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lib/spi/nil_backend.ex
# SPDX-FileCopyrightText: 2023 Frank Hunleth
#
# SPDX-License-Identifier: Apache-2.0
defmodule Circuits.SPI.NilBackend do
@moduledoc """
Circuits.SPI backend when nothing else is available
"""
@behaviour Circuits.SPI.Backend
alias Circuits.SPI.Backend
@doc """
Return the SPI bus names on this system
No supported options
"""
@impl Backend
def bus_names(_options), do: []
@doc """
Open an SPI bus
No supported options.
"""
@impl Backend
def open(_bus_name, _options) do
{:error, :unimplemented}
end
@doc """
Return information about this backend
"""
@impl Backend
def info() do
%{name: __MODULE__}
end
end