On Sat, 21 Apr 2007, Paul Alfille wrote: > The problem isn't technical -- Louis Swart does it (PIC based) in his LCD > controller. > > Dallas/Maxim restricts 1-wire slaves (their patents, intellectual property, > and "quality assurance"), while making bus master design freely available > and unrestricted. I think it's a poor business decision, limitting their > market, mindshare, etc, but they seem to have the right.
I agree, this seems rather stupid (and probably explains the lack of new products built around it). > The DS2408 can also talk to a microprocessor a byte at a time, with a strobe > line to coordinate data transfer. We'd have to do some additions to OWFS to > support that mode, but it's quite doable. Yes, my friend is prototyping this approach. But it's ugly, uses up 9 port pins, requires the PIC to interrupt to handle data (rather than reading from shared memory as with the 2404) and requires another layer of checksumming. The 2404 based approach was very elegant (although allowing bus mastering would make it the ultimate low cost sensor/actuator networking interface). I don't suppose dallas/maxim are amenable to listening to us mere hobiests... njh ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ Owfs-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/owfs-developers
