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annotate analyze_olp.py @ 466:bc9e0829ffc7

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Fix vgmplay
author Mike Pavone <pavone@retrodev.com>
date Tue, 10 Sep 2013 21:20:54 -0700
parents be9c7b3e25ee
children b290343e5664
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1 #!/usr/bin/env python
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2
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3 from zipfile import ZipFile
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4 from sys import exit, argv
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5
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6 def detect_rise(last, sample, bit):
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7 mask = 1 << bit
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8 return (not last & mask) and (sample & mask)
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9
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10 def detect_fall(last, sample, bit):
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11 mask = 1 << bit
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12 return (last & mask) and (not sample & mask)
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13
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14 def detect_high(sample, bit):
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15 mask = 1 << bit
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16 return sample & mask
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17
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18 def detect_low(sample, bit):
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19 mask = 1 << bit
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20 return not sample & mask
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21
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22 def analyze_delays(chanmap, datafile):
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23 m68k_clk = chanmap['M68K CLK']
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24 m_as = chanmap['!AS']
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25 last = False
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26 clks = 0
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27 as_start = 0
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28 for line in datafile.readlines():
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29 line = line.strip()
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30 if line and not line.startswith(';'):
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31 sample,_,num = line.partition('@')
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32 sample = int(sample, 16)
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33 if not (last is False):
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34 if detect_rise(last, sample, m68k_clk):
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35 clks = clks + 1
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36 if detect_rise(last, sample, m_as):
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37 as_clks = clks - as_start
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38 if as_clks > 2:
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39 print '!AS held for', as_clks, 'cycles starting (delay of ' + str(as_clks - 2) + ') at', as_start, 'and ending at', clks
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40 elif detect_fall(last, sample, m_as):
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41 as_start = clks
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42 last = sample
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43
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44 def main(args):
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45 if len(args) < 2:
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46 print 'Usage: analyze_olp.py filename'
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47 exit(1)
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48 olpfile = ZipFile(args[1], "r")
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49 channelfile = olpfile.open('channel.labels')
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50 channels = [line.strip() for line in channelfile.readlines()]
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51 channelfile.close()
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52 chanmap = {}
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53 for i in xrange(0, len(channels)):
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54 chanmap[channels[i]] = i
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55 datafile = olpfile.open('data.ols')
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56 analyze_delays(chanmap, datafile)
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57
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58
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59 if __name__ == '__main__':
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60 main(argv)