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future
Joined: 14 May 2004
Posts: 330
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| Struct to eeprom write routine, saving only different bytes. |
 Posted: Mon Jan 10, 2005 3:54 pm |
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This routine was already posted by me in the past.
Now I want it to save only the modified bytes, but it doesnt work. Only a test to verify if the data is different was added.
Did I something wrong?
| Code: | if(!EECON1bits.WR)
if(eeprom_count<sizeof(cfg))
{
EEADR=eeprom_count;
EEDATA=*(&cfg+EEADR);
if(EEDATA!=read_eeprom(EEADR))
{
disable_interrupts(GLOBAL);
EECON1bits.EEPGD=0; // point to data memory
EECON1bits.WREN=1; // enable writes
EECON2=0x55;
EECON2=0xAA;
EECON1bits.WR=1; // begin write
enable_interrupts(GLOBAL);
}
eeprom_count++; // increment index pointer
}
else {
eeprom_count=0;
EECON1bits.WREN=0; // disable writes
} |
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Thomas Blake
Joined: 18 Jan 2004
Posts: 22
Location: Burbank CA
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| Re: Struct to eeprom write routine, saving only different by |
| Posted: Mon Jan 17, 2005 12:25 pm |
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| future wrote: | Now I want it to save only the modified bytes, but it doesnt work. Only a test to verify if the data is different was added.
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Why not use the CCS functions? Using CCS functions,
if (read_eeprom(i) != n) write_eeprom(i, n);
where i is the address and n is the data, works fine as a conditional eeprom write for any purpose.
But this reminds me of something I've wanted to ask the forum - does the Microchip EEPROM write algorithm automatically not do equal overwrites, as part of its endurance-enhancement process? |
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