def read_eieio_command_message(data, offset):
""" Reads the content of an EIEIO command message and returns an object\
identifying the command which was contained in the packet, including\
any parameter, if required by the command
:param bytes data: data received from the network as a bytestring
:param int offset: offset at which the parsing operation should start
:return: an object which inherits from EIEIOCommandMessage which contains
parsed data received from the network
:rtype: EIEIOCommandMessage
"""
command_header = EIEIOCommandHeader.from_bytestring(data, offset)
command_number = command_header.command
if command_number == EIEIO_COMMAND_IDS.DATABASE_CONFIRMATION.value:
return DatabaseConfirmation.from_bytestring(command_header, data,
offset + 2)
# Fill in buffer area with padding
elif command_number == EIEIO_COMMAND_IDS.EVENT_PADDING.value:
return PaddingRequest()
# End of all buffers, stop execution
elif command_number == EIEIO_COMMAND_IDS.EVENT_STOP.value:
return EventStopRequest()
# Stop complaining that there is SDRAM free space for buffers
elif command_number == EIEIO_COMMAND_IDS.STOP_SENDING_REQUESTS.value:
return StopRequests()
# Start complaining that there is SDRAM free space for buffers
elif command_number == EIEIO_COMMAND_IDS.START_SENDING_REQUESTS.value:
return StartRequests()
# SpiNNaker requesting new buffers for spike source population
elif command_number == EIEIO_COMMAND_IDS.SPINNAKER_REQUEST_BUFFERS.value:
return SpinnakerRequestBuffers.from_bytestring(command_header, data,
offset + 2)
# Buffers being sent from host to SpiNNaker
elif command_number == EIEIO_COMMAND_IDS.HOST_SEND_SEQUENCED_DATA.value:
return HostSendSequencedData.from_bytestring(command_header, data,
offset + 2)
# Buffers available to be read from a buffered out vertex
elif command_number == EIEIO_COMMAND_IDS.SPINNAKER_REQUEST_READ_DATA.value:
return SpinnakerRequestReadData.from_bytestring(
command_header, data, offset + 2)
# Host confirming data being read form SpiNNaker memory
elif command_number == EIEIO_COMMAND_IDS.HOST_DATA_READ.value:
return HostDataRead.from_bytestring(command_header, data, offset + 2)
return EIEIOCommandMessage(command_header, data, offset + 2)
def _receive_command(self):
return EIEIOCommandHeader.from_bytestring(self.receive(), 0).command
def _send_command(self, command, address):
self.send_to(EIEIOCommandHeader(command.value).bytestring, address)