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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 get_value(sample, bits):
value = 0
for i in xrange(0, len(bits)):
bit = bits[i]
value |= (sample >> bit & 1) << i
return value
def swizzle_mode4(row, col):
return (col & 1) | (row << 1) | (col << 8 & 0xFE00)
def analyze_delays(chanmap, datafile):
if 'M68K_CLK' in chanmap:
m68k_clk = chanmap['M68K CLK']
elif 'CLK' in chanmap:
m68k_clk = chanmap['CLK']
m_as = chanmap['!AS']
ram_oe = chanmap['RAM !LOE/!RFSH']
ram_ce = chanmap['RAM !CE']
last = False
prev = False
prevRefresh = 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:
if not (prev is False):
print '!AS held for', as_clks, 'cycles starting (delay of ' + str(as_clks - 2) + ') at', as_start, 'and ending at', clks, 'delta since last delay:', as_start - prev
else:
print '!AS held for', as_clks, 'cycles starting (delay of ' + str(as_clks - 2) + ') at', as_start, 'and ending at', clks
prev = as_start
elif detect_fall(last, sample, m_as):
as_start = clks
if detect_fall(last, sample, ram_oe) and detect_high( sample, ram_ce):
if prevRefresh is False:
print 'RAM refresh at ', clks
else:
print 'RAM refresh at', clks, 'delta since last:', clks-prevRefresh
prevRefresh = clks
last = sample
def analyze_refresh(chanmap, datafile):
if 'M68K_CLK' in chanmap:
m68k_clk = chanmap['M68K CLK']
elif 'CLK' in chanmap:
m68k_clk = chanmap['CLK']
ram_oe = chanmap['RAM !LOE/!RFSH']
ram_ce = chanmap['RAM !CE']
clks = 0
last = False
prevRefresh = False
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_fall(last, sample, ram_oe) and detect_high( sample, ram_ce):
if prevRefresh is False:
print 'RAM refresh at ', clks
else:
print 'RAM refresh at', clks, 'delta since last:', clks-prevRefresh
prevRefresh = clks
last = sample
table_start = 0x3800
table_end = table_start + 0x600
sat_start = 0x3F00 #0x3E00
sat_xname = sat_start + 0x80
sat_end = sat_start + 0x100
def analyze_vram(chanmap, datafile):
address_bits = [chanmap['AD{0}'.format(i)] for i in xrange(0, 8)]
ras = chanmap['!RAS']
cas = chanmap['!CAS']
hsync = chanmap['!HSYNC']
state = 'begin'
last = False
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_fall(last, sample, hsync):
print 'HSYNC low @ {0}'.format(num)
elif detect_rise(last, sample, hsync):
print 'HSYNC high @ {0}'.format(num)
if state == 'begin':
if detect_fall(last, sample, ras):
state = 'ras'
row = get_value(sample, address_bits)
elif detect_fall(last, sample, cas):
state = 'cas'
elif state == 'ras':
if detect_fall(last, sample, cas):
col = get_value(sample, address_bits)
address = swizzle_mode4(row, col)
if address < table_end and address >= table_start:
offset = (address - table_start)/2
desc = 'Map Row {0} Col {1}'.format(offset / 32, offset & 31)
elif address >= sat_start and address < sat_xname:
offset = address - sat_start
desc = 'Sprite {0} Y Read'.format(offset)
elif address >= sat_xname and address < sat_end:
offset = address - sat_xname
desc = 'Sprite {0} X/Name Read'.format(offset / 2)
else:
desc = 'Tile {0} Row {1}'.format(address / 32, ((address / 4) & 7) + (0.5 if address & 2 else 0))
print '{0:02X}:{1:02X} - {2:04X} @ {3} - {4}'.format(row, col, address, num, desc)
state = 'begin'
elif state == 'cas':
if detect_fall(last, sample, ras):
print 'refresh @ {0}'.format(num)
state = 'begin'
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()
print channels
chanmap = {}
for i in xrange(0, len(channels)):
chanmap[channels[i]] = i
datafile = olpfile.open('data.ols')
#analyze_delays(chanmap, datafile)
analyze_vram(chanmap, datafile)
datafile.close()
#datafile = olpfile.open('data.ols')
#analyze_refresh(chanmap, datafile)
if __name__ == '__main__':
main(argv)
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