[Tinyos-help] What do PageEEPROM's flush and sync do?

[Jacob Sorber]

Okay, that makes sense, but now I have no idea what is happening.  I am
writing data in 50 byte chunks to a single page in flash (which I erase
before writing).  After each write I call sync().  The first 4 writes seem
to work as intended (when I read the page, the flash is all 1s after the
data I have written).  After the 5th write, though 6 bytes of garbage are
appended  (page offsets 250-255).  Do you know why this might be happening.
I have verified that when I call PageEEPROM.write(), the "size" value is, in
fact, 50.

Thanks,
Jacob

On 2/6/07, David Gay <dgay42 at gmail.com> wrote:
>
> On 2/6/07, Jacob Sorber <jacob.sorber at gmail.com> wrote:
> > I am seeing some bizarre behavior, and I suspect that it is due to my
> not
> > understanding exactly what these two functions do.  I have not been able
> to
> > find any documentation on the subject, so any help would be great.
>
> flush starts writing the specified page to flash and signals
> completion "immediiately" (well, before the write completes). sync
> does the same thing, but only signals completion when the write is
> complete.
>
> Note that the pages are handled like a cache, so may be flushed anyway
> because of subsequent reads or writes. But if you want to ensure data
> is written, you do need to call sync or flush.
>
> David Gay
>
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