2016-12-06 02:11:21 -08:00
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.MACRO Spin_Loop ARGS XCOUNT
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ldx #XCOUNT
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lvl3\@:
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lda #$ff
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lvl2\@:
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xba
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lda #$ff
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lvl1\@:
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dea
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cmp #$00
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bne lvl1\@
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xba
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dea
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cmp #$00
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bne lvl2\@
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dex
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txa
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cmp #$00
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bne lvl3\@
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.ENDM
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2016-12-07 01:13:29 -08:00
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.MACRO Set_A_8_XY_16
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; 16-bit xy, 8-bit a
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rep #%00010000
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sep #%00100000
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.ENDM
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2016-12-06 02:11:21 -08:00
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.MACRO Reset_Palette_Offset
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stz $2121
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.ENDM
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.MACRO Load_Palette_Color ARGS BYTE1 BYTE2
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lda #BYTE1
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sta $2122
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2016-12-15 20:14:46 -08:00
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lda #BYTE2
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sta $2122
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2016-12-06 02:11:21 -08:00
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.ENDM
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2016-12-06 02:51:01 -08:00
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.MACRO Set_Screen_Brightness
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lda #\1
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2016-12-07 01:13:29 -08:00
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sta $2100 ; $2100 is the screen brightness register
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2016-12-07 10:41:33 -08:00
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.ENDM
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.MACRO Enable_NMI_And_Joypad
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lda #%10000001
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sta $4200
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2016-12-06 02:51:01 -08:00
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.ENDM
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2016-12-15 00:01:32 -08:00
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; loads, in a loop, an alternating grid of tiles
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.MACRO Tile_Load_Loop
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ldx #$0400 ; load $0400 (VRAM address of tile data)
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TileLoadLoop:
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stx $2116 ; store VRAM address of tile data to VRAM address word-sized register
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lda #$01 ; smile tile
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sta $2118 ;store tile map entry to the address specified in $2116 - this increments or not based on 2115
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inx
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stx $2116
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lda #$00 ; blank tile
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sta $2118
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inx
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cpx #$0780 ; $400 - $780 seems to be limit of snes screen tile memory
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bne TileLoadLoop
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.ENDM
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