Hi Steve, On Mon, Nov 22, 2010 at 2:35 PM, steve ayer <[email protected]> wrote: > hi. > > miklos, you may be confusing the configurations among the various shimmer > revs, which have different pin layouts relative to the cc2420. on shimmer, > the sfd signal is routed to a capture-capable pin on the msp430; on > shimmer2, due to an oversight it was not, so a capture was manually > implemented using an interrupt. this oversight was corrected for span and > shimmer2r.
I am using shimmer2. I know that shimmer2 does not have the hardware capture feature and it is implemented in software. However, your implementation uses TMilli as a time source and the time synchronization on the CC2420 assumes that it has 32khz timers, otherwise the TimeSyncPacket interfaces always returns FALSE in isValid. > the code that you sent will break shimmer and shimmer2r, and the fix for > shimmer2 was committed in january. The code I have attached should be applied to shimmer2 only, since it does software time capture but uses the 32khz timer to do that! > silvan, how old is your tinyos-2.x codebase? is it from the current svn > repository at googlecode? > > i'll be happy to help untangle this problem if it stems from up to date > platform code. We use the latest SVN from google code. Best, Miklos > > -steve > > On 11/22/2010 03:14 AM, Miklos Maroti wrote: >> >> Hi Silvan, >> >> I think the problem is with the configuration of CC2420 on Shimmer. We >> have run into this as well. Can you please two files in your >> platforms/shimmer/chips/cc2420 with the ones I have attached and check >> if this fixes your problem? >> >> Miklos >> >> On Mon, Nov 22, 2010 at 1:57 AM, Omprakash Gnawali >> <[email protected]> wrote: >>> >>> ---------- Forwarded message ---------- >>> From: Silvan Nellen<[email protected]> >>> Date: Mon, Nov 8, 2010 at 7:36 AM >>> Subject: [Tinyos-help] Software auto acknowledgements break packet >>> timestamps in the C2420 driver >>> To: >>> "[email protected]"<[email protected]> >>> >>> >>> Hello, >>> >>> >>> >>> I’m trying to run the FTSP test application (revision 5215 of >>> http://tinyos-main.googlecode.com/svn/trunk) as described in >>> tinyos-2.x/apps/tests/TestFTSP/Ftsp/README.txt on Shimmer. At first >>> the nodes running TestFtspAppC didn’t seem to respond to the messages >>> sent out by the beacon mote (java FtspDataLogger reported nothing). >>> Using a packet sniffer I discovered that the FTSP motes send ACK >>> packets for each beacon message but they don’t send report messages >>> (which would then be picked up by the base station and ultimately be >>> displayed by the FtspDataLogger). >>> >>> >>> >>> I looked at the CC2420 driver source code in >>> tos/chips/cc2420/receive/CC2420ReceiveP.nc and used printf to see >>> what’s going on, and I think I found the problem: the outgoing ACK >>> messages trigger the SFD interrupt and cause a timestamp to be put in >>> to the timestamp queue (line 190). If this happens BEFORE the >>> timestamp of the incoming packet is read, the packet timestamp is >>> cleared and the timestamp queue gets flushed (lines 633-635). >>> Consequently all packets received by the FTSP test application contain >>> invalid timestamps and are thus ignored (line 67 in TestFtsp.nc). >>> >>> >>> >>> Does that make sense? Is this a known problem? Has FTSP ever been >>> tested with CC2420? >>> >>> >>> >>> As a temporary fix I added PFLAGS += -DCC2420_NO_ACKNOWLEDGEMENTS to >>> the Makefile and I get messages from the FTSP motes now, however this >>> fix doesn’t really address the cause of the problem… >>> >>> >>> >>> Silvan >>> >>> >>> >>> _______________________________________________ >>> Tinyos-help mailing list >>> [email protected] >>> https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help >>> >>> >>> >>> _______________________________________________ >>> Shimmer-users mailing list >>> [email protected] >>> https://lists.eecs.harvard.edu/mailman/listinfo/shimmer-users > > _______________________________________________ > Shimmer-users mailing list > [email protected] > https://lists.eecs.harvard.edu/mailman/listinfo/shimmer-users > _______________________________________________ Tinyos-help mailing list [email protected] https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
