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Re: [Discuss-gnuradio] How do I capture of the time of USRP N210 samples
From: |
LD Zhang |
Subject: |
Re: [Discuss-gnuradio] How do I capture of the time of USRP N210 samples with host computer system time? |
Date: |
Fri, 4 Jan 2013 13:15:21 -0800 |
Hi Josh,
Thanks for replying. I have some thoughts on using the "set_start_time".
Please see my comments and questions below:
=========================================================
There is a set_start_time() call. setting this will effect what time the
streaming begins when the flow graph starts
>>>
Once the set_time_now command is performed. I consider the USRP have the
same (or approximately the same) time as the host computer, correct?
The set_start_time() call looks nice, but it requires a time passed to it. I
currently don't know how to dynamically call the set_start_time() command
with a variable of system time in hour:min:sec.microsecond format. I found a
discussion a while ago on some problems with the set_start_time. Someone was
complaining that the time-out window in the cpp code is too short so a
future scheduled time did not work.
Thinking about what I need to achieve, the set_start_time command is
certainly good to make to work. But maybe I have an easier task here. Since
the time is already sync'd, and presuming that I can get the time tag of the
first sample, it is OK if the start time is off a bit(as long as it doesn't
jump around by more than 0.1 seconds each time I perform the same function),
all I need is to know the time of the start sample referenced to the host
system time. So I say all I need right now is to get the time tag of the
beginning sample and that would suffice, just to make it easier.
>>>
Also, as an alternative, there is access to the issue_stream_cmd(). You can
leave the flow graph running and issue commands to turn streaming on and
off, schedule bursts, etc...
>>>
I will try to make the previous approach to work before I mess with this
one.
LD
- [Discuss-gnuradio] How do I capture of the time of USRP N210 samples with host computer system time?, LD Zhang, 2013/01/04
- Re: [Discuss-gnuradio] How do I capture of the time of USRP N210 samples with host computer system time?, John Malsbury, 2013/01/04
- Re: [Discuss-gnuradio] How do I capture of the time of USRP N210 samples with host computer system time?, LD Zhang, 2013/01/04
- Re: [Discuss-gnuradio] How do I capture of the time of USRP N210 samples with host computer system time?, Josh Blum, 2013/01/04
- Re: [Discuss-gnuradio] How do I capture of the time of USRP N210 samples with host computer system time?, LD Zhang, 2013/01/04
- Re: [Discuss-gnuradio] How do I capture of the time of USRP N210 samples with host computer system time?, Josh Blum, 2013/01/04
- Re: [Discuss-gnuradio] How do I capture of the time of USRP N210 samples with host computer system time?,
LD Zhang <=
- Re: [Discuss-gnuradio] How do I capture of the time of USRP N210 samples with host computer system time?, Josh Blum, 2013/01/04
- Re: [Discuss-gnuradio] How do I capture of the time of USRP N210 samples with host computer system time?, LD Zhang, 2013/01/04
- Re: [Discuss-gnuradio] How do I capture of the time of USRP N210 samples with host computer system time?, LD Zhang, 2013/01/04
- Re: [Discuss-gnuradio] How do I capture of the time of USRP N210 samples with host computer system time?, Marcus D. Leech, 2013/01/04
- Re: [Discuss-gnuradio] How do I capture of the time of USRP N210 samples with host computer system time?, LD Zhang, 2013/01/04
- Re: [Discuss-gnuradio] How do I capture of the time of USRP N210 samples with host computer system time?, LD Zhang, 2013/01/07
- Re: [Discuss-gnuradio] How do I capture of the time of USRP N210 samples with host computer system time?, Josh Blum, 2013/01/07
- Re: [Discuss-gnuradio] How do I capture of the time of USRP N210 samples with host computer system time?, Marcus D. Leech, 2013/01/07
- Re: [Discuss-gnuradio] How do I capture of the time of USRP N210 samples with host computer system time?, LD Zhang, 2013/01/16
- Re: [Discuss-gnuradio] How do I capture of the time of USRP N210 samples with host computer system time?, Josh Blum, 2013/01/16