Source code for spinnman.processes.read_memory_process
# Copyright (c) 2015 The University of Manchester
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import functools
from typing import Callable
from spinn_utilities.typing.coords import XYP
from spinnman.messages.scp.impl import ReadLink, ReadMemory
from spinnman.messages.scp.impl.read_memory import Response
from spinnman.constants import UDP_MESSAGE_MAX_SIZE
from spinnman.messages.scp.abstract_messages import AbstractSCPRequest
from .abstract_multi_connection_process import AbstractMultiConnectionProcess
from .abstract_multi_connection_process_connection_selector import (
ConnectionSelector)
class ReadMemoryProcess(AbstractMultiConnectionProcess[Response]):
"""
A process for reading memory on a SpiNNaker chip.
"""
__slots__ = ("_view", )
def __init__(self, connection_selector: ConnectionSelector):
"""
:param ConnectionSelector connection_selector:
"""
super().__init__(connection_selector)
self._view = memoryview(b'')
def __handle_response(self, offset: int, response: Response):
self._view[offset:offset + response.length] = response.data[
response.offset:response.offset + response.length]
[docs]
def read_memory(self, coordinates: XYP, base_address: int,
length: int) -> bytearray:
"""
Read some memory from a core.
:param tuple(int,int,int) coordinates:
:param int base_address:
:param int length:
:rtype: bytearray
"""
return self._read_memory(
base_address, length,
functools.partial(ReadMemory, coordinates))
[docs]
def read_link_memory(self, coordinates: XYP, link: int,
base_address: int, length: int) -> bytearray:
"""
Read some memory from the neighbour of a core.
:param tuple(int,int,int) coordinates:
:param int link:
:param int base_address:
:param int length:
:rtype: bytearray
"""
return self._read_memory(
base_address, length,
functools.partial(ReadLink, coordinates, link))
def _read_memory(
self, base_address: int, length: int,
packet_class: Callable[
[int, int], AbstractSCPRequest[Response]]) -> bytearray:
data = bytearray(length)
self._view = memoryview(data)
n_bytes = length
offset = 0
with self._collect_responses():
while n_bytes > 0:
bytes_to_get = min((n_bytes, UDP_MESSAGE_MAX_SIZE))
self._send_request(
packet_class(base_address + offset, bytes_to_get),
functools.partial(self.__handle_response, offset))
n_bytes -= bytes_to_get
offset += bytes_to_get
return data