On Feb 22, 2010 11:25 AM, "tmk" <[email protected]> wrote:
Off topic:
I have also considered making a complete clone of the DS2490 (usb to 1
wire master) on an AVR chip. $30 is too much for a USB -> 1wire adapter!
An ATTiny chip should be able to handle it no problem
Would this be interesting? Is there a datasheet on the 2490 usb
interface? Owfs supports it, so I should be able to get what I need
from the source code, worst case
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For a datasheet on the USB aspects of the DS2490, see
http://datasheets.maxim-ic.com/en/ds/DS2490.pdf
However, you really need not be constrained by an existing design, at least
as far as OWFS is concerned. We can incorporate support for a new USB bus
master, just the many other 3rd party bus masters already supported.
At a minimum, the bus master should support RESET, bit write(and sense) and
strong power delivery at standard speed. Even better would be support for
byte read/sense, a better search ( feed in the sescrepancy information to
find the next device), overdrive, and 5V/12V delivery on other lines of the
RJ45 connector. Or even multiple electrically independent lines.
We use libusb for USB access, so designing to libusb would make sense.
Paul Alfille
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