Hi Fabien!
Sadly, as said, the AUX ADC and DAC are asynchronous, by design. You can't make them
synchronous without developing a different streaming architecture for the N210; that would
be a major change to the FPGA design, I'd presume, not just a little change :(
The thing I could imagine
The problem is that the latency using a sound card is terrible, even using
jackd. Using N210's sink ans source for audio purposes give very good latencies
but it limites me to half-duplex.
This is for what I'm interested by using that ADC and DAC.
Marcus D. Leech a écrit
>On
On 2022-03-05 14:16, Fabien PELLET wrote:
Hi Marcus,
Thanks for the detailed answer. I already know get_rx_dboard_iface
method as it is it that I use to access the IO of LFRX and LFTX.
The problem is that this is asynchrous. For my need, I would like to
feed it synchronously at a defined
Hi Marcus,
Thanks for the detailed answer. I already know get_rx_dboard_iface method as it
is it that I use to access the IO of LFRX and LFTX.
The problem is that this is asynchrous. For my need, I would like to feed it
synchronously at a defined sample rate for audio purpose for example.
Do
Just realized that there *is* a C++ API:
usrp_block->get_device()->get_rx_dboard_iface()->read_aux_adc();
replace _rx_ with _tx_ for the LFTX, and read_aux_adc with write_aux_dac for
the DAC.
Best regards,
Marcus
DISCLAIMER: Any attached Code is provided As Is. It has not been tested or
Hi Fabien,
no need to modify the FPGA. The functionality is there – it's just not exposed to the
user. Also, note that interacting with the auxiliary ADC and DAC is going to be
asynchronous to the sample flow – there might be millions of samples from the main ADC
that have flown by before an
See here for the schematics which will help you find the full specs for the AUX
ADC and DAC.
https://files.ettus.com/schematics/n200/
Yes you can certainly modify the FPGA and UHD to support these. But you’ll
mostly be on your own.
Sent from my iPhone
> On Mar 4, 2022, at 9:35 AM, Fabien
Yes, sorry indeed I was talking about AUX_DAC and AUX_ADC that are
replicated from the motherboard.
I already use IO which works very well. So there is no way to send
samples (or receive) at a specific sample rate using that AUX_DAC or
ADC. It is just some "analog IOs" for reading some
Sorry, hit "send" accidentally:
Dear Fabien,
there's no ADC on these daughterboards. Just an EEPROM for identification, opamps for
amplification and signal conditioning, and on the LFTX a switch-mode power supply. You're
right, they do exppose the AUX DACs and ADC lines from the motherboad.
Dear Fabien,
there's no ADC on these daughterboards. Just an EEPROM for identification, opamps for
amplification and signal conditioning, and on the LFTX a switch-mode power supply.
Best regards,
Marcus
On 04.03.22 10:30, Fabien PELLET wrote:
Hello,
As there are IOs available on LFTX and
Hello,
As there are IOs available on LFTX and LFRX, there are also ADC and DAC
available.
Is there a way to use them as SOURCE and SINK in gnuradio for low speed
conversion ?
Thanks,
Best regards,
Fabien, F4CTZ.
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