Write Program EEPROM issue

[Seth]

I am writing an eeprom slot in the program memory, specifically address 0x02610. After writing the eeprom the first time, I read it back and verify that the slot was correctly written. The second time I write to the slot and attempt to read it back, however, the wrong value is returned. Is there something I am doing wrong?

It's a pic18f2620

code snippet is pretty simple:

#define AIR_CALIB_BYTE_ADDR1 0x02610

//write :
write_program_eeprom(AIR_CALIB_BYTE_ADDR1,airPressureMultiplierEEPROM);

//read:
valueReadBack = read_program_eeprom(AIR_CALIB_BYTE_ADDR1);

[Ttelmah]

Read the manual....
The write_program_eeprom function, _does not erase_. If you are writing a second time, you need to erase the block first.

Best Wishes

[Seth]

I seem to recall reading somewhere on this site that the function write_program_eeprom performs the erase as part of its functionality. I guess I am wrong on that assumption.


I've figured out a work around.

[Ttelmah]

Write_program_memory, does erase (but remember a whole block has to be erased). Write_program_eeprom doesn't. Look in the manual under 'write_program_memory', which explains the differences.

Best Wishes