[Discuss-gnuradio] block buffer sizes

2006-11-14 Thread scaperot
Hi all, is there an easy way to know how big each buffer is in each of the blocks in a flow graph, for example: src = usrp.sink_c() amp = gr.multiply_const_cc(...) dst = gr.message_sink_c(...) fg.connect(src, amp, dst) fg.start() #and then check to see how big the buffers were that the sched

[Discuss-gnuradio] Re: USRP push-to-talk?

2006-11-13 Thread scaperot
all, I am interested in controlling the USRP to do a half duplex operation: (when I say transmit, stop receiving, and when I say receive, stop transmit). I have been reading about the output enable registers, and in a previous discussion, you suggested doing something like: u_rx = usrp.source_c(

[Discuss-gnuradio] data types and other questions

2006-10-31 Thread scaperot
Hello all, I've been using GNU Radio and the USRP for about a year now, and until now I took for granted some of the things that are going on under the hood, if you know what I mean. For example, recently, I noticed that the gr_complex data type is simply the complex float data type in C++ (I w

Re: [Discuss-gnuradio] TDMA question

2006-10-19 Thread scaperot
> > Yes, the m-block stuff will provide a reasonable interface for doing > this. Besides m-blocks, this also requires considerable work in the > USRP FPGA to make it happen. > > The basic idea is that received packets will have time stamps in them > that correspond to the arrival time that the fir

[Discuss-gnuradio] reconfiguration latency

2006-09-22 Thread scaperot
Hey all, I am playing with reconfiguring the USRP while its running and I was trying to figure out some kind of benchmark time (on the order of...?) that it might take to reconfigure different settings for the USRP. (1) frequency (2) interpolation / decimation (3) mux (4) etc. I know that when y

[Discuss-gnuradio] TDMA question

2006-09-18 Thread scaperot
I couldn't help but notice that there was a mention of TDMA on the Wiki: "Precision time stamping and synchronization for TDMA waveforms" is this time stamp referring to a method of the tun/tap driver in tunnel.py? or is there another example that shows how to do that?? I am not very experience

Re: [Discuss-gnuradio] Trouble understanding multiple independent signals

2006-09-18 Thread scaperot
Hi all, I have been playing around with the fm_tx_2_daughterboards.py and others to send multiple signals at once. I just wanted to confirm my suspicions about the USB transmit path because I didn't see anyone explicitly talking about this: When I look in the usrp1.py and usrp.py files that onl