18F4520 EEPROM question.

[d0zrisnot]

I'm trying to make a program to store integers into my EEPROM and then generate them out via USART onto hyperterminal. So far I've gotten as far as storing strings like this into the EERPOM and it successfully reads out onto the LCD:

EEADR=lol;
EEDATA=sizeof(f);
EE_WRT();

But when I try using integers:

//WRITE TO EEPROM
	count=0;
	for(f=0;f<8;f++)
	{
		EEADR=lol;
		EEDATA=sizeof(f);
		EE_WRT();
		count++;
		lol++;
	}
	EECON1bits.WREN=0;

//READ FROM EEPROM	
	lol=0;
	for(f=0;f<count;f++)
	{
		EEADR=lol;
		test=EE_READ();
		cursor_set(0,lol);
		WriteC(test);
		count++;
		lol++;
		Delay10KTCYx(100);
	}
	while(1);

It all comes out as gibberish on the LCD Is this a problem with the LCD or is there some dec-hex conversion I'm missing?


Whole code:

#include <p18f4520.h>
#include <stdio.h>
#include <system4520.h>
#include <delays.h>

void EE_WRT(void);
void SerTx(unsigned char);
unsigned char EE_READ(void);

void main()
{
	int f, lol=0, count=0;
	unsigned char test;

	lcd_init();
	clear_screen();
	
//WRITE TO EEPROM
	count=0;
	for(f=0;f<8;f++)
	{
		EEADR=lol;
		EEDATA=sizeof(f);
		EE_WRT();
		count++;
		lol++;
	}
	EECON1bits.WREN=0;

//READ FROM EEPROM	
	lol=0;
	for(f=0;f<count;f++)
	{
		EEADR=lol;
		test=EE_READ();
		cursor_set(0,lol);
		WriteC(test);
		count++;
		lol++;
		Delay10KTCYx(100);
	}
	while(1);
}

void EE_WRT()
{
	EECON1bits.EEPGD=0;
	EECON1bits.CFGS=0;
	EECON1bits.WREN=1;
	INTCONbits.GIE=0;
	EECON2=0x55;
	EECON2=0xAA;
	EECON1bits.WR=1;
	INTCONbits.GIE=1;
	while(!PIR2bits.EEIF);
	PIR2bits.EEIF=0;
}

unsigned char EE_READ()
{
	EECON1bits.EEPGD=0;
	EECON1bits.CFGS=0;
	EECON1bits.RD=1;
	return(EEDATA);
}

void SerTx(unsigned char c)
{	
	while(PIR1bits.TXIF==0);
	TXREG=c;
}

 

[Ian Rogers]

You are storing 16 bits in a 8 bit space... To write to eeprom you need to send the high byte AND the low byte to two separate locations... Then retrieve them in the same order.

 

[d0zrisnot]

Thanks, Ian! Will try it out later when I'm not so caught up