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 >
HplCC2420InterruptsC.nc
Description: Cdf file
HplCC2420InterruptsP.nc
Description: Cdf file
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