StartButton.pseudo

/***Service Module to debounce start button***/

define All_BITS offset variable

initialize module level variables

/**************************************************************
Function: InitStartButtonDB
Takes: 8 bit integer (priority number)
Returns: true or false
Purpose: Passes in priority number, initializes Tiva pins, and moves into state machine.
/*************************************************************/
InitStartButtonDB
	Store priority value as static variable
	Initialize port A
	Initialize bit 2
	Sample the button port pin
	Set CurrentState to be Debouncing
	Start debounce timer
	return true
end

/**************************************************************
Function: PostStartButtonDB
Takes: ES_Event
Returns: true or false
Purpose: Posts events to this service's queue.
/*************************************************************/
PostStartButton
	call ES_PostToService with the priority number of this service
end

/**************************************************************
Function: CheckStartButtonEvents
Takes: nothing
Returns: true or false
Purpose: Checks the state of the start button and reports it to this service.
/*************************************************************/
CheckStartButtonEvents
	Sample port pin, store value to CurrentButtonState
	if CurrentButtonState is not LastButtonState
		if CurrentButtonState is high
			Tell this service the start button is down
		else
			Tell this service the start button is up
		endif
	endif
	Update LastButtonState to CurrentButtonState
	return true
endif

/**************************************************************
Function: RunStartButtonDB
Takes: ES_Event
Returns: ES_Event (ES_NO_EVENT)
Purpose: Runs the start button debounce state machine.
/*************************************************************/
RunStartButtonDB
	if CurrentState is Debouncing
		if event is a debounce timer timeout
			Move into Ready2Sample state
		endif
	else if CurrentState is Ready2Sample
		if event is start button up
			Start debounce timer
			Move into debouncing state
		}
		else if event is start button down
			Start debounce timer
			Move into debouncing state
			Post DBButtonDown to main state machine
		endif
	endif
	Return ES_NO_EVENT
}