Mercurial > vba-clojure

     1 (ns com.aurellem.gb.rlm-assembly

     2   "Version of main bootstrap program that is valid output for the

     3    item-writer program."

     4   (:use (com.aurellem.gb gb-driver assembly util vbm constants))

     5   (:use (com.aurellem.run bootstrap-1))

     6   (:import [com.aurellem.gb.gb_driver SaveState]))

     7 

     8 

     9 ;; MODE-SELECT

    10 ;; SET-LENGTH

    11 ;; SET-TARGET

    12 ;; WRITE

    13 ;; JUMP

    14 

    15 ;; Specs for Main Bootstrap Program

    16 

    17 ;; Number-Input

    18 ;; Number input works using all eight buttons to

    19 ;;   spell out an 8 bit number.  The order of buttons is

    20 ;;   [:d :u :l :r :start :select :b :a]  -->  11111111

    21 ;;   [      :l    :start            :a]  -->  00101001

    22 

    23 ;;; MODE-SELECT

    24 ;;   The bootstrap program starts in MODE-SELECT mode.

    25 ;;   MODE-SELECT transitions to one of three modes depending

    26 ;;   on which buttons are pressed:

    27 ;;       0   (no-buttons)  :  MODE-SELECT

    28 ;;       8   [:start]      :  WRITE-BYTES

    29 ;;    0xFF   (all-buttons) :  JUMP

    30 

    31 ;;; WRITE-BYTES

    32 

    33 ;;   WRITE-BYTES mode writes sequences of arbitray values to

    34 ;;   arbitray memory locations. It expects you to enter a

    35 ;;   header of three bytes describing what to write:

    36 

    37 ;;    Byte 0  : Number of Bytes to Write

    38 ;;    Byte 1  : Start Address High Byte

    39 ;;    Byte 1  : Start Address Low  Byte

    40 

    41 ;;   Then, you enter the number of bytes specified in Byte 0

    42 ;;   they are written to the start address in

    43 ;;   sequence. After the last byte is written control

    44 ;;   returns to MODE-SELECT mode.

    45 

    46 ;;   Example: to write the sequence [1 2 3 4] starting at

    47 ;;   address 0xC01F enter

    48 ;;    Byte 0  : 4 (will write four bytes)

    49 ;;    Byte 1  : 0xC0  (high byte of 0xC01F)

    50 ;;    Byte 2  : 0x1F  (low  byte of 0xC01F)

    51 ;;    Byte 3  : 1 (write 1 to 0xC01F)

    52 ;;    Byte 4  : 2 (write 2 to 0xC020)

    53 ;;    Byte 5  : 3 (write 3 to 0xC021)

    54 ;;    Byte 6  : 4 (write 4 to 0xC022)

    55 

    56 ;;; JUMP 

    57 ;;   JUMP mode jumps program control to any arbitray

    58 ;;   location. It expects you to enter two bytes which

    59 ;;   correspond to the high and low bytes of the memory

    60 ;;   address to which you want to jump.

    61 ;;    Byte 0  : Jump Address High Byte

    62 ;;    Byte 1  : Jump Address Low  Byte

    63 

    64 ;;   Example: to jump to address 0x1234 enter

    65 ;;    Byte 0  : 0x12 (high byte of 0x1234)

    66 ;;    Byte 1  : 0x34 (low  byte of 0x1234)

    67 

    68 

    69 (defn ->signed-8-bit [n]

    70   (if (< n 0)

    71     (+ 256 n) n))

    72 

    73 (defn frame-metronome []

    74   (let [init [0xC5] ;; save value of BC

    75         timing-loop

    76         [0x01 ; \

    77          0x43 ;  |

    78          0xFE ;  |  load 0xFF44 into BC without repeats

    79          0x0C ;  |

    80          0x04 ; /

    81          0x0A] ;; (BC) -> A, now A = LY (vertical line coord)

    82         continue-if-144

    83         [0xFE

    84          144     ;; compare LY (in A) with 144

    85          0x20    ;; jump back to beginning if LY != 144 (not-v-blank)

    86          (->signed-8-bit

    87           (+ -4 (- (count timing-loop))))]

    88         spin-loop

    89         [0x05 ;; dec B, which is 0xFF

    90          0x20 ;; spin until B==0

    91          0xFD]]

    92     (concat init timing-loop continue-if-144 spin-loop)))

    93 

    94 (defn test-frame-metronome

    95   "Ensure that frame-metronome ticks exactly once every frame."

    96   ([] (test-frame-metronome 151))

    97   ([steps]

    98      (let [inc-E [0x1C 0x18

    99                   (->signed-8-bit

   100                    (+ -3 (- (count (frame-metronome)))))]

   101            program (concat (frame-metronome) inc-E)

   102            count-frames

   103            (-> (tick (mid-game))

   104                (IE! 0)

   105                (DE! 0)

   106                (set-memory-range pokemon-list-start program)

   107                (PC! pokemon-list-start))

   108            E-after-moves

   109            (E (run-moves count-frames (repeat steps [])))]

   110        (println "E:" E-after-moves) 

   111        (assert (= steps E-after-moves))

   112 

   113        (println "E =" E-after-moves "after" steps "steps")

   114        count-frames)))

   115 

   116 (defn read-user-input []

   117   [0x3E

   118    0x20 ; prepare to measure d-pad

   119 

   120    0x01 ;\

   121    0x01 ; |

   122    0xFE ; |  load 0xFF00 into BC without repeats

   123    0x04 ; |

   124    0x0D ;/

   125    

   126    0x02 

   127    0x0A ;; get D-pad info

   128    

   129    0xF5 ;; push AF

   130       

   131    0x3E

   132    0x10 ; prepare to measure buttons

   133 

   134    0x3F ;; clear carry flag no-op to prevent repeated nybbbles

   135    

   136    0x02

   137    0x0A ;; get button info

   138    

   139    0xE6 ;; select bottom bits of A

   140    0x0F

   141 

   142    0x47 ;; A->B

   143 

   144    0xF1 ;; pop AF

   145 

   146    0xE6

   147    0x0F ;; select bottom bits of A

   148 

   149    0xCB

   150    0x37 ;; swap A nybbles

   151 

   152    0xB0 ;; (or A B) -> A

   153  

   154    0x2F ;; (NOT A) -> A

   155    

   156    ])

   157 

   158 (defn test-read-user-input []

   159   (let [program

   160         (concat

   161          (frame-metronome) (read-user-input)

   162          [0x5F ;; A-> E

   163           0x18

   164           (->signed-8-bit

   165            (+ (- (count (frame-metronome)))

   166               (- (count (read-user-input)))

   167               (- 3)))])

   168         read-input

   169         (-> (tick (mid-game))

   170             (IE! 0)

   171             (set-memory-range pokemon-list-start program)

   172             (PC! pokemon-list-start))]

   173     (dorun

   174       (for [i (range 0x100)]

   175         (assert (= (E (step read-input (buttons i))) i))))

   176      (println "Tested all inputs.")

   177     read-input))

   178 

   179 (def symbol-index

   180   (fn [symbol sequence]

   181     (count (take-while

   182             (partial not= symbol)

   183             sequence))))

   184 

   185 

   186 (defn main-bootstrap-program [start-address]

   187   ;; Register Use:

   188   

   189   ;; ED non-volitale scratch

   190   

   191   ;; A  user-input

   192   ;; HL target-address

   193   ;; B  bytes-to-write

   194   ;; C  non-volatile scratch

   195 

   196   ;; Modes (with codes) are:

   197 

   198   ;; single-action-modes:

   199   ;; SET-TARGET-HIGH     0x67 ;; A->H

   200   ;; SET-TARGET-LOW      0x6F ;; A->L

   201   ;; JUMP                0xE9 ;; jump to (HL)

   202 

   203   ;; multi-action-modes

   204   ;; WRITE               0x47 ;; A->B

   205 

   206   (let [[start-high start-low] (disect-bytes-2 start-address)

   207         jump-distance (+ (count (frame-metronome))

   208                          (count (read-user-input)))

   209 

   210         init

   211         [0xAF 0x5F 0x57 0x47] ;; 0->A; 0->E; 0->D; 0->B

   212 

   213         input

   214         [0xC1  ;; pop BC so it's not volatile

   215 

   216          0x4F ;; A->C

   217          

   218          0xAF  ;; test for output-mode (bytes-to-write > 0)

   219          0xB8  ;; (cp A B)

   220 

   221          0x20       ;; skip input section if

   222          :to-output ;; we're not in input mode 

   223                   

   224          :to-be-executed

   225 

   226          ;; write mode to instruction-to-be-executed (pun)

   227          0xEA

   228          :to-be-executed-address

   229          0x18           ;; return

   230          :to-beginning-1]

   231         

   232         output

   233         [:output-start ;; just a label

   234          0x54 ;;

   235          0x5D ;; HL->DE  \

   236               ;;          |

   237          0x79 ;; C->A     | this mess is all to do 

   238          0x12 ;; A->(DE)  | 0x22 (LDI (HL), A) without

   239               ;;          | any repeating nybbles

   240          0x23 ;; inc HL  /

   241 

   242 

   243          0x05 ;; DEC bytes-to-write (B)

   244          0x20 ;; if there are no more bytes to write,

   245          0x04

   246          0xAF ;; put a no op (0x00) in to-be-executed

   247          0xEA

   248          :to-be-executed-address

   249                   

   250          0x18

   251          :to-beginning-2]

   252         

   253         symbols

   254         {:to-be-executed-address

   255          (reverse

   256           (disect-bytes-2

   257            (+ start-address jump-distance

   258               (count init)

   259               (symbol-index :to-be-executed input))))

   260          :to-be-executed 0x3F} ;; clear carry flag no-op

   261 

   262         program** (flatten

   263                   (replace

   264                    symbols

   265                    (concat init (frame-metronome)

   266                            (read-user-input)

   267                            input output)))

   268         resolve-internal-jumps

   269         {:output-start []

   270          :to-output

   271          (->signed-8-bit

   272           (- (symbol-index :output-start program**)

   273              (symbol-index :to-output program**)))}

   274 

   275         program*

   276         (flatten (replace resolve-internal-jumps program**))

   277         

   278         resolve-external-jumps

   279         {:to-beginning-1

   280          (->signed-8-bit

   281           (+ (count init)

   282              -2 (- (inc (symbol-index :to-beginning-1 program*)))))

   283          :to-beginning-2

   284          (->signed-8-bit

   285           (+ (count init)

   286            -2 (- (inc (symbol-index :to-beginning-2 program*)))))}

   287 

   288         program

   289         (replace resolve-external-jumps program*)]

   290     program))

   291         

   292     

   293 ;;;;;; TESTS ;;;;;;

   294 

   295 (defn bootstrap-base []

   296   (let [program (main-bootstrap-program pokemon-list-start)]

   297     ;; make sure program is valid output for item-writer

   298     ;;(bootstrap-pattern program)

   299     (-> (tick (mid-game))

   300         (set-memory-range pokemon-list-start program)

   301         (PC! pokemon-list-start))))

   302 

   303 (defn test-set-H [n]

   304   (let [after

   305         (-> (bootstrap-base)

   306             (step [])

   307             (step [])

   308             (step [])

   309             (step (buttons 0x67))

   310             (step (buttons n))

   311             (step [])

   312             (step [])

   313             (step []))]

   314     (hex (H after))))

   315 

   316 (defn test-write-bytes-mode []

   317   (let [target-address 0xC00F

   318         [target-high target-low] (disect-bytes-2 target-address)

   319         assembly [0xF3 0x18 0xFE 0x12]

   320         get-mem-region  #(subvec (vec (memory %))

   321                                  target-address (+ target-address 20))

   322         before (bootstrap-base)

   323         after

   324         (-> before

   325             (step [])           ; make sure it can handle blanks

   326             (step [])           ; at the beginning.

   327             (step [])                      

   328             (step [:start])     ; select WRITE-BYTES mode

   329             (step (buttons 4))  ; write 4 bytes

   330             (step (buttons target-high))

   331             (step (buttons target-low))

   332             (step (buttons (nth assembly 0)))

   333             (step (buttons (nth assembly 1)))

   334             (step (buttons (nth assembly 2)))

   335             (step (buttons (nth assembly 3)))

   336             (step [])

   337             (step [])

   338             (step []))]

   339             (println "before :" (get-mem-region before))

   340             (println "after  :" (get-mem-region after))

   341             (assert (= assembly (take 4 (get-mem-region after))))

   342     after))

   343 

   344 (defn test-jump-mode []

   345   (let [target-address 0xC00F

   346         [target-high target-low] (disect-bytes-2 target-address)

   347         post-jump

   348         (-> (test-write-bytes-mode)

   349             (step [])

   350             (step [])

   351             (step [])

   352             (step (buttons 0xFF))           ; Select JUMP mode.

   353             (step (buttons target-high))

   354             (step (buttons target-low)))

   355         program-counters

   356         (capture-program-counter 

   357          post-jump

   358          10000)]

   359     (println program-counters)

   360     (assert (contains? (set program-counters) target-address))

   361     post-jump))
author	Robert McIntyre <rlm@mit.edu>
date	Thu, 12 Apr 2012 01:25:28 -0500
parents	309614263aa9
children	5c0e12f0a833