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/*
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    Copyright (C) 2004    John Orlando
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   AVRcam: a small real-time image processing engine.
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    This program is free software; you can redistribute it and/or
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    modify it under the terms of the GNU General Public
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    License as published by the Free Software Foundation; either
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    version 2 of the License, or (at your option) any later version.
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    This program is distributed in the hope that it will be useful,
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    but WITHOUT ANY WARRANTY; without even the implied warranty of
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    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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    General Public License for more details.
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    You should have received a copy of the GNU General Public
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    License along with this program; if not, write to the Free Software
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    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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   For more information on the AVRcam, please contact:
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   john@jrobot.net
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   or go to www.jrobot.net for more details regarding the system.
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*/
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/***********************************************************
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	Module Name: Executive.c
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	Module Date: 04/12/2004
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	Module Auth: John Orlando
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	Description: This file is responsible for implementing a
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	minimalist event dispatcher.  It keeps track of an event
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	fifo that waits for new events to come in, and dispatches
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	them to any entities that care about them.
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    Revision History:
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    Date        Rel Ver.    Notes
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    4/10/2004      0.1     Module created
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    6/30/2004      1.0     Initial release for Circuit Cellar
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                           contest.
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    1/16/2005      1.4     Fixed issue where the interrupts weren't
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                           being turned off when the fastEventBitmask
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                           was being accessed.  Also removed redundant
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                           interrupt masking when accessing the
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                           main event fifo.  Also fixed issue where
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                           the main event fifo wasn't being checked
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                           for events if an event was pending in
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                           the fast event fifo.
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***********************************************************/
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/*	Includes */
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#include <stdlib.h>
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#include "CommonDefs.h"
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#include "Executive.h"
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#include "FrameMgr.h"
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#include "CamInterface.h"
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#include "UIMgr.h"
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#include "UartInterface.h"
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#include "CamConfig.h"
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#include "Utility.h"
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/*  Local Variables */
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unsigned char Exec_eventFifo[EXEC_EVENT_FIFO_SIZE];
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unsigned char Exec_eventFifoHead=0;
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unsigned char Exec_eventFifoTail=0;
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/*  Local Function Definitions */
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static unsigned char Exec_readEventFifo(void);
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/* 	Local Structures and Typedefs */
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/*  Extern Variables */
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/* This bitmask holds events that need to be processed as fast as possible */
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unsigned char fastEventBitmask = 0x00;
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/*  Definitions */
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#define IS_DATA_IN_EVENT_FIFO() (!(Exec_eventFifoHead == Exec_eventFifoTail))
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/***********************************************************
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	Function Name: Exec_run
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	Function Description: This function is responsible for
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	running the main control loop.  The control loop is 
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	based on checking both the fast-event bitmask (for high
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    priority events) and the event FIFO to determine if an
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    event needs to be handled.  The event is then dispatched
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    to the appropriate handler.
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	Inputs:  none
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	Outputs: none
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***********************************************************/	
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void Exec_run(void)
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{
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	unsigned char eventGenerated;
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	while(1)
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	{
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		if (fastEventBitmask)
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		{
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			/* an event needing fast processing has been received */
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			/* a received line needs to be processed...this
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			needs to be processed as quickly as possible */
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			if (fastEventBitmask & FEV_ACQUIRE_LINE_COMPLETE)
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			{
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                DISABLE_INTS();
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				fastEventBitmask &= ~FEV_ACQUIRE_LINE_COMPLETE;	
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                ENABLE_INTS();
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				FrameMgr_processLine();				
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				/* also check if serial data needs to be sent
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				out through UIMgr */
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				UIMgr_transmitPendingData();	
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				/* we can't just call acquire line again here,
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				since we don't know if we need to acquire another
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				line or not (it depends on the FrameMgr to figure
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				this out) */
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			}
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			if (fastEventBitmask & FEV_PROCESS_LINE_COMPLETE)
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			{
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                DISABLE_INTS();
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				fastEventBitmask &= ~FEV_PROCESS_LINE_COMPLETE;
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                ENABLE_INTS();
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				FrameMgr_acquireLine();
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			}
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		}		
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        if (IS_DATA_IN_EVENT_FIFO() == TRUE)		
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		{			
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            eventGenerated = Exec_readEventFifo();
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			switch(eventGenerated)
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			{
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				case (EV_DUMP_FRAME):
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					FrameMgr_dispatchEvent(eventGenerated);
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					break;
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				case (EV_ENABLE_TRACKING):
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					FrameMgr_dispatchEvent(eventGenerated);
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					break;
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				case (EV_DISABLE_TRACKING):
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					FrameMgr_dispatchEvent(eventGenerated);
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					break;
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				case (EV_ACQUIRE_LINE_COMPLETE):
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					FrameMgr_dispatchEvent(eventGenerated);
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					UIMgr_dispatchEvent(eventGenerated);
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					break;
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				case (EV_ACQUIRE_FRAME_COMPLETE):				
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					FrameMgr_dispatchEvent(eventGenerated);
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					break;
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				case (EV_PROCESS_LINE_COMPLETE):
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					FrameMgr_dispatchEvent(eventGenerated);
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					break;
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				case (EV_PROCESS_FRAME_COMPLETE):
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					FrameMgr_dispatchEvent(eventGenerated);
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					break;
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				case (EV_SERIAL_DATA_RECEIVED):
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					UIMgr_dispatchEvent(eventGenerated);
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					FrameMgr_dispatchEvent(eventGenerated);
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					break;																
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				case (EV_SERIAL_DATA_PENDING_TX):
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					UIMgr_dispatchEvent(eventGenerated);
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					break;
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				default:		
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					break;
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			}			
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		}
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        /* toggle the debug line */
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	}
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}
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/***********************************************************
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	Function Name: Exec_readEventFifo
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	Function Description: This function is responsible for
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	reading a single event out of the event fifo.
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	Inputs:  none 
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	Outputs: unsigned char-the data read
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***********************************************************/	
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static unsigned char Exec_readEventFifo(void)
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{
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	unsigned char dataByte, tmpTail;
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	DISABLE_INTS();
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	/* just return the current tail from the tx fifo */
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	dataByte = Exec_eventFifo[Exec_eventFifoTail];	
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	tmpTail = (Exec_eventFifoTail+1) & (EXEC_EVENT_FIFO_MASK);
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	Exec_eventFifoTail = tmpTail;
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	ENABLE_INTS();
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	return(dataByte);
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}
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/***********************************************************
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	Function Name: Exec_writeEventFifo
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	Function Description: This function is responsible for
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	writing a single event to the event fifo and
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	updating the appropriate pointers.
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	Inputs:  data - the byte to write to the Fifo 
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	Outputs: none
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***********************************************************/	
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void Exec_writeEventFifo(unsigned char event)
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{
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	unsigned char tmpHead;
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	DISABLE_INTS();
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	Exec_eventFifo[Exec_eventFifoHead] = event;
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    /* now move the head up */
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    tmpHead = (Exec_eventFifoHead + 1) & (EXEC_EVENT_FIFO_MASK);
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    Exec_eventFifoHead = tmpHead;
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	ENABLE_INTS();
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}
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