AutoTuner drops invalid Nordic RF MAC addresses.

[goodfet] / client / goodfet.nrf

diff --git a/client/goodfet.nrf b/client/goodfet.nrf
index 66f7f1a..48b8263 100755 (executable)
--- a/client/goodfet.nrf
+++ b/client/goodfet.nrf
@@ -28,7 +28,7 @@ def printpacket(packet):
         i=i+1;
         if i>client.packetlen: break;
         s="%s %02x" % (s,ord(foo));
-    print "%s" %s;
+    print "%s" % s;
 
 def printconfig():
     print "Encoding %s" % client.RF_getenc();
@@ -235,6 +235,129 @@ if(sys.argv[1]=="sniffprom"):
         printpacket(packet);
         sys.stdout.flush();
 
+class AutoTuner():
+    """This guesses addresses by searching through packets."""
+    #packets=[];
+    addresses={};
+    client=None;
+    def init(self,goodfet):
+        """Initializes a link to the GoodFET for autotuning."""
+        self.client=goodfet;
+    def packetaddr(self,packet):
+        """Returns a loaded packet address, including channel and rate."""
+        
+        sync=self.client.RF_getsmac()&0xFF;
+        
+        mac="";
+        #MAC,RF_CH,RATE
+        for i in range(0,5):
+            mac="%s%02x" % (mac,ord(packet[i]));
+        ch=self.client.peek(0x05);
+        rate=self.client.peek(0x06);
+        return "%02x,%s,%02x,%02x" % (
+            sync,mac,ch,rate);
+    def validmac(self,packet):
+        sync=self.client.RF_getsmac()&0xFF;
+        if (ord(packet[0])&0x80)^(sync&0x80):
+            #print "%02x%02x invalid entry." % (sync,ord(packet[0]));
+            return False;
+        return True;
+        
+    def handle(self,packet):
+        """Handles a packet."""
+        #printpacket(packet);
+        if not self.validmac(packet):
+            #print "Dropped packet:";
+            #printpacket(packet);
+            return;
+        addr=self.packetaddr(packet);
+        
+        #Increment the address count.
+        count=0;
+        try:
+            count=self.addresses[addr];
+        except:
+            pass;
+        self.addresses[addr]=count+1;
+        rate=count*1.0/len(self.addresses);
+        if self.addresses[addr]>1 or rate>0.01:
+            print "'%s' looks valid\t%i\t%0.5f" % (
+                addr,count,rate);
+        return;
+    tunecount=0;
+    def retune(self,freqmod=0x52):
+        """Tunes to another channel or preamble looking for the next packet."""
+        count=self.tunecount+1;
+        self.tunecount=count;
+        
+        #Swap the SYNC value most often.
+        sync=0xAA;
+        if count&1:
+            sync=0x55;
+        self.client.RF_setsmac(sync);
+        count=(count>>1);
+        
+        #Then the data rate.
+        rate=0;
+        
+        #This swaps between 1Mbps and 2Mbps.
+        #TODO add support for 256kbps, if anyone uses it.
+        if count&1:
+            rate=rate|0x08;
+        #print "Setting rate to 0x%02x" % rate;
+        if(rate==0x20):
+            rate=0x08;
+        self.client.poke(0x06,rate);
+        count=(count>>2);
+        
+        #Grab two packets to clear buffers.
+        #Should retune only after a few packets to reduce this delay.
+        packet=client.RF_rxpacket();
+        packet=client.RF_rxpacket();
+        return;
+        
+        
+if(sys.argv[1]=="autotune"):
+    #Reversal of transmitter code from nRF_CMD.c of OpenBeacon
+    #TODO remove all poke() calls.
+    guesser=AutoTuner();
+    guesser.init(client);
+    
+    client.poke(0x00,0x00); #Stop nRF
+    client.poke(0x01,0x00); #Disable Shockburst
+    client.poke(0x02,0x01); #Set RX Pipe 0
+    
+    #client.RF_setfreq(2481 * 10**6);
+    #client.poke(0x06,0x09); #2MBps, -18dBm in RF_SETUP
+    client.poke(0x07,0x78); #Reset status register
+    
+    #OpenBeacon defines these in little endian as follows.
+    client.RF_setmaclen(2); # SETUP_AW for shortest
+    
+    #This is determined by the MAC, which we don't yet know.
+    #AutoTuner() takes care of finding it.
+    #client.RF_setsmac(0x00AA);
+    #client.RF_setsmac(0x0055);
+    
+    #Longest length.
+    client.RF_setpacketlen(32);
+    
+    #Power radio, prime for RX, no checksum
+    client.poke(0x00,0x70|0x03); #0x08 for checksum, 0x04 for two.
+    
+    print "Autotuning as %010x on %i MHz" % (client.RF_getsmac(),
+                                           client.RF_getfreq()/10**6);
+    print "sync,mac,r5,r6";
+    #Now we're ready to get packets.
+    while 1:
+        for foo in range(1,10):
+            packet=None;
+            while packet==None:
+                packet=client.RF_rxpacket();
+            guesser.handle(packet);
+            guesser.retune();
+        sys.stdout.flush();
+
 if(sys.argv[1]=="sniffmskb"):
     #MSWK 3000 v2.0
     #TODO remove all poke() calls.