refactored project structure

src/devices.hpp

@@ -0,0 +1,17 @@
+#pragma once
+
+#include <version.h>
+
+#if ZEPHYR_VERSION_CODE >= ZEPHYR_VERSION(3,1,0)
+#include <zephyr/device.h>
+#include <zephyr/devicetree.h>
+#include <zephyr/drivers/gpio.h>
+#else
+#include <device.h>
+#include <devicetree.h>
+#include <drivers/gpio.h>
+#endif
+
+static const struct gpio_dt_spec led0 = GPIO_DT_SPEC_GET(DT_ALIAS(led0), gpios);
+
+bool verify_are_devices_available(void);