Re: [Discuss-gnuradio] Piping to the USRP - mkfifo issue

2011-07-01 Thread Marcus D. Leech
That's what it should do. But in practice, I've seen some blocks locking if their writes were blocked. That's why I suggested starting in this order. The other issue is that if you have multiple FIFOs, then the only *reliable* mechanism for making it work is to have the *reader* open non-b

Re: [Discuss-gnuradio] Piping to the USRP - mkfifo issue

2011-07-01 Thread Charles Alberton Herdt
On Fri, Jul 1, 2011 at 14:51, Marcus D. Leech wrote: > ** > > Sorry for replying so late. > > I've been using pipes with file sources and sinks. > One trick you have to do is start the consumer before the producer. For > some reason if the writing on the pipes starts before the reading, things

Re: [Discuss-gnuradio] Piping to the USRP - mkfifo issue

2011-07-01 Thread Marcus D. Leech
Sorry for replying so late. I've been using pipes with file sources and sinks. One trick you have to do is start the consumer before the producer. For some reason if the writing on the pipes starts before the reading, things get messed up. Try starting the transmitter reading the pipe befor

Re: [Discuss-gnuradio] Piping to the USRP - mkfifo issue

2011-07-01 Thread Charles Alberton Herdt
Sorry for replying so late. I've been using pipes with file sources and sinks. One trick you have to do is start the consumer before the producer. For some reason if the writing on the pipes starts before the reading, things get messed up. Try starting the transmitter reading the pipe before y

Re: [Discuss-gnuradio] Piping to the USRP - mkfifo issue

2011-03-07 Thread Marcus D. Leech
On Mon, Mar 7, 2011 at 2:45 AM, Tom Hendrick > wrote: Thanks Tom, I'm a beginner still with linux/GNURadio so I couldn't really find any information that makes sense as to how gr-atsc handles the fifo piping. I had seen an example online of someone

Re: [Discuss-gnuradio] Piping to the USRP - mkfifo issue

2011-03-07 Thread Alexandru Csete
On Mon, Mar 7, 2011 at 2:45 AM, Tom Hendrick wrote: > Thanks Tom, > > I'm a beginner still with linux/GNURadio so I couldn't really find any > information that makes sense as to how gr-atsc handles the fifo piping. > > I had seen an example online of someone that had done a transmission using > t

Re: [Discuss-gnuradio] Piping to the USRP - mkfifo issue

2011-03-06 Thread Tom Hendrick
gstreamer using mkfifo like I had tried but I can't get any output on the USRP when I read from the file created by mkfifo. http://wiki.oz9aec.net/index.php/Simple_DVB_with_Gstreamer_and_GNU_Radio -Tom --- On Mon, 3/7/11, Tom Rondeau wrote: From: Tom Rondeau Subject: Re: [Discuss-gnur

Re: [Discuss-gnuradio] Piping to the USRP - mkfifo issue

2011-03-06 Thread Tom Rondeau
On Sun, Mar 6, 2011 at 6:59 PM, Tom Hendrick wrote: > Hi > > I am using a web camera to get an MPEG-4 rtsp stream that is set to a > constant bitrate. I have a script which pipes the rtsp stream to a code in > C++. The C++ code modulates the signal and writes a .WAV file to the hard > disk.

[Discuss-gnuradio] Piping to the USRP - mkfifo issue

2011-03-06 Thread Tom Hendrick
Hi   I am using a web camera to get an MPEG-4 rtsp stream that is set to a constant bitrate.  I have a script which pipes the rtsp stream to a code in C++.  The C++ code modulates the signal and writes  a .WAV file to the hard disk. I have a python script which interfaces with GNURadio/USRP