Changeset 505

Timestamp:

10/28/09 10:26:34 (15 years ago)

Author:

sriram

Message:

Few changes for measuring no packet time

Files:

• vtcross/trunk/src/cross-examples/python/gnuradio-examples/benchmark_dsa.py (modified) (7 diffs)

vtcross/trunk/src/cross-examples/python/gnuradio-examples/benchmark_dsa.py

@@ -44 +44 @@
 
 global sync_status,mode,ch,traffic_flag,n_rcvd, n_right
+global ticker_start,time_right_now #measuring duration over which no packet is sent
+ticker_start = datetime.now()
+#no_packet_stop_time = False
+global no_packet_period #allowed duration for no packet
+no_packet_period = 3
 sync_status = False
 
@@ -69 +74 @@
     global n_right, sync_status, mode, ch, traffic_flag
     global n_attempts, return_flag, crossShellHost, crossShellPort
-
+    global ticker_start,time_right_now,no_packet_period
+
+   
     n_rcvd = 0
     n_right = 0
@@ -168 +175 @@
     def rx_callback(ok, payload):
         
-        global n_rcvd, n_right,sync_status,mode,ch,traffic_flag
+        global n_rcvd, n_right,sync_status,mode,ch,traffic_flag,ticker_start
+
+        ticker_start = datetime.now()
+        #print "inside callback"
+        #print "ticker_start ",ticker_start
         ########################## sync ####################################
         if mode == "sync":
@@ -190 +201 @@
         ######################### traffic #################################
         if mode == "traffic":
+        
+        
+        
+                
             if ok: 
                 (data_header,) = struct.unpack('!s', payload[0])
@@ -314 +329 @@
         
     # build the graph
-
+        print "printing modulation scheme",demods[options_rx.modulation]
     tb = my_top_block(mods[options_tx.modulation],
                       demods[options_rx.modulation],
@@ -331 +346 @@
        
     # Scan all channels first for inital data
-    time.sleep(0.1)
+    #time.sleep(0.1)
 
     print "\n[[ Scanning channels for network nodes ]]\n"
@@ -416 +431 @@
                         continue
 
-                ch_energy = tb.rxpath.probe.level() #check if primary user is present
-                
-                if int(ch_energy) > 1.5e8: #if primary user is there then dont transmit on this channel
-                    stop_time = datetime.now()    
-                    _elapsed_time  = start_time - stop_time
-                    elapsed_time = _elapsed_time.seconds
-                    print "\n[[ Primary User Detected:  Evacuating Current Channel ]]\n"
-                    print "\n[[ Scanning channels for network nodes ]]\n"
-                    mode = "sync"
-                    return_flag = 1
+                #ch_energy = tb.rxpath.probe.level() #check if primary user is present
+                time_right_now = datetime.now()
+                #print "inside traffic , ticker_start",ticker_start
+                packet_delay = (time_right_now - ticker_start).seconds
+                #print "packet_delay ",packet_delay
+                if packet_delay >= no_packet_period:
+                        stop_time = datetime.now()    
+                        _elapsed_time  = start_time - stop_time
+                        elapsed_time = _elapsed_time.seconds
+                        print "\n[[ No data packets:  Evacuating Current Channel ]]\n"
+                        print "\n[[ Scanning channels for network nodes ]]\n"
+                        mode = "sync"
+                        mode = "sync"
+                        return_flag = 1
+                
+
+                #if int(ch_energy) > 1.5e8: #if primary user is there then dont transmit on this channel
+