samples: sensors: add generic co2 sensor polling

Add polling sample for any CO2 sensor.

Signed-off-by: Jeppe Odgaard <jeppe.odgaard@prevas.dk>

samples/sensor/co2_polling/CMakeLists.txt

@@ -0,0 +1,7 @@
+# SPDX-License-Identifier: Apache-2.0
+
+cmake_minimum_required(VERSION 3.20.0)
+find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
+project(co2_polling)
+
+target_sources(app PRIVATE src/main.c)

samples/sensor/co2_polling/README.rst

@@ -0,0 +1,30 @@
+.. co2:
+
+Generic CO2 polling sample
+##########################
+
+Overview
+********
+
+A sensor sample that demonstrates how to poll a CO2 sensor.
+
+Building and Running
+********************
+
+This sample reads the CO2 sensor and print the values continuously.
+
+.. zephyr-app-commands::
+   :zephyr-app: samples/sensor/co2_polling
+   :board: <board to use>
+   :goals: build flash
+   :compact:
+
+Sample Output
+=============
+
+.. code-block:: console
+
+   CO2 940 ppm
+   CO2 950 ppm
+
+<repeats endlessly>

samples/sensor/co2_polling/boards/nucleo_h563zi.conf

@@ -0,0 +1 @@
+CONFIG_UART_INTERRUPT_DRIVEN=y

samples/sensor/co2_polling/boards/nucleo_h563zi.overlay

@@ -0,0 +1,15 @@
+/ {
+	aliases {
+		co2 = &explorir_m;
+	};
+};
+
+&lpuart1 {
+	status = "okay";
+	current-speed = <9600>;
+
+	explorir_m: explorir_m {
+		compatible = "gss,explorir-m";
+		status = "okay";
+	};
+};

samples/sensor/co2_polling/prj.conf

@@ -0,0 +1,7 @@
+CONFIG_STDOUT_CONSOLE=y
+CONFIG_LOG=y
+CONFIG_SHELL=y
+CONFIG_SENSOR_SHELL=y
+CONFIG_SERIAL=y
+CONFIG_SENSOR=y
+CONFIG_SENSOR_LOG_LEVEL_DBG=y

samples/sensor/co2_polling/sample.yaml

@@ -0,0 +1,8 @@
+sample:
+  name: CO2 sensor sample
+tests:
+  sample.sensor.co2:
+    harness: sensor
+    tags: sensors
+    filter: dt_alias_exists("co2")
+    depends_on: serial uart_interrupt_driven

samples/sensor/co2_polling/src/main.c

@@ -0,0 +1,33 @@
+/*
+ * Copyright (c) 2023, Vitrolife A/S
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr/kernel.h>
+#include <zephyr/drivers/sensor.h>
+#include <zephyr/logging/log.h>
+
+LOG_MODULE_REGISTER(MAIN);
+
+int main(void)
+{
+	struct sensor_value value;
+	const struct device *const dev = DEVICE_DT_GET(DT_ALIAS(co2));
+
+	if (!device_is_ready(dev)) {
+		LOG_ERR("%s is not ready", dev->name);
+		return 0;
+	}
+
+	while (1) {
+		if (sensor_sample_fetch(dev) == 0 &&
+		    sensor_channel_get(dev, SENSOR_CHAN_CO2, &value) == 0) {
+			LOG_INF("CO2 %d ppm", value.val1);
+		}
+
+		k_msleep(1000);
+	}
+
+	return 0;
+}