You problem is essentially the length of the read wasn't being reduced
properly. I think this was corrected in the current version. (FUSE uses a
4096 byte buffer).
Paul Alfille
On Wed, Sep 24, 2008 at 10:24 PM, Ben Griffith <[EMAIL PROTECTED]>wrote:
> 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
>>>
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