Source code for spinnman.messages.eieio.command_messages.eieio_command_header
# Copyright (c) 2017-2019 The University of Manchester
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import struct
from enum import Enum
from spinnman.exceptions import SpinnmanInvalidParameterException
_ONE_SHORT = struct.Struct("<H")
[docs]class EIEIOCommandHeader(object):
""" EIEIO header for command packets
"""
__slots__ = [
"_command"]
def __init__(self, command):
if isinstance(command, Enum):
command = command.value
if command < 0 or command >= 16384:
raise SpinnmanInvalidParameterException(
"command", command,
"parameter command is outside the allowed range (0 to 16383)")
self._command = command
@property
def command(self):
return self._command
[docs] @staticmethod
def from_bytestring(data, offset):
""" Read an EIEIO command header from a bytestring
:param data: The bytestring to read the data from
:type data: str or bytes
:param offset: The offset where the valid data starts
:type offset: int
:return: an EIEIO command header
:rtype:\
:py:class:`EIEIOCommandHeader`
:raise spinnman.exceptions.SpinnmanIOException: \
If there is an error reading from the reader
:raise spinnman.exceptions.SpinnmanInvalidParameterException: \
If there is an error setting any of the values
"""
command_header = _ONE_SHORT.unpack_from(data, offset)[0]
command = command_header & 0x3FFF
return EIEIOCommandHeader(command)
@property
def bytestring(self):
""" Get a bytestring of the header
:rtype: bytes
"""
return _ONE_SHORT.pack(0 << 15 | 1 << 14 | self._command)