Source code for spinnman.messages.scp.impl.sdram_de_alloc
from spinnman.messages.scp import SCPRequestHeader
from spinnman.messages.scp.abstract_messages \
import AbstractSCPRequest, AbstractSCPResponse
from spinnman.messages.scp.enums \
import AllocFree, SCPCommand, SCPResult
from spinnman.messages.sdp import SDPFlag, SDPHeader
from spinnman.exceptions import SpinnmanUnexpectedResponseCodeException
import struct
[docs]class SDRAMDeAlloc(AbstractSCPRequest):
""" An SCP Request to free space in the SDRAM
"""
def __init__(self, x, y, app_id, base_address=None):
"""
:param x: The x-coordinate of the chip to allocate on, between 0 and\
255
:type x: int
:param y: The y-coordinate of the chip to allocate on, between 0 and\
255
:type y: int
:param app_id: The id of the application, between 0 and 255
:type app_id: int
:param base_address: The start address in SDRAM to which the block\
needs to be deallocated, or none if deallocating via app_id
:type base_address: int or None
"""
if base_address is not None:
AbstractSCPRequest.__init__(
self,
SDPHeader(
flags=SDPFlag.REPLY_NOT_EXPECTED, destination_port=0,
destination_cpu=0, destination_chip_x=x,
destination_chip_y=y),
SCPRequestHeader(command=SCPCommand.CMD_ALLOC),
argument_1=(
app_id << 8 |
AllocFree.
FREE_SDRAM_BY_POINTER.value), # @UndefinedVariable
argument_2=base_address)
else:
AbstractSCPRequest.__init__(
self,
SDPHeader(
flags=SDPFlag.REPLY_EXPECTED, destination_port=0,
destination_cpu=0, destination_chip_x=x,
destination_chip_y=y),
SCPRequestHeader(command=SCPCommand.CMD_ALLOC),
argument_1=(
app_id << 8 |
AllocFree.
FREE_ROUTING_BY_APP_ID.value)) # @UndefinedVariable
[docs] def get_scp_response(self):
return _SCPSDRAMDeAllocResponse()
class _SCPSDRAMDeAllocResponse(AbstractSCPResponse):
""" An SCP response to a request to deallocate SDRAM
"""
def __init__(self):
"""
"""
AbstractSCPResponse.__init__(self)
self._number_of_blocks_freed = 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(
"SDRAM deallocation", "CMD_DEALLOC", result.name)
self._number_of_blocks_freed = struct.unpack_from(
"<I", data, offset)[0]
# check that the base address is not null (0 in python case) as
# this reflects a issue in command on spinnaker side
if self._number_of_blocks_freed == 0:
raise SpinnmanUnexpectedResponseCodeException(
"SDRAM deallocation response base address", "CMD_DEALLOC",
result.name)
@property
def number_of_blocks_freed(self):
""" The number of allocated blocks that have been freed from the\
app_id given
:rtype: int
"""
return self._number_of_blocks_freed