Dear community,
I use an RFNoC block and I would like to use it in combination with the GPS time functionallity on a N310.
My aim is to create and write out a GPS precise timestamp - in the first step only once but maybe later more regularly.
Until Inow I have a RFNoC block, where I put the controlling stuff (of the main task) inside test1_block_ctrl_impl.cpp which is called by test1_impl.cc
My idea is to put the GPS time function inside test1_block_ctrl_impl.cpp / test1_impl.cc as well. In my opinion it is not necessary to create a completelty new self-written RFNoC block since it is a small function.
In the following I describe two different approaches how I try to achieve my goal, but I would like to use the easiest one.
Mainly I try to use the integrated GPSDO function
So if you know a better solution, don't hesitate to post it. :)
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(1)
Initially; I thought I could use code of the sync_to_gps.cpp in the examples folder of uhd, but I realized that therefore an instance of an usrp object is created.
uhd::usrp::multi_usrp::sptr usrp = uhd::usrp::multi_usrp::make(args);
Since I use a RFNoC block, previously a "rfnoc" object is constructed. (I dont know the exact name and where it is created). So, I have two instances which want to access at the same resource (board) at the same time. This is obviously not functioning.
So when I run it in gnuradio I got the following error:
[ERROR] [RPC] Someone tried to claim this device again
In order to avoid this problem I would like to apply the needed methods for using the GPS time functionallity at the rfnoc object (so I do not need to create an object usrp ).
In the sync_to_gps.cpp example the following methods are used:
set_clock_source
set_time_source
get_mboard_sensor_names
get_mboard_sensor
set_time_next_pps
get_time_last_pps
So my question is, where in the RFNoC framework is an instance of the rfnoc object created, so I can apply these methods to it.
Another thing:
If I start the built program sync_to_gps, I get after the initialization, a seg fault error. I think, it is because I use an RFNoC block.
Is it true, and where is the core dump stored?
(2)
During my research, I noticed that there is an RFNoC: Radio block. Looking at the source code I see interesting methods in it:
set_clock_source
set_time_next_pps
get_time_last_pps
but not (set_time_source, get_mboard_sensor_names, get_mboard_sensor )
So it seems to me that a GPS time function is not integrated in the rfnoc_radio_impl class.
This astonishes me, because I would assume that the RFNoC framework could perform at least the same tasks as an usual USRP (radio) one.
I think about using (copying) the missing methods in the rfnoc_radio_impl class. Are there any problems doing this or why they have not been implemented so far?
If I implement it, how can I recompile the block in order to get an updated RFNoC: Radio block.
If I implement it, how can I recompile the block in order to get an updated RFNoC: Radio block.
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Used software:
I use GNURadio 3.7.14.0, UHD 3.15 with Python 2.7.
Hardware:
N310
Thanks for the help :)
Kind regards
George
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