samples: sensor: Barometric pressure interrupt generic example

Reports generic barometric sensor interrupts
* Data ready interrupt
* Pressure threshold interrupt
* Pressure changed interrupt

Signed-off-by: Remi Buisson <remi.buisson@tdk.com>

samples/sensor/pressure_interrupt/CMakeLists.txt

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+#
+# Copyright (c) 2024 TDK Invensense
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+cmake_minimum_required(VERSION 3.20.0)
+find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
+project(icp201xx)
+
+FILE(GLOB app_sources src/*.c)
+target_sources(app PRIVATE ${app_sources})

samples/sensor/pressure_interrupt/Kconfig

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+# Copyright (c) 2024, TDK Invensense
+# SPDX-License-Identifier: Apache-2.0
+
+config LOG
+	default y
+
+config LOG_PRINTK
+	default y
+
+config SENSOR_LOG_LEVEL
+	default 4
+
+config PRESSURE_DRDY
+	bool "Enable pressure data ready interrupt"
+	default y
+
+config PRESSURE_THRESHOLD
+	bool "Enable pressure threshold interrupt"
+	default y
+
+config PRESSURE_DELTA
+	bool "Enable pressure delta interrupt"
+	default y
+
+choice ICP201XX_TRIGGER_MODE
+	default ICP201XX_TRIGGER_GLOBAL_THREAD
+	depends on ICP201XX
+
+endchoice
+
+source "Kconfig.zephyr"

samples/sensor/pressure_interrupt/README.rst

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+.. zephyr:code-sample:: pressure_interrupt
+   :name: Barometric pressure and temperature sensor interrupt example
+   :relevant-api: sensor_interface
+
+   Manage interrupts from a barometric pressure and temperature sensor.
+
+Overview
+********
+
+This sample application uses a pressure sensor interrupt line to:
+
+* Inform when a measure is available in the sensor FIFO.
+  Temperature and pressure data are read and displayed in terminal.
+  If floats are supported, estimated altitude is also displayed.
+* Inform when the pressure value crosses a specified threshold.
+  Threshold corresponds to around a 50cm altitude increase.
+  A message is displayed in the terminal.
+* Inform when the pressure value changed more than the specified
+  value between two consecutive samples.
+  Change value corresponds to a finger pressing the sensor.
+  A message is displayed in the terminal.
+
+Wiring
+*******
+
+This sample uses an external breakout for the sensor.  A devicetree
+overlay must be provided to identify the I2C/SPI bus and GPIO used to
+control the sensor.
+
+Building and Running
+********************
+
+This sample supports pressure sensor devices. Device needs
+to be aliased as ``pressure-sensor``. For example:
+
+.. code-block:: devicetree
+
+	/ {
+		aliases {
+			pressure-sensor = &icp201xx;
+		};
+	};
+
+Make sure the aliases are in devicetree, then build and run with:
+
+.. zephyr-app-commands::
+   :zephyr-app: samples/sensor/pressure_interrupt
+   :board: nrf52dk/nrf52832
+   :goals: build flash
+
+Sample Output
+=============
+
+.. code-block:: console
+
+## Default configuration
+
+   [00:00:00.266,479] <inf> PRESS_INT_SAMPLE: Starting ICP201xx sample.
+   [00:00:00.273,803] <inf> PRESS_INT_SAMPLE: temp 25.49 Cel, pressure 96.271438 kPa, altitude 447.208465 m
+   [00:00:00.280,914] <inf> PRESS_INT_SAMPLE: temp 25.50 Cel, pressure 96.271331 kPa, altitude 447.234161 m
+   [00:00:00.288,024] <inf> PRESS_INT_SAMPLE: temp 25.49 Cel, pressure 96.266685 kPa, altitude 447.636077 m
+   [00:00:00.295,135] <inf> PRESS_INT_SAMPLE: temp 25.50 Cel, pressure 96.267951 kPa, altitude 447.537078 m
+   [00:00:00.302,246] <inf> PRESS_INT_SAMPLE: temp 25.51 Cel, pressure 96.268577 kPa, altitude 447.488281 m
+   [00:00:00.309,356] <inf> PRESS_INT_SAMPLE: temp 25.50 Cel, pressure 96.269340 kPa, altitude 447.414978 m
+   [00:00:00.316,467] <inf> PRESS_INT_SAMPLE: temp 25.50 Cel, pressure 96.268562 kPa, altitude 447.473663 m
+   [00:00:00.323,547] <inf> PRESS_INT_SAMPLE: temp 25.50 Cel, pressure 96.267341 kPa, altitude 447.596496 m
+   <repeats endlessly>
+
+   <when sensor is pressed>
+   [00:00:09.819,061] <inf> PRESS_INT_SAMPLE: PRESSURE CHANGE INTERRUPT
+
+   <when the sensor pressure crosses defined threhold>
+   [00:00:09.859,039] <inf> PRESS_INT_SAMPLE: PRESSURE THRESHOLD INTERRUPT

samples/sensor/pressure_interrupt/boards/nrf52dk_nrf52832.overlay

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+/*
+ * Copyright (c) 2024, TDK Invensense
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/*
+ * Get a node identifier for pressure sensor.
+ */
+/ {
+	aliases {
+		pressure-sensor = &icp201xx;
+	};
+};
+
+/* Example configuration of a ICP2021XX device on an Arduino SPI bus. */
+&arduino_spi {
+	status = "okay";
+	cs-gpios = <&arduino_header 14 GPIO_ACTIVE_LOW>; /* D8 */
+	icp201xx: icp201xx@0 {
+		compatible = "invensense,icp201xx";
+		reg = <0>;
+		spi-max-frequency = <500000>; /* conservatively set to 500k */
+		int-gpios = <&arduino_header 8 GPIO_ACTIVE_HIGH>; /* D2 */
+		drive-strength = "current_4mA_1_8V"; /* Avoid cross talk */
+	};
+};
+
+/*
+ * Increase native UART speed.
+ */
+&uart0 {
+	compatible = "nordic,nrf-uarte";
+	status = "okay";
+	current-speed = <1000000>;
+};

samples/sensor/pressure_interrupt/prj.conf

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+#
+# Copyright (c) 2024 TDK Invensense
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+CONFIG_SENSOR=y
+
+# Floating point format support
+# Selecting this increases stack size requirements slightly, but increases code size significantly.
+CONFIG_CBPRINTF_FP_SUPPORT=y
+
+# Buffer size for console. The defaults are optimized to save RAM
+CONFIG_CONSOLE_SUBSYS=y
+CONFIG_CONSOLE_GETCHAR=y
+CONFIG_CONSOLE_GETCHAR_BUFSIZE=16
+CONFIG_CONSOLE_PUTCHAR_BUFSIZE=512

samples/sensor/pressure_interrupt/sample.yaml

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+sample:
+  name: Pressure sensor interrupt
+tests:
+  sample.sensor.pressure_interrupt:
+    build_only: true
+    tags: sensors
+    filter: dt_alias_exists("pressure-sensor")
+    integration_platforms:
+      - nrf52dk/nrf52832

samples/sensor/pressure_interrupt/src/main.c

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+/*
+ * Copyright (c) 2024 TDK Invensense
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr/kernel.h>
+#include <zephyr/device.h>
+#include <zephyr/devicetree.h>
+#include <zephyr/drivers/sensor.h>
+#include <stdio.h>
+#include <zephyr/logging/log.h>
+
+LOG_MODULE_REGISTER(PRESS_INT_SAMPLE, CONFIG_SENSOR_LOG_LEVEL);
+
+/*
+ * Get a device structure from a devicetree node from alias
+ * "pressure_sensor".
+ */
+static const struct device *get_pressure_sensor_device(void)
+{
+	const struct device *const dev = DEVICE_DT_GET(DT_ALIAS(pressure_sensor));
+
+	if (!device_is_ready(dev)) {
+		printk("\nError: Device \"%s\" is not ready; "
+		       "check the driver initialization logs for errors.\n",
+		       dev->name);
+		return NULL;
+	}
+
+	printk("Found device \"%s\", getting sensor data\n", dev->name);
+	return dev;
+}
+
+#ifdef CONFIG_PRESSURE_DRDY
+static void data_ready_handler(const struct device *dev, const struct sensor_trigger *trig)
+{
+
+	if (trig->type == SENSOR_TRIG_DATA_READY) {
+		int rc = sensor_sample_fetch_chan(dev, trig->chan);
+
+		if (rc < 0) {
+			printf("sample fetch failed: %d\n", rc);
+			printf("cancelling trigger\n");
+			(void)sensor_trigger_set(dev, trig, NULL);
+			return;
+		} else if (rc == 0) {
+
+			struct sensor_value pressure;
+			struct sensor_value temperature;
+			struct sensor_value altitude;
+
+			sensor_channel_get(dev, SENSOR_CHAN_PRESS, &pressure);
+			sensor_channel_get(dev, SENSOR_CHAN_AMBIENT_TEMP, &temperature);
+			sensor_channel_get(dev, SENSOR_CHAN_ALTITUDE, &altitude);
+
+			LOG_INF("temp %.2f Cel, pressure %f kPa, altitude %f m",
+				sensor_value_to_double(&temperature),
+				sensor_value_to_double(&pressure),
+				sensor_value_to_double(&altitude));
+		}
+	}
+}
+#endif
+
+#ifdef CONFIG_PRESSURE_THRESHOLD
+static void threshold_handler(const struct device *dev, const struct sensor_trigger *trig)
+{
+	if (trig->type == SENSOR_TRIG_THRESHOLD) {
+		LOG_INF("PRESSURE THRESHOLD INTERRUPT");
+	}
+}
+#endif
+
+#ifdef CONFIG_PRESSURE_DELTA
+static void delta_handler(const struct device *dev, const struct sensor_trigger *trig)
+{
+	if (trig->type == SENSOR_TRIG_DELTA) {
+		LOG_INF("PRESSURE CHANGE INTERRUPT\n");
+	}
+}
+#endif
+
+int main(void)
+{
+	static struct sensor_trigger trigger;
+	const struct device *dev = get_pressure_sensor_device();
+#ifdef CONFIG_PRESSURE_THRESHOLD
+	struct sensor_value pressure, pressure_threshold;
+#endif
+#ifdef CONFIG_PRESSURE_DELTA
+	struct sensor_value pressure_delta;
+#endif
+
+	if (dev == NULL) {
+		return 0;
+	}
+#ifdef CONFIG_PRESSURE_DRDY
+	/* Configure data ready trigger */
+	trigger = (struct sensor_trigger){
+		.type = SENSOR_TRIG_DATA_READY,
+		.chan = SENSOR_CHAN_ALL,
+	};
+	if (sensor_trigger_set(dev, &trigger, data_ready_handler) < 0) {
+		printf("Cannot configure data trigger!!!\n");
+		return 0;
+	}
+#endif
+
+#ifdef CONFIG_PRESSURE_THRESHOLD
+	/* Configure pressure threshold trigger */
+	/* Interrupt is triggered if sensor is lifted of about 50cm */
+	/* Read current pressure */
+	k_sleep(K_MSEC(50));
+	sensor_sample_fetch_chan(dev, SENSOR_CHAN_PRESS);
+	sensor_channel_get(dev, SENSOR_CHAN_PRESS, &pressure);
+
+	/* Retrieve 5 Pa, around 50cm altitude increase */
+	pressure_threshold.val1 = pressure.val1;
+	pressure_threshold.val2 = pressure.val2 - 5000;
+	sensor_attr_set(dev, SENSOR_CHAN_PRESS, SENSOR_ATTR_LOWER_THRESH, &pressure_threshold);
+
+	LOG_INF("Pressure at reset %.3f kPa, interrupt sets at %.3f kPa.\n",
+		sensor_value_to_double(&pressure), sensor_value_to_double(&pressure_threshold));
+
+	trigger = (struct sensor_trigger){
+		.type = SENSOR_TRIG_THRESHOLD,
+		.chan = SENSOR_CHAN_PRESS,
+	};
+	if (sensor_trigger_set(dev, &trigger, threshold_handler) < 0) {
+		printf("Cannot configure threshold trigger!!!\n");
+		return 0;
+	}
+#endif
+
+#ifdef CONFIG_PRESSURE_DELTA
+	/* Configure pressure delta trigger */
+	/* Set pressure delta to 0.01 kPa to detect a press on the sensor */
+	pressure_delta.val1 = 0;
+	pressure_delta.val2 = 10000;
+	sensor_attr_set(dev, SENSOR_CHAN_PRESS, SENSOR_ATTR_SLOPE_TH, &pressure_delta);
+	trigger = (struct sensor_trigger){
+		.type = SENSOR_TRIG_DELTA,
+		.chan = SENSOR_CHAN_PRESS,
+	};
+	if (sensor_trigger_set(dev, &trigger, delta_handler) < 0) {
+		printf("Cannot configure threshold trigger!!!\n");
+		return 0;
+	}
+#endif
+
+	LOG_INF("Starting pressure event sample.\n");
+
+	return 0;
+}