Hi James,
Actually, the commit was only a month ago, I checked my source code and it
is different from the revised version. So just to make sure, what I need to
do is to change the source files (usrp_source_impl.cc, usrp_source.h etc),
then
mkdir build (under gnuradio/)
cd build
cmake ..
make
make test
sudo make install
Then the lib files will be overwritten? Or do I need to delete something
before doing so?
Thanks,
Zhihong
On Wed, Feb 10, 2016 at 7:43 PM, James Humphries <[email protected]>
wrote:
> Hi Zhihong,
>
> 4ae7a6015ba719a4720f61cc6f3857de2ebda89f is the commit hash that refers to
> a specific commit on the GNU Radio repository.
>
> If you built GNU Radio recently (I believe this commit was last August),
> then you should be OK.
>
> -Trip
>
> On Wed, Feb 10, 2016 at 6:42 PM, Zhihong Luo <[email protected]> wrote:
>
>> Hi Martin,
>>
>> What I want to do is to use the stream command to receive data, put it
>> into the file, rest for like 2s, then start receiving again. I think I can
>> do this by using multiple NUM SAMPLE AND DONE commands?
>>
>> I don"t really understand the stop() here, I am using it because the
>> manual seems to say so? Previously, I simply called the issue-stream-cmd
>> function before the flow graph start, but the file grew large very rapidly,
>> so I was thinking maybe the stop() is the right way to do it. Now I have no
>> idea how to call it.
>>
>> Sorry, but what is 4ae7a6015ba719a4720f61cc6f3857de2ebda89f ?
>>
>> Thanks a lot,
>> Zhihong
>> 2016年2月10日星期三，Martin Braun <[email protected]> 写道：
>>
>>> Which version are you running? 4ae7a6015ba719a4720f61cc6f3857de2ebda89f
>>> should fix this issue.
>>>
>>> Also, is this really what you want to happen? If you just call
>>> issue_stream_cmd() with a STOP command, it will stop, but all the data
>>> will still flow through the graph, instead of getting flushed.
>>> Especially as you are stopping and starting the flow graph.
>>>
>>> My guess is you don't really need stop() here.
>>>
>>> Cheers,
>>> M
>>>
>>>
>>> On 02/10/2016 03:07 PM, Zhihong Luo wrote:
>>> > Hi All,
>>> >
>>> > In the manual, it says to use issue_stream_cmd:
>>> >
>>> > After starting the flow graph, the user should call stop()
>>> > <
>>> https://gnuradio.org/doc/doxygen/classgr_1_1block.html#a0863bc16f7c84adf4cddf5d53124450e
>>> >on
>>> > this block, then issue any desired arbitrary stream_cmd_t structs to
>>> the
>>> > device
>>> >
>>> > Therefore, I tried to stop() then issue the stream command, but it ran
>>> > into segmentation fault. My code is:
>>> >
>>> > uhd::stream_cmd_t
>>> > stream_cmd(uhd::stream_cmd_t::STREAM_MODE_NUM_SAMPS_AND_DONE);
>>> > size_t num_requested_samples= 10000;
>>> > stream_cmd.num_samps = size_t(num_requested_samples);
>>> > stream_cmd.stream_now = true;
>>> > stream_cmd.time_spec = uhd::time_spec_t();
>>> > ...
>>> > std::cout << "starting flow graph" << std::endl;
>>> > tb->start();
>>> > usrp_source->stop();
>>> > usrp_source->issue_stream_cmd (stream_cmd);
>>> >
>>> > Even if I delete the issue_stream_cmd line, there is still a
>>> > segmentation fault. Can someone point out where I made a mistake?
>>> Thanks.
>>> >
>>> > Zhihong Luo
>>> >
>>> >
>>> > _______________________________________________
>>> > Discuss-gnuradio mailing list
>>> > [email protected]
>>> > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>>> >
>>>
>>>
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>>
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