.. zephyr:code-sample:: rtk0eg0019b01002bj
   :name: RTK0EG0019B01002BJ Capacitive Touch Application Shield
   :relevant-api: input_interface renesas_ra_ctsu_interface

   Interact with the Capacitive Touch Sensor and LED matrix on the RTK0EG0019B01002BJ shield

Overview
********

This sample demonstrates the usage of the Capacitive Touch Sensor using the
:ref:`rtk0eg0019b01002bj` with `Renesas Capacitive Touch Sensor Solutions`_.

Requirements
************

A Renesas Capacitive Touch Evaluation Kit is needed to run this sample. It includes:

- A MCU board which support CTSU driver (for example: RSSK-RA2L1).
- A RTK0EG0019B01002BJ Touch Application board.

Building and Running
********************

Build and flash with default settings for shield
================================================
The :ref:`rtk0eg0019b01002bj` comes with a default DTS configuration that is tuned in advance to
make it ready for development.

Build and flash as follows, changing ``rssk_ra2l1`` for your board:

.. zephyr-app-commands::
   :zephyr-app: samples/shields/rtk0eg0019b01002bj
   :board: rssk_ra2l1
   :shield: rtk0eg0019b01002bj
   :goals: build flash
   :compact:

After startup, all LEDs on the shield will blink 5 times to indicate that the
application has started.

You can monitor input events through the console output. Additionally, the LED
corresponding to the touched sensor will turn on when you touch it.

.. code-block:: console

    *** Booting Zephyr OS build v4.1.0-6697-gdc27367ff627 ***
    rtk0eg0019b01002bj sample started
    I: input event: dev=button1              type= 1 code= 11 value=0
    I: input event: dev=wheel                type= 3 code=  8 value=61
    I: input event: dev=wheel                type= 3 code=  8 value=67
    I: input event: dev=wheel                type= 3 code=  8 value=82
    I: input event: dev=wheel                type= 3 code=  8 value=111
    I: input event: dev=wheel                type= 3 code=  8 value=124
    I: input event: dev=wheel                type= 3 code=  8 value=134
    I: input event: dev=slider               type= 3 code=  6 value=0
    I: input event: dev=slider               type= 3 code=  6 value=2
    I: input event: dev=slider               type= 3 code=  6 value=4
    I: input event: dev=slider               type= 3 code=  6 value=6
    I: input event: dev=slider               type= 3 code=  6 value=10
    I: input event: dev=slider               type= 3 code=  6 value=23
    I: input event: dev=slider               type= 3 code=  6 value=26
    I: input event: dev=slider               type= 3 code=  6 value=27
    I: input event: dev=slider               type= 3 code=  6 value=28

(Advanced) Using Configuration Output Generated by Renesas QE Capacitive Touch Workflow
=======================================================================================
This section is for advanced users who do not want to use the default configuration for the Cap
Touch shield and would like to tune configuration parameters manually themselves using the
`Renesas Development Assistance Tool for Capacitive Touch Sensors`_.

Requirements
------------

- `e² studio`_ with Renesas QE Capacitive Touch plugin installed: recommended 2025-04.1 version
- `RA Flexible Software Package`_: recommended FSP v5.8.0 or newer

Building and flashing with generated tuning code
------------------------------------------------

 1. Follow steps 6.1 to 6.5 of `Using QE and FSP to Develop Capacitive Touch Applications`_.

 2. At step 8 in 6.5 Tuning the Capacitive Touch Interface Using QE for Capacitive Touch Plug-in,
 select 'Specify an output folder' and choose this application's subfolder.

 3. Update the include path to qe_touch_config.h and qe_touch_define.h, and add qe_touch_config.c
 to the build sources in your application's CMake.

 4. Build and flash the application with the command below:

.. zephyr-app-commands::
   :zephyr-app: samples/shields/rtk0eg0019b01002bj
   :board: rssk_ra2l1
   :shield: rtk0eg0019b01002bj
   :gen-args: -DCONFIG_INPUT_RENESAS_RA_QE_TOUCH_CFG=y
   :goals: build flash
   :compact:

References
**********
- `Renesas Capacitive Touch Sensor Solutions`_
- `Renesas Development Assistance Tool for Capacitive Touch Sensors`_

.. _Renesas Capacitive Touch Sensor Solutions:
   https://www.renesas.com/en/key-technologies/hmi/capacitive-touch-sensor-solutions

.. _Renesas Development Assistance Tool for Capacitive Touch Sensors:
   https://www.renesas.com/en/software-tool/qe-capacitive-touch-development-assistance-tool-capacitive-touch-sensors

.. _Using QE and FSP to Develop Capacitive Touch Applications:
   https://www.renesas.com/en/document/apn/using-qe-and-fsp-develop-capacitive-touch-applications?r=1170071

.. _e² studio:
   https://www.renesas.com/en/software-tool/e-studio

.. _RA Flexible Software Package:
   https://www.renesas.com/en/software-tool/flexible-software-package