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samples: boards: renesas: Add comparator sample for Renesas
Add comparator sample for Renesas boards Signed-off-by: Khoa Nguyen <khoa.nguyen.xh@renesas.com>
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‎MAINTAINERS.yml

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- dts/arm/renesas/ra/
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- dts/bindings/*/*renesas,ra*
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- soc/renesas/ra/
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- samples/boards/renesas/
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labels:
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- "platform: Renesas RA"
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description: >-

‎samples/boards/renesas/comparator/CMakeLists.txt

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# Copyright (c) 2025 Renesas Electronics Corporation
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# SPDX-License-Identifier: Apache-2.0
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cmake_minimum_required(VERSION 3.20.0)
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find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
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project(renesas_comparator)
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FILE(GLOB app_sources src/*.c)
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target_sources(app PRIVATE ${app_sources})

‎samples/boards/renesas/comparator/Kconfig

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# Copyright (c) 2025 Renesas Electronics Corporation
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# SPDX-License-Identifier: Apache-2.0
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mainmenu "Comparator sample additional options"
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source "Kconfig.zephyr"
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ZEPHYR_USER := zephyr,user
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config DAC_REFERENCE_SOURCE
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bool
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select DAC
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default y if $(dt_node_has_prop,/$(ZEPHYR_USER),vref-dac)

‎samples/boards/renesas/comparator/README.rst

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.. zephyr:code-sample:: renesas_comparator
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:name: Renesas comparator
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Monitor the output of comparator.
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Overview
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********
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A sample that help to monitor the output of comparator.
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Hardware Setup
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**************
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* The IVREF is connected to the internal output of DA0 (DAC module).
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By default, DA0 is set to ~1.75V (half of the full-scale voltage).
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* For IVCOMP, the user can connect the IVCMP3 input to either:
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* Case 1: IVCMP3 with SW0 (button on board, on ek_ra8m1 is P600).
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* Case 2: IVCMP3 with external voltage for comparison.
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Building and Running
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********************
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This application can be built and executed on RA boards as follows:
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.. zephyr-app-commands::
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:zephyr-app: samples/boards/renesas/comparator
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:board: ek_ra8m1
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:goals: build flash
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:compact:
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The comparator's output controls LED0:
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* If the comparator output is HIGH, LED0 turns on.
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* If the comparator output is LOW, LED0 turns off.
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Example case:
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* Case 1: IVCMP3 connected to SW0 (Pull up)
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* SW0 not pressed --> Comparator output HIGH --> LED0 on
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* SW0 pressed --> Comparator output LOW --> LED0 off
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* Case 2: IVCMP3 connected to another reference voltage
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* IVCMP3 HIGH --> Comparator output HIGH --> LED0 on
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* IVCMP3 LOW --> Comparator output LOW --> LED0 off

‎samples/boards/renesas/comparator/boards/ek_ra8d1.overlay

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/*
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* Copyright (c) 2025 Renesas Electronics Corporation
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <zephyr/dt-bindings/gpio/gpio.h>
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/ {
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aliases {
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sample-comp = &acmphs0;
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};
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zephyr,user {
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vref-dac = <&dac0>;
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};
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};
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&acmphs_global {
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status = "okay";
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acmphs0 {
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/*
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* Since ivref3 is internally routed from to DA0 (DAC),
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* there is no need to add pinsel of ivref3.
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*/
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pinctrl-0 = <&acmphs0_ivcmp3>;
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pinctrl-names = "default";
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interrupts = <90 12>;
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interrupt-names = "hs";
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reference-input-source = "ivref3";
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compare-input-source = "ivcmp3";
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status = "okay";
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};
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};

‎samples/boards/renesas/comparator/boards/ek_ra8m1.overlay

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/*
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* Copyright (c) 2025 Renesas Electronics Corporation
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* SPDX-License-Identifier: Apache-2.0
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*/
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/ {
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aliases {
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sample-comp = &acmphs0;
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};
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zephyr,user {
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vref-dac = <&dac0>;
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};
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};
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&acmphs_global {
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status = "okay";
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acmphs0 {
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/*
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* Since ivref3 is internally routed from to DA0 (DAC),
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* there is no need to add pinsel of ivref3.
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*/
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pinctrl-0 = <&acmphs0_ivcmp3>;
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pinctrl-names = "default";
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interrupts = <90 12>;
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interrupt-names = "hs";
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reference-input-source = "ivref3";
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compare-input-source = "ivcmp3";
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status = "okay";
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};
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};

‎samples/boards/renesas/comparator/prj.conf

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# Copyright (c) 2025 Renesas Electronics Corporation
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# SPDX-License-Identifier: Apache-2.0
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CONFIG_GPIO=y
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CONFIG_COMPARATOR=y

‎samples/boards/renesas/comparator/sample.yaml

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sample:
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name: Comparator
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tests:
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sample.boards.renesas.comparator:
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build_only: true
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platform_allow:
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- ek_ra8m1
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- ek_ra8d1
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tags: comparator

‎samples/boards/renesas/comparator/src/main.c

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/*
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* Copyright (c) 2025 Renesas Electronics Corporation
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <zephyr/kernel.h>
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#include <zephyr/device.h>
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#include <zephyr/drivers/comparator.h>
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#include <zephyr/drivers/gpio.h>
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#include <zephyr/kernel.h>
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#include <zephyr/sys/util.h>
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#include <zephyr/sys/printk.h>
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#ifdef CONFIG_DAC_REFERENCE_SOURCE
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#include <zephyr/drivers/dac.h>
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#endif
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/*
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* Get button configuration from the devicetree sw0 alias. This is mandatory.
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*/
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#define SW0_NODE DT_ALIAS(sw0)
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#if !DT_NODE_HAS_STATUS_OKAY(SW0_NODE)
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#error "Unsupported board: sw0 devicetree alias is not defined"
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#endif
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static const struct gpio_dt_spec button = GPIO_DT_SPEC_GET_OR(SW0_NODE, gpios, {0});
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static struct gpio_dt_spec led = GPIO_DT_SPEC_GET_OR(DT_ALIAS(led0), gpios, {0});
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static const struct device *comp_dev = DEVICE_DT_GET(DT_ALIAS(sample_comp));
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#ifdef CONFIG_DAC_REFERENCE_SOURCE
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static const struct dac_channel_cfg dac_ch_cfg = {
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.channel_id = 0,
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.resolution = 12,
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.buffered = true,
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};
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static const struct device *init_dac(void)
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{
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int ret;
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const struct device *const dac_dev = DEVICE_DT_GET(DT_PROP(DT_PATH(zephyr_user), vref_dac));
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ret = device_is_ready(dac_dev);
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if (ret != true) {
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printk("DAC device is not ready\n");
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return NULL;
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}
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ret = dac_channel_setup(dac_dev, &dac_ch_cfg);
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if (ret != 0) {
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printk("Setting up of the first channel failed with code %d\n", ret);
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return NULL;
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}
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return dac_dev;
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}
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#endif
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static void comp_callback(const struct device *dev, void *user_data)
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{
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int val = comparator_get_output(comp_dev);
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gpio_pin_set_dt(&led, val);
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printk("Comparator output value %d\n", val);
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}
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int main(void)
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{
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int ret;
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#ifdef CONFIG_DAC_REFERENCE_SOURCE
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const struct device *dac_dev = init_dac();
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if (dac_dev == NULL) {
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printk("Init_dac failed\n");
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return 0;
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}
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/* write a value of half the full scale resolution */
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ret = dac_write_value(dac_dev, dac_ch_cfg.channel_id, (1U << dac_ch_cfg.resolution) / 2);
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if (ret != 0) {
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printk("dac_write_value() failed with code %d", ret);
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return 0;
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}
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#endif
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if (!gpio_is_ready_dt(&button)) {
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printk("Error: button device %s is not ready\n", button.port->name);
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return 0;
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}
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ret = gpio_pin_configure_dt(&button, GPIO_INPUT);
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if (ret != 0) {
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printk("Error %d: failed to configure %s pin %d\n", ret, button.port->name,
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button.pin);
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return 0;
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}
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if (led.port && !gpio_is_ready_dt(&led)) {
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printk("Error %d: LED device %s is not ready; ignoring it\n", ret, led.port->name);
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led.port = NULL;
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}
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if (led.port) {
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ret = gpio_pin_configure_dt(&led, GPIO_OUTPUT);
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if (ret != 0) {
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printk("Error %d: failed to configure LED device %s pin %d\n", ret,
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led.port->name, led.pin);
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led.port = NULL;
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}
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}
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comparator_set_trigger(comp_dev, COMPARATOR_TRIGGER_BOTH_EDGES);
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comparator_set_trigger_callback(comp_dev, comp_callback, NULL);
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printk("Press the button\n");
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return 0;
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}

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