Add --fft-size command-line parameter, defaults to original behavior (1024)

git-svn-id: http://gnuradio.org/svn/gnuradio/trunk@9970 221aa14e-8319-0410-a670-987f0aec2ac5

diff --git a/gr-utils/src/python/usrp_fft.py b/gr-utils/src/python/usrp_fft.py
index 8a9008877da7c1ca31a0cd62be9e31c11f5d4888..3da62e29ee9794555a96656cc47e3f06db8de750 100755 (executable)
--- a/gr-utils/src/python/usrp_fft.py
+++ b/gr-utils/src/python/usrp_fft.py
@@ -77,6 +77,9 @@ class app_top_block(stdgui2.std_top_block):
                          help="Set fftsink averaging factor, default=[%default]")
        parser.add_option("", "--ref-scale", type="eng_float", default=13490.0,
                          help="Set dBFS=0dB input value, default=[%default]")
+        parser.add_option("", "--fft-size", type="int", default=1024,
+                          help="Set FFT frame size");
+
         (options, args) = parser.parse_args()
         if len(args) != 0:
             parser.print_help()
@@ -115,11 +118,11 @@ class app_top_block(stdgui2.std_top_block):
 
         if options.waterfall:
             self.scope = \
-              waterfallsink2.waterfall_sink_c (panel, fft_size=1024, sample_rate=input_rate)
+              waterfallsink2.waterfall_sink_c (panel, fft_size=options.fft_size, sample_rate=input_rate)
         elif options.oscilloscope:
             self.scope = scopesink2.scope_sink_c(panel, sample_rate=input_rate)
         else:
-            self.scope = fftsink2.fft_sink_c (panel, fft_size=1024, sample_rate=input_rate, 
+            self.scope = fftsink2.fft_sink_c (panel, fft_size=options.fft_size, sample_rate=input_rate, 
                                              ref_scale=options.ref_scale, ref_level=0.0, y_divs = 10,
                                              avg_alpha=options.avg_alpha)