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erasing eeprom content

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jelodavid

Joined: 03 Apr 2005
Posts: 22
Location: Laguna Philippines

erasing eeprom content

Posted: Tue Apr 19, 2005 3:48 pm

Hello all!

Kindly help me on how to erase eeprom content...

Here's my partial code..........

Code:

// Save data to internal eeprom-----------------------------------------
void save_data()
{
if (data1==0)
{
   lcd_putc("\fNo data to save...\n......Exiting");
   delay_ms(2000);
   return;
}
printf(lcd_putc,"\fSaving %lu to\ninternal memory",data1);
write_eeprom(address,make8(data1,0));
address++;
write_eeprom(address,make8(data1,1));
address++;
delay_ms(1000);
printf(lcd_putc,"\fMemory Save: %lu",data1);
delay_ms(1000);

}

// Recall data from internal eeprom--------------------------------------
void recall_data()
{
address=0;

   all_data = make16(read_eeprom(address+1),read_eeprom(address));
   delay_ms(30);

printf(lcd_putc,"\fMemory Recall:\n %lu",all_data);
delay_ms(3000);
}

// Reset data from internal eeprom--------------------------------------
void reset_data()
{
lcd_putc("\fResetting Data...");
delay_ms(500);
data1=0;
write_eeprom(address,data1);
lcd_putc("\fData reset");
delay_ms(500);
}

eeprom content will reset to zero if it's below 255 but nothing happen above 255

PCM programmer

Joined: 06 Sep 2003
Posts: 21708

Posted: Tue Apr 19, 2005 4:24 pm

Quote:

EEprom content will reset to zero if it's below 255 but nothing
happen above 255

Code:

// Reset data from internal eeprom------------------
void reset_data()
{
lcd_putc("\fResetting Data...");
delay_ms(500);
data1=0;
write_eeprom(address,data1);
lcd_putc("\fData reset");
delay_ms(500);
}

Your code would be better, for various reasons, if your functions used
parameter variables instead of using global variables.

Your problem is due to a misunderstanding of this function:
write_eeprom(address,data1);
The 2nd parameter, data1, is an 8-bit value. You can only write to
one byte of data eeprom each time the function is called. You're
assuming that it's a 16-bit value, and that you can erase two bytes
per function call. But you can't do that.

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