On Sat, Jan 16, 2010 at 2:09 PM, Matt Ettus <m...@ettus.com> wrote: > What daughterboards are you using? If it is the BasicRX or LFRX and BasicTX > or LFTX, the you are probably better off doing this all in the same USRP2. > It would take some relatively small modifications to the FPGA. >
We are using an LFRx and an LFTx. We would absolutely love to have a version of the USRP2 firmware and host software that can read both receiver channels, as we can on the USRP1. I've been trying for weeks (as a low-priority task when I have nothing else to do) to create a "usrp2_dual_source" block as a first step before modifying the firmware to read from either channel on the USRP2, but I haven't been able to actually get it to work at all, even as a dummy procedure, on the host side (I am going to post a separate question about this to the discussion group after I finish this message - there is some stuff about this development environment that is baffling me). I think what we really want to do is implement our algorithm as a standalone program on the SD card, but I thought that using data from both receiver channels on the host would be a logical intermediate step. Basically when I say it "blows up" it's a race condition, where our host processing is unable to calculate the proper correction signal - it seems clear to us (just from the way the system behaves) that when RX is ON, our correction signal is getting delayed enough that by the time our external hardware gets it it's no longer useful - it's more important to us that our output be transmitted asap even if it means dropping some of it. Here's the output of the serial port when the system is working properly: Tx dbid: 0xE Rx dbid: 0xF TxRx-NEWETH 00:50:C2:85:34:01 ethernet flow control: NONE Speed set to 1000 eth link changed: speed = 1000 Tx dbid: 0xE Rx dbid: 0xF UUUUUEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEUUEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEUUEEEEEEEEEEEEEEEEEEEEEEEEEEEEE _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
