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@daniestevez
Created Nov 20, 2016
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KS-1Q FEC decoder (prototype)
bits = [1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 0, 1, 0, 0, 1, 0, 1, 1, 1, 0, 0, 0, 1, 1, 0, 1, 0, 1, 0, 1, 0, 0, 1, 1, 1, 0, 0, 1, 1, 1, 1, 0, 1, 0, 0, 1, 1, 1, 1, 1, 0, 1, 0, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 0, 0, 1, 1, 1, 1, 1, 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#!/usr/bin/env python2
# needs bbfec from gr-ausat
# and k9aq libfec
from bits import bits
from aausat import fec
import binascii
import ctypes
PACKET_LEN = 256*16
vp = fec.bbfec.create_viterbi(255*8)
ccsds_sequence = ctypes.create_string_buffer(255)
fec.bbfec.ccsds_generate_sequence(ccsds_sequence, 255)
philfec = ctypes.CDLL('libfec.so')
#bits = map(lambda b: b ^ 1, bits)
for i in range(len(bits) - PACKET_LEN):
print 'Starting at bit ', i
h = hex(int(str().join(map(str,bits[i:i+PACKET_LEN])), 2))[2:-1]
if len(h) == 1023:
h = '0' + h
data = binascii.a2b_hex(h)
data_mutable = ctypes.create_string_buffer(data)
fec.bbfec.init_viterbi(vp, 0)
fec.bbfec.update_viterbi(vp, data_mutable, int(255 * 8 + 6))
bit_corr = fec.bbfec.chainback_viterbi(vp, data_mutable, int(255 * 8), int(0))
print 'bit_corr=', bit_corr
# Dual basis CCSDS RS
byte_corr = philfec.decode_rs_ccsds(data_mutable, None, int(0), int(0))
print 'byte_corr=', byte_corr
if byte_corr != -1:
print '************* Succeeded RS decoding *************'
print binascii.b2a_hex(data_mutable[:223])
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