Re: [Discuss-gnuradio] Questions about synchronize usrp2 via mimo cable

[Josh Blum]

On 07/24/2013 08:25 PM, yeran wrote:
> Hi all, 
> I am trying to study STBC using USRP2 and have some questions about how to 
> use mimo cable.
> 
> I followed the instruction on ettus but i dont understand 'Configuring the 
> slave' part
> http://files.ettus.com/uhd_docs/manual/html/usrp2.html#using-the-mimo-cable
> ====
> Configuring the slave
> In order for the slave to synchronize to the master over MIMO cable,
> the following clock configuration must be set on the slave device:
> 
> uhd::clock_config_t clock_config;
> clock_config.ref_source = uhd::clock_config_t::REF_MIMO;
> clock_config.pps_source = uhd::clock_config_t::PPS_MIMO;
> usrp->set_clock_config(clock_config, slave_index);
> ===
> I wonder where should I add these lines?

The code you have below is correct. The code snippet in the docs using
clock_config reflects an older API. I will correct this. Thanks

-josh

> 
> What I am trying is:
> self.usrp_sink = uhd.usrp_sink(device_addr=self.addr, stream_args = 
> uhd.stream_args(cpu_format="32fc",channels=range(2),),)
> self.usrp_sink.set_clock_source("internal", 0)
> self.usrp_sink.set_time_source("mimo", 0)
> self.usrp_sink.set_clock_source("mimo", 1)
> self.usrp_sink.set_time_source("mimo", 1)
> 
> Am I right about that?
> Thanks for any help~
> 
> Robee
>                                         
> 
> 
> 
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