Source code for spinnman.processes.load_routes_process

# 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 spinn_machine import Router
from spinnman.exceptions import SpinnmanInvalidParameterException
from spinnman.messages.scp.impl import RouterInit, RouterAlloc
from .abstract_multi_connection_process import AbstractMultiConnectionProcess
from .write_memory_process import WriteMemoryProcess

_ROUTE_PATTERN = struct.Struct("<H2xIII")
_END_PATTERN = struct.Struct("<IIII")
_TABLE_ADDRESS = 0x67800000


[docs]class LoadMultiCastRoutesProcess(AbstractMultiConnectionProcess): """ A process for loading the multicast routing table on a SpiNNaker\ chip. """ __slots__ = [ "_base_address"] def __init__(self, connection_selector): """ :param connection_selector: :type connection_selector: AbstractMultiConnectionProcessConnectionSelector """ super().__init__(connection_selector) self._base_address = None def __handle_router_alloc_response(self, response): self._base_address = response.base_address
[docs] def load_routes(self, x, y, routes, app_id): """ :param int x: :param int y: :param list(~spinn_machine.MulticastRoutingEntry) routes: :param int app_id: """ # Create the routing data - 16 bytes per entry plus one for the end # entry routing_data = bytearray(16 * (len(routes) + 1)) n_entries = 0 for route in routes: route_entry = \ Router.convert_routing_table_entry_to_spinnaker_route(route) _ROUTE_PATTERN.pack_into( routing_data, n_entries * 16, n_entries, route_entry, route.routing_entry_key, route.mask) n_entries += 1 # Add an entry to mark the end _END_PATTERN.pack_into( routing_data, n_entries * 16, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF) # Upload the data process = WriteMemoryProcess(self._conn_selector) process.write_memory_from_bytearray( x, y, 0, _TABLE_ADDRESS, routing_data, 0, len(routing_data)) # Allocate space in the router table self._send_request(RouterAlloc(x, y, app_id, n_entries), self.__handle_router_alloc_response) self._finish() self.check_for_error() if self._base_address == 0: raise SpinnmanInvalidParameterException( "Allocation base address", str(self._base_address), "Not enough space to allocate the entries") # Load the entries self._send_request( RouterInit( x, y, n_entries, _TABLE_ADDRESS, self._base_address, app_id)) self._finish() self.check_for_error()