X-Git-Url: http://git.joshuawise.com/fpgaboy.git/blobdiff_plain/39a68cde9f2a76dabfcc9d7654f212ad1d7b356a..f8c46ff554cb7f4c067eab1234faf729118c4c25:/diag.asm diff --git a/diag.asm b/diag.asm index 7f06de0..3a3d665 100644 --- a/diag.asm +++ b/diag.asm @@ -1,9 +1,8 @@ - section "end",HOME[1024] - nop - SECTION "a",HOME[$00] -start: jp main +start: ld a, $AA + ld [$FF51], a + jr start section "vbl",HOME[$40] jp vbl @@ -14,6 +13,19 @@ start: jp main section "tmro",HOME[$50] jp tmro + SECTION "b",HOME[$100] +boot: jr main ; $0100 + nop ; $0102 + nop ; $0103 + ;Nintendo Logo ; $0104 + DB $CE,$ED,$66,$66,$CC,$0D,$00,$0B,$03,$73,$00,$83,$00,$0C,$00,$0D + DB $00,$08,$11,$1F,$88,$89,$00,$0E,$DC,$CC,$6E,$E6,$DD,$DD,$D9,$99 + DB $BB,$BB,$67,$63,$6E,$0E,$EC,$CC,$DD,$DC,$99,$9F,$BB,$B9,$33,$3E + ;$0134 + DB $00,$E7,$00,$00,$00,$00,$00,$00, $00,$00,$00,$00,$00,$00,$00,$00 + ;$0144 + DB $00,$00,$00,$00,$00,$00,$00,$00, $00,$00,$00,$00,$00,$00,$00,$00 + main: ld a, $FF ld c, $51 @@ -33,6 +45,9 @@ main: ld hl, signon call puts + ld a, $91 + ld [$FF40], a + call putscreen ei @@ -50,23 +65,88 @@ main: signon: db $0D,$0A,$1B,"[1mFPGABoy Diagnostic ROM",$1B,"[0m",$0D,$0A,0 +tiles: + db %01111100 + db %11000110 + db %11000110 + db %11111110 + db %11000110 + db %11000110 + db %11000110 + db %00000000 + + db %11111100 + db %11000110 + db %11000110 + db %11111100 + db %11000110 + db %11000110 + db %11111100 + db %00000000 + + db %01111100 + db %11000110 + db %11000010 + db %11000000 + db %11000010 + db %11000110 + db %01111100 + db %00000000 + + db %11111100 + db %11000110 + db %11000110 + db %11000110 + db %11000110 + db %11000110 + db %11111100 + db %00000000 + putscreen: - ld a, $FF ; Copy two tiles. - ld hl, $8000 + LD A,$fc ; $001d Setup BG palette + LD [$FF47],A ; $001f + + ; Wait for vblank + call .vblwait + + ld hl, $8000 ; Copy two tiles. + ld de, tiles + ld c, $20 +.cloop: ld a, [de] + inc de ld [hli], a ld [hli], a + dec c xor a - ld [hli], a - ld [hli], a + cp c + jr nz, .cloop ld hl, $9800 -.loop: ld a, $FF - ld [hli], a - xor a +.vloop: call .vblwait + ld c, $40 + ld b, 0 +.loop: ld a, b + inc b + and $03 ld [hli], a ld a, h cp $9C - jp nz,.loop + ret z + dec c + xor a + cp c + jr nz,.loop + jr .vloop + +.vblwait: +.stat1: ld a, [$FF41] ; STAT + and $03 + cp $00 + jp nz, .stat1 +.stat2: ld a, [$FF41] + and $03 + cp $01 + jr nz, .stat2 ret vbl: @@ -78,11 +158,23 @@ vbl: xor a ld [$FF0F], a - ld c, $42 ; SCY - ld a, [c] - inc a - ld [c], a + ld a, [$FF51] + bit 7, a + jr z, .nothing + bit 0, a + call nz, .scyup + + bit 1, a + call nz, .scydown + + bit 2, a + call nz, .scxup + + bit 3, a + call nz, .scxdown + +.nothing: POP HL POP DE POP BC @@ -90,6 +182,23 @@ vbl: RETI +.scyup: ld hl, $FF42 + inc [hl] + ret + +.scydown: ld hl, $FF42 + dec [hl] + ret + +.scxup: ld hl, $FF43 + inc [hl] + ret + +.scxdown: ld hl, $FF43 + dec [hl] + ret + + lcdc: PUSH AF PUSH BC @@ -224,8 +333,8 @@ waitsw: ld a,[c] cp $0 jr z,.loop1 -.loop2: - ld a,[c] + +.loop2: ld a,[c] cp $0 jr nz,.loop2 ret @@ -368,14 +477,14 @@ insntest: ; Serial port manipulation functions. putc: - ld c, $50 + ld c, $53 push af .waitport: ld a,[c] - cp $00 + and $01 jr nz,.waitport pop af - ld [c],a + ld [$FF52],a ret puts: