Source code for spinnman.messages.sdp.sdp_header
import struct
from .sdp_flag import SDPFlag
N_BYTES = 8
[docs]class SDPHeader(object):
""" Represents the header of an SDP message.
Each optional parameter in the constructor can be set to a value other\
than None once, after which it is immutable. It is an error to set a\
parameter that is not currently None.
"""
def __init__(self, flags=None, tag=None,
destination_port=None, destination_cpu=None,
destination_chip_x=None, destination_chip_y=None,
source_port=None, source_cpu=None,
source_chip_x=None, source_chip_y=None):
"""
:param flags: Any flags for the packet
:type flags: :py:class:`spinnman.messages.sdp.sdp_flag.SDPFlag`
:param tag: The ip tag of the packet between 0 and 255, or None if it\
is to be set later
:type tag: int
:param destination_port: The destination port of the packet between 0\
and 7
:type destination_port: int
:param destination_cpu: The destination processor id within the chip\
between 0 and 31
:type destination_cpu: int
:param destination_chip_x: The x-coordinate of the destination chip\
between 0 and 255
:type destination_chip_x: int
:param destination_chip_y: The y-coordinate of the destination chip\
between 0 and 255
:type destination_chip_y: int
:param source_port: The source port of the packet between 0 and 7, or\
None if it is to be set later
:type source_port: int
:param source_cpu: The source processor id within the chip\
between 0 and 31, or None if it is to be set later
:type source_cpu: int
:param source_chip_x: The x-coordinate of the source chip\
between 0 and 255, or None if it is to be set later
:type source_chip_x: int
:param source_chip_y: The y-coordinate of the source chip\
between 0 and 255, or None if it is to be set later
"""
self._flags = flags
self._tag = tag
self._destination_port = destination_port
self._destination_cpu = destination_cpu
self._destination_chip_x = destination_chip_x
self._destination_chip_y = destination_chip_y
self._source_port = source_port
self._source_cpu = source_cpu
self._source_chip_x = source_chip_x
self._source_chip_y = source_chip_y
@property
def flags(self):
""" The flags of the packet
:return: The flags of the packet
:rtype: :py:class:`spinnman.messages.sdp.sdp_flag.SDPFlag`
"""
return self._flags
@flags.setter
def flags(self, flags):
""" Set the flags of the packet
:param flags: The flags to set
:type flags: :py:class:`spinnman.messages.sdp.sdp_flag.SDPFlag`
"""
self._flags = flags
@property
def tag(self):
""" The tag of the packet
:return: The tag of the packet between 0 and 255
:rtype: int
"""
return self._tag
@tag.setter
def tag(self, tag):
""" Set the tag of the packet
:param tag: The tag to set, between 0 and 255
:type tag: int
"""
self._tag = tag
@property
def destination_port(self):
""" The destination port of the packet
:return: The destination port of the packet between 0 and 7
:rtype: int
"""
return self._destination_port
@destination_port.setter
def destination_port(self, destination_port):
""" Set the destination port of the packet
:param destination_port: The destination port to set, between 0 and 7
:type destination_port: int
"""
self._destination_port = destination_port
@property
def destination_cpu(self):
""" The core on the destination chip
:return: The core on the destination chip, between 0 and 31
:rtype: int
"""
return self._destination_cpu
@destination_cpu.setter
def destination_cpu(self, destination_cpu):
""" Set the id of the destination processor of the packet
:param destination_cpu: The processor id to set, between 0 and 31
:type destination_cpu: int
"""
self._destination_cpu = destination_cpu
@property
def destination_chip_x(self):
""" The x-coordinate of the destination chip of the packet
:return: The x-coordinate of the chip, between 0 and 255
:rtype: int
"""
return self._destination_chip_x
@destination_chip_x.setter
def destination_chip_x(self, destination_chip_x):
""" Set the x-coordinate of the destination chip of the packet
:param destination_chip_x: The x-coordinate to set, between 0 and 255
:type destination_chip_x: int
"""
self._destination_chip_x = destination_chip_x
@property
def destination_chip_y(self):
""" The y-coordinate of the destination chip of the packet
:return: The y-coordinate of the chip, between 0 and 255
:rtype: int
"""
return self._destination_chip_y
@destination_chip_y.setter
def destination_chip_y(self, destination_chip_y):
""" Set the y-coordinate of the destination chip of the packet
:param destination_chip_y: The y-coordinate to set, between 0 and 255
:type destination_chip_y: int
"""
self._destination_chip_y = destination_chip_y
@property
def source_port(self):
""" The source port of the packet
:return: The source port of the packet between 0 and 7
:rtype: int
"""
return self._source_port
@source_port.setter
def source_port(self, source_port):
""" Set the source port of the packet
:param source_port: The source port to set, between 0 and 7
:type source_port: int
"""
self._source_port = source_port
@property
def source_cpu(self):
""" The core on the source chip
:return: The core on the source chip, between 0 and 31
:rtype: int
"""
return self._source_cpu
@source_cpu.setter
def source_cpu(self, source_cpu):
""" Set the id of the source processor of the packet
:param source_cpu: The processor id to set, between 0 and 31
:type source_cpu: int
"""
self._source_cpu = source_cpu
@property
def source_chip_x(self):
""" The x-coordinate of the source chip of the packet
:return: The x-coordinate of the chip, between 0 and 255
:rtype: int
"""
return self._source_chip_x
@source_chip_x.setter
def source_chip_x(self, source_chip_x):
""" Set the x-coordinate of the source chip of the packet
:param source_chip_x: The x-coordinate to set, between 0 and 255
:type source_chip_x: int
"""
self._source_chip_x = source_chip_x
@property
def source_chip_y(self):
""" The y-coordinate of the source chip of the packet
:return: The y-coordinate of the chip, between 0 and 255
:rtype: int
"""
return self._source_chip_y
@source_chip_y.setter
def source_chip_y(self, source_chip_y):
""" Set the y-coordinate of the source chip of the packet
:param source_chip_y: The y-coordinate to set, between 0 and 255
:type source_chip_y: int
"""
self._source_chip_y = source_chip_y
@property
def bytestring(self):
""" The header as a bytestring
:return: The header bytestring
:rtype: str
"""
dest_port_cpu = (((self._destination_port & 0x7) << 5) |
(self._destination_cpu & 0x1F))
source_port_cpu = (((self._source_port & 0x7) << 5) |
(self._source_cpu & 0x1F))
return struct.pack(
"<8B", self._flags.value, self._tag, dest_port_cpu,
source_port_cpu, self._destination_chip_y,
self._destination_chip_x, self._source_chip_y, self._source_chip_x)
[docs] @staticmethod
def from_bytestring(data, offset):
""" Read the header from a bytestring
:param data: The bytestring to read the header from
:type data: str
:param offset: The offset into the data from which to start reading
:type offset: int
"""
(flags, tag, dest_port_cpu, source_port_cpu,
destination_chip_y, destination_chip_x,
source_chip_y, source_chip_x) = struct.unpack_from(
"<8B", data, offset)
destination_port = dest_port_cpu >> 5
destination_cpu = dest_port_cpu & 0x1F
source_port = source_port_cpu >> 5
source_cpu = source_port_cpu & 0x1F
return SDPHeader(
SDPFlag(flags), tag, destination_port, destination_cpu,
destination_chip_x, destination_chip_y, source_port, source_cpu,
source_chip_x, source_chip_y)