Joshua Wise's Git repositories - fpgaboy.git/blame_incremental

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Commit	Line	Data
	1	SECTION "a",HOME
	2	main:
	3	ld c, $51
	4	ld a, $FF
	5	ld [c],a
	6	ld sp,$DFFF
	7
	8	ld hl,text
	9	call puts
	10
	11	call memtest
	12	call waitsw
	13	jp main
	14
	15	text:
	16	db $0D,$0A,$1B,"[1mFPGABoy Diagnostic ROM",$1B,"[0m",$0D,$0A,0
	17
	18	memtest:
	19	ld hl,memteststr
	20	call puts
	21
	22	ld hl, $C000
	23	.wr:
	24	ld a,h
	25	xor l
	26	ld [hli],a
	27	ld a, $DF
	28	cp h
	29	jp nz, .wr
	30	ld a, $80
	31	cp l
	32	jp nz, .wr
	33
	34	ld hl, $C000
	35	.rd:
	36	ld a,h
	37	xor l
	38	ld b,a
	39	ld a, [hli]
	40	cp b
	41	jp nz, .memfail
	42
	43	ld a, $DF
	44	cp h
	45	jp nz, .rd
	46	ld a, $80
	47	cp l
	48	jp nz, .rd
	49
	50	ld hl, testokstr
	51	call puts
	52	ret
	53	.memfail:
	54	@ decrement hl the easy way
	55	ld a,[hld]
	56	push hl
	57	ld hl, failatstr
	58	call puts
	59	pop hl
	60	ld a, h
	61	call puthex
	62	ld a, l
	63	call puthex
	64	ld a, $0A
	65	call putc
	66	ld a, $0D
	67	call putc
	68	ret
	69
	70	memteststr:
	71	db "Testing memory from $C000 to $DF80...",0
	72	testokstr:
	73	db " OK!",$0D,$0A,0
	74	failatstr:
	75	db " Test failed at $",0
	76	puthex:
	77	push af
	78	rra
	79	rra
	80	rra
	81	rra
	82	ld b,$0F
	83	and b
	84	ld b,$30
	85	add b
	86	call putc
	87	pop af
	88	ld b,$0F
	89	and b
	90	ld b,$30
	91	add b
	92	call putc
	93	ret
	94
	95	waitsw:
	96	ld hl,waitswstr
	97	call puts
	98
	99	ld c, $51
	100	ld a, $00
	101	ld [c],a
	102
	103	ld c, $51
	104	ld b, $0
	105	.loop1:
	106	ld a,[c]
	107	cp b
	108	jp z,.loop1
	109	.loop2:
	110	ld a,[c]
	111	cp b
	112	jp nz,.loop2
	113	ret
	114
	115	waitswstr:
	116	db "Diagnostic ROM complete; flip switches to nonzero and then to zero to reset.",$0D,$0A,0
	117
	118	putc:
	119	push af
	120	ld b, 0
	121	ld c, $50
	122	.waitport:
	123	ld a,[c]
	124	cp b
	125	jp nz,.waitport
	126	pop af
	127	ld [c],a
	128	ret
	129
	130	puts:
	131	ld a, [hli]
	132	ld b, $00
	133	cp b
	134	jp z, .done
	135	call putc
	136	jp puts
	137	.done:
	138	ret
	139