AVR-Chat

--- In AVR-Chat@yahoogroups.com, "Larry Barello" <yahoo@b...> wrote:
>
> Sorry if I have missed the point of this thread...  But recently I
started
> using the Atmel 4mb data flash
(http://www.atmel.com/products/DataFlash/),
> cheap ($3 in singles) and very easy to use - simpler and cheaper
than the
> SPI EEprom I was using before.  And those data flash chips get
pretty big:
> 128mbit (16mb).  The main hurdle was ignoring the wacky 264 byte
"page" and
> treating it as if it were 2 x 256 pages, but every other "page" had
only 8
> bytes available, so I skipped it.  That was very simple: I just
shifted the
> linear 32 bit address and inserted a "0" in the 9th bit position before
> shifting out to the data flash. The rest was really simple: read a
page into
> the internal ram buffer, write your data on top, write page back
out.  It
> was about a screen full of code when I was done.
> 
> I have not looked into the SD cards, but since they support a simple SPI
> mode and use similar data flash chips, I suspect using them can
reduce to a
> simple R/M/W operation as well.  
> -----------
> Larry Barello
> www.barello.net
>

I think you got the topic correct.

I guess the memory got cheaper in the last year and also the size grew.

Dave