Create Zephyr workspace app

app/CMakeLists.txt

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+#-------------------------------------------------------------------------------
+# Zephyr Example Application
+#
+# Copyright (c) 2021 Nordic Semiconductor ASA
+# SPDX-License-Identifier: Apache-2.0
+
+cmake_minimum_required(VERSION 3.13.1)
+find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
+
+project(app LANGUAGES C)
+
+target_sources(app PRIVATE src/main.c)
+
+# The code below locates the git index file for this repository and adds it as a dependency for
+# the application VERSION file so that if the repo has a new commit added, even if no files in
+# the build have changed, the application version file will be regenerated with the new git commit
+find_package(Git QUIET)
+if(GIT_FOUND)
+  execute_process(
+    COMMAND ${GIT_EXECUTABLE} rev-parse --absolute-git-dir
+    WORKING_DIRECTORY .
+    OUTPUT_VARIABLE application_git_dir
+    OUTPUT_STRIP_TRAILING_WHITESPACE
+    ERROR_STRIP_TRAILING_WHITESPACE
+    ERROR_VARIABLE stderr
+    RESULT_VARIABLE return_code
+  )
+  # If there is an error e.g. it is not a git repo, we just silently ignore it and continue
+  # without a dependency, this will be the case with freestanding applications.
+  if(NOT return_code)
+    if(NOT "${stderr}" STREQUAL "")
+      message(WARNING "Application build version git rev-parse warned: ${stderr}")
+    endif()
+
+    set_property(TARGET app_version_h PROPERTY APP_VERSION_DEPENDS ${application_git_dir}/index)
+  endif()
+endif()

app/Kconfig

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+# Copyright (c) 2021 Nordic Semiconductor ASA
+# SPDX-License-Identifier: Apache-2.0
+#
+# This file is the application Kconfig entry point. All application Kconfig
+# options can be defined here or included via other application Kconfig files.
+# You can browse these options using the west targets menuconfig (terminal) or
+# guiconfig (GUI).
+
+menu "Zephyr"
+source "Kconfig.zephyr"
+endmenu
+
+module = APP
+module-str = APP
+source "subsys/logging/Kconfig.template.log_config"

app/VERSION

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+VERSION_MAJOR = 1
+VERSION_MINOR = 0
+PATCHLEVEL = 0
+VERSION_TWEAK = 0
+EXTRAVERSION =

app/boards/nucleo_f302r8.overlay

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+/*
+ * Copyright (c) 2021 Nordic Semiconductor ASA
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/* This devicetree overlay file will be automatically picked by the Zephyr
+ * build system when building the sample for the nucleo_f302r8 board. It shows
+ * how the example-application can be built on sample boards already provided
+ * by Zephyr.
+ */
+
+/ {
+	example_sensor: example-sensor {
+		compatible = "zephyr,example-sensor";
+		input-gpios = <&gpioc 13 (GPIO_PULL_UP | GPIO_ACTIVE_LOW)>;
+	};
+
+	blink_led: blink-led {
+		compatible = "blink-gpio-led";
+		led-gpios = <&gpiob 13 GPIO_ACTIVE_HIGH>;
+		blink-period-ms = <1000>;
+	};
+};
+
+&gpioc {
+	status = "okay";
+};

app/debug.conf

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+# Copyright (c) 2021 Nordic Semiconductor ASA
+# SPDX-License-Identifier: Apache-2.0
+#
+# This is a Kconfig fragment which can be used to enable debug-related options
+# in the application. See the README for more details.
+
+# compiler
+CONFIG_DEBUG_OPTIMIZATIONS=y
+
+# logging
+CONFIG_LOG=y
+CONFIG_APP_LOG_LEVEL_DBG=y

app/prj.conf

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+# Copyright (c) 2021 Nordic Semiconductor ASA
+# SPDX-License-Identifier: Apache-2.0
+#
+# This file contains selected Kconfig options for the application.
+
+CONFIG_SENSOR=y
+CONFIG_BLINK=y

app/sample.yaml

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+# This file is provided so that the application can be compiled using Twister,
+# the Zephyr testing tool. In this file, multiple combinations can be specified,
+# so that you can easily test all of them locally or in CI.
+sample:
+  description: Example application
+  name: example-application 
+common:
+  build_only: true
+  integration_platforms:
+    - custom_plank
+    - nucleo_f302r8
+tests:
+  app.default: {}
+  app.debug:
+    extra_overlay_confs:
+      - debug.conf

app/src/main.c

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+/*
+ * Copyright (c) 2021 Nordic Semiconductor ASA
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr/kernel.h>
+#include <zephyr/drivers/sensor.h>
+#include <zephyr/logging/log.h>
+
+#include <app/drivers/blink.h>
+
+#include <app_version.h>
+
+LOG_MODULE_REGISTER(main, CONFIG_APP_LOG_LEVEL);
+
+#define BLINK_PERIOD_MS_STEP 100U
+#define BLINK_PERIOD_MS_MAX  1000U
+
+int main(void)
+{
+	int ret;
+	unsigned int period_ms = BLINK_PERIOD_MS_MAX;
+	const struct device *sensor, *blink;
+	struct sensor_value last_val = { 0 }, val;
+
+	printk("Zephyr Example Application %s\n", APP_VERSION_STRING);
+
+	sensor = DEVICE_DT_GET(DT_NODELABEL(example_sensor));
+	if (!device_is_ready(sensor)) {
+		LOG_ERR("Sensor not ready");
+		return 0;
+	}
+
+	blink = DEVICE_DT_GET(DT_NODELABEL(blink_led));
+	if (!device_is_ready(blink)) {
+		LOG_ERR("Blink LED not ready");
+		return 0;
+	}
+
+	ret = blink_off(blink);
+	if (ret < 0) {
+		LOG_ERR("Could not turn off LED (%d)", ret);
+		return 0;
+	}
+
+	printk("Use the sensor to change LED blinking period\n");
+
+	while (1) {
+		ret = sensor_sample_fetch(sensor);
+		if (ret < 0) {
+			LOG_ERR("Could not fetch sample (%d)", ret);
+			return 0;
+		}
+
+		ret = sensor_channel_get(sensor, SENSOR_CHAN_PROX, &val);
+		if (ret < 0) {
+			LOG_ERR("Could not get sample (%d)", ret);
+			return 0;
+		}
+
+		if ((last_val.val1 == 0) && (val.val1 == 1)) {
+			if (period_ms == 0U) {
+				period_ms = BLINK_PERIOD_MS_MAX;
+			} else {
+				period_ms -= BLINK_PERIOD_MS_STEP;
+			}
+
+			printk("Proximity detected, setting LED period to %u ms\n",
+			       period_ms);
+			blink_set_period_ms(blink, period_ms);
+		}
+
+		last_val = val;
+
+		k_sleep(K_MSEC(100));
+	}
+
+	return 0;
+}
+