Source code for spinnman.messages.spinnaker_boot.spinnaker_boot_message
from spinnman.exceptions import SpinnmanInvalidParameterException
from .spinnaker_boot_op_code import SpinnakerBootOpCode
import struct
BOOT_MESSAGE_VERSION = 1
[docs]class SpinnakerBootMessage(object):
""" A message used for booting the board
"""
def __init__(self, opcode, operand_1, operand_2, operand_3, data=None,
offset=0):
"""
:param opcode: The operation of this packet
:type opcode:\
:py:class:`spinnman.messages.spinnaker_boot.spinnaker_boot_op_code.SpinnakerBootOpCode`
:param operand_1: The first operand
:type operand_1: int
:param operand_2: The second operand
:type operand_2: int
:param operand_3: The third operand
:type operand_3: int
:param data: The optional data, up to 256 words
:type data: str
:param offset: The offset of the valid data
:type offset: int
:raise spinnman.exceptions.SpinnmanInvalidParameterException: If the\
opcode is not a valid value
"""
if data is not None and len(data) > (256 * 4):
raise SpinnmanInvalidParameterException(
"len(data)", str(len(data)),
"A boot packet can contain at most 256 words of data")
self._opcode = opcode
self._operand_1 = operand_1
self._operand_2 = operand_2
self._operand_3 = operand_3
self._data = data
self._offset = offset
@property
def opcode(self):
""" The operation of this packet
:return: The operation code
:rtype:\
:py:class:`spinnman.messages.spinnaker_boot.spinnaker_boot_op_code.SpinnakerBootOpCode`
"""
return self._opcode
@property
def operand_1(self):
""" The first operand
:return: The operand
:rtype: int
"""
return self._operand_1
@property
def operand_2(self):
""" The second operand
:return: The second operand
:rtype: int
"""
return self._operand_2
@property
def operand_3(self):
""" The third operand
:return: The third operand
:rtype: int
"""
return self._operand_3
@property
def data(self):
""" The data
:return: The data or None if no data
:rtype: bytearray
"""
return self._data
@property
def bytestring(self):
""" The message as a bytestring
"""
data = ""
if self._data is not None:
data = self._data[self._offset:]
return struct.pack(
">HIIII", BOOT_MESSAGE_VERSION, self._opcode.value,
self._operand_1, self._operand_2, self._operand_3) + data
[docs] @staticmethod
def from_bytestring(data, offset):
(opcode_value, operand_1, operand_2, operand_3) = struct.unpack_from(
"2xIIII", data, offset)
the_data = None
if len(data) - offset > 0:
the_data = data
return SpinnakerBootMessage(
SpinnakerBootOpCode(opcode_value), operand_1, operand_2, operand_3,
the_data, offset + 18)