Code for C32 Microprocessor

Pseudocode

SmokeNMirrors_Main Module

Main
Call Function InitializePortM
Call Function InitializePortAD
Call Function InitializePWM
Call Function InitializePortT
Call Function InitializeTimer

Forever
Begin
	Set eventcode to value returned by CheckGameEvents
	Call Function HandleGameEvents and pass eventcode as parameter
(Both CheckGameEvents and HandleGameEvents are part of GameControl Module)
End

InitializePortM
	Set Bit M0 to input from Coin Sensor
	Set Bit M1 to input from Laser Break circuit
Set Bit M2 to input from Target
	Set Bit M3 to input from Difficulty switch

	Set Bit M4 to output to the Laser Fire
	Set Bit M4 to low to begin with
	Set Bit M5 to output to the Vibrating Motor
	Set Bit M5 to low to begin with

InitializePortAD
Initialize the A/D converter and port AD with bits 3 to 7 as outputs and bits 0-2 as analog inputs
If the initialization is unsuccessful, print an error message

InitializePWM
	Initialize the PWM subsystem using PWM12_Init
	Set Channels 0,1 and 2 to output a duty cycle with a predefined period

InitializePortT
	Set Bit T3 to output to Solenoid 1
	Set Bit T4 to output to Solenoid 2
	Set Bit T5 to output to Clock Countdown
	Set Bit T6 to output to Clock Reset
	Set Bit T7 to output

	Set Bits T3 to T7 as low to begin with

InitializeTimer
	Initialize the S12Timer module with a 1ms rate
 

GameControl Module

CheckGameEvents
Determines which event has taken place during game play.  Takes no parameters 
and returns a character value to indicate the corresponding event.

	Set Event is NO_EVENT

If Solenoid 1 timer has expired
	Event is SOLENOID_1_CLOCK_EXPIRE_EVENT
If Solenoid 2 timer has expired
	Event is SOLENOID_2_CLOCK_EXPIRE_EVENT
If the timer in between the two solenoids has expired
	Event is BETWEEN_SOLENOIDS_CLOCK_EXPIRE_EVENT
If the clock pulse timer has expired
	Event is COUNTDOWN_CLOCK_PULSE_EXPIRE_EVENT
If the reset pulse timer has expired
	Event is COUNTDOWN_RESET_PULSE_EXPIRE_EVENT

If the GameState is GAME_OVER
	If coin is inserted
		Event is COIN_INSERT_EVENT
	If Servo Ground timer has expired
		Event is SERVO_GND_TIMER_EXPIRE_EVENT
Endif

If the GameState is GAME_ON
	If the Laser Fire timer has expired
		Event is LASER_CLOCK_EXPIRE_EVENT
If the Clock countdown value is greater than zero and the countdown clock number has expired
	Event is COUNTDOWN_CLOCK_EXPIRE_EVENT
If the difficulty level has been changed
	Event is DIFFICULTY_CHANGE_EVENT
If the target has been hit
	Event is TARGET_HIT_EVENT
If the Laser (non-contact sensor) has been broken
	Event is LASER_BREAK_EVENT
If the game clock expires
	Event is CLOCK_VALUE_TO_ZERO_EVENT
If the potentiometer has been changed
	Event is POT_CHANGE_EVENT
	Endif
	Return Event

HandleGameEvents
Handles the services required for every event parameter returned by the CheckGameEvents function.
	If Event is LASER_BREAK_EVENT
		If Laser is not firing
			FireLaser
		Endif
	Endif
	If Event is DIFFICULTY_CHANGE_EVENT
		SwitchDifficulty
	Endif
	If Event is TARGET_HIT_EVENT
		Stop the Laser time and Clock Countdown timer
		Call SetSolenoid1 to release lower Solenoid to dispense prize 
		Call StartSolenoidTimer to start timer and hold solenoid 1 open
		Set Bit M5 to high to hit victory buzzer
		Set GameState to GAME_OVER
		Call StartServoTimer to start timer and ground the servos
	Endif
	If Event is LASER_CLOCK_EXPIRE_EVENT
		Clear the expired timer
		StopFiringLaser
	Endif
	If Event is POT_CHANGE_EVENT
		UpdateServos
	Endif
	If Event is SERVO_GND_TIMER_EXPIRE_EVENT
		Clear the expired timer
		Ground the servos
	Endif
	If Event is COIN_INSERT_EVENT
		StartGame
	Endif
	If Event is SOLENOID_1_CLOCK_EXPIRE_EVENT
		Clear expired timer
		Hold Solenoid 1
		Start timer between the two solenoids
	Endif
	If Event is BETWEEN_SOLENOIDS_CLOCK_EXPIRE_EVENT
		Clear expired timer
		Release Solenoid 2
		Start timer to keep Solenoid 2 in released state
	Endif
	If Event is SOLENOID_2_CLOCK_EXPIRE_EVENT
		Clear expired timer
		Hold Solenoid 2
		StopFiringLaser
	Endif
	If Event is COUNTDOWN_RESET_PULSE_EXPIRE_EVENT
		Clear expired timer
		Set the Clock Reset line to low
	Endif
	If Event is COUNTDOWN_CLOCK_PULSE_EXPIRE_EVENT
		Clear expired line
		Set the Clock Countdown line to low
	Endif
	If Event is COUNTDOWN_CLOCK_EXPIRE_EVENT
		Clear expired timer
		Decrement the display on the Clock by 5 secs 
	Endif
	If Event is CLOCK_VALUE_TO_ZERO_EVENT
		Stop Clock Countdown and Laser timers
		StopFiringLaser
		Start Servo Grounding timers
		Set GameState = GAME_OVER
	Endif

CheckPots
	CheckPots check to see if any of the three potentiometers have changed beyond the pot change thresholds.
	It takes no parameters and returns the state of the pots as POT_CHANGED or POT_UNCHANGED.

Set static variable lastPot1State = -1
    	Set static variable lastPot2State = -1
Set static variable lastPot3State = -1

Set static variable currentPot1State to read the analog value from Pin1 of Port AD
Set static variable currentPot2State to read the analog value from Pin2 of Port AD
Set static variable currentPot3State to read the analog value from Pin3 of Port AD

If ((currentPot1State - lastPot1State > POT_CHANGE_THRESHOLD) 
                or (lastPot1State - currentPot1State > POT_CHANGE_THRESHOLD))
lastPot1State = currentPot1State
return POT_CHANGED
Endif
If ((currentPot2State – lastPot2State > POT_CHANGE_THRESHOLD) 
               or (lastPot2State – currentPot2State > POT_CHANGE_THRESHOLD))
lastPot2State = currentPot2State
return POT_CHANGED
Endif
If ((currentPot3State – lastPot3State > POT_CHANGE_THRESHOLD) 
               or (lastPot3State – currentPot3State > POT_CHANGE_THRESHOLD))
lastPot3State = currentPot3State
return POT_CHANGED
Endif
Return POT_UNCHANGED



UpdateServos
	UpdateServos sets the duty cycle for each servo to match the potentiometer value.

Set static variable currentPot1State to read the analog value from Pin1 of Port AD
Set static variable currentPot2State to read the analog value from Pin2 of Port AD
Set static variable currentPot3State to read the analog value from Pin3 of Port AD

	If (currentPot1State >= 0)
Servo1DutyCycle = (unsigned char)((unsigned int) DUTY_CYCLE_RATIO * currentPot1State/512)
        		If (Servo1DutyCycle > MAX_DUTY_CYCLE) 
Servo1DutyCycle = MAX_DUTY_CYCLE
Endif
If (Servo1DutyCycle < MIN_DUTY_CYCLE) 
Servo1DutyCycle = MIN_DUTY_CYCLE
Endif
Set duty cycle on Channel 0 to Servo1DutyCycle
	Endif
If (currentPot2State >= 0)
Servo2DutyCycle = (unsigned char)((unsigned int) DUTY_CYCLE_RATIO * currentPot2State/512)
        		If (Servo2DutyCycle > MAX_DUTY_CYCLE) 
Servo2DutyCycle = MAX_DUTY_CYCLE
Endif
If (Servo2DutyCycle < MIN_DUTY_CYCLE) 
Servo2DutyCycle = MIN_DUTY_CYCLE
Endif
Set duty cycle on Channel 1 to Servo2DutyCycle
	Endif
If (currentPot3State >= 0)
Servo3DutyCycle = (unsigned char)((unsigned int) DUTY_CYCLE_RATIO * currentPot3State/512)
        		If (Servo3DutyCycle > MAX_DUTY_CYCLE) 
Servo3DutyCycle = MAX_DUTY_CYCLE
Endif
If (Servo3DutyCycle < MIN_DUTY_CYCLE) 
Servo3DutyCycle = MIN_DUTY_CYCLE
Endif
Set duty cycle on Channel 2 to Servo3DutyCycle
	Endif

StartLaserTimer
	Starts the timer for firing the Laser.  Inputs no parameters and returns no value.

	Initialize Laser timer for duration depending on current difficulty level

CheckCoin
	Checks coin sensor. Inputs no parameters and returns COIN_INSERTED, COIN_NOT_INSERTED, or NO_EVENT

	Set Coin_status = COIN_NOT_INSERTED

	If (Coin_status = COIN_NOT_INSERTED) and (presence of coin is detected)
		Coin_status = COIN_INSERTED
		Return Coin_status
	Elseif (Coin_status = COIN_INSERTED) and (absence of coin is detected)
		Coin_status = COIN_NOT_INSERTED
		Return Coin_status
	Endif
	Return NO_EVENT

CheckLaserBreak
	Checks non-contact laser sensor. Inputs no parameters and returns LASER_BROKEN, LASER_NOT_BROKEN, or NO_EVENT

	Set laserBreak = LASER_NOT_BROKEN

	If (laserBreak = LASER_NOT_BROKEN) and (laser is broken)
		laserBreak = LASER_BROKEN
		Return laserBreak
	Elseif (laserBreak = LASER_BROKEN) and (laser is not broken)
		laserBreak = LAER_NOT_BROKEN
		Return laserBreak
	Endif
	Return NO_EVENT

CheckDifficultySwitch	
Checks if difficulty has been changed.  Inputs no parameters and returns DIFFICULTY_CHANGE or DIFFICULTY_NO_CHANGE

	If (DifficultyLevel = EASY) and (difficulty is changed)
		Return DIFFICULTY_CHANGE
	Elseif (DifficultyLevel = HARD) and (difficulty is changed)
		Return DIFFICULTY_CHANGE
	Endif
	Return DIFFICULTY_NO_CHANGE

CheckTarget
	Checks if the target has been hit.  Inputs no parameters and returns TARGET_HIT, TARGET_NOT_HIT or NO_EVENT

Set lastTarget1 = TARGET_NOT_HIT;

If  (lastTarget1 = TARGET_NOT_HIT) and (target is hit)
lastTarget1 = TARGET_HIT
return TARGET_HIT
Elseif (lastTarget1 = TARGET_HIT) and (target is not hit)
lastTarget1 = TARGET_NOT_HIT
return TARGET_NOT_HIT
Endif
Return NO_EVENT
StartGame
	Sets up the game to start playing.  Inputs no parameters and returns no value.

	Set GameState = GAME_ON
	Turn off vibrating motor by setting Bit M5 to low
	Reset the game clock to 25 secs
	Start the Countdown Reset timer

FireLaser
Fires the Laser and starts timers for Laser firing and Clock Countdown.

Fire Laser by setting Bit M4 to high
Set LaserState = LASER_FIRING
If (DifficultyLevel = HARD)
	Fire Laser for shorter duration
Else
	Fire Laser for 5 secs
Endif

Start the Laser timer
Start the Clock Countdown timer

StopFiringLaser
	Stops firing the Laser.  Inputs no parameters and returns no value.

	Set Bit M4 to low
	Set LaserState = LASER_NOT_FIRING

SetSolenoid
	Sets the state of a solenoid to be either released or held.  Inputs solenoid number and state.  Returns no value.

	If (solenoid_state = SOLENOID_RELEASE)
		Release Solenoid
	Endif
	If (solenoid_state = SOLENOID_HOLD)
		Hold Solenoid
	Endif

StartSolenoidTimer
	Starts timer for either lower, upper solenoid or the airlock.  Inputs solenoid number and returns no value.

	If (solenoid_number = SOLENOID_1)
		Start timer for Solenoid 1 for 1 sec
Endif
If (solenoid_number = SOLENOID_2)
		Start timer for Solenoid 2 for 1 sec
Endif
If (solenoid_number = BETWEEN_SOLENOIDS)
		Start timer for airlock for 3 secs
Endif

SwitchDifficulty
	Switch the game difficulty.  Inputs no parameters and returns no value.

	If (DifficultyLevel = EASY)
		DifficultyLevel = HARD
	Endif
	If (DifficultyLevel = HARD)
		DifficultyLevel = EASY
	Endif

SetCountdownReset
	Sets the value of the reset line to high or low.  Inputs reset value and returns no value.

	If (reset_value = RESET_LINE_HI)
		Set Bit T6 to high
	Endif
	If (reset_value = RESET_LINE_LO)
		Set Bit T6 to low
	Endif

SetCountdownClock
	Sets the clock value of the Countdown clock to high or low.  Inputs the clock value and returns no value.
	
	If (clock_value = CLOCK_LINE_HI)
		Set Bit T5 to high
	Endif
	If (clock_value = CLOCK_LINE_LO)
		Set Bit T5 to low
	Endif

StartCountdownResetTimer
	Starts the Countdown reset pulse timer.  Inputs no parameters and returns no value.

	Start the Countdown reset timer to count to 10ms

StartCountdownTimer
	Starts the Countdown timer.  Inputs no parameters and returns no value.

Start the Countdown clock timer to count to 1 sec or 500ms depending on difficulty being EASY or HARD respectively

StartCountdownClockPulseTimer
	Starts the timer for the clock pulse.  Inputs no parameters and returns no value.

	Start the clock pulse timer to count to 100ms

GroundServos
Grounds the three servos by setting the PWM duty cycles to zero.  Inputs no parameters and returns no value.

Set duty cycle of channels 0, 1 and 2 to zero.

StartServoTimer
	Starts timer for grounding the servos.  Inputs no parameters and returns no value.

	Start the servo ground timer to count to 2 secs

StopTimers
	Stop timers for laser fire and countdown clock to prevent these events from continuing after game is over. 
	Inputs no parameters and returns no value.

	Stop timer for the laser
	Stop timer for the Countdown clock