PipeSegment.pseudo

Pseudo-code for the PipeSegment module (a service that implements a state machine to control the movement of the two pipe segments)
Data private to the module: MyPriority, CurrentState

InitPipeSegment
Takes a priority number, returns True

Initialize the MyPriority variable with the passed in parameter
Initialize the port lines to write to PipeServo1 and PipeServo2
Initialize the port lines to write to PipeLED1 and PipeLED2
Start both pipes in the “pipes in” position
Set CurrentState to BothPipesIn
End of InitializePipeSegment (return True)

PostPipeSegment
Takes an event to post, returns True if event was posted
End of PostPipeSegment

RunPipeSegment (implements a 3-state state machine for the pipe segments)
The EventType field of ThisEvent will be one of: ES_PIPE1_BUTTON_DBDOWN, ES_PIPE2_BUTTON_DBDOWN, ES_TIMEOUT, ES_GAMEOVER, ES_PIPE_DOWN_LOST

Local Variables: NextState

Set NextState to CurrentState
Based on the state of the CurrentState variable, choose one of the following blocks of code:
		
CurrentState is BothPipesIn
If EventType is ES_TIMEOUT and parameter is pipe 
timer number
	Post event ES_PLAY_TUNE to Audio1 and Audio2 
with event parameter PipeOut
Calculate a random integer: either 0 or 1
	If random integer is 0:
		Move pipe 1 to the out position
Set NextState to Pipe1Out
Turn on pipe 1 button LED
	EndIf
	If random integer is 1:
		Move pipe 2 to the out position
Set NextState to Pipe2Out
Turn on pipe 2 button LED
	EndIf
EndIf
If EventType is ES_GAMEOVER
	Set NextState to InCelebration
EndIf
		End BothPipesIn block
		
		CurrentState is Pipe1Out
			If (EventType is ES_PIPE_DOWN_LOST) or (EventType is 
ES_PIPE1_BUTTON_DBDOWN)
	Turn off Pipe button LEDs
Post Event ES_PLAY_TUNE to Audio1 and Audio2 
with event parameter PipeIn
Post Event ES_PIPE_RECOVERED to Bucket Service,
Wrench Service, Audio1, and Audio2
Move Pipe1 to the in position
	Set NextState to BothPipesIn
	Start pipe timer for 16 seconds
EndIf
If EventType is ES_GAMEOVER
	Turn off pipe button LEDs
	Move pipe 1 back to the in position
	Set NextState to InCelebration
EndIf
		End Pipe1Out Block

		CurrentState is Pipe2Out
			If (EventType is ES_PIPE_DOWN_LOST) or (EventType is 
ES_PIPE2_BUTTON_DBDOWN)
	Turn off Pipe button LEDs
Post Event ES_PLAY_TUNE to Audio1 and Audio2 
with event parameter PipeIn
Post Event ES_PIPE_RECOVERED to Bucket Service,
	Wrench Service, Audio1, and Audio2
Move Pipe2 to the in position
	Set NextState to BothPipesIn
	Start pipe timer for 16 seconds
EndIf
If EventType is ES_GAMEOVER
	Turn off pipe button LEDs
	Move pipe 2 back to the in position
	Set NextState to InCelebration
EndIf
		End Pipe2Out Block
		
		CurrentState is InCelebration
			If EventType is ES_START_BUTTON_DBDOWN
				Set NextState to BothPipesIn
			EndIf
		End InCelebration Block

Set CurrentState to NextState

Return ES_NO_EVENT
End of RunPipeSegment