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;
; C51 Snakes ~~~~~~~~~
;
; Created by Sandeep Sasi
; Project Started: 10/09/09, 12:00PM
; Project Completed: 30/09/09, 02:10AM
; File: C51Snakes.asm
; Created by: Sandeep Sasi
$TITLE ('C51Snakes')
; This file defines the Main Block and the entry point of the app.
; The app. uses polling technique to sequentially montior the state of the
; keys and then bring about the appropriate response. Since there are no blocking
; modules and each module will complete executuion within a deterministic time
; period, polling tech. proves more efficient over others in implementing this logic!!!
ORG 0000H ; System reset sets PC to this addr.
SJMP ResetRecoveryISR ; After a sys. reset, pgm. exe. begins at this inst.
ORG 0003H
SJMP ExternalInterrupt0ISR
ORG 000BH ; Sets PC to this addr. when a Timer 0 overflow signal is raised
AJMP DisplayMuxISR ; Jump to the corresponding ISR's block
ORG 0013H
SJMP ExternalInterrupt1ISR
ORG 0020H ; All the supporting librarires are place in page one of ROM.
; The game library (EggHandle.inc, GameBackEnd.inc and GameFrontEnd.inc) and
; C51Snakes.asm will be moved to page two of ROM!!!
$INCLUDE (ConstAndDataDefs.inc) ; Program Conts.s, redefinition of SFRs and Variable defs.
$INCLUDE (SystemPower.inc) ; Functions that handle system power down & program recovery after a system reset
$INCLUDE (DisplayMuxing.inc) ; Function and ISR for Disp. Muxing.
$INCLUDE (SystemFunctions.inc) ; Fns. to ctrl. disp., buzzer, scan keypad and delay the execution
$INCLUDE (LowLevelGfx.inc) ; Fuctions that give pixel level access to the disp.
$INCLUDE (HighLevelGfx.inc) ; Function to clear screen, print text and draw line
$INCLUDE (WelcomeGfx.inc) ; Functions to display an animation when the console is switched on
$INCLUDE (DelaySettings.inc) ; Functions to adjust the speed (prop. delay) of the snake
$INCLUDE (StandByState.inc) ; Fuctions that are called when the app. enters stand by
$INCLUDE (PauseState.inc) ; Functions that are called when the game is paused
ORG 0801H ; The core game library functions; Beginning of page two of ROM
$INCLUDE (EggHandle.inc) ; Functions to handle generation and management of eggs for the snake
$INCLUDE (GameBackEnd.inc) ; Functions that not directly called from the Main block
; The core game logic is handled by these functions
$INCLUDE (GameFrontEnd.inc) ; Functions that are called from Main block to notify various states of the game
; Beginning of the Main Block
C51Main:
GameStandBy:
LCALL _StandBy ; Enter stand by
GameInit:
ACALL _NotifyGameBegin ; Initiate the operations before game begins
LCALL _WaitForAllActionKeyRelease
MOV PREV_KEY_STATES, #ALL_KEYS_PRESSED ; Force the user to release all keys
; to start processing them in the polling loop
LCALL _ResetSystemIdleTime
GameRun:
MOV CURR_KEY_STATES, KEYPAD_ACCESS_PORT ; Sample the state of all keys
TestForAnyKeyPress:
MOV A, #ANY_KEY_MASK
LCALL ADetectedDepressedStateOfKeyMaskInA
JNZ BeginKeyScan ; If a key press is detected, start scanning the keys sequentially
LCALL AStepSystemIdleTimeAndNotifyOnExpiry ; If not, advance that system idle time
JZ EndOfKeyScan ; If system idle period expires,
ACALL _NotifyGameFreeze ; then freeze the game and
LCALL _PowerDownSystem ; initiate system power down
ACALL _NotifyGameRestore ; Recover game from power down state
LCALL _WaitForAnyKeyPress ; Wait for a user event
MOV CURR_KEY_STATES, #ALL_KEYS_PRESSED
SJMP EndOfKeyScan
BeginKeyScan:
LCALL _ResetSystemIdleTime
ScanGamePauseKey:
MOV A, #PAUSE_KEY_MASK
LCALL ADetectedDepressingEdgeOfKeyMaskInA ; Check whether the pause key is hit
JZ ScanDelaySettingsKey ; If not, check the state of Delay Settings key
ACALL _NotifyGameFreeze ; If yes, initiate a game freeze
LCALL AGamePause ; Enter paused state
JZ GameEnd; If the user wishes to quit, end the game and
; display the game score
ACALL _NotifyGameRestore ; Else, initiate game resume
LCALL _WaitForAnyKeyPress ; After restoring the display to the state when the user
; hit the pause key, wait for a user event
MOV CURR_KEY_STATES, #ALL_KEYS_PRESSED
SJMP EndOfKeyScan ; Perform no more key processing in this iteration
ScanDelaySettingsKey:
MOV A, #DEL_SET_KEY_MASK
LCALL ADetectedDepressingEdgeOfKeyMaskInA ; Check whether the pause key is hit
JZ ScanGameActionKeys ; If not, check the state of Game Action Keys
ACALL _NotifyGameFreeze ; If yes, initiate a game freeze
LCALL _DelaySettings ; Enter the mode that helps the user to adjust the snake's speed
ACALL _NotifyGameRestore ; Restore the game once the user has switched back to game mode
LCALL _WaitForAnyKeyPress ; After restoring the display to the state when the user
; hit the pause key, wait for a user event
MOV CURR_KEY_STATES, #ALL_KEYS_PRESSED
SJMP EndOfKeyScan ; Perform no more key processing in this iteration
ScanGameActionKeys:
ACALL _ScanGameActionKeys
EndOfKeyScan:
MOV PREV_KEY_STATES, CURR_KEY_STATES ; Init. PREV_KEY_STATES before next round of processing
MOV A, #GAME_TIME_STEP_PERIOD
LCALL _DelayABy100ms
ACALL ANotifyGameTimeStep ; Initiate a change of game state
JZ GameOver ; Collision detected; So, game over!
SJMP GameRun ; Loop around to Game Block
GameOver:
ACALL _EndOfGameGfx ; Alert user about end of the game
GameEnd:
ACALL _NotifyGameEnd
ACALL _DisplayGameScore
SJMP C51Main ; Loop around to Main Block
END ; End of app.

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