samples: sensor: paj7620_gesture: added sample

Added a sample for using the PAJ7620 gesture sensor

Signed-off-by: Paul Timke Contreras <ptimkec@live.com>

samples/sensor/paj7620_gesture/CMakeLists.txt

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+# Copyright (c) 2025 Paul Timke <ptimkec@live.com>
+# SPDX-License-Identifier: Apache-2.0
+
+cmake_minimum_required(VERSION 3.20.0)
+find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
+project(paj7620_gesture)
+
+FILE(GLOB app_sources src/*.c)
+target_sources(app PRIVATE ${app_sources})

samples/sensor/paj7620_gesture/Kconfig

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+# Copyright (c) 2025 Paul Timke <ptimkec@live.com>
+# SPDX-License-Identifier: Apache-2.0
+
+mainmenu "PAJ7620 sample application"
+
+config APP_USE_POLLING
+	bool "Select y to use polling, otherwise the sample will use triggers"
+	default y
+
+source "Kconfig.zephyr"

samples/sensor/paj7620_gesture/README.rst

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+.. zephyr:code-sample:: paj7620_gesture
+   :name: PAJ7620 Gesture Sensor
+   :relevant-api: sensor_interface
+
+   Get hand gesture data from PAJ7620 sensor.
+
+Overview
+********
+
+This sample application gets the output of a gesture sensor (paj7620) using either polling or
+triggers (depending on CONFIG_APP_USE_POLLING) and outputs the corresponding gesture to the
+console, each time one is detected.
+
+Requirements
+************
+
+To use this sample, the following hardware is required:
+
+* A board with I2C support and GPIO to detect external interrutps
+* PAJ7620 sensor
+
+Building and Running
+********************
+
+This sample outputs data to the console. It requires a PAJ7620 sensor.
+
+.. zephyr-app-commands::
+   :zephyr-app: samples/sensor/paj7620_gesture
+   :board: nucleo_f334r8
+   :goals: build
+   :compact:
+
+Sample Output
+=============
+
+.. code-block:: console
+
+   Gesture LEFT
+   Gesture RIGHT
+   Gesture UP
+   Gesture DOWN

samples/sensor/paj7620_gesture/boards/nucleo_f334r8.overlay

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+&gpioa {
+	status = "okay";
+};
+
+&i2c1 {
+	status = "okay";
+
+	paj7620: paj7620@73 {
+		compatible = "pixart,paj7620";
+		reg = <0x73>;
+		int-gpios = <&gpioa 9 (GPIO_PULL_UP)>;
+	};
+};

samples/sensor/paj7620_gesture/prj.conf

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+CONFIG_GPIO=y
+CONFIG_STDOUT_CONSOLE=y
+CONFIG_I2C=y
+CONFIG_SENSOR=y
+CONFIG_PAJ7620_TRIGGER_OWN_THREAD=y

samples/sensor/paj7620_gesture/sample.yaml

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+sample:
+  name: PAJ7620 gesture trigger sample
+tests:
+  sample.sensor.paj7620_gesture_trig:
+    build_only: true
+    tags: sensors
+    platform_allow: nucleo_f334r8
+    depends_on:
+      - i2c
+      - gpio
+    filter: dt_compat_enabled("pixart,paj7620")
+  sample.sensor.paj7620_gesture_polling:
+    build_only: true
+    tags: sensors
+    platform_allow: nucleo_f334r8
+    depends_on: i2c
+    filter: dt_compat_enabled("pixart,paj7620")

samples/sensor/paj7620_gesture/src/main.c

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+/*
+ * Copyright (c) 2025 Paul Timke <ptimkec@live.com>
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr/kernel.h>
+#include <zephyr/drivers/sensor.h>
+#include <zephyr/drivers/sensor/paj7620.h>
+
+#define GESTURE_POLL_TIME_MS 100
+
+K_SEM_DEFINE(sem, 0, 1); /* starts off "not available" */
+
+static void trigger_handler(const struct device *dev, const struct sensor_trigger *trigger)
+{
+	ARG_UNUSED(trigger);
+
+	if (sensor_sample_fetch(dev) < 0) {
+		printf("sensor_sample_fetch failed\n");
+		return;
+	}
+
+	k_sem_give(&sem);
+}
+
+static void print_hand_gesture(uint16_t gest_flags)
+{
+	if ((gest_flags & PAJ7620_FLAG_GES_UP) != 0) {
+		printf("Gesture UP\n");
+	}
+	if ((gest_flags & PAJ7620_FLAG_GES_DOWN) != 0) {
+		printf("Gesture DOWN\n");
+	}
+	if ((gest_flags & PAJ7620_FLAG_GES_LEFT) != 0) {
+		printf("Gesture LEFT\n");
+	}
+	if ((gest_flags & PAJ7620_FLAG_GES_RIGHT) != 0) {
+		printf("Gesture RIGHT\n");
+	}
+	if ((gest_flags & PAJ7620_FLAG_GES_FORWARD) != 0) {
+		printf("Gesture FORWARD\n");
+	}
+	if ((gest_flags & PAJ7620_FLAG_GES_BACKWARD) != 0) {
+		printf("Gesture BACKWARD\n");
+	}
+	if ((gest_flags & PAJ7620_FLAG_GES_CLOCKWISE) != 0) {
+		printf("Gesture CLOCKWISE\n");
+	}
+	if ((gest_flags & PAJ7620_FLAG_GES_COUNTERCLOCKWISE) != 0) {
+		printf("Gesture COUNTER CLOCKWISE\n");
+	}
+}
+
+static void trigger_main_loop(const struct device *dev)
+{
+	struct sensor_value data;
+
+	while (1) {
+		k_sem_take(&sem, K_FOREVER);
+
+		(void)sensor_channel_get(dev, (enum sensor_channel)SENSOR_CHAN_PAJ7620_GESTURES,
+					 &data);
+
+		print_hand_gesture(data.val1);
+	}
+}
+
+static void polling_main_loop(const struct device *dev)
+{
+	struct sensor_value data;
+
+	while (1) {
+		(void)sensor_sample_fetch(dev);
+		(void)sensor_channel_get(dev, (enum sensor_channel)SENSOR_CHAN_PAJ7620_GESTURES,
+					 &data);
+
+		print_hand_gesture(data.val1);
+		k_msleep(GESTURE_POLL_TIME_MS);
+	}
+}
+
+int main(void)
+{
+	int ret;
+	const struct device *dev = DEVICE_DT_GET_ONE(pixart_paj7620);
+
+	struct sensor_trigger trig = {
+		.type = SENSOR_TRIG_MOTION,
+		.chan = (enum sensor_channel)SENSOR_CHAN_PAJ7620_GESTURES,
+	};
+
+	if (!device_is_ready(dev)) {
+		printf("Device %s is not ready\n", dev->name);
+		return -ENODEV;
+	}
+
+	if (IS_ENABLED(CONFIG_APP_USE_POLLING)) {
+		polling_main_loop(dev);
+	} else {
+		/* App was configured to NOT use polling, so use triggers */
+		ret = sensor_trigger_set(dev, &trig, trigger_handler);
+		if (ret < 0) {
+			printf("Could not set trigger\n");
+			return ret;
+		}
+
+		trigger_main_loop(dev);
+	}
+}