I suppose I should just stay out of it, but I thought we were talking about a user level Timer...being reset by a "kernel" level event that is not entirely related?
anyway, thanks for he clear explanation. MS Roy Shea wrote: > Howdy, > >> ummm....what's an SFD? > >>> Start of Frame Delimiter. It's a part of MAC header. > > Yup. At the physical layer a 802.15.4 frame starts with a > synchronization header that includes a preamble sequence and then the > SFD. Something like four bytes of 0x00 (the preamble sequence) and then > an 0xA7 (the SFD). > > The CC2420 has a lot of support for 802.15.4 framing, so I'm guessing > (but not completely sure!) that TinyOS exploits this. Perhaps one of > the TEPs go into more detail on this? > > Regardless, look at section 16 of the CC2420 data sheet for some more > gory details of the SFD and its relation to the CC2420. Then you can > checkout: > > CC2420Receive.nc > CC2420ReceiveP.nc > CC2420TransmitC.nc > > for how the SFD is being used in the TinyOS 2.x CC2420 driver. > > Hope that helps! > -Roy > _______________________________________________ > Tinyos-help mailing list > [email protected] > https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help _______________________________________________ Tinyos-help mailing list [email protected] https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
