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[Discuss-gnuradio] timestamp counter-extra ticks in 1st frame
From: |
Pham, Thanh |
Subject: |
[Discuss-gnuradio] timestamp counter-extra ticks in 1st frame |
Date: |
Thu, 02 Apr 2009 19:30:32 -0600 |
I am using the two lines in the rx_nop_handler.h to print out the
timestamp.
printf("W0: %08x TS: %08x\n", metadata->word0,
metadata->timestamp);
printf("I0: %08x\n", items[0]);
Looking at the timestamp that was printed out from usrp2_fft.py, I
notice that there is always a few extra ticks in the first frame.
I'm trying to understand why. Does someone have an explanation? Thanks!
TS (hex) TS(decimal) # of ticks in frame
(decim_rate=16)
507c5e55 1350327893
507c7594 1350333844 5951 (1st frame has 15 extra ticks,
this number changes with decimation rate but not consistent)
507c8cc4 1350339780 5936
507ca3f4 1350345716 5936
507cbb24 1350351652 5936
507cd254 1350357588 5936
507ce984 1350363524 5936
507d00b4 1350369460 5936
507d17e4 1350375396 5936
507d2f14 1350381332 5936
507d4644 1350387268 5936
507d5d74 1350393204 5936
507d74a4 1350399140 5936
507d8bd4 1350405076 5936
507da304 1350411012 5936
507dba34 1350416948 5936
507dd164 1350422884 5936
507de894 1350428820 5936
507dffc4 1350434756 5936
507e16f4 1350440692 5936
507e2e24 1350446628 5936