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#!/usr/bin/env python
from zipfile import ZipFile
from sys import exit, argv
def detect_rise(last, sample, bit):
mask = 1 << bit
return (not last & mask) and (sample & mask)
def detect_fall(last, sample, bit):
mask = 1 << bit
return (last & mask) and (not sample & mask)
def detect_high(sample, bit):
mask = 1 << bit
return sample & mask
def detect_low(sample, bit):
mask = 1 << bit
return not sample & mask
def analyze_delays(chanmap, datafile):
m68k_clk = chanmap['M68K CLK']
m_as = chanmap['!AS']
last = False
clks = 0
as_start = 0
for line in datafile.readlines():
line = line.strip()
if line and not line.startswith(';'):
sample,_,num = line.partition('@')
sample = int(sample, 16)
if not (last is False):
if detect_rise(last, sample, m68k_clk):
clks = clks + 1
if detect_rise(last, sample, m_as):
as_clks = clks - as_start
if as_clks > 2:
print '!AS held for', as_clks, 'cycles starting (delay of ' + str(as_clks - 2) + ') at', as_start, 'and ending at', clks
elif detect_fall(last, sample, m_as):
as_start = clks
last = sample
def main(args):
if len(args) < 2:
print 'Usage: analyze_olp.py filename'
exit(1)
olpfile = ZipFile(args[1], "r")
channelfile = olpfile.open('channel.labels')
channels = [line.strip() for line in channelfile.readlines()]
channelfile.close()
chanmap = {}
for i in xrange(0, len(channels)):
chanmap[channels[i]] = i
datafile = olpfile.open('data.ols')
analyze_delays(chanmap, datafile)
if __name__ == '__main__':
main(argv)
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