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-rwxr-xr-xgsm-tvoid/src/python/gsm_scan.py99
1 files changed, 46 insertions, 53 deletions
diff --git a/gsm-tvoid/src/python/gsm_scan.py b/gsm-tvoid/src/python/gsm_scan.py
index 9d5cbcf..6e09f7f 100755
--- a/gsm-tvoid/src/python/gsm_scan.py
+++ b/gsm-tvoid/src/python/gsm_scan.py
@@ -31,19 +31,37 @@ class burst_callback(gr.feval_ll):
def __init__(self, fg):
gr.feval_ll.__init__(self)
self.fg = fg
-
+ self.offset_mean_num = 30 #number of FCCH offsets to average
+ self.offset_vals = []
+
def eval(self, x):
try:
- #print "burst_callback: ", x, "\n";
- if gsm.BURST_CB_ADJ_OFFSET == x:
- #return 0
- #TODO: rework so this will work on file input
+ #TODO: rework so this will work on file input
+ if gsm.BURST_CB_SYNC_OFFSET == x:
+ last_offset = self.fg.burst.last_freq_offset()
+ self.fg.offset -= last_offset
+ print "burst_callback: SYNC_OFFSET:", last_offset, " ARFCN: ", self.fg.arfcn, "\n";
+ self.fg.set_channel(self.fg.arfcn)
+
+ elif gsm.BURST_CB_ADJ_OFFSET == x:
last_offset = self.fg.burst.last_freq_offset()
- if 20000.0 > abs(last_offset) > 500.0:
- self.fg.offset -= last_offset
- print "burst_callback: ADJ_OFFSET:", last_offset, " ARFCN: ", self.fg.arfcn, "\n";
- self.fg.set_channel(self.fg.arfcn)
+ #print "burst_callback: ADJ_OFFSET:", last_offset, " ARFCN: ", self.fg.arfcn, "\n";
+ self.offset_vals.append(last_offset)
+
+ if len(self.offset_vals) >= self.offset_mean_num:
+ sum = 0.0
+ while len(self.offset_vals):
+ sum += self.offset_vals.pop(0)
+
+ mean_offset = sum / self.offset_mean_num
+ self.fg.offset -= mean_offset
+
+ #retune if greater than 100 Hz
+ if mean_offset > 100.0:
+ print "burst_callback: mean offset:", mean_offset, "\n";
+ self.fg.set_channel(self.fg.arfcn)
+
elif gsm.BURST_CB_TUNE == x:
print "burst_callback: BURST_CB_TUNE: ARFCN: ", self.fg.burst.next_arfcn, "\n";
self.fg.set_channel(self.fg.burst.next_arfcn)
@@ -196,25 +214,25 @@ class app_flow_graph(stdgui.gui_flow_graph):
sps = input_rate/gsm_symb_rate
- # Attempt to enable realtime scheduling
- r = gr.enable_realtime_scheduling()
- if r == gr.RT_OK:
- realtime = True
- print "Realtime scheduling ENABLED"
- else:
- realtime = False
- print "Realtime scheduling FAILED"
-
-# if options.fusb_block_size == 0 and options.fusb_nblocks == 0:
- if realtime: # be more aggressive
- options.fusb_block_size = gr.prefs().get_long('fusb', 'rt_block_size', 1024)
- options.fusb_nblocks = gr.prefs().get_long('fusb', 'rt_nblocks', 16)
- else:
- options.fusb_block_size = gr.prefs().get_long('fusb', 'block_size', 4096)
- options.fusb_nblocks = gr.prefs().get_long('fusb', 'nblocks', 16)
-
- print "fusb_block_size =", options.fusb_block_size
- print "fusb_nblocks =", options.fusb_nblocks
+# # Attempt to enable realtime scheduling
+# r = gr.enable_realtime_scheduling()
+# if r == gr.RT_OK:
+# realtime = True
+# print "Realtime scheduling ENABLED"
+# else:
+# realtime = False
+# print "Realtime scheduling FAILED"
+#
+# # if options.fusb_block_size == 0 and options.fusb_nblocks == 0:
+# if realtime: # be more aggressive
+# options.fusb_block_size = gr.prefs().get_long('fusb', 'rt_block_size', 1024)
+# options.fusb_nblocks = gr.prefs().get_long('fusb', 'rt_nblocks', 16)
+# else:
+# options.fusb_block_size = gr.prefs().get_long('fusb', 'block_size', 4096)
+# options.fusb_nblocks = gr.prefs().get_long('fusb', 'nblocks', 16)
+#
+# print "fusb_block_size =", options.fusb_block_size
+# print "fusb_nblocks =", options.fusb_nblocks
# Build the flowgraph
# Setup our input source
@@ -302,31 +320,6 @@ class app_flow_graph(stdgui.gui_flow_graph):
self.clocked_scope = scopesink.scope_sink_f(self, panel, sample_rate=gsm_symb_rate,v_scale=1)
self.connect(self.clocker, self.clocked_scope)
- elif options.decoder.count("F"):
- #configure clock recovery
- gain_mu = 0.01
- gain_omega = .25 * gain_mu * gain_mu # critically damped
- self.clocker = gr.clock_recovery_mm_cc( sps,
- gain_omega,
- 0.5, #mu
- gain_mu,
- 0.3) #omega_relative_limit,
-
-
- # configure demodulator
- self.demod = gr.quadrature_demod_cf(1);
-
- self.burst = gsm.burst_ff()
- self.connect(self.filter, self.clocker, self.demod, self.burst)
-
- if self.scopes.count("d"):
- self.demod_scope = scopesink.scope_sink_f(self, panel, sample_rate=input_rate)
- self.connect(self.demod, self.demod_scope)
-
- if self.scopes.count("c"):
- self.clocked_scope = scopesink.scope_sink_f(self, panel, sample_rate=gsm_symb_rate,v_scale=1)
- self.connect(self.clocker, self.clocked_scope)
-
# setup decoder parameters
# equalizer
personal git repositories of Harald Welte. Your mileage may vary