git.rot13.org Git - goodfet/blob - client/GoodFETCCSPI.py

   1 #!/usr/bin/env python
   2 # GoodFET Chipcon RF Radio Client
   3 #
   4 # (C) 2009, 2012 Travis Goodspeed <travis at radiantmachines.com>
   5 #
   6 # This code is being rewritten and refactored.  You've been warned!
   7
   8 import sys, time, string, cStringIO, struct, glob, os;
   9
  10 from GoodFET import GoodFET;
  11
  12 class GoodFETCCSPI(GoodFET):
  13     CCSPIAPP=0x51;
  14     CCversions={0x233d: "CC2420",
  15                 }
  16     def setup(self):
  17         """Move the FET into the CCSPI application."""
  18         self.writecmd(self.CCSPIAPP,0x10,0,self.data); #CCSPI/SETUP
  19
  20         #Set up the radio for ZigBee
  21         self.strobe(0x01);       #SXOSCON
  22         self.strobe(0x02);       #SCAL
  23         self.poke(0x11, 0x0AC2 & (~0x0800)); #MDMCTRL0, promiscuous
  24         self.poke(0x12, 0x0500); #MDMCTRL1
  25         self.poke(0x1C, 0x007F); #IOCFG0
  26         self.poke(0x19, 0x01C4); #SECCTRL0, disabling crypto
  27         #self.poke(0x19, 0x0204); #SECCTRL0, as seen elsewhere.
  28         #self.RF_setsync();
  29
  30     def ident(self):
  31         return self.peek(0x1E); #MANFIDL
  32     def identstr(self):
  33         manfidl=self.peek(0x1E);
  34         #manfidh=self.peek(0x1f);
  35         try:
  36             return "%s" % (self.CCversions[manfidl]);
  37         except:
  38             return "Unknown0x%04x" % manfidl;
  39     def trans8(self,byte):
  40         """Read and write 8 bits by CCSPI."""
  41         data=self.CCSPItrans([byte]);
  42         return ord(data[0]);
  43
  44     def trans(self,data):
  45         """Exchange data by CCSPI."""
  46         self.data=data;
  47         self.writecmd(self.CCSPIAPP,0x00,len(data),data);
  48         return self.data;
  49     def strobe(self,reg=0x00):
  50         """Strobes a strobe register, returning the status."""
  51         data=[reg];
  52         self.trans(data);
  53         return ord(self.data[0]);
  54     def CC_RFST_IDLE(self):
  55         """Switch the radio to idle mode, clearing overflows and errors."""
  56         self.strobe(0x06); #SRXOFF
  57     def CC_RFST_TX(self):
  58         """Switch the radio to TX mode."""
  59         self.strobe(0x04);  #0x05 for CCA
  60     def CC_RFST_RX(self):
  61         """Switch the radio to RX mode."""
  62         self.strobe(0x03); #RX ON
  63     def CC_RFST_CAL(self):
  64         """Calibrate strobe the radio."""
  65         self.strobe(0x02); #RX Calibrate
  66     def CC_RFST(self,state=0x00):
  67         self.strobe(state);
  68         return;
  69     def peek(self,reg,bytes=2):
  70         """Read a CCSPI Register.  For long regs, result is flipped."""
  71
  72         #Reg is ORed with 0x40 by the GoodFET.
  73         data=[reg,0,0];
  74
  75         #Automatically calibrate the len.
  76         bytes=2;
  77
  78         self.writecmd(self.CCSPIAPP,0x02,len(data),data);
  79         toret=(
  80             ord(self.data[2])+
  81             (ord(self.data[1])<<8)
  82             );
  83         return toret;
  84     def poke(self,reg,val,bytes=2):
  85         """Write a CCSPI Register."""
  86         data=[reg,(val>>8)&0xFF,val&0xFF];
  87         self.writecmd(self.CCSPIAPP,0x03,len(data),data);
  88         if self.peek(reg,bytes)!=val and reg!=0x18:
  89             print "Warning, failed to set r%02x=0x%04x, got %02x." %(
  90                 reg,
  91                 val,
  92                 self.peek(reg,bytes));
  93             return False;
  94         return True;
  95
  96     def status(self):
  97         """Read the status byte."""
  98         statusbits={0x80: "?",
  99                     0x40: "XOSC16M_STABLE",
 100                     0x20: "TX_UNDERFLOW",
 101                     0x10: "ENC_BUSY",
 102                     0x08: "TX_ACTIVE",
 103                     0x04: "LOCK",
 104                     0x02: "RSSI_VALID",
 105                     0x01: "?"};
 106         status=self.strobe(0x00);
 107         i=1;
 108         str="";
 109         while i<0x100:
 110             if status&i:
 111                str="%s %s" % (statusbits[i],str);
 112             i*=2;
 113         return str;
 114
 115     #Radio stuff begins here.
 116     def RF_setenc(self,code="802.15.4"):
 117         """Set the encoding type."""
 118         return code;
 119     def RF_getenc(self):
 120         """Get the encoding type."""
 121         return "802.15.4";
 122     def RF_getrate(self):
 123         return 0;
 124     def RF_setrate(self,rate=0):
 125         return 0;
 126     def RF_getsync(self):
 127         return self.peek(0x14);
 128     def RF_setsync(self,sync=0xa70F):
 129         """Set the SYNC preamble.
 130         Use 0xA70F for 0xA7."""
 131         self.poke(0x14,sync);
 132         return;
 133
 134     def RF_setkey(self,key):
 135         """Sets the first key for encryption to the given argument."""
 136         print "ERROR: Forgot to set the key.";
 137
 138         return;
 139     def RF_setnonce(self,key):
 140         """Sets the first key for encryption to the given argument."""
 141         print "ERROR: Forgot to set the nonce.";
 142
 143         return;
 144
 145     def RF_setfreq(self,frequency):
 146         """Set the frequency in Hz."""
 147         mhz=frequency/1000000;
 148         #fsctrl=0x8000; #
 149         fsctrl=self.peek(0x18)&(~0x3FF);
 150         fsctrl=fsctrl+int(mhz-2048)
 151         self.poke(0x18,fsctrl);
 152         #self.CC_RFST_IDLE();
 153         self.strobe(0x02);#SCAL
 154         time.sleep(0.01);
 155         self.strobe(0x03);#SRXON
 156     def RF_getfreq(self):
 157         """Get the frequency in Hz."""
 158         fsctrl=self.peek(0x18);
 159         mhz=2048+(fsctrl&0x3ff)
 160         return mhz*1000000;
 161     def RF_setchan(self,channel):
 162         """Set the ZigBee/802.15.4 channel number."""
 163         if channel < 11 or channel > 26:
 164             print "Only 802.15.4 channels 11 to 26 are currently supported.";
 165         else:
 166             self.RF_setfreq( ( (channel-11)*5 + 2405 ) * 1000000 );
 167     def RF_getsmac(self):
 168         """Return the source MAC address."""
 169         return 0xdeadbeef;
 170     def RF_setsmac(self,mac):
 171         """Set the source MAC address."""
 172         return 0xdeadbeef;
 173     def RF_gettmac(self):
 174         """Return the target MAC address."""
 175         return 0xdeadbeef;
 176     def RF_settmac(self,mac):
 177         """Set the target MAC address."""
 178         return 0xdeadbeef;
 179     def RF_getrssi(self):
 180         """Returns the received signal strength, with a weird offset."""
 181         rssival=self.peek(0x13)&0xFF; #raw RSSI register
 182         return rssival^0x80;
 183
 184     def peekram(self,adr,count):
 185         """Peeks data from CC2420 RAM."""
 186         data=[
 187             adr&0xFF,adr>>8,     # Address first.
 188             count&0xFF,count>>8  # Then length.
 189             ];
 190         self.writecmd(self.CCSPIAPP,0x84,len(data),data);
 191         return self.data;
 192     def pokeram(self,adr,data):
 193         """Pokes data into CC2420 RAM."""
 194         data=[adr&0xFF, adr>>8]+data;
 195         self.writecmd(self.CCSPIAPP,0x85,len(data),data);
 196         return;
 197
 198     lastpacket=range(0,0xff);
 199     def RF_rxpacket(self):
 200         """Get a packet from the radio.  Returns None if none is
 201         waiting."""
 202
 203         data="\0";
 204         self.data=data;
 205         self.writecmd(self.CCSPIAPP,0x80,len(data),data);
 206         buffer=self.data;
 207
 208         self.lastpacket=buffer;
 209         if(len(buffer)==0):
 210             return None;
 211
 212         return buffer;
 213     def RF_rxpacketdec(self):
 214         """Get and decrypt a packet from the radio.  Returns None if
 215         none is waiting."""
 216
 217         data="\0";
 218         self.data=data;
 219         self.writecmd(self.CCSPIAPP,0x90,len(data),data);
 220         buffer=self.data;
 221
 222         self.lastpacket=buffer;
 223         if(len(buffer)==0):
 224             return None;
 225
 226         return buffer;
 227
 228     def RF_txpacket(self,packet):
 229         """Send a packet through the radio."""
 230         self.writecmd(self.CCSPIAPP,0x81,len(packet),packet);
 231         #time.sleep(1);
 232         #self.strobe(0x09);
 233         return;
 234
 235     def RF_reflexjam(self,duration=0):
 236         """Place the device into reflexive jamming mode."""
 237         data = [duration&0xff,
 238                 (duration>>8)&0xff];
 239         self.writecmd(self.CCSPIAPP,0xA0,len(data),data);
 240         return;
 241
 242     def RF_reflexjam_autoack(self):
 243         """Place the device into reflexive jamming mode
 244            and that also sends a forged ACK if needed."""
 245         data = "";
 246         self.writecmd(self.CCSPIAPP,0xA1,len(data),data);
 247         print "Got:", data, "and", self.data
 248         return;
 249
 250     def RF_modulated_spectrum(self):
 251         """Hold a carrier wave on the present frequency."""
 252         # print "Don't know how to hold a carrier.";
 253         # 33.1 p.55:
 254         #  reset chip
 255         #  SXOSCON
 256         #  set MDMCTRL1.TX_MODE to 3   0x12  3:2
 257         #  STXON                            0x04
 258
 259         mdmctrl1=self.peek(0x12);
 260         #print "mdmctrl1 was %04x" % mdmctrl1;
 261         mdmctrl1=mdmctrl1|0x00c0;  #MDMCTRL1.TX_MODE = 3
 262         self.poke(0x12, mdmctrl1); #MDMCTRL1
 263
 264         mdmctrl1=self.peek(0x12);
 265         #print "mdmctrl1 is %04x" % mdmctrl1;
 266
 267         # http://e2e.ti.com/support/low_power_rf/f/155/t/15914.aspx?PageIndex=2
 268         #   suggests this
 269         self.strobe(0x02);         #STXCAL
 270         #print "STXCAL status: %s" % self.status()
 271
 272         # is this necessary?
 273         self.strobe(0x09);         #SFLUSHTX
 274         #print "SFLUSHTX status: %s" % self.status()
 275
 276         self.strobe(0x04);         #STXON
 277         #print "STXON status: %s" % self.status()
 278
 279     def RF_carrier(self):
 280         """Hold a carrier wave on the present frequency."""
 281         # print "Don't know how to hold a carrier.";
 282         # 33.1 p.54:
 283         #  reset chip
 284         #  SXOSCON
 285         #  set MDMCTRL1.TX_MODE to 2 or 3   0x12  3:2
 286         #  set DACTST to 0x1800             0x2E
 287         #  STXON                            0x04
 288
 289         mdmctrl1=self.peek(0x12);
 290         #print "mdmctrl1 was %04x" % mdmctrl1;
 291         mdmctrl1=mdmctrl1|0x0080;
 292         mdmctrl1=mdmctrl1&0x0080;  #MDMCTRL1.TX_MODE = 2
 293         self.poke(0x12, mdmctrl1); #MDMCTRL1
 294
 295         mdmctrl1=self.peek(0x12);
 296         #print "mdmctrl1 is %04x" % mdmctrl1;
 297
 298         self.poke(0x2E, 0x1800);   #DACTST
 299         dactst=self.peek(0x2E);
 300         #print "dactst is %04x" % dactst;
 301
 302         # see above for why this is here
 303         self.strobe(0x02);         #STXCAL
 304         #print "STXCAL status: %s" % self.status()
 305         self.strobe(0x09);         #SFLUSHTX
 306         #print "SFLUSHTX status: %s" % self.status()
 307
 308         self.strobe(0x04);         #STXON
 309         #print "STXON status: %s" % self.status()
 310
 311     def RF_promiscuity(self,promiscuous=1):
 312         mdmctrl0=self.peek(0x11);
 313         if promiscuous>0:
 314             mdmctrl0=mdmctrl0&(~0x800);
 315         else:
 316             mdmctrl0=mdmctrl0|0x800;
 317         self.poke(0x11,mdmctrl0);
 318         return;
 319     def RF_autocrc(self,autocrc=1):
 320         mdmctrl0=self.peek(0x11);
 321         if autocrc==0:
 322             mdmctrl0=mdmctrl0&(~0x0020);
 323         else:
 324             mdmctrl0=mdmctrl0|0x0020;
 325         self.poke(0x11,mdmctrl0);
 326         return;
 327     def RF_autoack(self,autoack=1):
 328         mdmctrl0=self.peek(0x11);
 329         if autoack==0:
 330             mdmctrl0=mdmctrl0&(~0x0010);
 331         else:
 332             mdmctrl0=mdmctrl0|0x0010;
 333         self.poke(0x11,mdmctrl0);
 334         return;
 335     packetlen=16;
 336     def RF_setpacketlen(self,len=16):
 337         """Set the number of bytes in the expected payload."""
 338         #self.poke(0x11,len);
 339         self.packetlen=len;
 340     def RF_getpacketlen(self):
 341         """Set the number of bytes in the expected payload."""
 342         #len=self.peek(0x11);
 343         self.packetlen=len;
 344         return len;
 345     maclen=5;
 346     def RF_getmaclen(self):
 347         """Get the number of bytes in the MAC address."""
 348         choices=[0, 3, 4, 5];
 349         choice=self.peek(0x03)&3;
 350         self.maclen=choices[choice];
 351         return self.maclen;
 352     def RF_setmaclen(self,len):
 353         """Set the number of bytes in the MAC address."""
 354         choices=["illegal", "illegal", "illegal",
 355                  1, 2, 3];
 356         choice=choices[len];
 357         self.poke(0x03,choice);
 358         self.maclen=len;
 359     def printpacket(self,packet,prefix="#"):
 360         s="";
 361         i=0;
 362         for foo in packet:
 363             s="%s %02x" % (s,ord(foo));
 364         print "%s%s" % (prefix,s);
 365
 366     def printdissect(self,packet):
 367         try:
 368             from scapy.all import Dot15d4
 369         except ImportError:
 370             print "To use packet disection, Scapy must be installed and have the Dot15d4 extension present."
 371             print "try: hg clone http://hg.secdev.org/scapy-com";
 372             print "     sudo ./setup.py install";
 373         self.printpacket(packet);
 374         try:
 375             scapyd = Dot15d4(packet[1:]);
 376             scapyd.show();
 377         except:
 378             pass;