Basically, you have a readmem(pos,length,buffer) and
writemem(pos,lenght,buffer) that cover practically any situations.
the only difficulty could be the CRC16 that your avr has to calculate for
data integrity.
for read, up to 255 bytes could be read at once, for write, as crc is
checked before write commit, up to 16bytes max (size of working buffer) per
writes.
By default, 128bytes are exposed by 0xfc devices, but the addressable range
fit in 16bits.
If less than 128bytes need to be exposed on your avr, simply mask upper
address bits to roll over your effective area.
On owfs side, even without changes, you could then access the avr memory via
the memory property that returns the 128bytes. Also, for debugging purpose,
a writebyte property accepts a word value: high 8bit are assumed as low
address, and low 8bits are the value to write.
Pascal
www.brain4home.eu
2010/2/14 <[email protected]>
> I'll have to look at your structure.
>
> For mine, i was planning on just having 2 or 4 commands: readmem(),
> writemem(), readbyte(byte#), writebyte(byte#)
>
> if yours is similar, i don't see any reason not to.
>
> -tmk
>
>
> ----- Original Message -----
> From: "Pascal Baerten" <[email protected]>
> To: "OWFS (One-wire file system) discussion and help" <
> [email protected]>
> Sent: Sunday, February 14, 2010 1:29:01 AM GMT -08:00 US/Canada Pacific
> Subject: Re: [Owfs-developers] How can i get a slave serial number
> allocated?
>
> Hi tmk,
>
> Well, I'm nearly sure that maxim-dallas will not accept to assign family id
> to others. Instead of facing an explicit no way, I just count on
> maxim-dallas tolerance and selected an unassigned familly id near the end of
> the range...
> To avoid consuming anarchically multiple family id, chips support a simple
> command (read type 0x12) to identify chip model.
>
> There are still enhancement needed to have OWFS supporting dynamic property
> assignement but the idea is to have within the same 0xfc family multiple
> device types corresponding to a separate directory.
>
> If you could conform to the simple set of 0xfc commands, why not share this
> family id?
>
> Pascal
>
>
> 2010/2/14 <[email protected]>
>
>> Hi folks,
>>
>> This one's probably mostly for Paul, but Pascal might know too :)
>>
>> I'm doing some solar heat collection automation, and i was going to try
>> and hook an arduino (well, actually just an AVR, but close enough) up to the
>> 1-wire bus, so i could have all my info in the same place.
>>
>> I'd have to write some code to emulate a 1-wire slave device, and i was
>> wondering if I can just pick any slave ID/serial #/family ID or if there is
>> a special experimental range.
>>
>> Hope someone on here knows the answer.
>>
>> Cheers
>> -tmk
>>
>>
>> ------------------------------------------------------------------------------
>> SOLARIS 10 is the OS for Data Centers - provides features such as DTrace,
>> Predictive Self Healing and Award Winning ZFS. Get Solaris 10 NOW
>> http://p.sf.net/sfu/solaris-dev2dev
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>> [email protected]
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>>
>>
>
>
> --
> Pascal
>
> ------------------------------------------------------------------------------
> SOLARIS 10 is the OS for Data Centers - provides features such as DTrace,
> Predictive Self Healing and Award Winning ZFS. Get Solaris 10 NOW
> http://p.sf.net/sfu/solaris-dev2dev
>
> _______________________________________________ Owfs-developers mailing
> list [email protected]
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>
>
> ------------------------------------------------------------------------------
> SOLARIS 10 is the OS for Data Centers - provides features such as DTrace,
> Predictive Self Healing and Award Winning ZFS. Get Solaris 10 NOW
> http://p.sf.net/sfu/solaris-dev2dev
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>
--
Pascal
------------------------------------------------------------------------------
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