X-Git-Url: http://git.joshuawise.com/fpgaboy.git/blobdiff_plain/f888201b9894683abfff012bd68b641319fb2744..4fd47c85d2419ac8fa788696f7fda03cf3ce8124:/diag.asm diff --git a/diag.asm b/diag.asm index 28fce99..e9a9f19 100644 --- a/diag.asm +++ b/diag.asm @@ -1,22 +1,39 @@ - SECTION "a",HOME + section "end",HOME[1024] + nop + + SECTION "a",HOME[$00] + +start: jp main + + section "vbl",HOME[$40] + jp vbl + + section "lcdc",HOME[$48] + jp lcdc + + section "tmro",HOME[$50] + jp tmro main: - ld c, $51 ; Note that we are alive. ld a, $FF - ld [c],a - + ld c, $51 + ld [c], a + ld sp, $DFF0 - ld c, $07 ld a, $04 ;start timer, 4.096KHz + ld c, $07 ld [c], a - + ld hl, $DF81 xor a - ld [hl], a + ld [hli], a + ld [hli], a ld hl, signon call puts + + call putscreen ei @@ -33,26 +50,184 @@ main: signon: db $0D,$0A,$1B,"[1mFPGABoy Diagnostic ROM",$1B,"[0m",$0D,$0A,0 - section "fuq",HOME[$100] -irqhand: +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: + ; 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 + cp c + jr nz, .cloop + + ld hl, $9800 +.vloop: call .vblwait + ld c, $40 + ld b, 0 +.loop: ld a, b + inc b + and $03 + ld [hli], a + ld a, h + cp $9C + ret z + dec c + xor a + cp c + jr nz,.loop + jr .vloop + +.vblwait: +.stat1: ld a, [$FF41] ; STAT + and $03 + cp $00 + jp nz, .stat1 +.stat2: ld a, [$FF41] + and $03 + cp $01 + jr nz, .stat2 + ret + +vbl: + PUSH AF + PUSH BC + PUSH DE + PUSH HL + + xor a + ld [$FF0F], a + + ld a, [$FF51] + ld b, a + and $80 + cp $80 + jr nz, .nothing + ld c, $0 + + ld a, b + and $1 + cp c + call nz, .scyup + + ld a, b + and $2 + cp c + call nz, .scydown + + ld a, b + and $4 + cp c + call nz, .scxup + + ld a, b + and $8 + cp c + call nz, .scxdown + +.nothing: + POP HL + POP DE + POP BC + POP AF + + 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, $FF43 + dec [hl] + ret + + +lcdc: + PUSH AF + PUSH BC + + xor a + ld [$FF0F], a + + POP BC + POP AF + + reti + +tmro: PUSH AF PUSH BC PUSH DE PUSH HL xor a - ld c, $0F ; ack the irq + ld [$FF0F], a + + ld c, $45 ; LYC + ld a, [c] + inc a ld [c], a + ld a, [$DF82] + cp 0 + jr z, .noprint ld a, $41 ; print A call putc - - ld hl, $DF81 - ld a, [hl] - add 1 - ld c, $51 - ld [c], a - ld [hl], a +.noprint: + ld a, [$DF81] + inc a + ld [$DF81], a + ld [$FF51], a POP HL POP DE @@ -65,7 +240,7 @@ memtest: ld hl,memteststr call puts - ld hl, $C001 ; Write loop + ld hl, $C000 ; Write loop .wr: ld a,h xor l @@ -77,7 +252,7 @@ memtest: cp $80 jr nz, .wr - ld hl, $C001 ; Read loop + ld hl, $C000 ; Read loop .rd: ld a,h xor l @@ -98,7 +273,7 @@ memtest: ret .memfail: ; Say we failed (sadface) ; decrement hl the easy way - ld a,[hld] + dec [hl] push hl ld hl, failatstr call puts @@ -138,6 +313,10 @@ puthex: ; Put two hex nibbles to the serial console. waitsw: ld hl,waitswstr call puts + + ld hl,$DF82 + ld a, 1 + ld [hl], a ld c, $51 xor a @@ -227,11 +406,37 @@ insntest: cpl cp $AA jr nz,.fail + + ; Test DI/EI delay + di + ld hl, .dinocausefail + ld c, $0F ; First, wait until an interrupt happens... +.wait: ld a, [c] + and $04 + cp 0 + jr z, .wait + ei ; Now make sure that an IRQ didn't happen on EI/DI + di + ld a, [c] + and $04 + cp 0 + jr z, .fail + ld hl, .dicausefail + ei ; Make sure that an IRQ does happen on EI/NOP/DI + nop + nop + di + ld a, [c] + and $04 + cp 0 + jr nz, .fail + ei ld hl, .ok call puts ret .fail: + ei call puts ld hl, .testfailed call puts @@ -254,6 +459,10 @@ insntest: db "CPL",0 .inc16fail: db "INC16",0 +.dinocausefail: + db "DI/EI does not cause interrupt",0 +.dicausefail: + db "DI/NOP/EI cause interrupt",0 .testfailed: db " test failed.",$0D,$0A,0 .ok: @@ -277,3 +486,4 @@ puts: ret z call putc jr puts +