Re: [Discuss-gnuradio] [USRP-users] Fwd: RE: synchronize two USRP N 210

[Marcus Müller]

Hi Bashar,
thanks for following up on this :)

So, the idea was to replace "set_command_time()" by "set_start_time()",
and to generally omit the clearing of command times (as you then don't
even set any):

-initialize all three USRP_sink/source objects
-set the time
-set_start_time on all three of them
-start your flowgraph.

Best regards,
Marcus

On 11/28/2014 12:44 PM, Bashar Hussain wrote:
> Dear Marcus 
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> Thanks for your reply. 
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> So here is the code now  looks like:
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> self.uhd_usrp_source_1 = uhd.usrp_source(
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>             device_addr="addr=192.168.1.211",
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>             stream_args=uhd.stream_args(
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>                 cpu_format="fc32",
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>                 channels=range(1),
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>             ),
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>         )
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>         self.uhd_usrp_source_1.set_clock_source("external", 0)
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>         self.uhd_usrp_source_1.set_time_source("external", 0)
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>         self.uhd_usrp_source_1.set_time_unknown_pps(uhd.time_spec())
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>         self.uhd_usrp_source_1.set_samp_rate(100e6/dec_rate)
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>         self.uhd_usrp_source_1.set_center_freq(freq, 0)
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>         self.uhd_usrp_source_1.set_gain(rx_gain, 0)
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>         self.uhd_usrp_source_1.set_antenna("RX2", 0)
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>         
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>         
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>         self.uhd_usrp_source_0 = uhd.usrp_source(
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>             device_addr="addr=192.168.1.221",
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>             stream_args=uhd.stream_args(
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>                 cpu_format="fc32",
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>                 channels=range(1),
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>             ),
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>         )
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>         self.uhd_usrp_source_0.set_clock_source("external", 0)
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>         self.uhd_usrp_source_0.set_time_source("external", 0)
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>         self.uhd_usrp_source_0.set_time_unknown_pps(uhd.time_spec())
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>         self.uhd_usrp_source_0.set_samp_rate(100e6/dec_rate)
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>         self.uhd_usrp_source_0.set_center_freq(freq, 0)
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>         self.uhd_usrp_source_0.set_gain(rx_gain, 0)
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>         self.uhd_usrp_source_0.set_antenna("RX2", 0)
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>         
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>         time.sleep(1);
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>     
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>         cmd_time = self.uhd_usrp_source_1.get_time_last_pps()
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>         cmd_time0 = self.uhd_usrp_source_0.get_time_last_pps()
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>     
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>         real_seconds = uhd.time_spec_t.get_real_secs(cmd_time)
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>         real_seconds0 = uhd.time_spec_t.get_real_secs(cmd_time0)
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>     
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>         future_real_seconds = real_seconds + 1
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>         future_real_seconds0 = real_seconds0 + 1 
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>     
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>         future_cmd_time = uhd.time_spec_t(future_real_seconds)
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>         future_cmd_time0 = uhd.time_spec_t(future_real_seconds0)
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>      
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>         self.uhd_usrp_source_1.set_command_time(future_cmd_time)
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>         self.uhd_usrp_source_0.set_command_time(future_cmd_time0)
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>         self.uhd_usrp_source_1.set_start_time(future_cmd_time)
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>         self.uhd_usrp_source_0.set_start_time(future_cmd_time0)
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>         self.uhd_usrp_source_1.clear_command_time()
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>         self.uhd_usrp_source_0.clear_command_time()
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> Or I have to delete the clear_command_time lines ?
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>  
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> Regards ..
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> Bashar Mufid 
>
>
> Eng.Bashar Mufid 
> Research & Teaching Assistant
> Al-Quds University
> Faculty Of Engineering / Department of Electronics Engineering 
> Al-Quds - West Bank - Palestine 
> Tel:00972-56-8585085 
>
>
>> Date: Fri, 28 Nov 2014 12:42:27 +0100
>> From: address@hidden
>> To: address@hidden; address@hidden
>> Subject: Re: [USRP-users] Fwd: RE:  synchronize two USRP N 210
>>
>> Hi Bashar,
>>
>> I'll reply once you send your emails to the mailing list instead of me
>> individually.
>>
>> Best regards,
>> Marcus Müller
>>
>> On 11/28/2014 12:34 PM, Bashar Hussain wrote:
>>> Dear Marcus 
>>>
>>> Thanks for your reply. 
>>>
>>> So here is the code now  looks like:
>>>
>