PIC16F914 EEPROM Usage

[edbfmi1]

I need a little help figuring out what command to use to store a variable in the EEPROM on the PIC16F914.

I have a machine that can be running in one of 4 various modes. I need to store either a "0" , "1" , "2" or "3" in memory so that if power is interrupted I can read the memory location on power up to startup in the mode it was in when power was lost.

Would I simply do something like this to store mode "2" for instance.

[Ttelmah]

So, start, what is 'STORED_MODE'?. Normally capitals are reserved for 'defines'. So, if a define, what is it defined as?. If it's a variable, what type is it (int etc.), and what does it contain?.
Then you refer to what you want to store in inverted commas. A string?.
Then remember that write_eeprom takes a long time (typically 5mSec), and can only be done a limited number of times (100K). If (for instance) this was done in a loop, you could kill the EEPROM in 500seconds.
Then what compiler version?. Some have faults.

[edbfmi1]

Hi Ttelmah,

Thanks for the quick reply.

STORED_MODE is the location in the EEPROM I am using to store the variable.
In my case I used the following define:

[edbfmi1]

Also it will only be written too a maximum of 10 times a day.
This should last well beyond my retirement

[edbfmi1]

One last thing.
I am simply storing a number. Either a 0 or a 1 or a 2 or a 3.

[temtronic]

hmm...it should have worked, but show us your code.Maybe between writing and reading something's gone 'funny'.

A printout of what should be stored and what is really there is necessary.
You can even just look at the eeprom from MPLAB.

hth
jay

[Gabriel]

Unless you have power failure detection you would save the "mode" only on startup or runtime mode change...

G.
_________________
CCS PCM 5.078 & CCS PCH 5.093