/*
*****************************************************************************
* uFlash876 sample code
* A filing system for the uFlash876/876B i2c EEPROM
*
* Compile using CCS PIC C
*
*****************************************************************************
*/
#include <uF876.h>
#include <uconn.h>

#define EEPROM	0x50				// I2C eeprom address

WORD fptr=0;					// eeprom file pointer
typedef union {float f;BYTE b[4];}fval;		// union allows floats to be
						// accessed as a float or bytes


void file_seek(WORD x);			// set the current file loc
void file_writeb(BYTE x);		// write a byte to the current file loc
void file_writew(WORD x);		// write a word to the current file loc
void file_writef(float val);		// write a float to the currnt file loc
BYTE file_readb(void);			// read a byte from the current file loc
WORD file_readw(void);			// read a word from the current file loc
float file_readf(void);			// read a float from the current file loc

/*
**************************** main *******************************************
*/
BYTE buf[20];

void main(void) 			// place your code here
	{
	}



/*
**************************** EEPROM file module ******************************
*/

void file_seek(WORD x)			// set the current file loc
	{
	fptr=x;
	}

void file_writeb(BYTE x)		// write a byte to the current file loc
	{
	uc_wstart(EEPROM);		// address the external EEPROM
	uc_write((BYTE)(fptr>>8));	// set the EEPROM write address
	uc_write((BYTE)fptr);
	uc_write(x);			// write byte of data
	uc_stop();			// done

	fptr++;				// advance the file pointer
	delay_ms(10);			// allow time to write eeprom
	}

void file_writew(WORD x)		// write a word to the current file loc
	{
	uc_wstart(EEPROM);		// address the external EEPROM
	uc_write((BYTE)(fptr>>8));	// set the EEPROM write address
	uc_write((BYTE)fptr);
	uc_write((BYTE)(x>>8));		// write high byte of data
	uc_write((BYTE)(x));		// write low byte of data
	uc_stop();			// done

	fptr+=2;			// advance the file pointer
	delay_ms(10);			// allow time to write eeprom
	}

void file_writef(float val)		// write a float to the currnt file loc
	{
	fval x;				// union for byte access

	x.f=val;			// copy to union to allow byte access

	uc_wstart(EEPROM);		// address the external EEPROM
	uc_write((BYTE)(fptr>>8));	// set the EEPROM write address
	uc_write((BYTE)fptr);
	uc_write(x.b[0]);		// write data as 4 bytes
	uc_write(x.b[1]);
	uc_write(x.b[2]);
	uc_write(x.b[3]);
	uc_stop();			// done

	fptr+=4;			// advance the file pointer
	delay_ms(10);			// allow time to write eeprom
	}

BYTE file_readb(void)			// read a byte from the current file loc
	{
	BYTE x;

	uc_wstart(EEPROM);		// address the external EEPROM

	uc_write((BYTE)(fptr>>8));	// set the EEPROM write address
	uc_write((BYTE)fptr);
	uc_rstart(EEPROM);		// switch to read
	x=uc_read(0);			// read data
	uc_stop();			// done

	fptr++;				// advance the file pointer
	return(x);			// return the BYTE value
	}

WORD file_readw(void)			// read a word from the current file loc
	{
	WORD x;

	uc_wstart(EEPROM);		// address the external EEPROM

	uc_write((BYTE)(fptr>>8));	// set the EEPROM write address
	uc_write((BYTE)fptr);
	uc_rstart(EEPROM);		// switch to read
	x=uc_read(1);			// read high byte of data
	x<<=8;				// shift it up
	x+=uc_read(0);			// read low byte
	uc_stop();			// done

	fptr+=2;			// advance the file pointer
	return(x);			// return the BYTE value
	}

float file_readf(void)			// read a float from the current file loc
	{
	fval x;

	uc_wstart(EEPROM);		// address the external EEPROM

	uc_write((BYTE)(fptr>>8));	// set the EEPROM write address
	uc_write((BYTE)fptr);

	uc_rstart(EEPROM);		// switch to read
	x.b[0]=uc_read(1);		// read data as 4 bytes
	x.b[1]=uc_read(1);
	x.b[2]=uc_read(1);
	x.b[3]=uc_read(0);
	uc_stop();			// done

	fptr+=4;			// advance the file pointer
	return(x.f);			// return the float value
	}