Re: [Discuss-gnuradio] Front Panel GPIO on Ettus X310

[Maurizio Crozzoli]

Hi Martin or others who can support me,
I have a problem which is similar as Frank's: I have an E310 and I want to
receive a and external trigger on a pin which starts an acquisition process
of a burst of samples from the radio source.

Stated that I have to remove the box around the E310 to have access to the
GPIO ports (not a problem!), according to what I have read so far in this
thread, no way to reach my goal but using C++ (no GRC!). Not an easy task
for me but I do hope I can do it.

What I need you support about is related to the right approach I should
follow. I would think that I should write a "while" loop which runs in ARM
processors where one on the available GPIO port is constantly monitored:
when the trigger is detected the acquisition process of a burst of samples
from the radio source is started and, once it has been completed, the flow
goes back to the GPIO port monitoring.

Is there any example code I be inspired from? OF course I have to study what
can be found in the manual page "The E3x0/X3x0 Front Panel GPIO", but,
together with the suggested gpio.cpp example under UHD, it looks like there
is more emphasis on the ATR mechanism, which - I think - has nothing to do
with the problem I have to solve.

Martin or others, could you please comment on my problem?

TIA!

BR,
Maurizio.

PS If you think that, according to what I have understood so far, I will
need to use RFNoC in order to cope with the sampling speed constraints of
the acquisition process of a burst of samples from the radio source, you
might well understand how much I need your help, and not just for this
post...



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