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From: | ematlis |
Subject: | Re: [Discuss-gnuradio] control time or number of points acquired |
Date: | Sat, 22 Dec 2007 20:04:13 -0500 (EST) |
Thanks Eric, Juha, and Michael-to get 3 helpful responses within an hour of sending a post is truly amazing, particularly considering the time of the year.
I should have elaborated in my post. I tried the gr.head approach, but I'm not sure it works in my application- I'm using the approach of the astronomy guys, with a control button that turns on and off from /dev/null to a file descriptor. So if I use gr.head, correct me if I'm wrong, but I believe it immediately sends the number of samples specified to /dev/null. I don't think that way is compatible with the approach I'm using, which I ripped off from usrp_psr_receiver.py.
So you know what I'm doing, I'm using the USRP as a pseudo digital oscilloscope with a capture to file option. When I see something I like in the scope, I hit the "capture to file" button. It works great, but currently I have to look at my watch to capture comparably sized samples.
Perhaps there's a way of incorporating a timed capture (or fixed number of samples to this model?
thanks again so much. eric ************************************ Eric H. Matlis, Ph.D. Aerospace & Mechanical Engineering Dept. 120 Hessert Center for Aerospace Research University of Notre Dame Notre Dame, IN 46556-5684 Phone: (574) 631-6054 Fax: (574) 631-8355 On Sat, 22 Dec 2007, Eric Blossom wrote:
On Sat, Dec 22, 2007 at 06:04:50PM -0500, address@hidden wrote:Hi all- has anybody implemented a control whereby the user can limit how long or how many points gets acquired by a gnuradio application? If so I'd appreciate any pointers! I've got an app where I'm storing samples to file and I'd like to control how many points go into each data file. thanks, ericHi Eric, We generally use gr.head for this. See gr-utils/src/python/usrp_rx_cfile.py Eric
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