On Thu, Apr 15, 2010 at 16:52, Marcus D. Leech <mle...@ripnet.com> wrote:
> Can I use the GPIO stuff to give me better confidence of adequate > synchronization between the > actual data, and the state of the input? If you are willing to give up an LSB, you can turn on GPIO streaming with enable_gpio_streaming(). Then io_rx[15] will show up in the lsb of I, and io_rx[14] will show up in the lsb of Q. You need to use the usrp2.source_16sc source to get the raw samples, then gr_and_const to separate the digital bit from the rest of the sample. The io bits get stuffed as the samples come out of the DDC, so there is a fixed offset (you'll need to measure it) based on the group delay through the whole analog front-end and FPGA DDC. The delay is decimation dependent, but deterministic. Johnathan _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
