Re: [Discuss-gnuradio] uint64_t to PMT in Python

[Lakshay Narula]

Hi Marcus, 

Yes, from_long() did actually work fine with the hardware.

However, I think I am facing a more general problem with Python binding of GNU Radio. For example, the uhd.usrp_sink.get_full_secs() function returns a variable of data type time_t. Once again, this is not recognized in Python. I am wondering if this is a limitation of using Python for writing blocks, or is there a way around such data type mismatch issues? (For this particular case, I was able to use uhd.usrp_sink.get_real_secs() and discard the fractional part).

I am guessing there might be something I could change in the SWIG file, but I have not found an answer yet.

Thanks,

Lakshay.

On Sun, Aug 14, 2016 at 2:24 PM, Marcus Müller <address@hidden> wrote:

Hi Lakshay,

haven't tried that in a while; but wouldn't from_long() work?


Best regards,
Marcus

On 12.08.2016 16:26, Lakshay Narula wrote:
> Hello,
>
> I am trying to use the "tx_time" tag in my Python OOT block. The value
> for this tag is a tuple of PMTs: integer seconds in PMT format derived
> from uint64_t, and fractional seconds in PMT format derived from double.
>
> These data type conversions work well in C++. But in Python there are
> no built-in unsigned integer data types. So I tried using
> numpy.uint64, but the Python function pmt.from_uint64 shows up an
> error saying that the argument must be of type uint64_t.
>
> As a work around, I used long instead of numpy.uint64, and
> subsequently used pmt.from_long to pass the integer seconds. I have
> not tried if it works, but even if it does it is a bit of a hack.
>
> Is there a cleaner way to generate the "tx_time" value tuple in Python?
>
> Thanks,
> Lakshay.
>
>

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