Hi everyone,
I am currently using two Ettus x440 devices. To develop my application
correctly I need to send and receive two signals between them (each device has
to implement one transmitter and one receiver). This signal exchange must occur
on different time. The thing is that, this time mismatching, must occur in
short times, in order of nanoseconds, so I need to control the "sender" and
"receiver" objects with high time resolutions. The code related to what I am
saying is the following one:
// in the receiver this is the command which controls the time where the
receiver is began to listen
*stream_cmd.time_spec = timeInit+uhd::time_spec_t(ATdma);*
// in the transmitter this is the command which controls the time where the
transmitter is began to send the signal buffered
*md.time_spec = timeInit+uhd::time_spec_t(ATdma);*
// with timeInit = usrp->uhd::get_time_now()+uhd::time_spec_t(0.25) & ATdma =
double(1e-7)
My questions here are the following:
1 - When ATdma is lower than tenths-hundreds of microseconds, the time
controlled by the previous lines are changed to zero, so there is no
displacement between simples. Does uhd::time_spec_t has no the enough
resolution to represent this kind of decimals? Or maybe is the hardware which
does not support this kind of resolutions?
2 - If it is a negative answer on 1st questions, maybe the problem could be
given by the data type (double)? I do not think that the problem could be given
by the data type, because this kind of data use floated point for the number
representation, but maybe I am wrong.
3 - If none of those question is the problem, could I use
"to_tick"/"from_tick" functions to achieve those resolutions? I tried to do
this, but I do not know how, if time_pect_t variable always set the time with a
integer part and a fractional part, and tick functions only gives integers,
right?
Thank you all for read/respond to my questions. I hope I would have explained
my self on a properly manner.
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