On your first question, see https://github.com/gnuradio/gnuradio/pull/6024.
On Wed, Aug 3, 2022 at 3:52 PM DİREN ERDEM AYDIN via GNU Radio, the Free & Open-Source Toolkit for Software Radio <discuss-gnuradio@gnu.org> wrote: > Dear All, > > I am using Adalm Pluto SDR with GNU Radio for a time and working on a > transmission of a sin gaussian wavelet. The used flowgraph is given in the > attachments. > > First, I want to ask the scaling parameters of data conversion blocks that > are used with IIO Device Sink and Source; Float To Short block is ok and it > is used to get full-scale representation as the given signal has 1 V > peak, we multiply it with 2^15. However, I didn't get the math behind short > to float block; the scale has to be 2.048k (which is 2^15/2^11) to get the > same amplitude level that I have received with standard PlutoSDR Source. > 32768 can be represented in single precision floating point format so why > we are dividing it? > > About cyclic behaviour; the transmitted signal has 6144 samples, TX and RX > buffers are set as 614400 which equals to 100 signals in each turn but > after receiving about 900-1000 signals GNU radio gives "Unable to push > buffer: Resource device" error and stop transmitting. Does anyone has an > idea that what can be the cause of this problem? Cyclic_ON_614K_43 > screenshot is the received waveform which includes many sine_gaussian. > To handle the problem I have turned off the cyclic mode, the error is gone > but now the received signal count is unpredictable. As far as I know cyclic > mode off means that sending a signal only once. In this case, it sends > multiple times ie. between 110 to 400. Therefore, I may say that buffers > are filled more than once. At this point, I think that something is not > correct in cyclic-off case too. > > Will appreciate any help, > Regards, > Diren >
