4b27f5441f
* Rename and extract a bunch of modules into their own files to make it easier to navigate the repository.
* Remove fake versions of `ElixirALE` and `Circuits` from `test/support`.
* Create wrapper modules for `ElixirALE` and `Circuits` modules using `defdelegate` instead.
* Use Elixir 1.10's new `@compile {:no_warn_undefined ...}` directive to inhibit compiler warnings for our optional dependencies.
46 lines
1.3 KiB
Elixir
46 lines
1.3 KiB
Elixir
defmodule WaferAcceptanceCircuits.I2CDeviceTest do
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use ExUnit.Case, async: true
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# Only run acceptance tests if the fake drivers are not loaded.
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if System.get_env("SENSE_HAT_PRESENT") == "true" do
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alias Wafer.Driver.Circuits.I2C, as: Driver
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defmodule HTS221 do
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use Wafer.Registers
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@moduledoc """
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A not very useful driver for the HTS221 humidity sensor on the Pi Sense Hat.
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"""
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defregister(:who_am_i, 0x0F, :ro, 1)
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defregister(:ctrl_reg1, 0x20, :rw, 1)
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def on?(conn) do
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case read_ctrl_reg1(conn) do
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{:ok, <<1::integer-size(1), _::bits>>} -> true
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_ -> false
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end
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end
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def turn_on(conn), do: write_ctrl_reg1(conn, <<1::integer-size(1), 0::integer-size(7)>>)
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def turn_off(conn), do: write_ctrl_reg1(conn, <<0>>)
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end
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describe "generated registers" do
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test "reading" do
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{:ok, conn} = Driver.acquire(bus_name: "i2c-1", address: 0x5F)
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assert {:ok, <<0xBC>>} = HTS221.read_who_am_i(conn)
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end
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test "reading and writing" do
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{:ok, conn} = Driver.acquire(bus_name: "i2c-1", address: 0x5F)
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assert {:ok, conn} = HTS221.turn_on(conn)
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assert HTS221.on?(conn) == true
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assert {:ok, conn} = HTS221.turn_off(conn)
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assert HTS221.on?(conn) == false
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end
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end
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end
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end
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