Thanks. What about packet-level time sync as stated in TEP133<http://www.tinyos.net/tinyos-2.x/doc/html/tep133.html>? Is there any known issue of such time sync in the default cc2420 stack? I'm using it with CTP, but sometimes it seems even TimeSyncPacket.isValid() returns true, the timestamp seems to be invalid (this is detected by measurements such as time interval close to 2 ^ 32 ms). Because packet-level time sync is based on packet timestamping, so it should have issues as well, am I right?
The reason why I don't use cc2420x stack with CTP yet is that it constantly prompts compilation error: *$/tinyos-2.1.x/tos/chips/cc2420/CC2420TimeSyncMessage.h:46: redefinition of `nx_struct timesync_footer_t'* *$/tinyos-2.1.x/tos/chips/cc2420/CC2420TimeSyncMessage.h:46: warning: tag timesync_footer_t shadows enclosing struct/union/enum* *$/tinyos-2.1.x/tos/chips/cc2420/CC2420TimeSyncMessage.h:49: conflicting types for `timesync_footer_t'* *$/tinyos-2.1.x/tos/lib/rfxlink/layers/TimeSyncMessageLayer.h:58: previous declaration of `timesync_footer_t'* What changes are necessary to use packet-level time sync compatibly with CTP? Thanks very much. On Thu, Jun 16, 2011 at 2:53 PM, Janos Sallai <[email protected]>wrote: > Timestamping has known issues in the default cc2420 stack (telosb, > micaz, etc.) under heavy load. Try using the cc2420x stack. Compile > with "make telosb cc2420x". You'll need the latest sources from google > code. > > Janos > > On Thu, Jun 16, 2011 at 1:34 PM, Xiaohui Liu <[email protected]> wrote: > > I'm using the default one, I'm not sure how to use cc2420x. > > > > On Thu, Jun 16, 2011 at 1:50 PM, Janos Sallai < > [email protected]> > > wrote: > >> > >> Is this the default cc2420 stack, or do you use cc2420x? > >> > >> Janos > >> > >> On Thu, Jun 16, 2011 at 10:49 AM, Xiaohui Liu <[email protected]> wrote: > >> > Can anyone please give me some hint on what may be the cause? I'm > stuck > >> > here. I really appreciate your assistance. > >> > > >> > On Wed, Jun 15, 2011 at 4:57 PM, Xiaohui Liu <[email protected]> > wrote: > >> >> > >> >> Telosb. > >> >> > >> >> On Wed, Jun 15, 2011 at 4:54 PM, Hamid Rafiei < > [email protected]> > >> >> wrote: > >> >>> > >> >>> Hi, > >> >>> > >> >>> What is the platform you are using? > >> >>> > >> >>> > >> >>> > >> >>> > >> >>> > >> >>> Regards, > >> >>> > >> >>> > >> >>> Hamid Rafiei Karkvandi > >> >>> > >> >>> > >> >>> > >> >>> > >> >>> > >> >>> On Wed, Jun 15, 2011 at 2:36 PM, Xiaohui Liu <[email protected]> > wrote: > >> >>>> > >> >>>> Hi everyone, > >> >>>> > >> >>>> I'm using PacketTimeStamp interface to timestamp packet > transmission > >> >>>> and > >> >>>> reception, but I find isValid() returns FALSE more than 90% of the > >> >>>> time. Can > >> >>>> anyone help me understand what may go wrong? I'm timestamping in > >> >>>> sendDone() > >> >>>> and receive() event only and sending 1 packet per second. Any help > is > >> >>>> appreciated. > >> >>>> -- > >> >>>> -Xiaohui Liu > >> >>>> > >> >>>> _______________________________________________ > >> >>>> Tinyos-help mailing list > >> >>>> [email protected] > >> >>>> > >> >>>> > https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help > >> >>> > >> >> > >> >> > >> >> > >> >> -- > >> >> -Xiaohui Liu > >> > > >> > > >> > > >> > -- > >> > -Xiaohui Liu > >> > > >> > _______________________________________________ > >> > Tinyos-help mailing list > >> > [email protected] > >> > > https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help > >> > > > > > > > > > -- > > -Xiaohui Liu > > > -- -Xiaohui Liu
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