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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