|
From: | Larry Wagner |
Subject: | Re: [Discuss-gnuradio] reconfigure flow graph with scope app |
Date: | Mon, 26 Jan 2009 22:21:09 -0800 |
Hi Eric -Thank you for your reply. I incorrectly used the wording offset between the 2 daughter cards where I meant to say that the absolute offset (of the 2 daughter cards) is unknown at the start of a run. This has been observed after many experiments so far with my interferometer like project and causes a run to run inconsistency.
I have worked out a calibration procedure where I begin with a known geometry (transmitter to receiver placement) and observe the scope; and then reconfigure the flow graph by a keypress without stopping the app. This will be accomplished by use of "app.set_volume()" in the main program and a "def set_volume(self, volume):" in the flow graph that includes the scope as a sink.
The modifications to the main part of multi_scope.py that I have tried are below. When I run this I get a scope but do not get the prompt in the terminal window. When I click on the close window of the scope window I do get the prompt.
def main (): app = stdgui2.stdapp (test_top_block, "O'Scope Test App") app.MainLoop () raw_input ('Press Enter to end CALIBRATE and start RUN (amplify x now):') raw_input ('Press Enter to stop: ') app.stop() if __name__ == '__main__': main () # ---------------------------------------------------------------- Take care, - Larry At 03:40 PM 1/26/2009, Eric Blossom wrote:
On Sun, Jan 25, 2009 at 11:34:34PM -0800, Larry Wagner wrote: > Hi - > > I have a USRP with 2 RFX2400 daughter cards and need to calibrate the > local oscillator (LO) offset between them. To do this I want to modify > the multi_scope.py example to allow me to reconfigure the flow graph > without stopping. This is based on some external measurement I will do > followed by a keypress and possibly an input using raw_input(). Larry, If the 2 RFX2400 cards are attached to the same USRP, there will be no LO offset between them. They are driven by a common ref clock provided by the USRP motherboard. Eric
[Prev in Thread] | Current Thread | [Next in Thread] |