git.rot13.org Git - goodfet/blob - reports/avr/glitch/stability.py

   1 #!/usr/bin/env python
   2
   3 import sys;
   4 import binascii;
   5
   6 sys.path.append('../../../client/')
   7
   8 from GoodFETAVR import GoodFETAVR;
   9 from intelhex import IntelHex16bit, IntelHex;
  10
  11 #Initialize FET and set baud rate
  12 client=GoodFETAVR();
  13 client.serInit()
  14
  15 #Connect to target
  16 client.start();
  17
  18 trials=100; #10,000 is smooth
  19 skip=0x1;
  20
  21 start=0x860;
  22 stop=0x890;
  23
  24
  25
  26 print "# Threshold voltage test."
  27 print "# %i trials/point, %i steps/point" % (trials, skip);
  28 print "# DAC Range %04x to %04x" % (start, stop);
  29 print "# Generated by GoodFET, http://goodfet.sf.net/"
  30 for voltage in range(start,stop,skip):
  31
  32
  33     client.glitchVoltages(voltage, voltage);
  34     count=0;
  35     for i in range(1,trials):
  36         client.start();
  37         if(client.lockbits()==0xFF):
  38             count+=1;
  39     print "%f, %f" % (voltage*(3.3/4096.0),count*1.0/trials);
  40