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preserve eeprom data

 
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td
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preserve eeprom data
PostPosted: Sun Oct 23, 2005 8:24 pm     Reply with quote
hello all, i wanted to know how i could preserve the eeprom data when i am reprogramming my pic18f252 microcontroller. i am using PICstartplus programmer with MPLAB. thanks much...

TD
Mark



Joined: 07 Sep 2003
Posts: 2838
Location: Atlanta, GA

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PostPosted: Mon Oct 24, 2005 6:58 am     Reply with quote
Uncheck the box that programs the eeprom Idea
TD
Guest
PostPosted: Mon Oct 24, 2005 1:57 pm     Reply with quote
thanks for your reply.

I unchecked the Program Data EEPROM and it works !

Okay this is what I followed. After enabling the programmer > Erase Flash Device > Program for downloading the 1st program

I wrote to the eeprom and checked it as well and it seems to be fine.

Code:
Code:

   // would have received the characters to store in data eeprom from   
   // RS 232 input but here i am just showing some character
    write_eeprom(20,'1');
    write_eeprom(21,'5');
    write_eeprom(22,'2');
    write_eeprom(23,'5');

    v1 = read_eeprom(20) - 0x30;
    v2 = read_eeprom(21) - 0x30;
    v3 = read_eeprom(22)- 0x30;
    v4 = read_eeprom(23) - 0x30;

    if( 1 == v1 && 5 == v2 && 2 == v3 && 5 == v4)
       Output_high(Pin_C5);
    else
       Output_high(Pin_C3);

So the data eeprom at 20, 21, 22, 23 had '1,'5','2','5' since the proper LED was ON.

Now I reprogram the pic without erasing the eeprom. I compile/run the new code and then Enabled the programmer. And then clicked on Program/verify and unchecked DATA EEPROM > click program. thanks much

ps: I am sorry I posted this in another thread as well as part of another question[/code]
TD
Guest
PostPosted: Mon Oct 24, 2005 2:20 pm     Reply with quote
It does not work if I follow the procedure I had written in the above message. Please let me where I am making a mistake.
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