Source code for spinnman.messages.scp.impl.read_fpga_register
# 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_utilities.overrides import overrides
from spinnman.messages.scp.abstract_messages import (
AbstractSCPRequest, AbstractSCPResponse, BMPRequest, BMPResponse)
from spinnman.messages.scp.enums import SCPCommand, SCPResult
from spinnman.messages.scp import SCPRequestHeader
from spinnman.exceptions import SpinnmanUnexpectedResponseCodeException
_ONE_WORD = struct.Struct("<I")
[docs]class ReadFPGARegister(BMPRequest):
""" Requests the data from a FPGA's register
"""
__slots__ = []
def __init__(self, fpga_num, register, board):
""" Sets up a read FPGA register request.
:param fpga_num: FPGA number (0, 1 or 2) to communicate with.
:param register: Register address to read to (will be rounded down to\
the nearest 32-bit word boundary).
:param board: which board to request the FPGA register from
:rtype: None
"""
# check to stop people asking for none word aligned memory addresses
# inverses all bits of a value, so is basically a inverse mask for the
# value entered.
arg1 = register & (~0x3)
super(ReadFPGARegister, self).__init__(
board,
SCPRequestHeader(command=SCPCommand.CMD_LINK_READ),
argument_1=arg1, argument_2=4, argument_3=fpga_num)
[docs] @overrides(AbstractSCPRequest.get_scp_response)
def get_scp_response(self):
return _SCPReadFPGARegisterResponse()
class _SCPReadFPGARegisterResponse(BMPResponse):
""" An SCP response to a request for the version of software running
"""
__slots__ = [
"_fpga_register"]
def __init__(self):
super(_SCPReadFPGARegisterResponse, self).__init__()
self._fpga_register = None
@overrides(AbstractSCPResponse.read_data_bytestring)
def read_data_bytestring(self, data, offset):
result = self.scp_response_header.result
if result != SCPResult.RC_OK:
raise SpinnmanUnexpectedResponseCodeException(
"Read FPGA register", "CMD_LINK_READ", result.name)
self._fpga_register = _ONE_WORD.unpack_from(data, offset)[0]
@property
def fpga_register(self):
""" The register information received
:rtype: int
"""
return self._fpga_register