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 > <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 > <http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com>
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