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# -*- coding: utf-8 -*-
#
# Abstract spidev module interface implementation
#
# Copyright 2018 Michael Buesch <m@bues.ch>
#
# 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/>.
class Abstract_SpiDev(object):
__slots__ = (
"mode",
"bits_per_word",
"max_speed_hz",
"_bus",
"_device",
"_opened",
)
def __init__(self, bus=-1, client=-1):
self.mode = 0
self.bits_per_word = 0
self.max_speed_hz = 0
self._opened = -1
if bus >= 0:
self.open(bus, client)
@property
def cshigh(self):
raise NotImplementedError
@cshigh.setter
def cshigh(self, cshigh):
raise NotImplementedError
@property
def threewire(self):
raise NotImplementedError
@threewire.setter
def threewire(self, threewire):
raise NotImplementedError
@property
def lsbfirst(self):
raise NotImplementedError
@lsbfirst.setter
def lsbfirst(self, lsbfirst):
raise NotImplementedError
@property
def loop(self):
raise NotImplementedError
@loop.setter
def loop(self, loop):
raise NotImplementedError
@property
def no_cs(self):
raise NotImplementedError
@no_cs.setter
def no_cs(self, no_cs):
raise NotImplementedError
def open(self, bus, device):
assert(bus >= 0)
assert(device >= 0)
self._bus = bus
self._device = device
self._opened = 42
def close(self):
if self._opened >= 0:
self._opened = -1
def fileno(self):
raise NotImplementedError
def readbytes(self, length):
raise NotImplementedError
def writebytes(self, data):
raise NotImplementedError
def xfer(self, data, speed_hz=0, delay_usecs=0, bits_per_word=0):
raise NotImplementedError
def xfer2(self, data, speed_hz=0, delay_usecs=0, bits_per_word=0):
raise NotImplementedError
def __enter__(self):
pass
def __exit__(self, exc_type, exc_value, traceback):
self.close()
return False
|
