Hi everyone, I'm using packet-level time sync (T32khz) and notice even though the offset between the clock of the sender and receiver is approximately a linear function of time mostly, there are sporadic outliers<http://www.cs.wayne.edu/xliu/downloads/offset_vs_local_time.jpg>. Are they normal? They can deviate from the regression line by as large as 60 ticks (1 tick is about 1/32 ms), making time sync not precise enough for my application.
I suspect the problem may be caused by timestamping bug in the default CC2420 radio stack and wonder if timestamping is working in TinyOS 2.1.2. There are conflicting claims, some<http://docs.tinyos.net/tinywiki/index.php/PacketTimeStamp_CC2420_bug>indicating it is while others not<http://www.mail-archive.com/[email protected]/msg42489.htmlhttp://www.mail-archive.com/[email protected]/msg42489.html>. Can anybody give me some definite answer, please? Thanks. -Xiaohui Liu TelosB TinyOS 2.1.2
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