def test_crc(self):
# http://depa.usst.edu.cn/chenjq/www2/software/crc/CRC_Javascript/CRCcalculation.htm
# CRC-16: polynomial="16_standard", start_value = False, final_xor = False, reverse_polynomial=False, reverse_all=False
# CRC-16-CCITT: polynomial="16_ccitt", start_value = False, final_xor = False, reverse_polynomial=False, reverse_all=False
# http://www.lammertbies.nl/comm/info/crc-calculation.html <- Fehler
# CRC-16: polynomial="16_standard", start_value = False, final_xor = False, reverse_polynomial=False, reverse_all=False
c = crc_generic(polynomial="8_en")
e = Encoder()
bitstr = [
"010101010110100111011010111011101110111011100110001011101010001011101110110110101101",
"010101010110101001101110111011101110111011100110001011101010001011101110110111100101",
"010101010110100111010010111011101110111011100110001011101010001011101110110110100101"
]
expected = ["0x78", "0xc9", "0xf2"]
for value, expect in zip(bitstr, expected):
nv = ""
for i in range(0, len(value)):
if value[i] == "1":
nv += "0"
else:
nv += "1"
self.assertEqual(e.bit2hex(c.crc(e.str2bit(value[4:-8]))), expect)
def test_reverse_engineering(self):
c = crc_generic(polynomial="16_standard",
start_value=False,
final_xor=False,
reverse_polynomial=False,
reverse_all=False,
lsb_first=False,
little_endian=False)
bitstring_set = [
"1110001111001011100010000101010100000010110111000101100010100100111110111101100110110111011001010010001011101010",
"1110010011001011100010000101010100000010110111000101100010100100111110111101100110110111011001010010001011101010",
"1110010111001011100010000101010100000010110111000101100010100100111110111101100110110111011001010010001011101010",
"1110011011001011100010000101010100000010110111000101100010100100111110111101100110110111011001010010001011101010"
]
bitset = []
crcset = []
for i in bitstring_set:
tmp = c.str2bit(i)
bitset.append(tmp)
crcset.append(c.crc(tmp))
# print(c.guess_standard_parameters(bitset[0], crcset[0]))
polynomial = c.reverse_engineer_polynomial(bitset, crcset)
if polynomial:
self.assertEqual(c.bit2str(polynomial), "1000000000000101")
self.assertEqual(c.bit2hex(polynomial), "0x8005")
def __init__(self, chain=None):
if chain is None:
chain = []
self.mode = 0
self.external_decoder = ""
self.external_encoder = ""
self.multiple = 1
self.src = [
] # [[True, True], [True, False], [False, True], [False, False]]
self.dst = [
] # [[False, False], [False, True], [True, False], [True, True]]
self.carrier = "1_"
self.cutmark = array.array("B", [True, False])
self.cutmode = 0 # 0 = before, 1 = after, 2 = before_pos, 3 = after_pos
self.morse_low = 1
self.morse_high = 3
self.morse_wait = 1
self.__symbol_len = 1
# Configure CC1101 Date Whitening
polynomial = array.array(
"B",
[False, False, True, False, False, False, False, True]) # x^5+x^0
sync_bytes = array.array("B", [
True, True, True, False, True, False, False, True, True, True,
False, False, True, False, True, False, True, True, True, False,
True, False, False, True, True, True, False, False, True, False,
True, False
]) # "e9cae9ca"
# sync_bytes = self.str2bit("01100111011010000110011101101000") # "67686768" (RWE Default)
# sync_bytes = self.str2bit("01101001111101100110100111110111") # "69f669f7" (Special RWE)
self.data_whitening_polynomial = polynomial # Set polynomial
self.data_whitening_sync = sync_bytes # Sync Bytes
self.data_whitening_crc = array.array("B", [False] *
16) # CRC is 16 Bit long
self.data_whitening_preamble = array.array("B", [True, False] *
16) # 010101...
self.lfsr_state = array.array("B", [])
self.data_whitening_apply_crc = True # Apply CRC with XOR
self.data_whitening_preamble_rm = True # Remove Preamble
self.data_whitening_sync_rm = True # Remove Sync Bytes
self.data_whitening_crc_rm = False # Remove CRC
# Get CRC Object
self.c = crc_generic(polynomial="16_standard", start_value=True)
# Set Chain
self.chain = []
self.set_chain(chain)
def test_crc(self):
c = crc_generic(polynomial="8_en")
e = Encoder()
bitstr = [
"010101010110100111011010111011101110111011100110001011101010001011101110110110101101",
"010101010110101001101110111011101110111011100110001011101010001011101110110111100101",
"010101010110100111010010111011101110111011100110001011101010001011101110110110100101"
]
print()
for v in bitstr:
nv = ""
for i in range(0, len(v)):
if v[i] == "1":
nv += "0"
else:
nv += "1"
xorsum = 0
for i in range(12, len(v) - 8, 4):
bin = e.str2bit(v[0 + i:4 + i])
xorsum ^= (bin[0] * 8 + bin[1] * 4 + bin[2] * 2 + bin[3])
print(e.bit2hex(e.str2bit(v[1:])), hex(xorsum))
def enocean_crc8(inpt):
c = crc_generic(polynomial="8_en")
return c.crc(inpt)
def enocean_crc8(inpt):
c = crc_generic(polynomial="8_en")
return array.array("B", c.crc(inpt))
