LAB 3 PART 3

 Now that was a lot of code! as you can see I have had to separate the code into three posts. This program works by first executing two sub routines that are going to initialize the memory (init, loop)  which will set the game state and the loop is going to call the subroutines of the program and execute them in order before looping back and and repeating. I like the way this program is broken down into different sub routines like functions it makes it easier to follow.


I Changed the controls from the original and also added a way to add a second value called SnakeLengthTwo it increased the size by double but the issue was that when it was added is that from where the last apple was that was eaten the tail value stays at that location in memory and the snake moves but just grows at a rapid rate.


updateSnake:

  ldx snakeLength

 ldx snakeLengthTwo //this will make the snake tail stay at the same spot

  dex

  txa

updateloop:

  lda snakeHeadL,x

  sta snakeBodyStart,x

  dex

  bpl updateloop


  lda snakeDirection

  lsr

  bcs up

  lsr

  bcs right

  lsr

  bcs down

  lsr

  bcs left

up:

  lda snakeHeadL

  sec

  sbc #$20

  sta snakeHeadL

  bcc upup

  rts

upup:

  dec snakeHeadH

  lda #$1

  cmp snakeHeadH

  beq collision

  rts

right:

  inc snakeHeadL

  lda #$1f

  bit snakeHeadL

  beq collision

  rts

down:

  lda snakeHeadL

  clc

  adc #$20

  sta snakeHeadL

  bcs downdown

  rts

downdown:

  inc snakeHeadH

  lda #$6

  cmp snakeHeadH

  beq collision

  rts

left:

  dec snakeHeadL

  lda snakeHeadL

  and #$1f

  cmp #$1f

  beq collision

  rts

collision:

  jmp gameOver



drawApple:

  ldy #0

  lda sysRandom

  sta (appleL),y

  rts



drawSnake:

  ldx snakeLength

  lda #0

  sta (snakeHeadL,x) ; erase end of tail


  ldx #0

  lda #5

  sta (snakeHeadL,x) ; paint head

  rts



spinWheels:

  ldx #0

spinloop:

  nop

  nop

  dex

  bne spinloop

  rts



gameOver:

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