GB 2015 day 1 part 1

gb/2015/1/not_quite_lisp.asm

@@ -16,8 +16,9 @@ EntryPoint:
 	ClearOAM
 	LoadTiles
 
-	MemClear current_frame, 1
+	MemClear current_frame, 2
 	MemClear current_floor, 2
+	MemClear first_basement_floor, 2
 	MemClear done_flag, 1
 
 	;; Initialize input_index
@@ -39,67 +40,86 @@ CheckInput:
 
 	cp a, "("
 	jr z, GoingUp
-	jr GoingDown
+	cp a, ")"
+	jr z, GoingDown
+	jr GoingNowhere
 GoingUp:	
 	call IncrementCurrentFloor
 	jr GoingNowhere
 GoingDown:	
+	ld a, [current_floor]
+	ld b, a
+	ld a, [current_floor + 1]
+	and a, b
+	call z, SaveBasementFloor
+
 	call DecrementCurrentFloor
 GoingNowhere:	
-
 	IncrementWord input_index
 
 	ld de, input_end
 	ld a, [input_index]
-	sub a, d
+	cp a, d
 	jr nz, CheckInput
 
 	ld a, [input_index + 1]
-	sub a, e
+	cp a, e
 	jr nz, CheckInput
 
 	ld a, 1
 	ld [done_flag], a
 
-Done:	
+	halt
+	nop
+	jr Done
 
+Done:	
 	halt
 	nop
 	jr Done
 
 IncrementCurrentFloor:
-	ld hl, current_floor
-	ld a, [hli]
+	ld a, [current_floor]
 	ld b, a
-	ld a, [hli]
+	ld a, [current_floor + 1]
 	ld c, a
 
 	inc bc
 
-	ld hl, current_floor
 	ld a, b
-	ld [hli], a
+	ld [current_floor], a
 	ld a, c
-	ld [hli], a
+	ld [current_floor + 1], a
 	
 	ret
 
 DecrementCurrentFloor:
-	ld hl, current_floor
-	ld a, [hli]
+	ld a, [current_floor]
 	ld b, a
-	ld a, [hli]
+	ld a, [current_floor + 1]
 	ld c, a
 
 	dec bc
 
-	ld hl, current_floor
 	ld a, b
-	ld [hli], a
+	ld [current_floor], a
 	ld a, c
-	ld [hli], a
+	ld [current_floor + 1], a
 	
 	ret
+
+SaveBasementFloor:
+	ld a, [first_basement_floor]
+	ld b, a
+	ld a, [first_basement_floor + 1]
+	or a, b
+	ret nz
+
+	ld a, [input_index]
+	ld [first_basement_floor], a
+	ld a, [input_index + 1]
+	ld [first_basement_floor + 1], a
+
 	ret
 
 VBlankHandler:
@@ -109,14 +129,19 @@ VBlankHandler:
 	push HL
 	
 	IncrementFrameCount
-	PrintByteHex current_frame, 0, 0
-	PrintByte current_frame, 0, 1
-	PrintByteHex current_floor, 0, 2
-	PrintByteHex current_floor + 1, 2, 2
+
+	PrintString part_1_string, 0, 1
+	PrintString part_2_string, 0, 2
+	;; PrintByteHex current_frame, 0, 0
+	;; PrintByte current_frame, 0, 1
+	;; PrintByteHex current_floor, 0, 2
+	;; PrintByteHex current_floor + 1, 2, 2
 	ld a, [done_flag]
 	cp a, 1
-	jr z, NotDone
+	jp nz, NotDone
 	PrintString done_string, 3, 3
+	PrintByte current_floor + 1, 8, 1
+        ;; PrintByte first_basement_floor + 1, 8, 2
 
 NotDone:	
 	pop HL
@@ -126,8 +151,9 @@ NotDone:
 	reti
 
 SECTION "High RAM", HRAM
-current_floor:	DS 2
-done_flag:	DS 1
+current_floor:		DS 2
+first_basement_floor:	DS 2
+done_flag:		DS 1
 
 SECTION "Input", ROM0
 input:
@@ -138,4 +164,10 @@ done_string:
 	db "Done", 0
 done_string_end:	
 
+part_1_string:	db "Part 1: "
+part_1_string_end:
+
+part_2_string:	db "Part 2: "
+part_2_string_end:
+
 INCLUDE "lib/tiles.asm"

gb/bin/run

@@ -13,7 +13,9 @@ fi
 
 set -e
 
-rgbasm  -o $year/$day/main.o  $source_file -H -Wall
+rgbgfx -o lib/text.2bpp lib/text.png
+
+rgbasm  -o $year/$day/main.o  $source_file -H -Wall -E
 rgblink -o $year/$day/main.gb $year/$day/main.o
 rgbfix  -v -p 0xFF            $year/$day/main.gb