ; enable NMI, sprites from Pattern Table 0, background from Pattern Table 1
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STA $2000
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LDA #%00011110 ; enable sprites, enable background, no clipping on left side
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STA $2001
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LDA #$00 ;tell the ppu there is no background scrolling
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STA $2005
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STA $2005
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;----------------
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; End PPU Cleanup
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;----------------
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;jsr WriteScroll ;($C29A)Update h/v scroll reg.
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;jsr ReadJoyPads ;($C215)Read both joypads.
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++ ;jsr SoundEngine ;($B3B4)Update music and SFX.
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;jsr UpdateAge ;($C97E)Update Samus' age.
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ldy #$00 ; NMI = finished.
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sty bIsSleeping ;
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pla ;Restore Y.
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tay ;
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pla ;Restore X.
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tax ;
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pla ;restore A.
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plp ;Restore processor status flags.
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rti ;Return from NMI.
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;*************************************************
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; End NMI
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;*************************************************
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;--------------------------------[ Simple divide and multiply routines ]-----------------------------
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Adiv32:
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lsr ;Divide by 32.
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Adiv16:
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lsr ;Divide by 16.
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Adiv8:
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lsr ;Divide by 8.
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lsr ;
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lsr ;Division falls through and returns
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rts ;
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Amul32:
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asl ;Multiply by 32.
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Amul16:
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asl ;Multiply by 16.
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Amul8:
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asl ;Multiply by 8.
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asl ;
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asl ;Multiplication falls through and returns
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rts ;
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;*************************************************
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; Start PPU Section
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;*************************************************
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pad $E000
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background:
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db $24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24 ;; Row 01 all sky
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db $24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24 ;; Row 02 all sky
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db $24,$24,$24,$24,$45,$45,$24,$24,$45,$45,$45,$45,$45,$45,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$53,$54,$24,$24 ;; Row 03 some brick tops
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db $24,$24,$24,$24,$47,$47,$24,$24,$47,$47,$47,$47,$47,$47,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$55,$56,$24,$24 ;; Row 04 brick bottoms
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db $24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24 ;; Row 05 all sky
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db $24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24 ;; Row 06 all sky
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db $24,$24,$24,$24,$45,$45,$24,$24,$45,$45,$45,$45,$45,$45,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$53,$54,$24,$24 ;; Row 07 some brick tops
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db $24,$24,$24,$24,$47,$47,$24,$24,$47,$47,$47,$47,$47,$47,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$55,$56,$24,$24 ;; Row 08 brick bottoms
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db $24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24 ;; Row 09 all sky
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db $24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24 ;; Row 10 all sky
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db $24,$24,$24,$24,$45,$45,$24,$24,$45,$45,$45,$45,$45,$45,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$53,$54,$24,$24 ;; Row 11 some brick tops
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db $24,$24,$24,$24,$47,$47,$24,$24,$47,$47,$47,$47,$47,$47,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$55,$56,$24,$24 ;; Row 12 brick bottoms
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db $24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24 ;; Row 13 all sky
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db $24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24 ;; Row 14 all sky
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db $24,$24,$24,$24,$45,$45,$24,$24,$45,$45,$45,$45,$45,$45,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$53,$54,$24,$24 ;; Row 15 some brick tops
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db $24,$24,$24,$24,$47,$47,$24,$24,$47,$47,$47,$47,$47,$47,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$55,$56,$24,$24 ;; Row 16 brick bottoms
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db $24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24 ;; Row 17 all sky
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db $24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24 ;; Row 18 all sky
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db $24,$24,$24,$24,$45,$45,$24,$24,$45,$45,$45,$45,$45,$45,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$53,$54,$24,$24 ;; Row 19 some brick tops
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db $24,$24,$24,$24,$47,$47,$24,$24,$47,$47,$47,$47,$47,$47,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$55,$56,$24,$24 ;; Row 20 brick bottoms
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db $24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24 ;; Row 21 all sky
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db $24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24 ;; Row 22 all sky
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db $24,$24,$24,$24,$45,$45,$24,$24,$45,$45,$45,$45,$45,$45,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$53,$54,$24,$24 ;; Row 23 some brick tops
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db $24,$24,$24,$24,$47,$47,$24,$24,$47,$47,$47,$47,$47,$47,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$55,$56,$24,$24 ;; Row 24 brick bottoms
|
||
|
|
|
||
|
|
db $24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24 ;; Row 25 all sky
|
||
|
|
db $24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24 ;; Row 26 all sky
|
||
|
|
db $24,$24,$24,$24,$45,$45,$24,$24,$45,$45,$45,$45,$45,$45,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$53,$54,$24,$24 ;; Row 27 some brick tops
|
||
|
|
db $24,$24,$24,$24,$47,$47,$24,$24,$47,$47,$47,$47,$47,$47,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$55,$56,$24,$24 ;; Row 28 brick bottoms
|
||
|
|
|
||
|
|
db $24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24 ;; Row 29 all sky
|
||
|
|
db $24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24 ;; Row 30 all sky
|
||
|
|
;db $24,$24,$24,$24,$45,$45,$24,$24,$45,$45,$45,$45,$45,$45,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$53,$54,$24,$24 ;; Row 31 some brick tops
|
||
|
|
;db $24,$24,$24,$24,$47,$47,$24,$24,$47,$47,$47,$47,$47,$47,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$55,$56,$24,$24 ;; Row 32 brick bottoms
|
||
|
|
|
||
|
|
|
||
|
|
attribute:
|
||
|
|
db %00000000, %00010000, %01010000, %00010000, %00000000, %00000000, %00000000, %00110000 ; Rows 01-04
|
||
|
|
db %00000000, %00010000, %01010000, %00010000, %00000000, %00000000, %00000000, %00110000 ; Rows 05-08
|
||
|
|
db %00000000, %00010000, %01010000, %00010000, %00000000, %00000000, %00000000, %00110000 ; Rows 09-12
|
||
|
|
db %00000000, %00010000, %01010000, %00010000, %00000000, %00000000, %00000000, %00110000 ; Rows 13-16
|
||
|
|
db %00000000, %00010000, %01010000, %00010000, %00000000, %00000000, %00000000, %00110000 ; Rows 17-20
|
||
|
|
db %00000000, %00010000, %01010000, %00010000, %00000000, %00000000, %00000000, %00110000 ; Rows 21-24
|
||
|
|
db %00000000, %00010000, %01010000, %00010000, %00000000, %00000000, %00000000, %00110000 ; Rows 25-28
|
||
|
|
db %00000000, %00010000, %01010000, %00010000, %00000000, %00000000, %00000000, %00110000 ; Rows 29-32
|
||
|
|
|
||
|
|
; db $24,$24,$24,$24, $47,$47,$24,$24
|
||
|
|
; db $47,$47,$47,$47, $47,$47,$24,$24
|
||
|
|
;db $24,$24,$24,$24 ,$24,$24,$24,$24
|
||
|
|
;db $24,$24,$24,$24, $55,$56,$24,$24 ;;brick bottoms (What is this??)
|
||
|
|
;db $47,$47,$47,$47, $47,$47,$24,$24
|
||
|
|
;db $24,$24,$24,$24 ,$24,$24,$24,$24
|
||
|
|
;db $24,$24,$24,$24, $55,$56,$24,$24
|
||
|
|
|
||
|
|
palette:
|
||
|
|
db $22,$29,$1A,$0F, $22,$36,$17,$0F, $22,$30,$21,$0F, $22,$27,$17,$0F ;;background palette
|
||
|
|
db $22,$1C,$15,$14, $22,$02,$38,$3C, $22,$1C,$15,$14, $22,$02,$38,$3C ;;sprite palette
|
||
|
|
|
||
|
|
sprites:
|
||
|
|
;vert tile attr horiz
|
||
|
|
db $80, $32, $00, $80 ;sprite 0
|
||
|
|
db $80, $33, $00, $88 ;sprite 1
|
||
|
|
db $88, $34, $00, $80 ;sprite 2
|
||
|
|
db $88, $35, $00, $88 ;sprite 3
|
||
|
|
|
||
|
|
;*************************************************
|
||
|
|
; End PPU Section
|
||
|
|
;*************************************************
|