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

   1 #!/usr/bin/env python
   2 # GoodFET Client Application
   3 #
   4 # (C) 2009 Travis Goodspeed <travis at radiantmachines.com>
   5 #
   6 # This code is ugly as sin, for bootstrapping the firmware only.
   7 # Rewrite cleanly as soon as is convenient.
   8
   9 import sys, time, string, cStringIO, struct
  10 sys.path.append("/usr/lib/tinyos")
  11 import serial
  12
  13
  14 class Client:
  15     def __init__(self, *args, **kargs):
  16         print "inited\n";
  17     def timeout(self):
  18         print "timout\n";
  19     def serInit(self, port):
  20         """Open the serial port"""
  21         self.serialport = serial.Serial(
  22             port,
  23             9600,
  24             parity = serial.PARITY_NONE
  25             )
  26         #Drop DTR, which is !RST, low to begin the app.
  27         self.serialport.setDTR(0);
  28         self.serialport.flushInput()
  29         self.serialport.flushOutput()
  30
  31         #Read and handle the initial command.
  32         time.sleep(1);
  33         client.readcmd();
  34         if(self.verb!=0x7F):
  35             print "Verb is wrong.  Incorrect firmware?";
  36
  37
  38     def writecmd(self, app, verb, count, data):
  39         """Write a command and some data to the GoodFET."""
  40         self.serialport.write(chr(app));
  41         self.serialport.write(chr(verb));
  42         self.serialport.write(chr(count));
  43         #print "count=%02x, len(data)=%04x" % (count,len(data));
  44         if count!=0:
  45             for d in data:
  46                 self.serialport.write(chr(d));
  47         #self.readcmd();  #Uncomment this later, to ensure a response.
  48     def readcmd(self):
  49         """Read a reply from the GoodFET."""
  50         self.app=ord(self.serialport.read(1));
  51         self.verb=ord(self.serialport.read(1));
  52         self.count=ord(self.serialport.read(1));
  53         if self.count>0:
  54             self.data=self.serialport.read(self.count);
  55         #print "%02x %02x %02x" % (self.app, self.verb, self.count);
  56
  57     #Monitor stuff
  58     def peekbyte(self,address):
  59         """Read a byte of memory from the monitor."""
  60         self.data=[address&0xff,address>>8];
  61         self.writecmd(0,0x02,2,self.data);
  62         self.readcmd();
  63         return ord(self.data[0]);
  64     def peekword(self,address):
  65         """Read a word of memory from the monitor."""
  66         return self.peekbyte(address)+(self.peekbyte(address+1)<<8);
  67     def pokebyte(self,address,value):
  68         """Set a byte of memory by the monitor."""
  69         self.data=[address&0xff,address>>8,value];
  70         self.writecmd(0,0x03,3,self.data);
  71         self.readcmd();
  72         #print "POKE returned %02x" % ord(self.data[0]);
  73         return ord(self.data[0]);
  74
  75     def monitortest(self):
  76         """Self-test several functions through the monitor."""
  77         print "Performing self-test.";
  78
  79         if self.peekword(0x0c00)!=0x0c04:
  80             print "ERROR Fetched wrong value from 0x0c04.";
  81         self.pokebyte(0x0021,0); #Drop LED
  82         if self.peekbyte(0x0021)!=0:
  83             print "ERROR, P1OUT not cleared.";
  84         self.pokebyte(0x0021,1); #Light LED
  85
  86         print "Self-test complete.";
  87
  88     def spisetup(self):
  89         """Moved the FET into the SPI application."""
  90         print "Initializing SPI.";
  91         self.writecmd(1,0x10,0,self.data); #SPI/SETUP
  92         self.readcmd();
  93     def spitrans8(self,byte):
  94         """Read and write 8 bits by SPI."""
  95         self.data=[byte];
  96         self.writecmd(1,0,1,self.data);    #SPI exchange
  97         self.readcmd();
  98
  99         if self.app!=1 or self.verb!=0:
 100             print "Error in SPI transaction; app=%02x, verb=%02x" % (self.app, self.verb);
 101         return ord(self.data[0]);
 102
 103 client=Client();
 104 client.serInit("/dev/ttyUSB0")
 105
 106 client.monitortest();
 107
 108 client.spisetup();
 109 while 1:
 110     print "%02x" % client.spitrans8(5);
 111     time.sleep(0.1);