diff --git a/assemble.sh b/assemble.sh index 4f3df48..396970f 100755 --- a/assemble.sh +++ b/assemble.sh @@ -1,5 +1,6 @@ #! /bin/sh -ca65 src/helloworld.asm +ca65 src/spaceship.asm ca65 src/reset.asm -ld65 src/reset.o src/helloworld.o -C nes.cfg -o helloworld.nes +ca65 src/controllers.asm +ld65 src/reset.o src/controllers.o src/spaceship.o -C nes.cfg -o spaceship.nes diff --git a/helloworld.dbg b/helloworld.dbg deleted file mode 100644 index 7dfeef9..0000000 --- a/helloworld.dbg +++ /dev/null @@ -1 +0,0 @@ -BreakPoint: startAddr=00002002 endAddr=00000000 flags=EC--X- condition="" desc="" diff --git a/helloworld.nes b/spaceship.nes similarity index 91% rename from helloworld.nes rename to spaceship.nes index 9896830..0fe9ba9 100644 Binary files a/helloworld.nes and b/spaceship.nes differ diff --git a/src/background2.nam b/src/background2.nam new file mode 100644 index 0000000..2a16f14 Binary files /dev/null and b/src/background2.nam differ diff --git a/src/constants.inc b/src/constants.inc index 5acaec0..8367e0d 100644 --- a/src/constants.inc +++ b/src/constants.inc @@ -1,7 +1,18 @@ PPUCTRL = $2000 PPUMASK = $2001 PPUSTATUS = $2002 +PPUSCROLL = $2005 PPUADDR = $2006 PPUDATA = $2007 OAMADDR = $2003 -OAMDMA = $4014 \ No newline at end of file +OAMDMA = $4014 + +CONTROLLER1 = $4016 +BTN_RIGHT = %00000001 +BTN_LEFT = %00000010 +BTN_DOWN = %00000100 +BTN_UP = %00001000 +BTN_START = %00010000 +BTN_SELECT =%00100000 +BTN_B = %01000000 +BTN_A = %10000000 \ No newline at end of file diff --git a/src/controllers.asm b/src/controllers.asm new file mode 100644 index 0000000..a61fa31 --- /dev/null +++ b/src/controllers.asm @@ -0,0 +1,35 @@ +.include "constants.inc" + +.segment "ZEROPAGE" +.importzp pad1 + +.segment "CODE" +.export read_controller +.proc read_controller + + PHA + TXA + PHA + PHP + + LDA #$01 + STA CONTROLLER1 + LDA #$00 + STA CONTROLLER1 + + LDA #%00000001 + STA pad1 + +get_buttons: + LDA CONTROLLER1 + LSR A + ROL pad1 + + BCC get_buttons + + PLP + PLA + TAX + PLA + RTS +.endproc \ No newline at end of file diff --git a/src/controllers.o b/src/controllers.o new file mode 100644 index 0000000..1595c62 Binary files /dev/null and b/src/controllers.o differ diff --git a/src/header.inc b/src/header.inc index fe09113..abed43c 100644 --- a/src/header.inc +++ b/src/header.inc @@ -2,7 +2,7 @@ .byte $4e, $45, $53, $1a ; Magic string that always begins an iNES header .byte $02 ; Number of 16KB PRG-ROM banks .byte $01 ; Number of 8KB CHR-ROM banks -.byte %00000001 ; Vertical mirroring, no save RAM, no mapper +.byte %00000000 ; Vertical mirroring, no save RAM, no mapper .byte %00000000 ; No special-case flags set, no mapper .byte $00 ; No PRG-RAM present .byte $00 ; NTSC format \ No newline at end of file diff --git a/src/helloworld.o b/src/helloworld.o deleted file mode 100644 index 2027abe..0000000 Binary files a/src/helloworld.o and /dev/null differ diff --git a/src/meta.msb b/src/meta.msb deleted file mode 100644 index 178b360..0000000 --- a/src/meta.msb +++ /dev/null @@ -1 +0,0 @@ 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\ No newline at end of file diff --git a/src/reset.o b/src/reset.o index a3a66e0..661fa27 100644 Binary files a/src/reset.o and b/src/reset.o differ diff --git a/src/helloworld.asm b/src/spaceship.asm similarity index 68% rename from src/helloworld.asm rename to src/spaceship.asm index 6f1af78..4c9fcfe 100644 --- a/src/helloworld.asm +++ b/src/spaceship.asm @@ -6,6 +6,8 @@ RTI .endproc +.import read_controller + .proc nmi_handler LDA #$00 STA OAMADDR @@ -15,10 +17,27 @@ ;Update tiles *after* DMA transfer JSR update_player JSR draw_player + JSR read_controller + + LDA scroll + CMP #$00 + BNE set_scroll_positions + + LDA ppucrtl_settings + EOR #%00000010 + STA ppucrtl_settings + STA PPUCTRL + LDA #240 + STA scroll + +set_scroll_positions: LDA #$00 - STA $2005 - STA $2005 + STA PPUSCROLL + DEC scroll + LDA scroll + STA PPUSCROLL + RTI .endproc @@ -104,35 +123,31 @@ TYA PHA - LDA player_x - CMP #$e0 - BCC not_at_right_edge - ; if BCC is not taken, we are greater than $e0 - LDA #$00 - STA player_dir ; start moving left - JMP direction_set ; we already chose a direction, - ; so we can skip the left side check -not_at_right_edge: - LDA player_x - CMP #$10 - BCS direction_set - ; if BCS not taken, we are less than $10 - LDA #$01 - STA player_dir ; start moving right -direction_set: - ; now, actually update player_x - LDA player_dir - CMP #$01 - BEQ move_right - ; if player_dir minus $01 is not zero, - ; that means player_dir was $00 and - ; we need to move left + LDA pad1 + AND #BTN_LEFT + BEQ check_right DEC player_x - JMP exit_subroutine -move_right: + DEC player_x +check_right: + LDA pad1 + AND #BTN_RIGHT + BEQ check_up INC player_x -exit_subroutine: - ; all done, clean up an return + INC player_x +check_up: + LDA pad1 + AND #BTN_UP + BEQ check_down + DEC player_y + DEC player_y + +check_down: + LDA pad1 + AND #BTN_DOWN + BEQ done_checking + INC player_y + INC player_y +done_checking: PLA TAY PLA @@ -145,6 +160,9 @@ exit_subroutine: .export main .proc main + LDA #239 + STA scroll + LDX PPUSTATUS LDX #$3f STX PPUADDR @@ -188,6 +206,39 @@ insideloop: CPX #$04 BNE outsideloop +load_background2: + LDX PPUSTATUS + LDX #$28 + STX PPUADDR + LDX #$00 + STX PPUADDR + + LDA #background2 + STA pointerHi + + LDX #$00 + LDY #$00 + +outsideloop2: + +insideloop2: + LDA (pointerLo), y + STA PPUDATA + INY + BNE insideloop2 + + INC pointerHi + + INX + CPX #$04 + BNE outsideloop2 + + LDA #%10010000 + STA ppucrtl_settings + STA PPUCTRL + vblankwait: ; wait for another vblank before continuing BIT PPUSTATUS BPL vblankwait @@ -203,10 +254,13 @@ forever: .segment "ZEROPAGE" player_x: .res 1 player_y: .res 1 -player_dir: .res 1 -.exportzp player_x, player_y pointerLo: .res 1 pointerHi: .res 1 +scroll: .res 1 +ppucrtl_settings: .res 1 +pad1: .res 1 +.exportzp player_x, player_y +.exportzp pad1 .segment "RODATA" palettes: .incbin "background.pal" @@ -218,6 +272,7 @@ sprite: .byte $78, $08, $00, $88 background: .incbin "background.nam" +background2: .incbin "background2.nam" .segment "VECTORS" .addr nmi_handler, reset_handler, irq_handler diff --git a/src/spaceship.o b/src/spaceship.o new file mode 100644 index 0000000..e532733 Binary files /dev/null and b/src/spaceship.o differ