Hello Ian,
I want a continuous TX of a generated signal, because I want to use the USB
exclusively for RX. I don't know if I can configure by UHD this option at first
time, without sending data all time and modifying the input TX data of the
b205_io block with my desired signal. Is this option of configuration possible?
I think that with that option I could accomplish the 3 tips that you wrote.
Thanks for your answer.
Regards,
Diego
De: Ian Buckley
Enviado el: Wednesday, March 27, 2019 4:50 AM
Para: Justo Ramos, Diego
CC: usrp-users
Asunto: Re: [USRP-users] Standalone signal generator on B205mini
I can’t give you a specific solution Diego because there are a lot of things
here that *could* be the issue.
However in general my tips for hacking fast custom B2xx FPGA images are:
1) Do it in such a way that UHD can not tell you changed the FPGA.
i.e All register transactions should work as expected from the perspective of
UHD (Understand though it doesn’t “know” if the transaction did what it
expected, only that it got an acknowledgement)
If you want to transmit then still send a sample stream to the USRP even if you
discard it after it is acknowledged by the USRP (It can be a much lower sample
rate than your custom logic outputs, you control radio_clk directly with
master_clock_rate, sample rate controls the interpolation ratio down from
radio_clk)
2) Use the driver functionality of UHD to control all the H/W. Really you don’t
want to debug driver style code if you are in a hurry, especially the
transceiver.
3) Don't touch the logic that interfaces immediately to the FPGA pins so as too
preserve off-chip timing…a lot of work went into qualifying that.
-Ian
On Mar 26, 2019, at 10:07 AM, Justo Ramos, Diego via USRP-users
mailto:usrp-users@lists.ettus.com>> wrote:
Hello all,
I have an B205mini board and I'm interested in modifying the internal TX block
of the FPGA, to be an standalone signal generator.
I created a custom block that generates a signal, in this case a pulse
generator, with the two components of 12 bits for I and Q. Then I connect these
two components into b205_io's tx_i0 y rx_i0. I use the radio_clk as clock to
generate samples of the signal.
Finally I remake the binary files of the FPGA and I reprogram the B205mini, but
when I use the Spectrum Analyzer I don't have any signal on the TX frequency.
I don't know if I have to change the clock for generation of samples or
activate another signal. Could someone give me an advice to achieve custom
transmission from the FPGA?
Thanks you.
Best regards,
Diego
Este correo electrónico y, en su caso, cualquier fichero anexo al mismo,
contiene información de carácter confidencial exclusivamente dirigida a su
destinatario o destinatarios. Si no es vd. el destinatario indicado, queda
notificado que la lectura, utilización, divulgación y/o copia sin autorización
está prohibida en virtud de la legislación vigente. En el caso de haber
recibido este correo electrónico por error, se ruega notificar inmediatamente
esta circunstancia mediante reenvío a la dirección electrónica del remitente.
Evite imprimir este mensaje si no es estrictamente necesario.
This email and any file attached to it (when applicable) contain(s)
confidential information that is exclusively addressed to its recipient(s). If
you are not the indicated recipient, you are informed that reading, using,
disseminating and/or copying it without authorisation is forbidden in
accordance with the legislation in effect. If you have received this email by
mistake, please immediately notify the sender of the situation by resending it
to their email address.
Avoid printing this message if it is not absolutely necessary.
___
USRP-users mailing list
USRP-users@lists.ettus.com<mailto:USRP-users@lists.ettus.com>
http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
Este correo electrónico y, en su caso, cualquier fichero anexo al mismo,
contiene información de carácter confidencial exclusivamente dirigida a su
destinatario o destinatarios. Si no es vd. el destinatario indicado, queda
notificado que la lectura, utilización, divulgación y/o copia sin autorización
está prohibida en virtud de la legislación vigente. En el caso de haber
recibido este correo electrónico por error, se ruega notificar inmediatamente
esta circunstancia mediante reenvío a la dirección electrónica del remitente.
Evite imprimir este mensaje si no es estrictamente necesario.
This email and any file attached to it (when applicable) contain(s)
confidential information that is exclusively addressed to its recipient(s). If
you are not the indicated recipient, you are informed that reading, using,
disseminating and/or copying it without authorisation is forbidden in
accordance with the legislation in effect. If you have received this email by
mis
