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

   1 #!/usr/bin/env python
   2 # GoodFET Client Library
   3 #
   4 # (C) 2009 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, serial, os;
   9
  10
  11 class GoodFET:
  12     """GoodFET Client Library"""
  13
  14     GLITCHAPP=0x71;
  15
  16     def __init__(self, *args, **kargs):
  17         self.data=[0];
  18     def timeout(self):
  19         print "timeout\n";
  20     def serInit(self, port=None):
  21         """Open the serial port"""
  22
  23         if port is None and os.environ.get("GOODFET")!=None:
  24             glob_list = glob.glob(os.environ.get("GOODFET"));
  25             if len(glob_list) > 0:
  26                 port = glob_list[0];
  27         if port is None:
  28             glob_list = glob.glob("/dev/tty.usbserial*");
  29             if len(glob_list) > 0:
  30                 port = glob_list[0];
  31         if port is None:
  32             glob_list = glob.glob("/dev/ttyUSB*");
  33             if len(glob_list) > 0:
  34                 port = glob_list[0];
  35
  36         self.serialport = serial.Serial(
  37             port,
  38             #9600,
  39             115200,
  40             parity = serial.PARITY_NONE
  41             )
  42
  43         #This might cause problems, but it makes failure graceful.
  44         #self.serialport._timeout = 5;
  45
  46         #Explicitly set RTS and DTR to halt board.
  47         self.serialport.setRTS(1);
  48         self.serialport.setDTR(1);
  49         #Drop DTR, which is !RST, low to begin the app.
  50         self.serialport.setDTR(0);
  51         self.serialport.flushInput()
  52         self.serialport.flushOutput()
  53
  54         #Read and handle the initial command.
  55         #time.sleep(1);
  56         self.readcmd(); #Read the first command.
  57         if(self.verb!=0x7F):
  58             print "Verb %02x is wrong.  Incorrect firmware?" % self.verb;
  59         #print "Connected."
  60     def getbuffer(self,size=0x1c00):
  61         writecmd(0,0xC2,[size&0xFF,(size>>16)&0xFF]);
  62         print "Got %02x%02x buffer size." % (self.data[1],self.data[0]);
  63     def writecmd(self, app, verb, count=0, data=[]):
  64         """Write a command and some data to the GoodFET."""
  65         self.serialport.write(chr(app));
  66         self.serialport.write(chr(verb));
  67
  68         #if data!=None:
  69         #    count=len(data); #Initial count ignored.
  70
  71         #print "TX %02x %02x %04x" % (app,verb,count);
  72
  73         #little endian 16-bit length
  74         self.serialport.write(chr(count&0xFF));
  75         self.serialport.write(chr(count>>8));
  76
  77         #print "count=%02x, len(data)=%04x" % (count,len(data));
  78
  79         if count!=0:
  80             if(isinstance(data,list)):
  81                 for i in range(0,count):
  82                 #print "Converting %02x at %i" % (data[i],i)
  83                     data[i]=chr(data[i]);
  84             #print type(data);
  85             outstr=''.join(data);
  86             self.serialport.write(outstr);
  87         if not self.besilent:
  88             self.readcmd();
  89
  90     besilent=0;
  91     app=0;
  92     verb=0;
  93     count=0;
  94     data="";
  95
  96     def readcmd(self):
  97         """Read a reply from the GoodFET."""
  98         while 1:
  99             #print "Reading...";
 100             self.app=ord(self.serialport.read(1));
 101             #print "APP=%2x" % self.app;
 102             self.verb=ord(self.serialport.read(1));
 103             #print "VERB=%02x" % self.verb;
 104             self.count=(
 105                 ord(self.serialport.read(1))
 106                 +(ord(self.serialport.read(1))<<8)
 107                 );
 108
 109             #Debugging string; print, but wait.
 110             if self.app==0xFF and self.verb==0xFF:
 111                 print "# DEBUG %s" % self.serialport.read(self.count);
 112             else:
 113                 self.data=self.serialport.read(self.count);
 114                 return self.data;
 115     #Glitching stuff.
 116     def glitchAPP(self,app):
 117         """Glitch into a device by its application."""
 118         self.data=[app&0xff];
 119         self.writecmd(self.GLITCHAPP,0x80,1,self.data);
 120         #return ord(self.data[0]);
 121     def glitchVERB(self,app,verb, data):
 122         """Glitch during a transaction.."""
 123         self.data=[app&0xff, verb&0xFF]+data;
 124         self.writecmd(self.GLITCHAPP,0x81,len(self.data),self.data);
 125         #return ord(self.data[0]);
 126     def glitchVoltages(self,low=0x0880, high=0x0fff):
 127         """Set glitching voltages. (0x0fff is max.)"""
 128         self.data=[low&0xff, (low>>8)&0xff,
 129                    high&0xff, (high>>8)&0xff];
 130         self.writecmd(self.GLITCHAPP,0x90,4,self.data);
 131         #return ord(self.data[0]);
 132     def glitchRate(self,count=0x0800):
 133         """Set glitching count period."""
 134         self.data=[count&0xff, (count>>8)&0xff];
 135         self.writecmd(self.GLITCHAPP,0x91,2,
 136                       self.data);
 137         #return ord(self.data[0]);
 138
 139
 140     #Monitor stuff
 141     def silent(self,s=0):
 142         """Transmissions halted when 1."""
 143         self.besilent=s;
 144         print "besilent is %i" % self.besilent;
 145         self.writecmd(0,0xB0,1,[s]);
 146
 147     def out(self,byte):
 148         """Write a byte to P5OUT."""
 149         self.writecmd(0,0xA1,1,[byte]);
 150     def dir(self,byte):
 151         """Write a byte to P5DIR."""
 152         self.writecmd(0,0xA0,1,[byte]);
 153     def call(self,adr):
 154         """Call to an address."""
 155         self.writecmd(0,0x30,2,
 156                       [adr&0xFF,(adr>>8)&0xFF]);
 157     def execute(self,code):
 158         """Execute supplied code."""
 159         self.writecmd(0,0x31,2,#len(code),
 160                       code);
 161     def peekbyte(self,address):
 162         """Read a byte of memory from the monitor."""
 163         self.data=[address&0xff,address>>8];
 164         self.writecmd(0,0x02,2,self.data);
 165         #self.readcmd();
 166         return ord(self.data[0]);
 167     def peekword(self,address):
 168         """Read a word of memory from the monitor."""
 169         return self.peekbyte(address)+(self.peekbyte(address+1)<<8);
 170     def pokebyte(self,address,value):
 171         """Set a byte of memory by the monitor."""
 172         self.data=[address&0xff,address>>8,value];
 173         self.writecmd(0,0x03,3,self.data);
 174         return ord(self.data[0]);
 175     def dumpmem(self,begin,end):
 176         i=begin;
 177         while i<end:
 178             print "%04x %04x" % (i, self.peekword(i));
 179             i+=2;
 180     def monitor_ram_pattern(self):
 181         """Overwrite all of RAM with 0xBEEF."""
 182         self.writecmd(0,0x90,0,self.data);
 183         return;
 184     def monitor_ram_depth(self):
 185         """Determine how many bytes of RAM are unused by looking for 0xBEEF.."""
 186         self.writecmd(0,0x91,0,self.data);
 187         return ord(self.data[0])+(ord(self.data[1])<<8);
 188
 189     #Baud rates.
 190     baudrates=[115200,
 191                9600,
 192                19200,
 193                38400,
 194                57600,
 195                115200];
 196     def setBaud(self,baud):
 197         """Change the baud rate.  TODO fix this."""
 198         rates=self.baudrates;
 199         self.data=[baud];
 200         print "Changing FET baud."
 201         self.serialport.write(chr(0x00));
 202         self.serialport.write(chr(0x80));
 203         self.serialport.write(chr(1));
 204         self.serialport.write(chr(baud));
 205
 206         print "Changed host baud."
 207         self.serialport.setBaudrate(rates[baud]);
 208         time.sleep(1);
 209         self.serialport.flushInput()
 210         self.serialport.flushOutput()
 211
 212         print "Baud is now %i." % rates[baud];
 213         return;
 214     def readbyte(self):
 215         return ord(self.serialport.read(1));
 216     def findbaud(self):
 217         for r in self.baudrates:
 218             print "\nTrying %i" % r;
 219             self.serialport.setBaudrate(r);
 220             #time.sleep(1);
 221             self.serialport.flushInput()
 222             self.serialport.flushOutput()
 223
 224             for i in range(1,10):
 225                 self.readbyte();
 226
 227             print "Read %02x %02x %02x %02x" % (
 228                 self.readbyte(),self.readbyte(),self.readbyte(),self.readbyte());
 229     def monitortest(self):
 230         """Self-test several functions through the monitor."""
 231         print "Performing monitor self-test.";
 232
 233         if self.peekword(0x0c00)!=0x0c04 and self.peekword(0x0c00)!=0x0c06:
 234             print "ERROR Fetched wrong value from 0x0c04.";
 235         self.pokebyte(0x0021,0); #Drop LED
 236         if self.peekbyte(0x0021)!=0:
 237             print "ERROR, P1OUT not cleared.";
 238         self.pokebyte(0x0021,1); #Light LED
 239
 240         print "Self-test complete.";
 241
 242
 243
 244     def I2Csetup(self):
 245         """Move the FET into the I2C application."""
 246         self.writecmd(0x02,0x10,0,self.data); #SPI/SETUP
 247     def I2Cstart(self):
 248         """Start an I2C transaction."""
 249         self.writecmd(0x02,0x20,0,self.data); #SPI/SETUP
 250     def I2Cstop(self):
 251         """Stop an I2C transaction."""
 252         self.writecmd(0x02,0x21,0,self.data); #SPI/SETUP
 253     def I2Cread(self,len=1):
 254         """Read len bytes by I2C."""
 255         self.writecmd(0x02,0x00,1,[len]); #SPI/SETUP
 256         return self.data;
 257     def I2Cwrite(self,bytes):
 258         """Write bytes by I2C."""
 259         self.writecmd(0x02,0x01,len(bytes),bytes); #SPI/SETUP
 260         return ord(self.data[0]);