Source code for spinnman.messages.eieio.command_messages.eieio_command_header
from spinnman.exceptions import SpinnmanInvalidParameterException
import struct
[docs]class EIEIOCommandHeader(object):
""" EIEIO header for command packets
"""
def __init__(self, command):
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
:param offset: The offset where the valid data starts
:type offset: int
:return: an EIEIO command header
:rtype:\
:py:class:`spinnman.messages.eieio.command_messages.eieio_command_header.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 = struct.unpack_from("<H", data, offset)[0]
command = command_header & 0x3FFF
return EIEIOCommandHeader(command)
@property
def bytestring(self):
""" Get a bytestring of the header
:rtype: str
"""
return struct.pack("<H", 0 << 15 | 1 << 14 | self._command)