KS-1Q FEC decoder (prototype)
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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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