def calc_CRC(self, data_packet):
crc = 0x1D0F
for byte_c in data_packet:
crc ^= uint16(ord(byte_c) << 8).value
for _ in range(8):
if crc & 0x8000:
crc = uint16((crc << 1) ^ 0x1021).value
else:
crc = uint16(crc << 1).value
return crc
def parse(token):
if is_signal(token):
return uint16(int(token)).value
elif is_wire(token):
loop_check(token)
if token not in computed:
computed[token] = parse(sym_tab[token])
loop_clear(token)
return computed[token]
else:
m = re.match(not_re, token)
if m is not None:
return not_op(m.groupdict()['val'])
else:
for x in two_arg_ops:
m = re.match(x['re'], token)
if m is not None:
return x['op'](m.groupdict()['lhs'], m.groupdict()['rhs'])
print "parse error token %s" % token
return None
def not_op(x):
return uint16(~parse(x)).value
def rshift_op(x, y):
return uint16(parse(x) >> parse(y)).value
def lshift_op(x, y):
return uint16(parse(x) << parse(y)).value
def or_op(x, y):
return uint16(parse(x) | parse(y)).value
def and_op(x, y):
return uint16(parse(x) & parse(y)).value