Source code for spinnman.messages.scp.impl.read_fpga_register
"""
ReadFPGARegister
"""
# spinnman imports
from spinnman.messages.scp.abstract_messages \
import BMPRequest, BMPResponse
from spinnman.messages.scp.enums import SCPCommand, SCPResult
from spinnman.messages.scp import SCPRequestHeader
from spinnman.exceptions import SpinnmanUnexpectedResponseCodeException
import struct
[docs]class ReadFPGARegister(BMPRequest):
""" Requests the data from a fpga's register
"""
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)
BMPRequest.__init__(
self, board,
SCPRequestHeader(command=SCPCommand.CMD_LINK_READ),
argument_1=arg1, argument_2=4, argument_3=fpga_num)
[docs] def get_scp_response(self):
return _SCPReadFPGARegisterResponse()
class _SCPReadFPGARegisterResponse(BMPResponse):
""" An SCP response to a request for the version of software running
"""
def __init__(self):
"""
"""
BMPResponse.__init__(self)
self._fpga_register = None
def read_data_bytestring(self, data, offset):
""" See\
:py:meth:`spinnman.messages.scp.abstract_scp_response.AbstractSCPResponse.read_data_bytestring`
"""
result = self.scp_response_header.result
if result != SCPResult.RC_OK:
raise SpinnmanUnexpectedResponseCodeException(
"Read FPGA register", "CMD_LINK_READ", result.name)
self._fpga_register = struct.unpack_from("<I", data, offset)[0]
@property
def fpga_register(self):
""" The register information received
:rtype: int
"""
return self._fpga_register