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lab7.s
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lab7.s
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AREA interrupts, CODE, READWRITE
EXPORT lab7
EXPORT FIQ_Handler
EXTERN pin_connect_block_setup_for_uart0
EXTERN uart_init
EXTERN read_character
EXTERN output_character
EXTERN read_string
EXTERN output_string
EXTERN div_and_mod
EXTERN illuminateLEDs
EXTERN illuminate_RGB_LED
EXTERN display_digit_on_7_seg
GAME_BOARD = " SCORE 000",10,10,10,13,\
" _____",10,13," ////Q/|",10,13,\
" /____/ |____",10,13," | | /////|",10,13,\
" |____|/___/ |____",10,13," /////| | //////|",\
10,13," /___/ |___|/____/ |_____",10,13," | | /////",\
"| | //////|",10,13," |___|/___/ |____|/____/ |____",10,13,\
" /////| | //////| | /////|",10,13," /___/ |___|/",\
"____/ |____|/___/ |____",10,13," | | /////| | //////|",\
" | /////|",10,13," |___|/___/ |____|/____/ |___|/___/ |",10,13,\
" /////| | //////| | /////| | /",10,13," /___/ |___|/",\
"____/ |____|/___/ |____|/",10,13," | | /////| |//////| | /",\
10,13," |____|/___/ |____/____/ |____|/",10,13," //////| | ///",\
"//| | /",10,13," /____/ |____|/___/ |____|/",10,13," | | /////",\
"| | /",10,13," |____|/___/ |____|/",10,13," //////| | /",10,13,\
"/____/ |____|/",10,13,"| | /",10,13,"|____|/",10,13,0
INTRO = " Welcome to ARM QBERT",10,10,10,13,"Instructions:",10,13,\
"Qbert is represented by a Q, balls are represented by a O, ",10,13,\
"the snake ball is a C, and the snake is an S.",10,10,13,\
"Use the w, a, s, d keys to move up, left, down, and right ",10,13,\
"respectively.",10,10,13,\
"Qbert starts the game with four lives. Getting hit by a ",10,13,\
"ball, or snake removes a life. Jumping off the side of the ",10,13,\
"pyramid also costs one one life.",10,10,13,\
"Unexplored squares are shaded with ////. Explore all squares",10,13,\
"to advance to the next level.",10,10,13,\
"The game is over after 2 minutes, or all four lives have ",10,13,\
"been lost.",10,10,13,\
"Press the space bar at anytime to exit the game.",10,10,13,\
"Press the ARM push button at anytime to pause the game.",10,13,\
"No inputs will be accepted until the game is unpaused by ",10,13,\
"pushing the ARM push button again.",10,10,13,\
"Press g at anytime to start a new game.",10,10,13,\
"Press g now to start...",10,13,0
GAME_OVER = " Game Over Score: 000",10,10,10,10,13,\
" Press g to play again",10,13,\
" Press space bar to exit",0
TEST_TIMER1 = " timer 1 ",10,13,0
ALIGN
Q_X_POSITION DCD 15 ; Starting x=15
Q_Y_POSITION DCD 5 ; Starting y=5
Q_DIRECTION DCD 0 ;0=none, 1=up, 2=left, 3=down, 4=right
Q_SQUARE DCD 1
BALL1_X_POSITION DCD 0
BALL1_Y_POSITION DCD 0
BALL1_DIRECTION DCD 0
BALL1_SQUARE DCD 0
BALL2_X_POSITION DCD 0
BALL2_Y_POSITION DCD 0
BALL2_DIRECTION DCD 0
BALL2_SQUARE DCD 0
SNAKEBALL_X_POSITION DCD 0
SNAKEBALL_Y_POSITION DCD 0
SNAKEBALL_DIRECTION DCD 0
SNAKEBALL_SQUARE DCD 0
SNAKE_X_POSITION DCD 0
SNAKE_Y_POSITION DCD 0
SNAKE_DIRECTION DCD 0
SNAKE_SQUARE DCD 0
LEVEL DCD 1
LIVES DCD 4
SQUARE
DCD 0 ; 0
DCD 0 ; 1
DCD 0 ; 2
DCD 0 ; 3
DCD 0 ; 4
DCD 0 ; 5
DCD 0 ; 6
DCD 0 ; 7
DCD 0 ; 8
DCD 0 ; 9
DCD 0 ; 10
DCD 0 ; 11
DCD 0 ; 12
DCD 0 ; 13
DCD 0 ; 14
DCD 0 ; 15
DCD 0 ; 16
DCD 0 ; 17
DCD 0 ; 18
DCD 0 ; 29
DCD 0 ; 20
DCD 0 ; 21
SCORE DCD 0
BLINK DCD 0
Q_MOVES DCD 1
INC_TIMER_FLAG DCD 0 ; 0=up to date, 1=needs to be updated
NUM_BALLS DCD 0
NUM_HALF_SECS DCD 0
IS_PAUSED DCD 0 ; 0=running, 1=paused
BALL1_FELL_OFF DCD 0 ; Set if falls off
BALL2_FELL_OFF DCD 0 ; Set if falls off
SNAKEBALL_FELL_OFF DCD 0 ; Set if falls off
IS_GAMEOVER_SCREEN DCD 0 ; Set when at game over screen
DISPLAY_CURSE DCD 0
Q_RECENTLY_HIT = 0 ; Set when Q has been hit
ALIGN
lab7
STMFD sp!, {lr}
;;;;;; TODO hide cursor????
BL uart_init
BL pin_connect_block_setup_for_uart0
BL interrupt_init
MOV r2, #0x0C ; ASCII 0x0C is for new page
BL output_character ; Clear the screen
; Seven-seg starts with a 0
MOV r4, #0
BL display_digit_on_7_seg
; RGB LED starts as white
MOV r4, #5
BL illuminate_RGB_LED ; Set RGB LCD to white
; Display intro/instructions
LDR r3, =INTRO
BL output_string
; Loop at intro screen until player starts a new game or quits
endlessLoop
ADD r0, r0, #0 ; NOP
B endlessLoop
newGame
STMFD SP!, {r0-r5, r9, lr} ; Save registers
MOV r2, #0x0C ; ASCII 0x0C is for new page
BL output_character ; Clear the screen
; is no longer at the game over screen
LDR r0, =IS_GAMEOVER_SCREEN ; clear variable
MOV r1, #0
STRB r1, [r0]
; set ball 1 and 2, snakeball and snake to no square
LDR r0, =BALL1_SQUARE
MOV r1, #0
STR r1, [r0]
; set ball2 to no square
LDR r0, =BALL2_SQUARE
STR r1, [r0]
; set snakeball to no square
LDR r0, =SNAKEBALL_SQUARE
STR r1, [r0]
; set snake to no square
LDR r0, =SNAKE_SQUARE
STR r1, [r0]
; Do not continue to blink after a new game is started
LDR r0, =BLINK
MOV r1, #0
STR r1, [r0]
; Reset 2s spawn timer to 0
LDR r4, =NUM_HALF_SECS
MOV r5, #0
STR r5, [r4]
; Reset SCORE to 0
LDR r4, =SCORE
MOV r5, #0
STR r5, [r4]
; Reset NUM_BALLS to 0
LDR r4, =NUM_BALLS
MOV r5, #0
STR r5, [r4]
; Reset all SQUAREs to 0
BL resetAllSquares
; Reset LEVEL to 1
LDR r4, =LEVEL
MOV r5, #1
STR r5, [r4]
; Reset LIVES to 4
LDR r4, =LIVES ; Set the LIVES to 4
MOV r5, #4
STR r5, [r4]
MOV r4, #1
BL display_digit_on_7_seg ; Display current level (1)
MOV r4, #1
BL illuminate_RGB_LED ; Set RGB LCD to green when game running
; turn all four leds on
MOV r4, #0x00
BL illuminateLEDs ; Set all 4 LCDs to on
; Reset Q to starting position
LDR r4, =Q_X_POSITION
MOV r5, #15
STR r5, [r4] ; store new xPos
LDR r4, =Q_Y_POSITION
MOV r5, #5
STR r5, [r4] ; store new yPos
; Reset Q_DIRECTION to 0 = none
LDR r4, =Q_DIRECTION
MOV r5, #0
STR r5, [r4] ; store new direction
; Display the game board
LDR r3, =GAME_BOARD
BL output_string
; Enable timer0
LDR r2, =0xE000401C ; Address of Match Register 0 (MR0)
;LDR r0, =36864000 ; timeout period of the timer (2s)
;LDR r0, =18432000 ; timeout period of the timer (1s)
LDR r0, =9216000 ; timeout period of the timer (0.5s)
;LDR r0, =8755200 ; timeout period of the timer (0.45s)
STR r0, [r2]
LDR r0, =0xE0004004 ; (T0TCR) Timer 0 timer control reg
LDR r1, [r0]
ORR r1, r1, #1 ; set bit 0 to 1 to enable, or 0 to disable
STR r1, [r0]
; Enable timer1
LDR r2, =0xE000801C ; Address of Match Register 1 (MR1)
;LDR r0, =36864000 ; timeout period of the timer (2s)
;LDR r0, =92160000 ; timeout period of the timer (5s)
LDR r0, =2211840000 ; timeout period of the timer (120s)
STR r0, [r2]
LDR r0, =0xE0008004 ; (T1TCR) Timer 1 timer control reg
LDR r1, [r0]
ORR r1, r1, #1 ; set bit 0 to 1 to enable, or 0 to disable
STR r1, [r0]
BL interrupt_init
LDMFD SP!, {r0-r5, r9, lr} ; Restore registers
BX lr
resetAllSquares
STMFD SP!, {r0-r5, lr} ; Save registers
; Reset all SQUAREs to 0
LDR r3, =SQUARE
MOV r5, #0
resetNextSquare
; Clear SQUARE to reset
MOV r2, #0
STR r2, [r3, r5, LSL #2 ]
ADD r5, r5, #1
CMP r5, #22
BLT resetNextSquare
LDMFD SP!, {r0-r5, lr} ; Restore registers
BX lr
;;;;; TODO PURPLE AT GAME OVER
gameOver
STMFD SP!, {r0-r3, lr} ; Save registers
MOV r2, #0x0C ; ASCII 0x0C is for new page
BL output_character ; Clear the screen
; Display Game Over screen
LDR r3, =GAME_OVER
BL output_string
; Update score += lives left * 25
LDR r0, =LIVES
LDR r1, [r0]
MOV r2, #25
MUL r2, r1, r2
LDR r0, =SCORE
LDR r1, [r0]
ADD r1, r2, r1
STR r1, [r0]
BL updateScore
;BL interrupt_init
; Disable timer0
LDR r0, =0xE0004004 ; (T0TCR) Timer 0 timer control reg
LDR r1, [r0]
AND r1, r1, #0 ; set bit 0 to 1 to enable, or 0 to disable
STRB r1, [r0]
; Disable timer1
LDR r0, =0xE0008004 ; (T1TCR) Timer 1 timer control reg
LDR r1, [r0]
AND r1, r1, #0 ; set bit 0 to 1 to enable, or 0 to disable
STRB r1, [r0]
LDR r0, =IS_GAMEOVER_SCREEN ; set for game over screen
MOV r1, #1
STRB r1, [r0]
LDMFD SP!, {r0-r3, lr} ; Restore registers
BX lr
increaseLevel
STMFD SP!, {r0-r5, lr} ; Save registers
; THIS DOESNT WORK
; pause the game while increaseing the level
LDR r0, =IS_GAMEOVER_SCREEN
MOV r1, #1
STRB r1, [r0]
; Increase level by one and update 7-seg display
LDR r0, =LEVEL
LDR r4, [r0]
ADD r4, r4, #1
STR r4, [r0]
BL display_digit_on_7_seg ; Display current level (takes arg in r4)
; Update score +100
LDR r3, =SCORE
LDR r2, [r3]
ADD r2, r2, #100 ; Player gets 100 points for completing a level
STR r2, [r3]
; Reset Q to starting position
LDR r4, =Q_X_POSITION
MOV r5, #15
STR r5, [r4] ; store new xPos
LDR r4, =Q_Y_POSITION
MOV r5, #5
STR r5, [r4] ; store new yPos
; Reset Q_DIRECTION to 0 = none
LDR r4, =Q_DIRECTION
MOV r5, #0
STR r5, [r4] ; store new direction
; set ball1 to no square
LDR r0, =BALL1_SQUARE
MOV r1, #0
STR r1, [r0]
; set ball2 to no square
LDR r0, =BALL2_SQUARE
STR r1, [r0]
; Display the game board
MOV r2, #0x0C ; ASCII 0x0C is for new page
BL output_character ; Clear the screen
LDR r3, =GAME_BOARD
BL output_string
; Set flag to increase speed
LDR r4, =INC_TIMER_FLAG
MOV r5, #1
STR r5, [r4]
; TODO clear balls and snakes and rest spawns
; Reset 2s spawn timer to 0
LDR r4, =NUM_HALF_SECS
MOV r5, #0
STR r5, [r4]
; Number of balls -= 1
LDR r4, =NUM_BALLS
LDR r5, [r4]
SUB r5, r5, #1
STR r5, [r4]
; Reset all SQUAREs to 0
BL resetAllSquares
; THIS DOESNT WORK
; unpause the game after increasing level
LDR r0, =IS_GAMEOVER_SCREEN
MOV r1, #0
STRB r1, [r0]
LDMFD SP!, {r0-r5, lr} ; Restore registers
BX lr
removeQ
STMFD SP!, {r0-r5, lr} ; Save registers
LDR r4, =Q_X_POSITION
LDR r5, =Q_Y_POSITION
MOV r2, #0x1B ; ESC
BL output_character
MOV r2, #0x5B ; [
BL output_character
MOV r1, #10 ; divisor
LDR r0, [r5] ; dividend
BL div_and_mod
MOV r2, r0 ; quotient = xPos tens digit
ADD r2, r2, #0x30 ; convert to ascii
BL output_character
MOV r2, r1 ; remiander = xPos ones digit
ADD r2, r2, #0x30 ; convert to ascii
BL output_character
MOV r2, #0x3B ; ;
BL output_character
MOV r1, #10 ; divisor
LDR r0, [r4] ; dividend
BL div_and_mod
MOV r2, r0 ; quotient = yPos tens digit
ADD r2, r2, #0x30 ; convert to ascii
BL output_character
MOV r2, r1 ; remiander = yPos ones digit
ADD r2, r2, #0x30 ; convert to ascii
BL output_character
MOV r2, #0x66 ; f
BL output_character
MOV r2, #0x20 ; space
BL output_character
BL interrupt_init
LDMFD SP!, {r0-r5, lr} ; Restore registers
BX lr ; Return
redrawQ
STMFD SP!, {r0-r8, lr} ; Save registers
LDR r3, =Q_DIRECTION
LDR r8, [r3]
LDR r4, =Q_X_POSITION
LDR r6, [r4]
LDR r5, =Q_Y_POSITION
LDR r7, [r5]
CMP r8, #0 ; direction = none
BEQ savePosition
CMP r8, #1 ; direction = up
ADDEQ r6, r6, #2 ; new x = x+2
SUBEQ r7, r7, #4 ; new y = y-4
BEQ savePosition
CMP r8, #2 ; direction = left
SUBEQ r6, r6, #5 ; new x = x-5
SUBEQ r7, r7, #2 ; new y = y-2
BEQ savePosition
CMP r8, #3 ; direction = down
SUBEQ r6, r6, #2 ; new x = x-2
ADDEQ r7, r7, #4 ; new y = y+4
BEQ savePosition
CMP r8, #4 ; direction = right
ADDEQ r6, r6, #5 ; new x = x+5
ADDEQ r7, r7, #2 ; new y = y+2
savePosition
STR r6, [r4] ; store new xPos
STR r7, [r5] ; store new yPos
; draw a Q
MOV r2, #0x1B ; ESC
BL output_character
MOV r2, #0x5B ; [
BL output_character
MOV r1, #10 ; divisor
MOV r0, r7 ; dividend
BL div_and_mod
MOV r2, r0 ; quotient = xPos tens digit
ADD r2, r2, #0x30 ; convert to ascii
BL output_character
MOV r2, r1 ; remiander = xPos ones digit
ADD r2, r2, #0x30 ; convert to ascii
BL output_character
MOV r2, #0x3B ; ;
BL output_character
MOV r1, #10 ; divisor
MOV r0, r6 ; dividend
BL div_and_mod
MOV r2, r0 ; quotient = yPos tens digit
ADD r2, r2, #0x30 ; convert to ascii
BL output_character
MOV r2, r1 ; remiander = yPos ones digit
ADD r2, r2, #0x30 ; convert to ascii
BL output_character
MOV r2, #0x66 ; f
BL output_character
MOV r2, #0x51 ; Q
BL output_character
LDR r0, =Q_X_POSITION
LDR r2, =Q_SQUARE
BL updateSquare
; Only clear the square if player has lives left
; this is to prevent spaces in game over screen
LDR r3, =LIVES
LDR r4, [r3]
CMP r4, #0
BLNE clearSquare
; Check if all spaces cleared to see if player reached next level
LDR r3, =SQUARE
MOV r5, #1 ;2
nextSquare
LDR r4, [r3, r5, LSL #2]
CMP r4, #0 ; 0 if not cleared
BEQ notClear
ADD r5, r5, #1
CMP r5, #22
BLT nextSquare
BL increaseLevel
notClear
BL interrupt_init
LDMFD SP!, {r0-r8, lr} ; Restore registers
BX lr ; Return
;r0=objects x position
;r2=objects square
updateSquare
STMFD SP!, {r5, lr} ; Save registers
LDR r5, [r0]
CMP r5, #15
MOVEQ r1, #1
BEQ doneSquare
CMP r5, #13
MOVEQ r1, #2
BEQ doneSquare
CMP r5, #20
MOVEQ r1, #3
BEQ doneSquare
CMP r5, #11
MOVEQ r1, #4
BEQ doneSquare
CMP r5, #18
MOVEQ r1, #5
BEQ doneSquare
CMP r5, #25
MOVEQ r1, #6
BEQ doneSquare
CMP r5, #9
MOVEQ r1, #7
BEQ doneSquare
CMP r5, #16
MOVEQ r1, #8
BEQ doneSquare
CMP r5, #23
MOVEQ r1, #9
BEQ doneSquare
CMP r5, #30
MOVEQ r1, #10
BEQ doneSquare
CMP r5, #7
MOVEQ r1, #11
BEQ doneSquare
CMP r5, #14
MOVEQ r1, #12
BEQ doneSquare
CMP r5, #21
MOVEQ r1, #13
BEQ doneSquare
CMP r5, #28
MOVEQ r1, #14
BEQ doneSquare
CMP r5, #35
MOVEQ r1, #15
BEQ doneSquare
CMP r5, #5
MOVEQ r1, #16
BEQ doneSquare
CMP r5, #12
MOVEQ r1, #17
BEQ doneSquare
CMP r5, #19
MOVEQ r1, #18
BEQ doneSquare
CMP r5, #26
MOVEQ r1, #19
BEQ doneSquare
CMP r5, #33
MOVEQ r1, #20
BEQ doneSquare
CMP r5, #40
MOVEQ r1, #21
BEQ doneSquare
BL fallOff ; Q/enemy is off pyramid if not on a square
B offSquare
doneSquare
STR r1, [r2] ; Store the new square
offSquare
LDMFD SP!, {r5, lr} ; Restore registers
BX lr
;r0=objects x position
;r2=objects square
fallOff
STMFD SP!, {r4-r5, lr} ; Save registers
; Check if Q, or ball fell off pyramid
LDR r1, =Q_X_POSITION
CMP r0, r1
BEQ qFell
LDR r1, =SNAKEBALL_X_POSITION
CMP r0, r1
BEQ snakeBallFell
LDR r1, =BALL2_X_POSITION
CMP r0, r1
BEQ ball2Fell
LDR r4, =BALL1_FELL_OFF ; set O_FELL_OFF
MOV r5, #1
STR r5, [r4]
BL removeBall1
B oFell
snakeBallFell
LDR r4, =SNAKEBALL_FELL_OFF ; set SANKEBALL_FELL_OFF
MOV r5, #1
STR r5, [r4]
BL removeSnakeBall
B oFell
ball2Fell
LDR r4, =BALL2_FELL_OFF ; set O_FELL_OFF
MOV r5, #1
STR r5, [r4]
BL removeBall2
B oFell
qFell
BL removeQ
; Reset Q to starting position
LDR r4, =Q_X_POSITION
MOV r5, #15
STR r5, [r4] ; store new xPos
LDR r4, =Q_Y_POSITION
MOV r5, #5
STR r5, [r4] ; store new yPos
; Reset Q_DIRECTION to 0 = none
LDR r4, =Q_DIRECTION
MOV r5, #0
STR r5, [r4] ; store new direction
BL removeLife
oFell
LDMFD SP!, {r4-r5, lr} ; Restore registers
BX lr
removeLife
STMFD SP!, {r3-r5, lr} ; Save registers
; Blink RGB LED red 5 times
; Set BLINK to 10 which will be decremented 10 times and
; blink each time
LDR r3, =BLINK
MOV r5, #10
STR r5, [r3] ; store new BLINK
BL blinkOnDeath
; Remove a life
LDR r3, =LIVES
LDR r5, [r3]
SUB r5, #1
STR r5, [r3]
; Update lives LEDs
CMP r5, #3
LDREQ r4, =0x10000 ;turn 3 leds on
CMP r5, #2
LDREQ r4, =0x30000 ;turn 2 leds on
CMP r5, #1
LDREQ r4, =0x70000 ;turn 1 leds on
CMP r5, #0
LDREQ r4, =0xF0000 ;turn 0 leds on
BL illuminateLEDs
CMP r5, #0
BLEQ gameOver
CMP r5, #0
BEQ qDead ; Do not need to update new Q position if game over
BL redrawQ
qDead
LDMFD SP!, {r3-r5, lr} ; Restore registers
BX lr
blinkOnDeath
STMFD SP!, {r0-r5, lr} ; Save registers
LDR r3, =BLINK ; check if BLINK is 0
LDR r5, [r3]
CMP r5, #0
MOVEQ r4, #1 ; Set RGB back to green when zero
BEQ noBlinks ; if BLINK is 0 do not blink
; If BLINK is non-zero check if even or odd
MOV r1, #2 ; divisor
MOV r0, r5 ; dividend
BL div_and_mod
CMP r1, #0 ; even if remainder = 0
MOVEQ r4, #0 ; SET RGB LED to red when even
MOVGT r4, #6 ; Set RGB LED to off when odd
; Decrement BLINK
SUB r5, r5, #1
STR r5, [r3]
noBlinks
BL illuminate_RGB_LED
LDMFD SP!, {r0-r5, lr} ; Restore registers
BX lr
clearSquare
STMFD SP!, {r3-r5, lr} ; Save registers
LDR r3, =Q_SQUARE
LDR r4, [r3]
CMP r4, #1
BLEQ clearLLL
CMP r4, #2
BLEQ clearLL
CMP r4, #3
BLEQ clearLL
CMP r4, #5
BLEQ clearLL
CMP r4, #4
BLEQ clearLR
CMP r4, #7
BLEQ clearLR
CMP r4, #8
BLEQ clearLR
CMP r4, #12
BLEQ clearLR
CMP r4, #15
BLEQ clearLR
CMP r4, #17
BLEQ clearLR
CMP r4, #18
BLEQ clearLR
CMP r4, #20
BLEQ clearLR
CMP r4, #21
BLEQ clearLR
CMP r4, #9
BLEQ clearLLR
CMP r4, #10
BLEQ clearLLR
CMP r4, #11
BLEQ clearLLR
CMP r4, #13
BLEQ clearLLR
CMP r4, #16
BLEQ clearLLR
CMP r4, #19
BLEQ clearLLR
CMP r4, #6
BLEQ clearLLL
CMP r4, #14
BLEQ clearLRR
LDMFD SP!, {r3-r5, lr} ; Restore registers
BX lr
LTORG ; Literal poop too distant
clearLL
STMFD SP!, {r2-r6, lr} ; Save registers
; Check if space is already clear
LDR r3, =SQUARE
LDR r4, =Q_SQUARE
LDR r5, [r4]
MOV r5, r5, LSL #2
LDR r6, [r3, r5]
CMP r6, #0 ; 0 if not cleared
BNE alreadyClrLL
; Move curosr left 3, and write 2 spaces
MOV r2, #0x1B ; ESC
BL output_character
MOV r2, #0x5B ; [
BL output_character
MOV r2, #0x33 ; 3
BL output_character
MOV r2, #0x44 ; D
BL output_character
MOV r2, #0x20 ; space
BL output_character
MOV r2, #0x20 ; space
BL output_character
; Set SQUARE to show its already been cleared
MOV r2, #1
STR r2, [r3, r5]
; Update SCORE
LDR r3, =SCORE
LDR r2, [r3]
ADD r2, r2, #10 ; Player gets 10 point for unexplored square
STR r2, [r3]
alreadyClrLL
LDMFD SP!, {r2-r6, lr} ; Restore registers
BX lr
clearLR
STMFD SP!, {r2-r6, lr} ; Save registers
; Check if space is already clear
LDR r3, =SQUARE
LDR r4, =Q_SQUARE
LDR r5, [r4]
MOV r5, r5, LSL #2
LDR r6, [r3, r5]
CMP r6, #0 ; 0 if not cleared
BNE alreadyClrLR
; Move curosr left 2, and write 1 space
MOV r2, #0x1B ; ESC
BL output_character
MOV r2, #0x5B ; [
BL output_character
MOV r2, #0x32 ; 2
BL output_character
MOV r2, #0x44 ; D
BL output_character
MOV r2, #0x20 ; space
BL output_character
; Move cursor right 1, and write 1 space
MOV r2, #0x1B ; ESC
BL output_character
MOV r2, #0x5B ; [
BL output_character
MOV r2, #0x31 ; 1
BL output_character
MOV r2, #0x43 ; C
BL output_character
MOV r2, #0x20 ; space
BL output_character
; Set SQUARE to show its already been cleared
MOV r2, #1
STR r2, [r3, r5]
; Update SCORE
LDR r3, =SCORE
LDR r2, [r3]
ADD r2, r2, #10 ; Player gets 10 point for unexplored square
STR r2, [r3]
alreadyClrLR
LDMFD SP!, {r2-r6, lr} ; Restore registers
BX lr
clearLLR
STMFD SP!, {r2-r6, lr} ; Save registers
LDR r3, =SQUARE
LDR r4, =Q_SQUARE
LDR r5, [r4]
MOV r5, r5, LSL #2
LDR r6, [r3, r5]
CMP r6, #0 ; 0 if not cleared
BNE alreadyClrLLR
; Move curosr left 3, and write 2 spaces
MOV r2, #0x1B ; ESC
BL output_character
MOV r2, #0x5B ; [
BL output_character
MOV r2, #0x33 ; 3
BL output_character
MOV r2, #0x44 ; D
BL output_character
MOV r2, #0x20 ; space
BL output_character
MOV r2, #0x20 ; space
BL output_character
; Move cursor right 1, and write 1 space
MOV r2, #0x1B ; ESC
BL output_character
MOV r2, #0x5B ; [
BL output_character
MOV r2, #0x31 ; 1
BL output_character
MOV r2, #0x43 ; C
BL output_character
MOV r2, #0x20 ; space
BL output_character
; Set SQUARE to show its already been cleared
MOV r2, #1
STR r2, [r3, r5]
; Update SCORE
LDR r3, =SCORE
LDR r2, [r3]
ADD r2, r2, #10 ; Player gets 10 point for unexplored square
STR r2, [r3]
alreadyClrLLR
LDMFD SP!, {r2-r6, lr} ; Restore registers
BX lr
clearLLL
STMFD SP!, {r2-r6, lr} ; Save registers
LDR r3, =SQUARE
LDR r4, =Q_SQUARE
LDR r5, [r4]
MOV r5, r5, LSL #2
LDR r6, [r3, r5]
CMP r6, #0 ; 0 if not cleared
BNE alreadyClrLLL
; Move curosr left 4, and write 3 spaces
MOV r2, #0x1B ; ESC
BL output_character
MOV r2, #0x5B ; [
BL output_character
MOV r2, #0x34 ; 4
BL output_character
MOV r2, #0x44 ; D
BL output_character
MOV r2, #0x20 ; space
BL output_character
MOV r2, #0x20 ; space
BL output_character
MOV r2, #0x20 ; space
BL output_character
; Set SQUARE to show its already been cleared
MOV r2, #1
STR r2, [r3, r5]
; Update SCORE
LDR r3, =SCORE
LDR r2, [r3]
ADD r2, r2, #10 ; Player gets 10 point for unexplored square
STR r2, [r3]
alreadyClrLLL
LDMFD SP!, {r2-r6, lr} ; Restore registers
BX lr
clearLRR
STMFD SP!, {r2-r6, lr} ; Save registers
LDR r3, =SQUARE
LDR r4, =Q_SQUARE
LDR r5, [r4]
MOV r5, r5, LSL #2
LDR r6, [r3, r5]
CMP r6, #0 ; 0 if not cleared
BNE alreadyClrLRR
; Move curosr left 2, and write 1 spaces
MOV r2, #0x1B ; ESC
BL output_character
MOV r2, #0x5B ; [
BL output_character
MOV r2, #0x32 ; 2
BL output_character
MOV r2, #0x44 ; D
BL output_character
MOV r2, #0x20 ; space
BL output_character
; Move cursor right 1, and write 2 space
MOV r2, #0x1B ; ESC
BL output_character
MOV r2, #0x5B ; [
BL output_character
MOV r2, #0x31 ; 1
BL output_character
MOV r2, #0x43 ; C
BL output_character
MOV r2, #0x20 ; space
BL output_character
MOV r2, #0x20 ; space
BL output_character
; Set SQUARE to show its already been cleared
MOV r2, #1
STR r2, [r3, r5]
; Update SCORE
LDR r3, =SCORE
LDR r2, [r3]
ADD r2, r2, #10 ; Player gets 10 point for unexplored square
STR r2, [r3]
alreadyClrLRR
LDMFD SP!, {r2-r6, lr} ; Restore registers
BX lr
updateScore
STMFD SP!, {r2-r4, lr} ; Save registers
MOV r2, #0x1B ; ESC
BL output_character
MOV r2, #0x5B ; [
BL output_character
MOV r2, #1 ; move to line 1
BL output_character
MOV r2, #0x3B ; ;
BL output_character
MOV r2, #0x33 ; move to column 39
BL output_character
MOV r2, #0x39
BL output_character
MOV r2, #0x66 ; f
BL output_character
; Redraw SCORE
LDR r3, =SCORE
LDR r4, [r3]
MOV r1, #1000 ; divisor
MOV r0, r4 ; dividend
BL div_and_mod
MOV r2, r0 ; quotient = thousands digit
ADD r2, r2, #0x30 ; convert to ascii
BL output_character
MOV r0, r1 ; Move remainder to dividend
MOV r1, #100 ; divisor
BL div_and_mod
MOV r2, r0 ; quotient = hundreds digit
ADD r2, r2, #0x30 ; convert to ascii
BL output_character
MOV r0, r1 ; Move remainder to dividend
MOV r1, #10 ; divisor
BL div_and_mod
MOV r2, r0 ; quotient = tens digit
ADD r2, r2, #0x30 ; convert to ascii
BL output_character
MOV r2, r1 ; remiander = ones digit
ADD r2, r2, #0x30 ; convert to ascii
BL output_character
LDMFD SP!, {r2-r4, lr} ; Restore registers
BX lr
spawnEnemy
STMFD SP!, {r2-r4, lr} ; Save registers
; dont spawn an enemy if one is currently at square 2 or 3
LDR r2, =BALL1_SQUARE
LDR r1, [r2]
CMP r1, #2
BEQ noSpawn
CMP r1, #3
BEQ noSpawn
LDR r2, =BALL2_SQUARE
LDR r1, [r2]
CMP r1, #2
BEQ noSpawn
CMP r1, #3
BEQ noSpawn
LDR r2, =SNAKEBALL_SQUARE
LDR r1, [r2]
CMP r1, #2
BEQ noSpawn
CMP r1, #3