AVR-Chat

Graham,

 

Thanks for the answers and ideas.

 

I have a digital light dimmer whose intensity level is stored in RAM as an
8-bit variable.

 

When power is removed from the light, I want to save the dimmer level so
that when the light is turned ON again, the dimmer level is restored to its
previous value and the light behaves like an analog light with a dimmer
knob.

 

I cannot sense removal of power since the hardware is not in place to do so.
So, I am forced to save the dimmer value "often" enough to remember the last
level before shut-down.

 

Of course, I would only save the dimmer level when it changes.  A busybody
user might change it a lot, hence my need for a lot of storage cycles in the
EEPROM.

 

Benny 

 

  _____  

From: AVR-Chat@yahoogroups.com [mailto:AVR-Chat@yahoogroups.com] On Behalf
Of bayramdavies
Sent: Wednesday, December 12, 2012 2:17 PM
To: AVR-Chat@yahoogroups.com
Subject: [AVR-Chat] Re: ATmega88PA EEPROM Memory Life

 

  

--- In AVR-Chat@yahoogroups.com <mailto:AVR-Chat%40yahoogroups.com> , "Benny
Smith" <benny@...> wrote:
>
> ... if I wanted to save a byte frequently,
> I could use up the 100,000 cycles at one
> byte address and then switch to another
> byte address to store the next 100,000
> repetitions of my byte-save operation.

Sure. And to keep track of how may times you've written and erased the
EEPROM byte you're currently working with, you could keep the count in
EEPROM. Of course, you'd have to write and erase it frequently to keep
up-to-date, but not every cycle, and you could move this count to a fresh
byte by counting its erases in another byte, and so on.

Maybe you should tell us what you're trying to do and what your restrictions
are rather than having us sanity check half-baked schemes.

Graham.



  _____  

size=1 width="100%" noshade color=gray align=center> 

No virus found in this message.
Checked by AVG - www.avg.com
Version: 2013.0.2805 / Virus Database: 2634/5952 - Release Date: 12/11/12



[Non-text portions of this message have been removed]