Hi Paul,
I've taken another look at it and it seems like the write actually is
working. Before, I had an Arduino sketch loaded that was also poking at the
DS2404. Now, with a different sketch that doesn't touch the DS2404, writing
via owfs seems to work.
The reading is still not quite right... a read of any page shows that page
and everything after it, and then some garbage beyond the last page.
Here's what I did, and what I got back from it:
I wrote "1234567890123456789012345678901" to each page (0-15).
When I cat page.0 I see all 16 copies of that string, followed by what is
probably the 30 timekeeping registers, followed by all FF bytes, for a total
of 4096 bytes returned.
When I cat page.15 I see 1 copy of that string, followed by the 30
timekeeping registers, followed by all FF bytes, again for a total of 4096
bytes.
page.ALL seems to work... I see all 16 pages and nothing more.
When I cat "memory" I see the same behavior as with page.0.
I'll be using owperl eventually, so I guess I should be all set with reading
ranges or individual bytes of memory.
Let me know if you want me to try out a fix.
Thanks
-Ben
On Wed, Sep 24, 2008 at 5:05 PM, Paul Alfille <[EMAIL PROTECTED]>wrote:
> The DS2404 has never really been tested. I'll work with you to see if we
> can make it work.
>
> As for accessing just parts of memory, it's not really possible via the
> shell. The underlying libow API supports writes (and reads) with offsets and
> a length. owcapi supports this. owperl supports this.
>
> Paul Alfille
>
> On Wed, Sep 24, 2008 at 4:57 PM, Ben Griffith <[EMAIL PROTECTED]>wrote:
>
>> Hi,
>>
>> I've got a few DS2404 chips and I'm playing around with them and an
>> Arduino. I've got the Arduino connected to the 3-wire port and my laptop
>> connected via a USB dongle to the 1-wire port. The DS2404 is getting +5V
>> and ground from the Arduino board. My laptop is running Gentoo with owfs
>> 2.7-p4. For starters I'd like to just write to memory via one port and see
>> the result via the other. I'm having trouble writing to memory via owfs and
>> seeing the result also via owfs. I've never played around with a 1-wire
>> memory device before, only temperature and switch devices, so maybe I'm
>> doing something wrong. I tried "cat pages/page.0" and get what seems like a
>> whole lot more than 32 bytes worth of garbage characters. If I then "echo
>> 1234567890 > pages/page.0" and do "cat pages/page.0" again I get the
>> expected (to me anyway) "1234567890". But then if I cat the same thing
>> again a minute later it's back to the same garbage characters as before.
>> I'm guessing that the 1234567890 I see is just cached from the attempted
>> write.
>>
>> Also, it looks like the only way to access the memory is a page at a time
>> or all at once. Is there any way to access a byte at a time, or a range of
>> bytes other than a whole page?
>>
>> Has anyone else tried using this device? I know it's been discontinued by
>> Maxim, but I have a few I'd like to try out in a project.
>>
>> Thanks,
>> Ben
>>
>> -------------------------------------------------------------------------
>> This SF.Net email is sponsored by the Moblin Your Move Developer's
>> challenge
>> Build the coolest Linux based applications with Moblin SDK & win great
>> prizes
>> Grand prize is a trip for two to an Open Source event anywhere in the
>> world
>> http://moblin-contest.org/redirect.php?banner_id=100&url=/
>> _______________________________________________
>> Owfs-developers mailing list
>> Owfs-developers@lists.sourceforge.net
>> https://lists.sourceforge.net/lists/listinfo/owfs-developers
>>
>>
>
> -------------------------------------------------------------------------
> This SF.Net email is sponsored by the Moblin Your Move Developer's
> challenge
> Build the coolest Linux based applications with Moblin SDK & win great
> prizes
> Grand prize is a trip for two to an Open Source event anywhere in the world
> http://moblin-contest.org/redirect.php?banner_id=100&url=/
> _______________________________________________
> Owfs-developers mailing list
> Owfs-developers@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/owfs-developers
>
>
-------------------------------------------------------------------------
This SF.Net email is sponsored by the Moblin Your Move Developer's challenge
Build the coolest Linux based applications with Moblin SDK & win great prizes
Grand prize is a trip for two to an Open Source event anywhere in the world
http://moblin-contest.org/redirect.php?banner_id=100&url=/
_______________________________________________
Owfs-developers mailing list
Owfs-developers@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/owfs-developers
