controller

sprites/sprites.asm

@@ -0,0 +1,116 @@
+  .inesprg 1   ; 1x 16KB PRG code
+  .ineschr 1   ; 1x  8KB CHR data
+  .inesmap 0   ; mapper 0 = NROM, no bank swapping
+  .inesmir 1   ; background mirroring
+  
+
+;;;;;;;;;;;;;;;
+
+    
+  .bank 0
+  .org $C000 
+RESET:
+  SEI          ; disable IRQs
+  CLD          ; disable decimal mode
+  LDX #$40
+  STX $4017    ; disable APU frame IRQ
+  LDX #$FF
+  TXS          ; Set up stack
+  INX          ; now X = 0
+  STX $2000    ; disable NMI
+  STX $2001    ; disable rendering
+  STX $4010    ; disable DMC IRQs
+
+vblankwait1:       ; First wait for vblank to make sure PPU is ready
+  BIT $2002
+  BPL vblankwait1
+
+clrmem:
+  LDA #$00
+  STA $0000, x
+  STA $0100, x
+  STA $0300, x
+  STA $0400, x
+  STA $0500, x
+  STA $0600, x
+  STA $0700, x
+  LDA #$FE
+  STA $0200, x    ;move all sprites off screen
+  INX
+  BNE clrmem
+   
+vblankwait2:      ; Second wait for vblank, PPU is ready after this
+  BIT $2002
+  BPL vblankwait2
+
+
+
+; ************** NEW CODE ****************
+LoadPalettes:
+  LDA $2002    ; read PPU status to reset the high/low latch
+  LDA #$3F
+  STA $2006    ; write the high byte of $3F00 address
+  LDA #$00
+  STA $2006    ; write the low byte of $3F00 address
+  LDX #$00
+LoadPalettesLoop:
+  LDA palette, x        ;load palette byte
+  STA $2007             ;write to PPU
+  INX                   ;set index to next byte
+  CPX #$20            
+  BNE LoadPalettesLoop  ;if x = $20, 32 bytes copied, all done
+
+
+
+  LDA #$20
+  STA $0200        ; put sprite 0 in center ($80) of screen vert
+  STA $0203        ; put sprite 0 in center ($80) of screen horiz
+  LDA #$01
+  STA $0201        ; tile number = 0
+  LDA #$02
+  STA $0202        ; color = 0, no flipping
+
+  LDA #%10000000   ; enable NMI, sprites from Pattern Table 0
+  STA $2000
+
+  LDA #%00010000   ; enable sprites
+  STA $2001
+
+Forever:
+  JMP Forever     ;jump back to Forever, infinite loop
+  
+ 
+
+NMI:
+  LDA #$00
+  STA $2003  ; set the low byte (00) of the RAM address
+  LDA #$02
+  STA $4014  ; set the high byte (02) of the RAM address, start the transfer
+  
+  RTI        ; return from interrupt
+ 
+;;;;;;;;;;;;;;  
+  
+  
+  
+  .bank 1
+  .org $E000
+palette:
+  .db $0F,$31,$32,$33,$0F,$35,$36,$37,$0F,$39,$3A,$3B,$0F,$3D,$3E,$0F
+  .db $0F,$1C,$15,$14,$0F,$02,$38,$3C,$0F,$1C,$15,$14,$0F,$02,$38,$3C
+
+
+  .org $FFFA     ;first of the three vectors starts here
+  .dw NMI        ;when an NMI happens (once per frame if enabled) the 
+                   ;processor will jump to the label NMI:
+  .dw RESET      ;when the processor first turns on or is reset, it will jump
+                   ;to the label RESET:
+  .dw 0          ;external interrupt IRQ is not used in this tutorial
+  
+  
+;;;;;;;;;;;;;;  
+  
+  
+  .bank 2
+  .org $0000
+  .incbin "mario.chr"   ;includes 8KB graphics file from SMB1

sprites/sprites.fns

@@ -0,0 +1,10 @@
+; sprites.asm
+LoadPalettes                     = $C03D
+Forever                          = $C073
+palette                          = $E000
+LoadPalettesLoop                 = $C04C
+vblankwait1                      = $C014
+vblankwait2                      = $C038
+clrmem                           = $C019
+RESET                            = $C000
+NMI                              = $C076