Re: [Discuss-gnuradio] set_command_time ack timeout issue

[Steve Zygmunt]

Ah ok, it is a misunderstanding of mine of how the set_command_time() works 
then.  I was under the impression that the command will still return 
immediately but instead, any command given after the set_command_time will then 
hang until the ACK is passed back after the command executes.  Will have to 
experiment some more to find a solution that works.  Thanks for the info.

On Sep 4, 2013, at 2:48 AM, Marcus Müller <address@hidden> wrote:

> Hi Steve,
> 
>> Worth it to submit an additional bug noting the fifo timeout for longer 
>> set_command_time()?  I think that it > is merely an additional symptom of 
>> the issue you found.
> 
> No, actually I think your timeout after set_command_time is not /really/ a 
> bug, actually.
> The gr-uhd usrp_source uses uhd::multi_usrp, which your case uses 
> uhd/host/lib/usrp/usrp2/usrp2_fifo_ctrl.cpp that has set_time, which gets 
> called whenever you issue a timed command. This sets your UHD timeout to 
> MASSIVE_TIMEOUT (same file, == 10s), so that wait_for_ack (same file) throws 
> your runtime error.
> 
> So, basically, unless you don't modify your uhd sources, the wisest solution 
> to your problem seems to be not letting something happen more than 10s in the 
> future.
> 
> Hope that helped,
> Marcus Müller
> On 09/04/2013 02:59 AM, Steve Zygmunt wrote:
>> could you try if http://gnuradio.org/redmine/issues/584 applies to you as 
>> well? Thanks, Marcus Müller
>>>> I was wondering if anyone could give some insight into how the 
>>>> set_command_time() command handles the ack.  I am having an issue where 
>>>> the system/thread locks waiting for an ACK from a set_center_freq() or if 
>>>> the set_command_time is far enough in the future then the fifo ctrl times 
>>>> out with:
>>>> 
>>>>   File 
>>>> "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/gnuradio/uhd/uhd_swig.py",
>>>>  line 2827, in set_center_freq
>>>>     return _uhd_swig.usrp_source_sptr_set_center_freq(self, *args)
>>>> RuntimeError: RuntimeError: fifo ctrl timed out looking for acks
>>>> 
>>>> The end goal I am trying to achieve is to tune at a specific time.  The 
>>>> only other approach to solve that I can see is to add a tune flag to the 
>>>> stream and modify the gr-uhd and uhd software to handle appropriately, 
>>>> which I would rather not open that can of worms if I don't have to.  Any 
>>>> advice would be greatly appreciated.
>>>> 
>>>> 
>>>> System:
>>>> Mac Laptop with 10.8 with USRP N210
>>>> Macports gnuradio-devel @3.7.1_20130821
>>>> Macports uhd @003_005_003