uhmm, could you send a serial dump ? or something to explain in bytes
what´s happening?
2011/11/29 nick <[email protected]>
> Hi
>
> I'm working on a custom 1-wire slave (IR sender for some air con
> units), and I picked the DS2431 to emulate for exposing a memory mapped
> interface to the IR sender. The IR sender (already done) and DS2431 code
> is coming together nicely in a 12F683 at 4MHz. The master is a LinkUSB,
> which now reports 1.5 for the firmware, so I patched the link driver to
> recognise it as a version 1.4 device.
>
> So far my slave shows up in the file system, and reading data from it
> works, though isn't required. I have a problem when implementing the
> write scratchpad feature though, as a DS2431 should TX an inverted CRC16
> of the received command, address and data, but there are no read slots
> coming from the master for the CRC after it sends the 8 bytes of
> scratchpad data. I may have missed something, but I'm not sure what and
> would appreciate any pointers. It appears that the CRC would simply
> dropped by a slave as it cannot be sent. I also get a CRC error on a
> read scratchpad operation at the moment, but that may well be an error
> in my slave, though I have the CRC16 algorithm correct and tested.
>
> Last, the selection of a DS2431 is arbitrary, and if there's any
> recommendation for a different memory oriented part to emulate then the
> choice can easily be changed. It just needs to be a part that has about
> 8 bytes or so of writeable address space.
>
> Nick
>
>
>
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--
Roberto Spadim
Spadim Technology / SPAEmpresarial
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contains a definitive record of customers, application performance,
security threats, fraudulent activity, and more. Splunk takes this
data and makes sense of it. IT sense. And common sense.
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