X-Git-Url: http://git.joshuawise.com/fpgaboy.git/blobdiff_plain/49c326da841985a8aa48e8544173e5c045c6e0eb..bf3f2c5f96cdfc7629e93d810f42550349388122:/fpgaboot.asm

diff --git a/fpgaboot.asm b/fpgaboot.asm
index a923657..6cb9613 100644
--- a/fpgaboot.asm
+++ b/fpgaboot.asm
@@ -1,37 +1,123 @@
 	SECTION "boot", HOME[$0]
-	ld a, $AA
+boot:	ld a, $AA
 	ld [$FF51], A	; Poke the LEDs
+
+	ld sp, $FFFE
 	
-	; Write a little bit to the RAM
-	ld H, $01
-	ld L, $00
-	ld A, $00
-	ld [HLI], A
-	ld [HLI], A
-	ld [HLI], A
-	ld [HLI], A
-	ld [HLI], A
-	ld [HLI], A
-	ld [HLI], A
-	ld [HLI], A
+	ld hl, signon
+	call puts
+	
+.wait:	ld a, [$FF53]
+	and $02
+	jr z, .nodata
+	ld a, [$FF52]
+	ld [$FF51], a
+	
+	cp $1B		; Escape
+	jp z, .cbc
+	ld [$FF52], a
+.cbc:	call z, bootcmd
+
+.nodata:	ld a, [$FF51]
+	cp $00
+	jr nz, .wait
+
+doboot:	xor a
+	ld h, a
+	ld l, a
+	ld [hl], $01	; Select the GB boot rom
 	
 	ld a, $55
-	ld [$FF51], A	; Poke the LEDs
+	ld [c], a
 	
-	ld A, $FF
-	ld [HLI], A
-	ld [HLI], A
-	ld [HLI], A
-	ld [HLI], A
-	ld [HLI], A
-	ld [HLI], A
-	ld [HLI], A
-	ld [HLI], A
+	ld hl, booting
+	call puts
 	
-	ld H, $00
-	ld L, $00
-	ld [HL], $01	; Select the GB boot rom
 	rst $00		; Boot
+
+signon:
+	db $0D,$0A,$1B,"[1mFPGABoy Boot ROM",$1B,"[0m",$0D,$0A,0
+booting:
+	db "Booting...",$0D,$0A,0
+
+putc:
+	ld c, $53
+	push af
+.waitport:
+	ld a,[c]
+	and $01
+	jr nz,.waitport
+	pop af
+	ld [$FF52],a
+	ret
+
+puts:
+	ld a, [hli]
+	cp $00
+	ret z
+	call putc
+	jr puts
+
+getc:
+	ld a, [$FF53]
+	and $02
+	jr z, getc
+	ld a, [$FF52]
+	ret
+
+bootcmd:
+	call getc
+	cp $56	;V
+	jr z,.version
+	cp $41	;A
+	jr z,.addr
+	cp $44	;D
+	jr z,.data
+	cp $50	;P
+	jr z,.prog
+	cp $42	;B
+	jr z,doboot
+	cp $1B
+	jr z,bootcmd	; If you keep yelling, you're bound to get the thing's attention.
+	ld a, $3f	;?
+	jr putc
+.version:
+	ld hl, .verstr
+	jr puts
+.verstr:
+	db "V1.00",0
+.addr:
+	call getc
+	ld [$FF60], A
+	call getc
+	ld [$FF61], A
+	call getc
+	ld [$FF62], A
+	ld A, $41	;A
+	jr putc
+.data:
+	call getc	; byte count
+	ld c, a
+.dl:	dec c
+	jr z, .done
+	call getc
+	ld [$FF63], A
+	jr .dl
+.done:	ld A, $44	;D
+	jr putc
+
+.prog:
+	ld hl, $FF80
+	ld c, $7F
+.pl:	dec c
+	jp z, .progboot
+	call getc
+	ld [hli], a
+	jr .pl
+.progboot:
+	ld a, $50	;P
+	call putc
+	jp $FF80
 	
 	SECTION "a", HOME[$100]
 	nop	; Make sure we don't overflow.