Hi Ben.
I'll take a look at the datasheets. One thought is that owfs does "lazy
resets" -- only sends a 1-wire reset pulse when the next command is sent.
Perhaps this doesn't release the DS2404?
Paul
On Wed, Oct 1, 2008 at 12:54 AM, Ben Griffith <[EMAIL PROTECTED]>wrote:
> Thanks Paul. I compiled the latest version tonight and now the owfs reads
> are working correctly. I'm having some trouble with 3-wire reads though,
> and it seems to be dependent on what I'm doing in owfs. The data sheet says
> that the 1-wire and 3-wire ports cannot be accessed simultaneously, so I
> know not to try that. But it seems like after I access any device on the
> 1-wire bus, I can no longer read from the 3-wire port of the DS2404. This
> happens whether I read a page on the DS2404 or reading the PIO of a DS2405.
> If I restart owserver I can again read from the 3-wire port. Just stopping
> owserver isn't enough, it has to be restarted. Another thing that seems to
> restore access to the 3-wire port is if I try to use tab-completion in the
> owfs directory. For example, if I type "ls /mnt/owfs/05.34<tab>" and the
> shell fills in the rest.. I don't even have to type the beginning of a
> device name... something to do with tab-completion bumps it back into a
> working state again.
>
> I'm using a USB 1W adapter - DS9490R.
>
> I just tried owhttpd to see what effect it has on the 3W port. The effects
> are similar to those of the owfs filesystem. If I click on a DS2405, the 3W
> reads on the DS2404 stop working. If I then click on "up" to go back to the
> index, the 3W reads work again.
> If I go into the DS2404 via owhttpd then the 3W port stops working, but it
> doesn't start working again when I click on "up" to go back to the index.
> It doesn't work until I open another device and then go back to the index.
>
> Is there anything else I should try?
>
> -Ben
>
>
>
> On Sat, Sep 27, 2008 at 9:45 PM, Paul Alfille <[EMAIL PROTECTED]>wrote:
>
>> 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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