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kfx2bs.py
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# Kryoflux raw stream data to FD-Shield bit stream data converter
import sys
import os
import re
import glob
import argparse
import matplotlib.pyplot as plt
from floppylib import *
def histogram(data):
fig = plt.figure()
ax1 = fig.add_subplot(1,2,1)
ax2 = fig.add_subplot(1,2,2)
ax1.grid(True)
ax1.set_title('linear')
ax1.hist(data, bins=256, range=(0,256), histtype='stepfilled', orientation='vertical', log=False)
ax2.grid(True)
ax2.set_title('log')
ax2.hist(data, bins=256, range=(0,256), histtype='stepfilled', orientation='vertical', log=True)
plt.show()
class KFX_stream:
def __init__(self):
self.pos = 0
pass
def open(self, file):
with open(file, 'rb') as f:
self.streamdata = f.read()
def get_byte(self, pos=-1):
if pos == -1:
if self.pos < len(self.streamdata):
res = self.streamdata[self.pos]
self.pos += 1
return res
return -1 # end of file
else:
if pos < len(self.streamdata):
res = self.streamdata[pos]
return res
return -1
def get_word(self, pos=-1):
res = 0
if pos == -1:
dt1 = self.get_byte()
if dt1 == -1:
return -1
dt2 = self.get_byte()
if dt2 == -1:
return -1
res = (dt2<<8) | dt1
return res
else:
dt1 = self.get_byte(pos)
if dt1 == -1:
return -1
dt2 = self.get_byte(pos+1)
if dt2 == -1:
return -1
res = (dt2<<8) | dt1
return res
def get_dword(self, pos=-1):
res = 0
if pos == -1:
dt1 = self.get_byte()
if dt1 == -1:
return -1
dt2 = self.get_byte()
if dt2 == -1:
return -1
dt3 = self.get_byte()
if dt3 == -1:
return -1
dt4 = self.get_byte()
if dt4 == -1:
return -1
res = (dt4<<24) | (dt3<<16) | (dt2<<8) | dt1
return res
else:
dt1 = self.get_byte(pos)
if dt1 == -1:
return -1
dt2 = self.get_byte(pos+1)
if dt2 == -1:
return -1
dt3 = self.get_byte(pos+3)
if dt3 == -1:
return -1
dt4 = self.get_byte(pos+4)
if dt4 == -1:
return -1
res = (dt4<<24) | (dt3<<16) | (dt2<<8) | dt1
return res
def get_variable_len(self, len, pos=-1):
res = []
if pos == -1:
for i in range(len):
dt = self.get_byte()
if dt == -1:
return -1
res.append(dt)
return res
else:
for i in range(len):
dt = self.get_byte(pos+i)
if dt == -1:
return -1
res.append(dt)
return res
def decode_track(file):
"""
Decode a KryoFlux RAW file (1 track)
Args:
file : KryoFlux RAW bitstream file name
Returns:
stream : Floppy pulse interval (count in sck)
stream_pos : Bit stream position (byte position of corresponding stream data in the stream buffer)
index_data : Index hole data [ (stream_position0, sample_counter0, index_counter0), (), ...]
sck : KryoFlux sampling clock rate (Hz)
"""
bs = KFX_stream()
bs.open(file)
ovf = 0
dur = 0
stream = []
pos = 0
stream_pos = []
sck = 0
ick = 0
stream_position = 0
sample_counter = 0
index_counter = 0
index_data = []
prev_stream_position = 0
prev_sample_counter = 0
prev_index_counter = 0
while True:
dt = bs.get_byte()
if dt == -1:
break
stream_len = 0
if dt >= 0x0e and dt <= 0xff:
dur = dt + ovf
stream_len = 1
elif dt <= 0x07: # FLUX2
val = bs.get_byte()
dur = (dt<<8) + val + ovf
stream_len = 2
elif dt == 0x08: # NOP1
stream_len = 1
elif dt == 0x09: # NOP2
bs.get_byte()
stream_len = 2
elif dt == 0x0a: # NOP3
bs.get_byte()
bs.get_byte()
stream_len = 3
elif dt == 0x0b: # OVL16
ovf += 0x10000
stream_len = 1
elif dt == 0x0c: # FLUX3
dur = bs.get_byte() << 8
dur += bs.get_byte() + ovf
stream_len = 3
elif dt == 0x0d: # OOB
dt = bs.get_byte()
siz = bs.get_word()
if dt == 0x00: # Invalid
data = bs.get_variable_len(siz)
if dt == 0x01: # StreamInfo
data = bs.get_variable_len(siz)
if dt == 0x02: # Index
stream_position = bs.get_dword()
sample_counter = bs.get_dword()
index_counter = bs.get_dword()
index_data.append((stream_position, sample_counter, index_counter))
"""
print(index_data[-1])
if len(index_data)>1:
print(index_data[-1][0]-index_data[-2][0],
index_data[-1][1]-index_data[-2][1],
index_data[-1][2]-index_data[-2][2])
"""
if len(index_data)==2:
try:
spin_time = (index_data[-1][2]-index_data[-2][2]) * (1/ick)
rpm = (1/spin_time) * 60
except ZeroDivisionError:
spin_time = 0
rpm = 0
print(', {:.2f} RPM'.format(rpm), end='')
prev_stream_position = stream_position
prev_sample_counter = sample_counter
prev_index_counter = index_counter
if dt == 0x03: # StreamEnd
data = bs.get_variable_len(siz)
if dt == 0x04: #KFInfo
data = bs.get_variable_len(siz)
string = bytearray(data).decode('UTF-8')
string = string.translate(str.maketrans({' ':'', '\0':'', '\n':''}))
params = string.split(',')
for param in params:
if ('sck' in param):
sck = eval(param.split('=')[1])
if ('ick' in param):
ick = eval(param.split('=')[1])
if sck!=0 and ick!=0:
print(', SCK={:.2f}MHz, ICK={:.2f}MHz'.format(sck/1e6, ick/1e6), end='')
if dt == 0x0d: # EOF
data = bs.get_variable_len(siz)
break
if dur != 0:
stream.append(dur)
stream_pos.append(pos)
pos += stream_len
dur = 0
ovf = 0
print()
return stream, stream_pos, index_data, sck
def get_track(stream, stream_pos, index):
result = []
if len(index)<2:
return []
index1 = index[-2][0] # stream_position
index2 = index[-1][0]
for s, pos in zip(stream, stream_pos):
if pos>index1 and pos<index2:
result.append(s)
return result
def encode(stream, f):
count = 0
for s in stream:
if s <= ord('z')-ord(' '):
if count % 100==0:
f.write('~')
f.write(chr(s + ord(' ')))
if count % 100==99:
f.write('\n')
count += 1
def main(args):
# Get all 'raw' files and sort them
dir_name = args.input
files = glob.glob(dir_name+'/*.raw')
files.sort()
dirs = os.path.split(dir_name)
base_dir = dirs[-1]
fdshield_clk = args.clk_spd # Clock speed of FD-Shield (default: 4MHz)
out_file = base_dir + '.log'
print(os.path.join(args.input, '*.raw'), '->', out_file)
with open(out_file, 'w') as f:
count = 0
# Process all raw files in the directory
for file in files:
m = [ int(s) for s in re.findall(r'track(\d+)\.(\d)\.raw', file)[0] ]
print('track {} {} '.format(*m), end='', flush=True)
f.write('**TRACK_READ {} {}\n'.format(*m))
stream, stream_pos, index, sck = decode_track(file) # parse KryoFlux raw stream data
track = get_track(stream, stream_pos, index) # Kryoflux stream buffer may contain track data for multiple spins. Extract the data of exact 1 track
scale = sck / fdshield_clk
track = [ int(s/scale) for s in track ] # Downsample
encode(track, f) # Output encoded stream data
f.write('**TRACK_END\n')
count += 1
if __name__ == '__main__':
print('** FryoFlux RAW stream data to FD-Shield bitstream file converter (https://www.kryoflux.com/)')
parser = argparse.ArgumentParser()
parser.add_argument('-i', '--input', type=str, required=True, help='Directory name which contains input KryoFlux RAW bitstream files')
parser.add_argument('--clk_spd', type=int, required=False, default=4e6, help='clock speed for down-sampling (default=4MHz=4000000)')
args = parser.parse_args()
main(args)