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from .constants import j1939_industry_groups
class NodeName(object):
def __init__(self, value=0):
self.value = value
@property
def value(self):
retval = self.identity_number
retval += (self.manufacturer_code << 21)
retval += (self.ecu_instance << 32)
retval += (self.function_instance << 35)
retval += (self.function << 40)
retval += (self.reserved_bit << 48)
retval += (self.vehicle_system << 49)
retval += (self.vehicle_system_instance << 56)
retval += (self.industry_group << 60)
retval += (self.arbitrary_address_capable << 63)
return retval
@value.setter
def value(self, value):
"""
Value should be a number between [0, (2 ** 64) - 1]
"""
self.identity_number = value & ((2 ** 21) - 1)
self.manufacturer_code = (value >> 21) & ((2 ** 11) - 1)
self.ecu_instance = (value >> 32) & ((2 ** 3) - 1)
self.function_instance = (value >> 35) & ((2 ** 5) - 1)
self.function = (value >> 40) & ((2 ** 8) - 1)
self.reserved_bit = (value >> 48) & 1
self.vehicle_system = (value >> 49) & ((2 ** 7) - 1)
self.vehicle_system_instance = (value >> 56) & ((2 ** 4) - 1)
self.industry_group = (value >> 60) & ((2 ** 3) - 1)
self.arbitrary_address_capable = (value >> 63) & 1
@property
def arbitrary_address_capable(self):
return self.__arbitrary_address_capable
@arbitrary_address_capable.setter
def arbitrary_address_capable(self, value):
"""Should evaluate to True or False"""
self.__arbitrary_address_capable = bool(value)
@property
def industry_group(self):
return self.__industry_group
@industry_group.setter
def industry_group(self, value):
"""
Value should be in j1939_industry_groups
"""
assert value in j1939_industry_groups
self.__industry_group = value
@property
def vehicle_system_instance(self):
return self.__vehicle_system_instance
@vehicle_system_instance.setter
def vehicle_system_instance(self, value):
"""
An int between 0 and 15.
"""
self.__vehicle_system_instance = value
@property
def vehicle_system(self):
return self.__vehicle_system
@vehicle_system.setter
def vehicle_system(self, value):
"""
An int between 0 and (2 ** 7) - 1.
"""
self.__vehicle_system = value
@property
def reserved_bit(self):
return self.__reserved_bit
@reserved_bit.setter
def reserved_bit(self, value):
self.__reserved_bit = bool(value)
@property
def function(self):
return self.__function
@function.setter
def function(self, value):
"""
An int between 0 and (2 ** 8) - 1
"""
self.__function = value
@property
def function_instance(self):
return self.__function_instance
@function_instance.setter
def function_instance(self, value):
"""
Int between 0 and (2 ** 5) - 1
"""
self.__function_instance = value
@property
def ecu_instance(self):
return self.__ecu_instance
@ecu_instance.setter
def ecu_instance(self, value):
"""
Int between 0 and (2 ** 3) - 1
"""
self.__ecu_instance = value
@property
def manufacturer_code(self):
return self.__manufacturer_code
@manufacturer_code.setter
def manufacturer_code(self, value):
"""
Int between 0 and (2 ** 11) - 1
"""
self.__manufacturer_code = value
@property
def identity_number(self):
return self.__identity_number
@identity_number.setter
def identity_number(self, value):
"""
Int between 0 and (2 ** 21) - 1
"""
self.__identity_number = value
@property
def bytes(self):
return [
(self.value & (0xFF << 56)) >> 56,
(self.value & (0xFF << 48)) >> 48,
(self.value & (0xFF << 40)) >> 40,
(self.value & (0xFF << 32)) >> 32,
(self.value & (0xFF << 24)) >> 24,
(self.value & (0xFF << 16)) >> 16,
(self.value & (0xFF << 8)) >> 8,
(self.value & 0xFF)
]
@bytes.setter
def bytes(self, value):
"""
A list of ints between 0 and (2 ** 8) - 1
"""
# TODO use python's builtin bytes type
self.value = int("".join("%.2X" % _byte for _byte in value), 16)
def __str__(self):
return "%.16X" % self.value
def __repr__(self):
return self.__str__()
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