Wrong time stamp in linux

jianbintang · July 2017

Hi, I've raised an issue in https://github.com/OpenBCI/OpenBCI_GUI/issues/176. Since no one answers for now, I re-post to here. Any help are wecome!

Several months ago, I've raised an issue about wrong time stamp in windows which is here: #129
After I modify the latency and buffer, it is much better. However, when I try to collect from linux(ubunu 16.04), I saw similar problems: the time interval (last column )in the raw data seems not increase evenly (~0.004ms). You can find it is ended 280,280,280 3 times. Any solutions?
I used cyton board and its usb dongle.

Thanks very much!

Here is some piece of raw data.
%OpenBCI Raw EEG Data
%
%Sample Rate = 250.0 Hz
%First Column = SampleIndex
%Last Column = Timestamp
%Other Columns = EEG data in microvolts followed by Accel Data (in G) interleaved with Aux Data
22, -187500.02, -187500.02, -187500.02, -187500.02, 178187.92, 178172.55, -187500.02, -187500.02, 0.000, 0.000, 0.000, 08:53:17.055
23, -187500.02, -187500.02, -187500.02, -187500.02, 178161.22, 178145.92, -187500.02, -187500.02, 0.000, 0.000, 0.000, 08:53:17.070
24, -187500.02, -187500.02, -187500.02, -187500.02, 178153.88, 178138.69, -187500.02, -187500.02, 0.000, 0.000, 0.000, 08:53:17.071
25, -187500.02, -187500.02, -187500.02, -187500.02, 178168.39, 178153.09, -187500.02, -187500.02, 0.000, 0.000, 0.000, 08:53:17.072
26, -187500.02, -187500.02, -187500.02, -187500.02, 178174.53, 178159.22, -187500.02, -187500.02, 0.000, 0.000, 0.000, 08:53:17.072
27, -187500.02, -187500.02, -187500.02, -187500.02, 178155.20, 178139.80, -187500.02, -187500.02, 0.060, 0.028, 1.000, 08:53:17.077

75, -187500.02, -187500.02, -187500.02, -187500.02, 177865.61, 177850.09, -187500.02, -187500.02, 0.000, 0.000, 0.000, 08:53:17.269
76, -187500.02, -187500.02, -187500.02, -187500.02, 177869.05, 177853.56, -187500.02, -187500.02, 0.000, 0.000, 0.000, 08:53:17.280
77, -187500.02, -187500.02, -187500.02, -187500.02, 177850.67, 177835.13, -187500.02, -187500.02, 0.000, 0.000, 0.000, 08:53:17.280
78, -187500.02, -187500.02, -187500.02, -187500.02, 177825.33, 177809.69, -187500.02, -187500.02, 0.054, 0.030, 1.002, 08:53:17.280
79, -187500.02, -187500.02, -187500.02, -187500.02, 177818.42, 177802.89, -187500.02, -187500.02, 0.000, 0.000, 0.000, 08:53:17.283
80, -187500.02, -187500.02, -187500.02, -187500.02, 177836.27, 177820.77, -187500.02, -187500.02, 0.000, 0.000, 0.000, 08:53:17.289