printpacket(packet);
sys.stdout.flush();
-class AddressGuesser():
+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):
- s="";
+ """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):
- s="%s%02x" % (s,ord(packet[i]));
- return s;
+ 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 handle(self,packet):
+ """Handles a packet."""
#printpacket(packet);
#self.packets.append(packet);
addr=self.packetaddr(packet);
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=AddressGuesser();
+ guesser=AutoTuner();
+ guesser.init(client);
client.poke(0x00,0x00); #Stop nRF
client.poke(0x01,0x00); #Disable Shockburst
#OpenBeacon defines these in little endian as follows.
client.RF_setmaclen(2); # SETUP_AW for shortest
- #It's better to have a known fragment, when one is available.
+ #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);
- #Should end in 55 or AA depending upon the packet.
- tail=0x55
- if(len(sys.argv)>2):
- tail=int(sys.argv[2],16);
- else:
- print "Please specify a tail of 0xAA or 0x55.";
- sys.exit(1);
- client.RF_setsmac(tail);
-
#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 "Listening as %010x on %i MHz" % (client.RF_getsmac(),
+ 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:
packet=None;
while packet==None:
packet=client.RF_rxpacket();
guesser.handle(packet);
+ guesser.retune();
sys.stdout.flush();
if(sys.argv[1]=="sniffmskb"):