Wow, 1.3% error in your time sync...seems pretty good to me.
But I guess it's cumulative, eh?
I might suspect something causing you to miss a timer interrupt,
maybe the transmit task or something? You might try flashing the
LED on each sample and looking for a missing pulse with a logic
analyzer.
MS
Mike Deneen wrote:
Hello,
I have managed to implement the Vanderbilt Time Sync code along with
ADC-DMA code with the intent of streaming 1khz adc samples to a base
station. I have the ADC set up to sample at 1khz and then switch
buffers. The full buffer is processed and sent out in a 128 byte packet.
Right now, experimenting with two, I have read the global time, started
sampling, finished sampling, read the global time again. With two motes
taking 73 samples/buffer there is a finishing time difference of up to a
millisecond.
Is the ADC really sampling at 1khz? Is there a better way to align the
motes? How much drift is expected? It is important for me to sample at
the same time, mote to mote.
Thanks for any insight you can give.
-Mike
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