samples: sensor: Add simple quadrature decoder demo

# SPDX-License-Identifier: Apache-2.0

cmake_minimum_required(VERSION 3.13.1)

find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})

project(thermometer)

FILE(GLOB app_sources src/*.c)

target_sources(app PRIVATE ${app_sources})

.. _qdec:

QDEC: Quadrature Decoder

###########################

Overview

********

A simple quadrature decoder example

Building and Running

********************

This project writes the quadrature decoder position to the console once every

2 seconds.

Building on SAM E70 Xplained board

==================================

.. zephyr-app-commands::

   :zephyr-app: samples/sensor/qdec

   :host-os: unix

   :board: sam_e70_xplained

   :goals: build

   :compact:

Sample Output

=============

.. code-block:: console

    Quadrature Decoder sample application

    Position is 6

    Position is 12

    Position is -45

    <repeats endlessly every 2 seconds>

CONFIG_QDEC_SAM=y

/*

 * Copyright (c) 2021, Piotr Mienkowski

 *

 * SPDX-License-Identifier: Apache-2.0

 */

&tc0 {

	status = "okay";

	pinctrl-0 = <&pa0b_tc0_tioa0 &pa1b_tc0_tiob0>;

	label = "QDEC_0";

};

CONFIG_SENSOR=y

CONFIG_STDOUT_CONSOLE=y