uimgr.c

mg128＋Ov7620实现图象采集

/***********************************************************
	Module Name: UIMgr.c
	Module Date: 04/10/2004
	Module Auth: John Orlando
	
	Description: This module is responsible for providing
	the processing to manage the user interface of the
	system.  This user interface is provided via the UART.
	This module handles the incoming serial commands, and
	performs the needed functionality.  It is then
	responsible for generating any needed response to
	the external entity.
    

***********************************************************/

/*	Includes */
#include <avr/io.h>
#include <stdlib.h>
#include <string.h>
#include <avr/eeprom.h>
#include "CommonDefs.h"
#include "UIMgr.h"
#include "UartInterface.h"
#include "CamConfig.h"
#include "Utility.h"
#include "Executive.h"
#include "CamInterface.h"

/* 	Local Structures and Typedefs */

typedef enum
{
	getVersionCmd,
	pingCmd,
	setCameraRegsCmd,
	dumpFrameCmd,
	resetCameraCmd,
	noCmd,
	invalidCmd
} UIMgr_Cmd_t;



/*  Local Variables */
static unsigned char charCount = 0; 
static unsigned char charIndex = 0;
static unsigned char asciiTokenBuffer[MAX_TOKEN_LENGTH+1]; /* +1 to ensure NULL at end =3*/
static unsigned char tokenCount = 0;
static unsigned char tokenBuffer[MAX_TOKEN_COUNT];
static UIMgr_Cmd_t receivedCmd = noCmd;
static unsigned char AVRcamVersion[] = "AVRcam v1.4\r";

/*  Local Function Declaration */
static unsigned char UIMgr_readRxFifo(void);
static unsigned char UIMgr_readTxFifo(void);
static unsigned char UIMgr_readRxFifo(void);
static void UIMgr_sendNck(void);
static void UIMgr_sendAck(void);
static void UIMgr_convertTokenToCmd(void);
static void UIMgr_convertTokenToValue(void);
static void UIMgr_executeCmd(void);

/*  Extern Variables */
unsigned char UIMgr_rxFifo[UI_MGR_RX_FIFO_SIZE];
unsigned char UIMgr_rxFifoHead=0;
unsigned char UIMgr_rxFifoTail=0;

unsigned char UIMgr_txFifo[UI_MGR_TX_FIFO_SIZE];
unsigned char UIMgr_txFifoHead=0;
unsigned char UIMgr_txFifoTail=0;

/*  Definitions */
#define IS_DATA_IN_TX_FIFO() (!(UIMgr_txFifoHead == UIMgr_txFifoTail))
#define IS_DATA_IN_RX_FIFO() (!(UIMgr_rxFifoHead == UIMgr_rxFifoTail))

/* MAX_EEPROM_WRITE_ATTEMPTS limits the number of writes that can be
done to a particular EEPROM cell, so that it can't possible just 
write to the same cell over and over */
#define MAX_EEPROM_WRITE_ATTEMPTS 3

/***********************************************************
	Function Name: UIMgr_init
	Function Description: This function is responsible for
	initializing the UIMgr module.  It sets up the fifo
	used to hold incoming data, etc.
	Inputs:  none 
	Outputs: none
***********************************************************/	
void UIMgr_init(void)
{
	memset(asciiTokenBuffer,0x00,MAX_TOKEN_LENGTH+1);
	memset(tokenBuffer,0x00,MAX_TOKEN_COUNT);
	memset(UIMgr_txFifo,0x00,UI_MGR_TX_FIFO_SIZE);
	memset(UIMgr_rxFifo,0x00,UI_MGR_RX_FIFO_SIZE);
}

/***********************************************************
	Function Name: UIMgr_dispatchEvent
	Function Description: This function is responsible for
	processing events that pertain to the UIMgr.
	Inputs:  event - the generated event
	Outputs: none
***********************************************************/	
void UIMgr_dispatchEvent(unsigned char event)
{
	switch(event)
	{

		case EV_SERIAL_DATA_RECEIVED:	//first reach here	
	
			UIMgr_processReceivedData();
			break;
			
		case EV_SERIAL_DATA_PENDING_TX:
			UIMgr_flushTxBuffer();
			break;
	}
}
/***********************************************************
	Function Name: UIMgr_transmitPendingData
	Function Description: This function is responsible for
	transmitting a single byte of data if data is waiting
	to be sent.  Otherwise, if nothing is waiting, the
	function just returns.
	Inputs:  none 
	Outputs: none
***********************************************************/
void UIMgr_transmitPendingData(void)
{
	if (IS_DATA_IN_TX_FIFO() == TRUE)
	{
		/* data is waiting...send a single byte */
		UartInt_txByte( UIMgr_readTxFifo() );
	}
}
/***********************************************************
	Function Name: UIMgr_processReceivedData
	Function Description: This function is responsible for
	parsing any serial data waiting in the rx fifo
	Inputs:  none 
	Outputs: none
***********************************************************/
void UIMgr_processReceivedData(void)
{
	unsigned char tmpData = 0;

	/* still need to add a mechanism to handle token counts 
	that are excessive!!! FIX ME!!! */
    
	while(IS_DATA_IN_RX_FIFO() == TRUE)
	{
		tmpData = UIMgr_readRxFifo();
		if (tmpData == '\r') 
		{
			/* we have reached a token separator */
			if (tokenCount == 0)
			{
				/* convert the command */
				UIMgr_convertTokenToCmd();				
			}
			else
			{
				/* convert a value */
				UIMgr_convertTokenToValue();
				tokenCount++;
			}
			/* either way, it is time to try to process the received
			token list since we have reached the end of the cmd. */
			Utility_delay(100);
			if (receivedCmd == invalidCmd ||
			     receivedCmd == noCmd )
			{
				UIMgr_sendNck();
				PUBLISH_EVENT(EV_SERIAL_DATA_PENDING_TX);//Exec_writeEventFifo(event)
			}
			else
			{
				UIMgr_sendAck();
				/* publish the serial data pending event, so it
				will push the ACK out before we execute the cmd */
				PUBLISH_EVENT(EV_SERIAL_DATA_PENDING_TX);
				UIMgr_executeCmd();
			}
			
			/* reset any necessary data */
			tokenCount = 0;
			memset(tokenBuffer,0x00,MAX_TOKEN_COUNT);
		}
		else if (tmpData == ' ')  /* space char */
		{
			/* the end of a token has been reached */
			if (tokenCount == 0)
			{
				UIMgr_convertTokenToCmd();
				tokenCount++;   /* check this...why is this being incremented here??? This
                means we have received a token, with tokenCount == 0, which means it is a
                command...why is this contributing to tokenCount?
                This might cause the set color map command to include too much data, since
                it sets the color map based on tokenCount...CHECK*/
			}
			else
			{
				/* check to see if this token is going to push
				us over the limit...if so, abort the transaction */
				if (tokenCount+1 >= MAX_TOKEN_COUNT)//=64
				{
					/* we received too many tokens, and 
					need to NCK this request, since its too
					large...reset everything...*/
					charCount=0;
					charIndex=0;
					tokenCount=0;
					receivedCmd = invalidCmd;
				}
				else
				{
					/* tokenCount is still in range...*/
					UIMgr_convertTokenToValue();
					tokenCount++;
				}
			}
		}
		else if ( (tmpData >= 'A' && tmpData <= 'Z') ||
				   (tmpData >= '0' && tmpData <= '9') )
		{
			/* a valid range of token was received */
			asciiTokenBuffer[charIndex] = tmpData;
			charCount++;
			charIndex++;
			if (charCount > MAX_TOKEN_LENGTH)//=3
			{
				/* we have received a token that cannot be handled...
				set the received cmd to an invalid cmd, and wait
				for the \r to process it */
				receivedCmd = invalidCmd;
				charIndex = 0;  /* ...so we won't overwrite memory */
			}
		}
		else
		{
			/* an invalid character was received */
			receivedCmd = invalidCmd;
		}
	}  /* end while */
	
	asm volatile("clt"::);  /* clear out the T flag in case it wasn't
								 cleared already */
}						

/***********************************************************
	Function Name: UIMgr_executeCmd
	Function Description: This function is responsible for
	executing whatever cmd is stored in the receivedCmd
	object.
	Inputs:  none 
	Outputs: none
***********************************************************/
static void UIMgr_executeCmd(void)
{
	unsigned char i;//,eepromData, num_writes=0;
	unsigned char *pData;
#if	DEBUG_COLOR_MAP	
	unsigned char asciiBuffer[5];
#endif

	if (receivedCmd == pingCmd) 
	{
	}
	else if (receivedCmd == getVersionCmd)
	{
		pData = AVRcamVersion;
		while(*pData != 0)
		{