Source code for spinnman.connections.abstract_classes.abstract_scp_connection
# Copyright (c) 2014 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.
from spinn_utilities.abstract_base import (
AbstractBase, abstractmethod, abstractproperty)
from .connection import Connection
[docs]class AbstractSCPConnection(Connection, metaclass=AbstractBase):
"""
A sender and receiver of SCP messages.
"""
__slots__ = ()
[docs] @abstractmethod
def is_ready_to_receive(self, timeout=0):
"""
Determines if there is an SCP packet to be read without blocking.
:param int timeout:
The time to wait before returning if the connection is not ready
:return: True if there is an SCP packet to be read
:rtype: bool
"""
[docs] @abstractmethod
def receive_scp_response(self, timeout=1.0):
"""
Receives an SCP response from this connection. Blocks
until a message has been received, or a timeout occurs.
:param int timeout:
The time in seconds to wait for the message to arrive; if not
specified, will wait forever, or until the connection is closed
:return: The SCP result, the sequence number, the data of the response
and the offset at which the data starts (i.e., where the SDP
header starts).
:rtype: tuple(SCPResult, int, bytes, int)
:raise SpinnmanIOException:
If there is an error receiving the message
:raise SpinnmanTimeoutException:
If there is a timeout before a message is received
"""
[docs] @abstractmethod
def get_scp_data(self, scp_request):
"""
Returns the data of an SCP request as it would be sent down this
connection.
"""
[docs] @abstractmethod
def send_scp_request(self, scp_request):
"""
Sends an SCP request down this connection.
Messages must have the following properties:
* source_port is `None` or 7
* source_cpu is `None` or 31
* source_chip_x is `None` or 0
* source_chip_y is `None` or 0
tag in the message is optional; if not set, the default set in the
constructor will be used.
sequence in the message is optional; if not set, (sequence number
last assigned + 1) % 65536 will be used
:param AbstractSCPRequest scp_request: message packet to send
:raise SpinnmanIOException:
If there is an error sending the message
"""
@abstractproperty
def chip_x(self):
"""
The X-coordinate of the chip at which messages sent down this
connection will arrive at first.
:rtype: int
"""
@abstractproperty
def chip_y(self):
"""
The Y-coordinate of the chip at which messages sent down this
connection will arrive at first.
:rtype: int
"""