LED Service Pseudocode

Function InitLEDService(Priority):

    Set MyPriority to Priority

    Clear the screen

    Set CurrentState to InitLState

    Initialize the DeferralQueue with the required size

    Configure SPI module (SPI_1):

     - Set basic SPI configuration

     - Set leader mode, clock period, transfer width, etc.

     - Enable SPI module

    If SPI configuration succeeds:

        Print "PIC 32 Initialized"

        Initialize the display

        Transition CurrentState to WAITING

        Print "Display Initialized"

    Else:

        Print "Failed to initialize"

    Post an ES_INIT event to the service queue

    If the event posting succeeds:

        Return true

    Else:

        Return false

Function PostLEDService(Event):

    Post Event to the queue with MyPriority

    Return success or failure

Function RunLEDService(Event):

    Initialize ReturnEvent as ES_NO_EVENT (default: no errors)

Switch(CurrentState):

        Case InitLState:

            If Event.Type is ES_INIT:

             Print "ES_INIT received in LED Service"

        Case WAITING:

            If Event.Type is ES_MESSAGE:

             Switch(Event.Parameter):

                 Case ES_DISPLAY_SCORE:

                     Clear the display buffer

                     Add "Score: 00" to the display buffer

                     Post an ES_UPDATING event

                     Transition to UPDATING

                 Case ES_UPDATING_SCORE:

                     Increment score

                     Clear the display buffer

                     Add "Score:" followed by updated score to the display buffer

                     Post an ES_UPDATING event

                     Transition to UPDATING

                 Case ES_MESSAGE:

                     Print "Game Timed Out"

                     Post an ES_PRINT event with "Game Timed Out"

                 Case ES_INSERT2:

                     Print "Insert 2 Coins..."

                     Post an ES_PRINT event with "Insert 2 Coins..."

                 Case ES_INSERT1:

                     Print "Insert 1 Coin..."

                     Post an ES_PRINT event with "Insert 1 Coin..."

                 Case ES_CONGRATS:

                     Clear the display buffer

                     Print "Great job!!!"

                     Post an ES_PRINT event with "Great job!!!"

                 Case ES_DEFEAT:

                     Clear the display buffer

                     Print "I've seen better..."

                     Post an ES_PRINT event with "I've seen better..."

                 Default:

                     Scroll the display buffer by 4 columns

                     Add the Event.Parameter to the display buffer

                     Post an ES_UPDATING event

                     Transition to UPDATING

        Case UPDATING:

            If Event.Type is ES_UPDATING:

             If the display update step is incomplete:

                 Post another ES_UPDATING event

             Else:

                 Transition to WAITING

        Default:

            Do nothing (no action for undefined states)

    Return ReturnEvent

Function QueryLEDService():

    Return CurrentState