Hi all,
I just installed the file again, and this time the file can be generated
with no errors. I must have did something wrong last time I installed it.
And there is no segmentation fault. Thank you for previous help.
But when I used it, if I set "issue_stream_cmd_on_start" as false as
follow, even if I issue stream command after the flow graph starts, the
file of the file sink is still empty.
gr::uhd::usrp_source::sptr usrp_source =
gr::uhd::usrp_source::make(device_addr, uhd::stream_args_t("fc32"),false);
tb->start();
usrp_source->issue_stream_cmd (stream_cmd); (mode is NUM_SAMPLES_AND_DONE)
I expect the file to have some small amount of data, but no matter how
larger the sample number I set, it was still empty.
Another issue is that if I set it to issue stream command on start
("issue_stream_cmd_on_start" = true), even if I call usrp_source->stop(),
the file still keeps growing larger.
I am confused by these two issues, thanks in advance for anyone pointing
out the problem.
On Thu, Feb 11, 2016 at 1:21 AM, Zhihong Luo <[email protected]> wrote:
> For more information, the line that causes error is:
>
> gr::uhd::usrp_source::sptr usrp_source =
> gr::uhd::usrp_source::make(device_addr, uhd::stream_args_t("fc32"));
>
> And if I delete the usrp_source::make line, there will be no error. But
> even if I change it into the old style of make, the same error output
> occurs. Therefore, the problem is about the new make function, which I used
> from Revision 338cfae6. I just copied and pasted the three files of the
> revision, then make and make install.
>
> Thanks,
> Zhihong
>
> On Wed, Feb 10, 2016 at 10:21 PM, Zhihong Luo <[email protected]> wrote:
>
>> Hi James,
>>
>> I modified the code, uninstalled then make and install again. But when I
>> tried to generate the C API file (which can be generated before I did all
>> these), it outputs errors:
>>
>> CMakeFiles/tags.dir/tags.cc.o: In function `_main(int, char**)':
>> tags.cc:(.text+0x892): undefined reference to
>> `gr::uhd::usrp_source::make(uhd::device_addr_t const&, uhd::stream_args_t
>> const&, bool)'
>> collect2: error: ld returned 1 exit status
>> make[2]: *** [apps/tags] Error 1
>> make[1]: *** [apps/CMakeFiles/tags.dir/all] Error 2
>> make: *** [all] Error 2
>>
>> It has errors on usrp_source, which I just modified the code of. I
>> checked the source files, they are the same as Revision 338cfae6. So where
>> can my mistakes be? Thanks in advance.
>>
>> Zhihong
>>
>> On Wed, Feb 10, 2016 at 8:38 PM, James Humphries <
>> [email protected]> wrote:
>>
>>> You can uninstall in the build directory:
>>>
>>> sudo make uninstall
>>>
>>>
>>>
>>> On Wed, Feb 10, 2016 at 8:33 PM, Zhihong Luo <[email protected]> wrote:
>>>
>>>> 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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>>>>>>>
>>>>>>
>>>>>> _______________________________________________
>>>>>> Discuss-gnuradio mailing list
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>>>>>>
>>>>>>
>>>>>
>>>>
>>>
>>
>
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