datalogger.c

PIC18F4550 SD CARD USB

/*********************************************************************
 *
 *                Microchip USB C18 Firmware Version 1.0
 *
 *********************************************************************
 * FileName:        Datalogger.c
 * Dependencies:    See INCLUDES section below
 * Processor:       PIC18
 * Compiler:        C18 3.0
 * Company:         Microchip Technology, Inc.
 *
 * Software License Agreement
 *
 * The software supplied herewith by Microchip Technology Incorporated
 * (the 揅ompany? for its PICmicro?Microcontroller is intended and
 * supplied to you, the Company抯 customer, for use solely and
 * exclusively on Microchip PICmicro Microcontroller products. The
 * software is owned by the Company and/or its supplier, and is
 * protected under applicable copyright laws. All rights are reserved.
 * Any use in violation of the foregoing restrictions may subject the
 * user to criminal sanctions under applicable laws, as well as to
 * civil liability for the breach of the terms and conditions of this
 * license.
 *
 * THIS SOFTWARE IS PROVIDED IN AN 揂S IS?CONDITION. NO WARRANTIES,
 * WHETHER EXPRESS, IMPLIED OR STATUTORY, INCLUDING, BUT NOT LIMITED
 * TO, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
 * PARTICULAR PURPOSE APPLY TO THIS SOFTWARE. THE COMPANY SHALL NOT,
 * IN ANY CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL OR
 * CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER.
 *
 * Author               Date        Comment
 *~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 * Gurinder Singh       10/28/05    Original.
 ********************************************************************/

/** I N C L U D E S *************************************************/
#include "system/fat16/fileio.h"
#include "system/sdcard/sdcard.h"
#include "stdlib.h"
#include "string.h"


/** G L O B A L   B U F F E R  &  V A R I A B L E S ******************/

char writeBffr[513];
char ReadBuffer[4][10] ;
char RBuf[8] ;
int index=0;


/** S D  C A R D   D A T A   R E P R E N S T A T I O N **************/

	DISK myDisk;
	
	DISK * diskPtr = &myDisk;
	
	FILE *  myFile;	
	
	CARDSTATUS cs;
	
	char name[] = "DATALOG TXT";    // File names, in 8.3 format
	
	CETYPE error;	                // The error from functions
	
/********************************************************************
 * Function:        void InitFAT(void)
 *
 * PreCondition:    None
 *
 * Input:           None
 *
 * Output:          None
 *
 * Side Effects:    None
 *
 * Overview:        Mounts the Disk and intilize the CARD
 *
 * Note:            None
 ********************************************************************/	

void InitFAT (void)
{
	
		
	SocketInitialize(); //Initializes the socket
	
	                   // Start the card
	
	if ( StartupCard ( diskPtr, &cs) == CE_GOOD )
	{
		;
		
	}//~Card initialized, disk mounted
	else
	{
		// Your card could not be initialized correctly.
		//  Try removing it from the connector and then 
		//reinserting it, then running the code again
		while(1);
	}
}


void	ReadFile(void)
{

		int	Index ;
		int	Loop , ReadLine ;

			if ( ( myFile = fopen (name, diskPtr, READ) ) == NULL )
				{
			
				while(1); //File Could not be created; infinate loop
				}

		for ( Loop = 0 ; Loop < 4 ; Loop++ )
		{
			ReadLine = 1 ;
			Index = 0 ;
			while(ReadLine)
			{
			 	fread (myFile, RBuf, 1) ;
				ReadBuffer[Loop][Index] = RBuf[0] ;
				Index ++ ; 
				if (RBuf[0] == 0x0a)
				ReadLine = 0 ;
			}
		}
		if ( fclose ( myFile ) != CE_GOOD) // closes the file and updates the size
			{
			while(1);
			}	

}
/******************************************************************
 * Function:        void DoADC(void)
 *
 * PreCondition:    None
 *
 * Input:           None
 *
 * Output:          None
 *
 * Side Effects:    None
 *
 * Overview:        Check the Index value if its "zero" create a new file
 *                  DATALOG.TXT and write the A/D results. If the Index is 
 *                  not zero it will open the file in append mode and add 
 *                  append the result into the file.    
 *
 * Note:            None
 *******************************************************************/
void DoADC ()
{
	const char tn[]="\r\n";
	const char ts[]=" ";
	char test[10];
	int result;
	if (index==0) {
		
		// Create a new file: DATALOG.TXT
		if ( ( myFile = fopen (name, diskPtr, WRITE) ) == NULL )
		{
			
			while(1); //File Could not be created; infinate loop
		}
		
		
		
		
		if ( fclose ( myFile ) != CE_GOOD) // closes the file and updates the size
		{
			while(1);
		}	
	}
	if ( ( myFile = fopen (name, diskPtr, APPEND) ) == NULL )
	{
			
			while(1);          //Infinate loop if file not created
	} else {
		index++;
		itoa(index,writeBffr);
		strcat(writeBffr,ts);
		ADCON0bits.GO = 1;          // Start AD conversion
	    while(ADCON0bits.NOT_DONE);     // Wait for conversion
	    result=ADRESH*256+ADRESL;
	    itoa(result,test);
		strcat(writeBffr,test);
		strcat(writeBffr,tn);
  	    if((error = fwrite (myFile, writeBffr, strlen(writeBffr))) != CE_GOOD) {
			while(1);
		  
		}
	
		
				
		if ( fclose ( myFile ) != CE_GOOD)  // closes the file and updates the size
		{
			while(1);
		}
	}
}