On 04/01/2023 14:06, Pedro Pereira wrote:
If you're asking "can you make your ZCU102 code run on the N310?"
possibly. There's a dual-core ARM CPU running Linux, and
a large FPGA fabric.
Is there any documentation for doing this? My receiver is implemented
in c++, I think I would have to implement device drivers to read data
from the hardware to the software application.
I only found documentation for importing standard/custom hardware IP
blocks to gnuradio.
I'm still confused. You still want to use the ZCU102 hardware? What
role, then, would the N310 play? This is a use-case that
nobody at Ettus/NI has addressed, and, indeed, it's unlikely that
anyone on this list has tried to address this (confusing)
use case.
On Tue, 3 Jan 2023 at 16:36, Marcus D. Leech <patchvonbr...@gmail.com>
wrote:
On 03/01/2023 10:54, Pedro Pereira wrote:
Thanks for the response.
I don´t want to run the software component of the GNSS receiver
on my computer, while connected to the N310 for heterogeneous
processing - if that's what you're saying.
I want an edge device running embedded linux, like I already have
on my zcu102, to run both sw and hw components.
The first stages of the processing chain are in hardware so I
don´t want to read samples from the front-end at the application
level. I want to read samples directly from my hardware block
design, do some heavy processing and deliver the results to the
software application.
I can do all of this using AD front-ends and their HDL reference
designs. Is there any support to do this using N210 or N310?
Thanks again.
It's still not entirely clear what it is you're asking.
The N310 has a Zynq FPGA + 2 AD9371 radios + 2 SFP+ network ports.
This makes it somewhat similar to your ZCU102, but with radios
already built-in.
If you're asking "can you make your ZCU102 code run on the N310?"
possibly. There's a dual-core ARM CPU running Linux, and
a large FPGA fabric.
If you're asking "can I make my ZCU102 acquire samples from either
N310 or N210?" -- given that your ZCU102 has some SFP+
ports that could be configured for 1GiGe (or even 10GiGe in the
case of N310) -- it seems likely that you could port UHD to
the Linux ARM CPU on the ZCU102, and then you could talk to
either the N210 or N310 via the network ports from your ZCU102.
On Tue, 3 Jan 2023 at 15:15, Marcus Müller
<marcus.muel...@ettus.com> wrote:
Note that the N310's FPGA might actually be large enough to
fit in (parts of) a GNSS receiver, especially if you remove
the DUC chain of the TX path, in case you don't need that.
RFNoC is Ettus' framework for extending the FPGA
functionality, especially made for such use cases.
Note that even in RFNoC you get a stream of samples from the
radio frontend, which you basically paid NI/Ettus for to
design it for you, so that you don't have to worry about how
to talk to the physical hardware and can care about signal
processing :)
Cheers,
Marcus
On 03.01.23 16:11, Marcus Müller wrote:
Hi Mr Pereira,
the directest access you get to samples in the N210 is the
ethernet connection – and that has no downside for GNSS
applications, as the VITA49 samples fully represent the RF
signal, thanks to Shannon-Nyquist.
That is, of course, unless you start modifying the FPGA
image of the N210, and make it a completely different
product. It's kind of unlikely you want to do that.
Greetings,
Marcus
On 03.01.23 14:25, Pedro Pereira wrote:
Greetings,
I have 2 USRP front-ends - N210 and N310. I want to develop
a GNSS Receiver inside my FGPA - xilinx ZCU102 - and use
one of the USRP devices only as the front-end. The receiver
is quite large so I need an external board for all the
signal processing chain. The receiver has two
implementations - software-only & hybrid. In hybrid mode
some tasks of the processing chain are accelerated in hardware.
The software-only version of the receiver running on my
ZCU102 is able to configure the N210 and read packets over
ethernet correctly. However, with the hybrid version of the
receiver, I want to read the digital IQ samples from the
front end directly in hardware.
For example, I am able to do this with the ZCU102 connected
to FMComm2/3 using the FMC connection on the FPGA. AD
provides HDL reference designs to support communication
between multiple front-ends and multiple FPGAs.
Is there a similar way to read the digital samples directly
in hardware using the N210? The N210 only has the ethernet
and a MIMO port.
Thanks in advance.
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