Saving data to eeprom - Electronic Circuits Projects Diagrams Free

apricot_star · 17th August 2008, 12:04 PM

Does anyone know how to store data to EEPROM?
I am currenly using PIC18F2620.

Pommie · 17th August 2008, 12:17 PM

Have a read of this thread.

Mike.

apricot_star · 17th August 2008, 12:32 PM

Thank for the reply.
Actually, i know how is the routine like to write and read to eeprom. My problem is that i dunnno how to implement it. I suppose to store the calibration value of light sensor to the eeprom so that my main program will know it when my device is first power up. I just don't understand how is the things work from saving the value and read the value.

Here is the example of what have my friend done:

# define FCIN_ADDR 0x00

result= ReadEeprom(FCIN_ADDR);
result<<=8; // i dun understand why must it shift by 8
tem=ReadEeprom(FCIN_ADDR+1);// why must it increment by1
result+=tem;

Regards

Mike, K8LH · 17th August 2008, 01:26 PM

Why not ask your friend?

**3v0** · 17th August 2008, 02:43 PM

Quote:

Originally Posted by apricot_star

Thank for the reply.
Actually, i know how is the routine like to write and read to eeprom. My problem is that i dunnno how to implement it. I suppose to store the calibration value of light sensor to the eeprom so that my main program will know it when my device is first power up. I just don't understand how is the things work from saving the value and read the value.

Here is the example of what have my friend done:

# define FCIN_ADDR 0x00

//Reads the high byte and shifts it 8 to put it in the high byte of results.
result= ReadEeprom(FCIN_ADDR);
result<<=8;
// Read low byte and add it to the result which contains the high byte
tem=ReadEeprom(FCIN_ADDR+1);// why must it increment by1
result+=tem;

Regards

The above code reads a 16 bit value from the EEPROM 8 bits at a time.

Given that you did not understand what the <<= operator was you either need
to learn C or have you friend help you.

apricot_star · 18th August 2008, 02:02 AM

Thanks, i got it now =)

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17th August 2008, 12:04 PM	(permalink)
apricot_star	Saving data to eeprom Does anyone know how to store data to EEPROM? I am currenly using PIC18F2620.

17th August 2008, 12:17 PM	(permalink)
Pommie	Have a read of this thread. Mike.

17th August 2008, 12:32 PM	(permalink)
apricot_star	Thank for the reply. Actually, i know how is the routine like to write and read to eeprom. My problem is that i dunnno how to implement it. I suppose to store the calibration value of light sensor to the eeprom so that my main program will know it when my device is first power up. I just don't understand how is the things work from saving the value and read the value. Here is the example of what have my friend done: # define FCIN_ADDR 0x00 result= ReadEeprom(FCIN_ADDR); result<<=8; // i dun understand why must it shift by 8 tem=ReadEeprom(FCIN_ADDR+1);// why must it increment by1 result+=tem; Regards Last edited by apricot_star; 17th August 2008 at 12:38 PM.

17th August 2008, 01:26 PM	(permalink)
Mike, K8LH	Why not ask your friend?

18th August 2008, 02:02 AM	(permalink)
apricot_star	Thanks, i got it now =)