erase_eeprom() function not recognized with 12F683 compile

[orb]

Hi All,
I have used the erase_eeprom() function on a 16F526 successfully but
it will give me a "Undefined identifier -- erase_eeprom" when compiling it for my 12F683. The write_eeprom() function works well.
Any suggestions?

Here's my code:

[ckielstra]

The documentation in the CCS manual is limited and only says:

[orb]

Oh is that the case? I thought all baseline devices containing EEPROM used the same erase-all-eight-bytes technique.
Thanks for pointing that out.

I'll remove the erase_eeprom() function.

Thank you!!!!

[asmboy]

these look like key program parameters you are saving
and
i see what you want to do
but
there is a serious risk:

You are not writing a checksum to be sure the data - when read - IS VALID! ( kind of a small pic to implement a CRC check)

so after programming - on first run - you will have random or otherwise potentially useless/dangerous nonsense in flash .

Try - this
initialize a byte or word to some value - any value will do

then as you write the data to flash , create a running checksum
with that value as a seed. ( just add the data you are writing to the seed value)

And finally write that checksum to flash also - after your data

THEN on READBACK -
extract the values , INTO TEMP VARS , and sum them starting from the same checksum seed as when you stored them.
Next be sure that the checksum you wrote - is valid when you compare.
if so - use the vlaues read - if NO match sub safe values instead.

with int8 as a check seed - there is a 1 in 256 chance of corruption
with int16 a 1:65536 chance

it protects on an initial startup - since you can reject bad data and substitute safe - or initial conditions ..
and only properly saved data will be able to be restored

then you will have confidence in the performance of the program.