Hi Janos, I have done the modifications as you have said and also used the NoSleepC component of your implementation in tinyos-2.x-contrib repository. But I don't get tight skew values on a line of 5 iris sensor nodes.
Here are the results after a 15 minute run: 1287678021203: [nodeid=0x1] [clock=0x1f3fc724] 1287678021250: [nodeid=0x2] [clock=0x1f3fc76a] 1287678021294: [nodeid=0x3] [clock=0x1f3fc75d] 1287678021350: [nodeid=0x4] [clock=0x1f3fc6ae] 1287678021398: [nodeid=0x5] [clock=0x1f3fc47d] Why am I measuring such big clock skew in this small network?? Any suggestions? 2010/10/18 Janos Sallai <[email protected]> > Sinan, > > It's not there, but it's not terribly complicated to accomplish. Just > take a look at TimeSyncC and TimeSync32kC, and based on those, come up > with your TimeSyncMicroC. As far as I can tell, this is the only file > you'll need to cook for yourself, you don't need to touch anything > else. > > A couple of notes: > - On the iris, the interface provided by TimeSyncMessageC that gives > you microsecond precision packet-level timesync is called > TimeSyncAMSendRadio. > - You can get microsecond-precision local time from LocalTimeMicroC, > however, time will stop when the mote goes to sleep. You will need to > keep the MCU awake all the time to get FTSP to work properly. There > are a couple of different ways to do this, for example by having a > component that provides McuPowerOverride and the lowestState function > always returns ATM128_POWER_IDLE. You'll need to wire this component > to McuSleepC. > > Janos > > On Sat, Oct 16, 2010 at 4:33 AM, Sinan Yildirim <[email protected]> > wrote: > > Hi all, > > > > I have a question on getting microsecond precision using FTSP on Iris > > platform. Current version of tinyos 2.1.1 does not include components and > > modules in tos/lib/ftsp directory in order to achieve microsecond > > precision. As far as I know, previous version of tinyos (1.x) had a > support > > for getting microsecond precision using FTSP. > > > > Has anybody a modified version of the FTSP code for tinyos 2.1.1 in order > to > > get microsecond precision global time value? Is it possible to share it > > here? I want to test this code on a line topology of 20 Iris motes. > > > > Thanks for your helps, > > > > Sinan. > > > > > > > > _______________________________________________ > > 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
