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CMakeLists.txt

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+# SPDX-License-Identifier: Apache-2.0
+
+cmake_minimum_required(VERSION 3.13.1)
+
+set(SHIELD adafruit_2_8_tft_touch_v2)
+
+find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
+project(lvgl)
+
+FILE(GLOB app_sources src/*.c)
+target_sources(app PRIVATE ${app_sources})

boards/nrf5340dk_nrf5340_cpuapp.overlay

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+&i2c1 {
+        status = "okay";
+       sda-pin = <34>; // P1.02 (34)
+       scl-pin = <35>; // P1.03 (35)
+
+	/* Sparkfun Environment Combo uses second I2C address */
+        ccs811: ccs811@5b {
+                compatible = "ams,ccs811";
+                reg = <0x5a>;
+                label = "CCS811";
+                irq-gpios = <&gpio0 36 GPIO_ACTIVE_LOW>; // P1.04 (36)
+                wake-gpios = <&gpio0 5 GPIO_ACTIVE_LOW>;
+                reset-gpios = <&gpio0 6 GPIO_ACTIVE_LOW>;
+        };
+
+        bme280@76 {
+		compatible = "bosch,bme280";
+		reg = <0x76>;
+		label = "BME280";
+	};
+};

prj.conf

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+CONFIG_HEAP_MEM_POOL_SIZE=16384
+CONFIG_MAIN_STACK_SIZE=4096
+
+CONFIG_NEWLIB_LIBC=y
+
+CONFIG_LOG=y
+
+CONFIG_BT=y
+CONFIG_BT_DEBUG_LOG=y
+CONFIG_BT_DEVICE_NAME="IAQ"
+
+CONFIG_SENSOR=y
+
+CONFIG_BME280=y
+CONFIG_CCS811=y
+
+
+CONFIG_DISPLAY=y
+CONFIG_DISPLAY_LOG_LEVEL_ERR=y
+
+CONFIG_LVGL=y
+CONFIG_LVGL_USE_THEME_MATERIAL=y
+CONFIG_LVGL_USE_LABEL=y
+CONFIG_LVGL_USE_LINEMETER=y
+CONFIG_LVGL_FONT_MONTSERRAT_14=y
+CONFIG_LVGL_FONT_MONTSERRAT_16=y
+CONFIG_LVGL_FONT_MONTSERRAT_18=y
+CONFIG_LVGL_FONT_MONTSERRAT_22=y
+

src/gui.c

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+#include <zephyr.h>
+#include <device.h>
+#include <drivers/display.h>
+#include <drivers/sensor.h>
+#include <lvgl.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "gui.h"
+
+#define LOG_LEVEL CONFIG_LOG_DEFAULT_LEVEL
+#include <logging/log.h>
+LOG_MODULE_REGISTER(gui);
+
+const struct device *display_dev;
+
+/* GUI objects ... 
+*/
+lv_obj_t *headline;
+lv_obj_t *qualitiy_meter;
+lv_obj_t *qualitiy_label;
+lv_obj_t *temp_label;
+lv_obj_t *temp_value_label;
+lv_obj_t *pressure_label;
+lv_obj_t *press_value_label;
+lv_obj_t *humidity_label;
+lv_obj_t *humid_value_label;
+lv_obj_t *co2_label;
+lv_obj_t *co2_value_label;
+lv_obj_t *tvoc_label;
+lv_obj_t *tvoc_value_label;
+
+/* GUI setup ... 
+*/
+void gui_setup(void)
+{
+	display_dev = device_get_binding(CONFIG_LVGL_DISPLAY_DEV_NAME);
+
+	if (display_dev == NULL)
+	{
+		LOG_ERR("Display device not found!");
+		return;
+	}
+
+	display_blanking_off(display_dev);
+
+	lv_theme_t *theme = lv_theme_material_init(LV_COLOR_GREEN, LV_COLOR_WHITE, LV_THEME_MATERIAL_FLAG_DARK, &lv_font_montserrat_14, &lv_font_montserrat_16, &lv_font_montserrat_18, &lv_font_montserrat_22);
+	lv_theme_set_act(theme);
+
+	headline = lv_label_create(lv_scr_act(), NULL);
+	qualitiy_meter = lv_linemeter_create(lv_scr_act(), NULL);
+	qualitiy_label = lv_label_create(lv_scr_act(), NULL);
+	temp_label = lv_label_create(lv_scr_act(), NULL);
+	temp_value_label = lv_label_create(lv_scr_act(), NULL);
+	pressure_label = lv_label_create(lv_scr_act(), NULL);
+	press_value_label = lv_label_create(lv_scr_act(), NULL);
+	humidity_label = lv_label_create(lv_scr_act(), NULL);
+	humid_value_label = lv_label_create(lv_scr_act(), NULL);
+	co2_label = lv_label_create(lv_scr_act(), NULL);
+	co2_value_label = lv_label_create(lv_scr_act(), NULL);
+	tvoc_label = lv_label_create(lv_scr_act(), NULL);
+	tvoc_value_label = lv_label_create(lv_scr_act(), NULL);
+
+	static lv_style_t large_style;
+	lv_style_init(&large_style);
+	lv_style_set_text_font(&large_style, LV_STATE_DEFAULT, lv_theme_get_font_title());
+
+	lv_obj_add_style(headline, LV_LABEL_PART_MAIN, &large_style);
+	lv_obj_set_x(headline, 115);
+	lv_obj_set_y(headline, 10);
+	lv_obj_set_height(headline, 20);
+	lv_obj_set_width(headline, 50);
+	lv_label_set_text(headline, "Air Quality");
+
+	lv_obj_set_x(qualitiy_meter, 10);
+	lv_obj_set_y(qualitiy_meter, 75);
+	lv_obj_set_width(qualitiy_meter, 90);
+	lv_obj_set_height(qualitiy_meter, 90);
+	lv_linemeter_set_range(qualitiy_meter, 0, 100);
+
+	lv_obj_set_x(qualitiy_label, 30);
+	lv_obj_set_y(qualitiy_label, 170);
+	lv_obj_set_width(qualitiy_label, 60);
+	lv_obj_set_height(qualitiy_label, 40);
+	lv_label_set_text(qualitiy_label, "Quality");
+
+	unsigned int line0_y = 50;
+	unsigned int line_space = 40;
+	unsigned int line = 0;
+
+	lv_obj_set_x(temp_label, 115);
+	lv_obj_set_y(temp_label, line0_y + line_space * line);
+	lv_label_set_text(temp_label, "Temp (C°)");
+	lv_obj_add_style(temp_value_label, LV_LABEL_PART_MAIN, &large_style);
+	lv_obj_set_x(temp_value_label, 245);
+	lv_obj_set_y(temp_value_label, line0_y + line_space * line);
+	lv_label_set_text(temp_value_label, "...");
+
+	line++;
+	lv_obj_set_x(pressure_label, 115);
+	lv_obj_set_y(pressure_label, line0_y + line_space * line);
+	lv_label_set_text(pressure_label, "Pressure (hPa)");
+	lv_obj_add_style(press_value_label, LV_LABEL_PART_MAIN, &large_style);
+	lv_obj_set_x(press_value_label, 245);
+	lv_obj_set_y(press_value_label, line0_y + line_space * line);
+	lv_label_set_text(press_value_label, "...");
+
+	line++;
+	lv_obj_set_x(humidity_label, 115);
+	lv_obj_set_y(humidity_label, line0_y + line_space * line);
+	lv_label_set_text(humidity_label, "Humidity (%)");
+	lv_obj_add_style(humid_value_label, LV_LABEL_PART_MAIN, &large_style);
+	lv_obj_set_x(humid_value_label, 245);
+	lv_obj_set_y(humid_value_label, line0_y + line_space * line);
+	lv_label_set_text(humid_value_label, "...");
+
+	line++;
+	lv_obj_set_x(co2_label, 115);
+	lv_obj_set_y(co2_label, line0_y + line_space * line);
+	lv_label_set_text(co2_label, "eCO2 (ppm)");
+	lv_obj_add_style(co2_value_label, LV_LABEL_PART_MAIN, &large_style);
+	lv_obj_set_x(co2_value_label, 245);
+	lv_obj_set_y(co2_value_label, line0_y + line_space * line);
+	lv_label_set_text(co2_value_label, "...");
+
+	line++;
+	lv_obj_set_x(tvoc_label, 115);
+	lv_obj_set_y(tvoc_label, line0_y + line_space * line);
+	lv_label_set_text(tvoc_label, "TVOC (ppb)");
+	lv_obj_add_style(tvoc_value_label, LV_LABEL_PART_MAIN, &large_style);
+	lv_obj_set_x(tvoc_value_label, 245);
+	lv_obj_set_y(tvoc_value_label, line0_y + line_space * line);
+	lv_label_set_text(tvoc_value_label, "...");
+}
+
+/* Updates the value label for the refered sensor channel / value ... 
+*/
+void gui_update_sensor_value(enum sensor_channel channel, struct sensor_value value)
+{
+	value.val2 = value.val2 / 10000;
+	switch (channel)
+	{
+	case SENSOR_CHAN_AMBIENT_TEMP:
+		lv_label_set_text_fmt(temp_value_label, "%d.%02d", value.val1, value.val2);
+		break;
+	case SENSOR_CHAN_PRESS:
+		lv_label_set_text_fmt(press_value_label, "%d.%02d", value.val1, value.val2);
+		break;
+	case SENSOR_CHAN_HUMIDITY:
+		lv_label_set_text_fmt(humid_value_label, "%d.%02d", value.val1, value.val2);
+		break;
+	case SENSOR_CHAN_CO2:
+		lv_label_set_text_fmt(co2_value_label, "%u", value.val1);
+		break;
+	case SENSOR_CHAN_VOC:
+		lv_label_set_text_fmt(tvoc_value_label, "%u", value.val1);
+		break;
+	}
+}
+
+/* Updates the line meter and it's label with the 'relative IQAI' and the rating ... 
+*/
+void gui_update_qmeter(int8_t quality, const char *rating)
+{
+	lv_linemeter_set_value(qualitiy_meter, quality);
+	lv_label_set_text(qualitiy_label, rating);
+}
+
+/* Thread for activating the LVGL taskhandler periodicly ... 
+*/
+void gui_run(void)
+{
+	while (1)
+	{
+		lv_task_handler();
+		k_sleep(K_MSEC(20));
+	}
+}
+
+// Define our GUI thread, using a stack size of 4096 and a priority of 7
+K_THREAD_DEFINE(gui_thread, 4096, gui_run, NULL, NULL, NULL, 7, 0, 0);

src/gui.h

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+#ifndef __GUI_H
+#define __GUI_H
+
+#include <zephyr.h>
+#include <drivers/sensor.h>
+
+void gui_setup(void);
+
+void gui_update_sensor_value(enum sensor_channel channel, struct sensor_value value);
+
+void gui_update_qmeter(int8_t quality, const char *rating);
+
+void gui_update_headline(const char *str);
+
+#endif