samples: shields: lmp90100_evb: add rtd sample

.. _shields-lmp90100_evb-samples:

LMP90100 Sensor AFE Evaluation Board Shield Samples

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

.. toctree::

   :maxdepth: 1

   :glob:

   **/*

# SPDX-License-Identifier: Apache-2.0

cmake_minimum_required(VERSION 3.13.1)

# This sample is specific to lmp90100_evb shield. Enforce -DSHIELD option

set(SHIELD lmp90100_evb)

include($ENV{ZEPHYR_BASE}/cmake/app/boilerplate.cmake NO_POLICY_SCOPE)

project(lmp90100_evb_rtd)

FILE(GLOB app_sources src/*.c)

target_sources(app PRIVATE ${app_sources})

.. _lmp90100_evb_rtd_sample:

LMP90100 Sensor AFE Evaluation Board: RTD Sample

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

Overview

********

This sample is provided as an example of how to read the temperature

of a Resistance Temperature Detector (RTD) sensor using the LMP90100

Sensor AFE Evaluation Board shield. The sample is designed for use

with a 3-wire PT100 sensor.

Please refer to :ref:`lmp90100_evb_shield` for more information on

this shield.

Requirements

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

Prior to running the sample application, the LMP90100 EVB must be

connected to the development board according to Example #3 ("3-wire

RTD Application") in the `LMP90100 Sensor AFE Evaluation Board User's

Guide`_.

Building and Running

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

This sample runs with the LMP90100 EVB connected to any development

board with a matching Arduino connector. For this example, we use a

:ref:`frdm_k64f` board.

.. zephyr-app-commands::

   :zephyr-app: samples/shields/lmp90100_evb/rtd

   :board: frdm_k64f

   :goals: build

   :compact:

Sample Output

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

 .. code-block:: console

    R: 111.15 ohm

    T: 28.66 degC

    R: 111.14 ohm

    T: 28.64 degC

    R: 111.14 ohm

    T: 28.63 degC

    R: 111.13 ohm

    T: 28.61 degC

.. _LMP90100 Sensor AFE Evaluation Board User's Guide:

   http://www.ti.com/lit/pdf/snau028

/*

 * Copyright (c) 2019 Vestas Wind Systems A/S

 *

 * SPDX-License-Identifier: Apache-2.0

 */

&lmp90100 {

	rtd-current = <1000>;

};

CONFIG_LOG=y

CONFIG_ADC=y