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The following commit(s) were added to refs/heads/master by this push:
new 5114ddd6c examples/baromonitor: New LVGL example which integrates with
barometer
5114ddd6c is described below
commit 5114ddd6c02d38d8bffa940edc2c2c7afb09b10c
Author: Matteo Golin <[email protected]>
AuthorDate: Mon Jun 22 20:49:27 2026 -0400
examples/baromonitor: New LVGL example which integrates with barometer
This example is an LVGL application which reads pressure and temperature
data from a barometer and displays it on gauges. It is intended to
provide an idea of what LVGL on NuttX can practically be used for in an
application.
Signed-off-by: Matteo Golin <[email protected]>
---
examples/baromonitor/CMakeLists.txt | 35 +++
examples/baromonitor/Kconfig | 38 +++
examples/baromonitor/Make.defs | 25 ++
examples/baromonitor/Makefile | 36 +++
examples/baromonitor/baromonitor_main.c | 419 ++++++++++++++++++++++++++++++++
5 files changed, 553 insertions(+)
diff --git a/examples/baromonitor/CMakeLists.txt
b/examples/baromonitor/CMakeLists.txt
new file mode 100644
index 000000000..e047922f8
--- /dev/null
+++ b/examples/baromonitor/CMakeLists.txt
@@ -0,0 +1,35 @@
+#
##############################################################################
+# apps/examples/baromonitor/CMakeLists.txt
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
contributor
+# license agreements. See the NOTICE file distributed with this work for
+# additional information regarding copyright ownership. The ASF licenses this
+# file to you under the Apache License, Version 2.0 (the "License"); you may
not
+# use this file except in compliance with the License. You may obtain a copy
of
+# the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations under
+# the License.
+#
+#
##############################################################################
+
+if(CONFIG_EXAMPLES_BAROMONITOR)
+ nuttx_add_application(
+ NAME
+ ${CONFIG_EXAMPLES_BAROMONITOR_PROGNAME}
+ PRIORITY
+ ${CONFIG_EXAMPLES_BAROMONITOR_PRIORITY}
+ STACKSIZE
+ ${CONFIG_EXAMPLES_BAROMONITOR_STACKSIZE}
+ MODULE
+ ${CONFIG_EXAMPLES_BAROMONITOR}
+ SRCS
+ baromonitor_main.c)
+endif()
diff --git a/examples/baromonitor/Kconfig b/examples/baromonitor/Kconfig
new file mode 100644
index 000000000..7ef4f17bc
--- /dev/null
+++ b/examples/baromonitor/Kconfig
@@ -0,0 +1,38 @@
+#
+# For a description of the syntax of this configuration file,
+# see the file kconfig-language.txt in the NuttX tools repository.
+#
+
+config EXAMPLES_BAROMONITOR
+ tristate "Barometer monitoring dashboard example"
+ default n
+ depends on UORB
+ depends on LIBC_FLOATINGPOINT
+ depends on GRAPHICS_LVGL
+ depends on LV_USE_NUTTX
+ depends on LV_FONT_MONTSERRAT_24
+ depends on LV_FONT_MONTSERRAT_32
+ ---help---
+ Enable the barometer monitoring dashboard.
+
+if EXAMPLES_BAROMONITOR
+
+config EXAMPLES_BAROMONITOR_PROGNAME
+ string "Program name"
+ default "baromonitor"
+
+config EXAMPLES_BAROMONITOR_PRIORITY
+ int "Barometer monitor task priority"
+ default 100
+
+config EXAMPLES_BAROMONITOR_STACKSIZE
+ int "Baromonitor stack size"
+ default DEFAULT_TASK_STACKSIZE
+
+config EXAMPLES_BAROMONITOR_SAMPLERATE
+ int "Sample rate (ms)"
+ default 50
+ ---help---
+ Sample rate in milliseconds of barometer data.
+
+endif # EXAMPLES_BARO_DASHBOARD
diff --git a/examples/baromonitor/Make.defs b/examples/baromonitor/Make.defs
new file mode 100644
index 000000000..206ea679f
--- /dev/null
+++ b/examples/baromonitor/Make.defs
@@ -0,0 +1,25 @@
+############################################################################
+# apps/examples/baromonitor/Make.defs
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements. See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership. The
+# ASF licenses this file to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance with the
+# License. You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+#
+############################################################################
+
+ifneq ($(CONFIG_EXAMPLES_BAROMONITOR),)
+CONFIGURED_APPS += $(APPDIR)/examples/baromonitor
+endif
diff --git a/examples/baromonitor/Makefile b/examples/baromonitor/Makefile
new file mode 100644
index 000000000..8fe37e36f
--- /dev/null
+++ b/examples/baromonitor/Makefile
@@ -0,0 +1,36 @@
+############################################################################
+# apps/examples/baromonitor/Makefile
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements. See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership. The
+# ASF licenses this file to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance with the
+# License. You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+#
+############################################################################
+
+include $(APPDIR)/Make.defs
+
+# BAROMONITOR Barometer sensor example built-in application info
+
+PROGNAME = $(CONFIG_EXAMPLES_BAROMONITOR_PROGNAME)
+PRIORITY = $(CONFIG_EXAMPLES_BAROMONITOR_PRIORITY)
+STACKSIZE = $(CONFIG_EXAMPLES_BAROMONITOR_STACKSIZE)
+MODULE = $(CONFIG_EXAMPLES_BAROMONITOR)
+
+# BAROMONITOR Barometer sensor example
+
+MAINSRC = baromonitor_main.c
+
+include $(APPDIR)/Application.mk
diff --git a/examples/baromonitor/baromonitor_main.c
b/examples/baromonitor/baromonitor_main.c
new file mode 100644
index 000000000..c3a93d6b9
--- /dev/null
+++ b/examples/baromonitor/baromonitor_main.c
@@ -0,0 +1,419 @@
+/****************************************************************************
+ * apps/examples/baromonitor/baromonitor_main.c
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership. The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <fcntl.h>
+#include <stdio.h>
+#include <unistd.h>
+
+#include <uORB/uORB.h>
+
+#include <lvgl/lvgl.h>
+
+#include <nuttx/sensors/sensor.h>
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+#define PRESSURE_COLOUR 0xef4444
+#define TEMPERATURE_COLOUR 0x6366f1
+
+#define LINE_WIDTH (8)
+#define GAUGE_SIZE (600)
+
+/* Axis limits */
+
+#define PRESS_MIN (960)
+#define PRESS_MAX (1010)
+
+#define TEMP_MIN (-30)
+#define TEMP_MAX (60)
+#define TEMP_THRESH (TEMP_MAX - 10)
+
+#define PRESS_MAJOR_TICKS_EVERY (5)
+#define TEMP_MAJOR_TICKS_EVERY (5)
+
+#define NUM_TEMP_LABELS ((TEMP_MAX - TEMP_MIN) / TEMP_MAJOR_TICKS_EVERY)
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+static const char *g_temp_labels[NUM_TEMP_LABELS + 1];
+static char g_label_buf[NUM_TEMP_LABELS][8];
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+#ifdef CONFIG_LV_USE_NUTTX_LIBUV
+static void lv_nuttx_uv_loop(uv_loop_t *loop, lv_nuttx_result_t *result)
+{
+ lv_nuttx_uv_t uv_info;
+ void *data;
+
+ uv_loop_init(loop);
+
+ lv_memset(&uv_info, 0, sizeof(uv_info));
+ uv_info.loop = loop;
+ uv_info.disp = result->disp;
+ uv_info.indev = result->indev;
+#ifdef CONFIG_UINPUT_TOUCH
+ uv_info.uindev = result->utouch_indev;
+#endif
+
+ data = lv_nuttx_uv_init(&uv_info);
+ uv_run(loop, UV_RUN_DEFAULT);
+ lv_nuttx_uv_deinit(&data);
+}
+#endif
+
+static void set_column_flex(lv_obj_t *obj)
+{
+ lv_obj_set_flex_flow(obj, LV_FLEX_FLOW_COLUMN);
+ lv_obj_set_style_flex_main_place(obj, LV_FLEX_ALIGN_CENTER, 0);
+ lv_obj_set_style_flex_cross_place(obj, LV_FLEX_ALIGN_CENTER, 0);
+ lv_obj_set_style_flex_track_place(obj, LV_FLEX_ALIGN_CENTER, 0);
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * baromonitor_main
+ ****************************************************************************/
+
+int main(int argc, FAR char *argv[])
+{
+ lv_nuttx_dsc_t info;
+ lv_nuttx_result_t result;
+ lv_obj_t *screen;
+ lv_obj_t *gauge_cont;
+ lv_obj_t *press_gauge;
+ lv_obj_t *press_line;
+ lv_obj_t *press_cont;
+ lv_obj_t *press_label;
+ lv_obj_t *temp_gauge;
+ lv_obj_t *temp_line;
+ lv_obj_t *temp_cont;
+ lv_obj_t *temp_label;
+ lv_obj_t *title_cont;
+ lv_obj_t *title;
+ lv_scale_section_t *section;
+ lv_style_t indicator_style;
+ lv_style_t minor_ticks_style;
+ lv_style_t main_line_style;
+ lv_style_t section_label_style;
+ lv_style_t section_minor_ticks_style;
+ lv_style_t section_main_line_style;
+
+#ifdef CONFIG_LV_USE_NUTTX_LIBUV
+ uv_loop_t ui_loop;
+#endif
+
+ int err;
+ int fd;
+ bool got_data;
+ struct sensor_baro sensor_data;
+ unsigned instance = 0;
+ char topic[32];
+
+ if (argc == 2)
+ {
+ instance = atoi(argv[1]);
+ }
+
+ snprintf(topic, sizeof(topic), "sensor_baro%u", instance);
+
+ fd = orb_open("sensor_baro", instance, O_RDONLY | O_NONBLOCK);
+ if (fd < 0)
+ {
+ fprintf(stderr, "Could not open %s: %d\n", topic, errno);
+ return EXIT_FAILURE;
+ }
+
+ printf("Subscribed to %s\n", topic);
+
+ /* LVGL setup */
+
+#ifdef CONFIG_LV_USE_NUTTX_LIBUV
+ lv_memzero(&ui_loop, sizeof(ui_loop));
+#endif
+
+ if (!lv_is_initialized())
+ {
+ printf("Initializing LVGL...\n");
+ lv_init();
+ printf("LVGL initialized...\n");
+ }
+
+ lv_nuttx_dsc_init(&info);
+ lv_nuttx_init(&info, &result);
+
+ if (result.disp == NULL)
+ {
+ fprintf(stderr, "Failed to initialize LVGL.\n");
+ close(fd);
+ return EXIT_FAILURE;
+ }
+
+ /* Set up stuff to render */
+
+ screen = lv_screen_active();
+ set_column_flex(screen);
+
+ /* Create containers for layout. We want a spanning title, followed by two
+ * side-by-side containers for the gauges.
+ *
+ * Gauge container is therefore a ROW flex, while its inner containers are
+ * column flex (scale followed by a label below)
+ */
+
+ title_cont = lv_obj_create(screen);
+ lv_obj_set_size(title_cont, LV_PCT(100), LV_PCT(10));
+ lv_obj_align(title_cont, LV_ALIGN_CENTER, 0, 0);
+ title = lv_label_create(title_cont);
+ lv_label_set_text(title, "Barometer monitor");
+ lv_obj_set_style_text_font(title, &lv_font_montserrat_32, 0);
+ lv_obj_align(title, LV_ALIGN_CENTER, 0, 0);
+
+ gauge_cont = lv_obj_create(screen);
+ lv_obj_set_size(gauge_cont, LV_PCT(100), LV_PCT(90));
+ lv_obj_set_flex_flow(gauge_cont, LV_FLEX_FLOW_ROW);
+ lv_obj_set_style_flex_main_place(gauge_cont, LV_FLEX_ALIGN_CENTER, 0);
+ lv_obj_set_style_flex_cross_place(gauge_cont, LV_FLEX_ALIGN_CENTER, 0);
+ lv_obj_set_style_flex_track_place(gauge_cont, LV_FLEX_ALIGN_CENTER, 0);
+
+ press_cont = lv_obj_create(gauge_cont);
+ temp_cont = lv_obj_create(gauge_cont);
+ set_column_flex(press_cont);
+ set_column_flex(temp_cont);
+ lv_obj_set_size(press_cont, LV_PCT(50), LV_PCT(100));
+ lv_obj_set_size(temp_cont, LV_PCT(50), LV_PCT(100));
+
+ /* TODO: Get the text labels on the gauges to be padded better */
+
+ /* Pressure gauge */
+
+ press_gauge = lv_scale_create(press_cont);
+
+ lv_obj_set_size(press_gauge, GAUGE_SIZE, GAUGE_SIZE);
+ lv_scale_set_mode(press_gauge, LV_SCALE_MODE_ROUND_INNER);
+ lv_obj_set_style_bg_opa(press_gauge, LV_OPA_COVER, 0);
+ lv_obj_set_style_bg_color(press_gauge,
+ lv_palette_lighten(LV_PALETTE_RED, 4), 0);
+ lv_obj_set_style_radius(press_gauge, LV_RADIUS_CIRCLE, 0);
+ lv_obj_set_style_clip_corner(press_gauge, true, 0);
+ lv_obj_set_style_text_font(press_gauge, &lv_font_montserrat_24, 0);
+ lv_obj_align(press_gauge, LV_ALIGN_LEFT_MID, LV_PCT(5), 0);
+
+ lv_scale_set_label_show(press_gauge, true);
+
+ lv_scale_set_total_tick_count(press_gauge, (PRESS_MAX - PRESS_MIN));
+ lv_scale_set_major_tick_every(press_gauge, PRESS_MAJOR_TICKS_EVERY);
+
+ lv_obj_set_style_length(press_gauge, 5, LV_PART_ITEMS);
+ lv_obj_set_style_length(press_gauge, 10, LV_PART_INDICATOR);
+ lv_scale_set_range(press_gauge, PRESS_MIN, PRESS_MAX);
+
+ lv_scale_set_angle_range(press_gauge, 270);
+ lv_scale_set_rotation(press_gauge, 135);
+
+ press_line = lv_line_create(press_gauge);
+
+ lv_obj_set_style_line_width(press_line, LINE_WIDTH, LV_PART_MAIN);
+ lv_obj_set_style_line_rounded(press_line, true, LV_PART_MAIN);
+ lv_obj_set_style_line_color(press_line, lv_color_black(), LV_PART_MAIN);
+ lv_obj_center(press_line);
+
+ /* Temperature gauge */
+
+ temp_gauge = lv_scale_create(temp_cont);
+ lv_obj_set_size(temp_gauge, GAUGE_SIZE, GAUGE_SIZE);
+ lv_scale_set_label_show(temp_gauge, true);
+ lv_scale_set_mode(temp_gauge, LV_SCALE_MODE_ROUND_OUTER);
+ lv_obj_align(temp_gauge, LV_ALIGN_RIGHT_MID, LV_PCT(-5), 0);
+
+ lv_scale_set_total_tick_count(temp_gauge, (TEMP_MAX - TEMP_MIN));
+ lv_scale_set_major_tick_every(temp_gauge, TEMP_MAJOR_TICKS_EVERY);
+ lv_obj_set_style_length(temp_gauge, 5, LV_PART_ITEMS);
+ lv_obj_set_style_length(temp_gauge, 10, LV_PART_INDICATOR);
+ lv_scale_set_range(temp_gauge, TEMP_MIN, TEMP_MAX);
+
+ lv_scale_set_angle_range(temp_gauge, 270);
+ lv_scale_set_rotation(temp_gauge, 135);
+
+ temp_line = lv_line_create(temp_gauge);
+
+ lv_obj_set_style_line_width(temp_line, LINE_WIDTH, LV_PART_MAIN);
+ lv_obj_set_style_line_rounded(temp_line, true, LV_PART_MAIN);
+ lv_obj_center(temp_line);
+
+ /* Generate labels */
+
+ for (unsigned i = 0; i < NUM_TEMP_LABELS; i++)
+ {
+ snprintf(g_label_buf[i], sizeof(g_label_buf[i]), "%d °C",
+ TEMP_MIN + i * (TEMP_MAX - TEMP_MIN) / NUM_TEMP_LABELS);
+ g_temp_labels[i] = (const char *)g_label_buf[i];
+ }
+
+ g_temp_labels[NUM_TEMP_LABELS] = NULL;
+
+ lv_scale_set_text_src(temp_gauge, g_temp_labels);
+
+ /* Temp gauge styles */
+
+ lv_style_init(&indicator_style);
+
+ lv_style_set_text_font(&indicator_style, &lv_font_montserrat_24);
+ lv_style_set_text_color(&indicator_style,
+ lv_palette_darken(LV_PALETTE_BLUE, 3));
+
+ lv_style_set_line_color(&indicator_style,
+ lv_palette_darken(LV_PALETTE_BLUE, 3));
+ lv_style_set_width(&indicator_style, 10U); /* Tick length */
+ lv_style_set_line_width(&indicator_style, 2U); /* Tick width */
+ lv_obj_add_style(temp_gauge, &indicator_style, LV_PART_INDICATOR);
+
+ lv_style_init(&minor_ticks_style);
+ lv_style_set_line_color(&minor_ticks_style,
+ lv_palette_lighten(LV_PALETTE_BLUE, 2));
+ lv_style_set_width(&minor_ticks_style, 5U); /* Tick length */
+ lv_style_set_line_width(&minor_ticks_style, 2U); /* Tick width */
+ lv_obj_add_style(temp_gauge, &minor_ticks_style, LV_PART_ITEMS);
+
+ lv_style_init(&main_line_style);
+ lv_style_set_arc_color(&main_line_style,
+ lv_palette_darken(LV_PALETTE_BLUE, 3));
+ lv_style_set_arc_width(&main_line_style, 2U); /* Tick width */
+
+ /* Section on temperature gauge */
+
+ lv_style_init(§ion_label_style);
+ lv_style_init(§ion_minor_ticks_style);
+ lv_style_init(§ion_main_line_style);
+
+ lv_style_set_text_font(§ion_label_style, &lv_font_montserrat_24);
+ lv_style_set_text_color(§ion_label_style,
+ lv_palette_darken(LV_PALETTE_RED, 3));
+
+ lv_style_set_line_color(§ion_label_style,
+ lv_palette_darken(LV_PALETTE_RED, 3));
+ lv_style_set_line_width(§ion_label_style, 5U); /* Tick width */
+
+ lv_style_set_line_color(§ion_minor_ticks_style,
+ lv_palette_lighten(LV_PALETTE_RED, 2));
+ lv_style_set_line_width(§ion_minor_ticks_style, 4U); /* Tick width */
+
+ lv_style_set_arc_color(§ion_main_line_style,
+ lv_palette_darken(LV_PALETTE_RED, 3));
+ lv_style_set_arc_width(§ion_main_line_style, 4U); /* Tick width */
+
+ section = lv_scale_add_section(temp_gauge);
+ lv_scale_section_set_range(section, TEMP_THRESH, TEMP_MAX);
+ lv_scale_section_set_style(section, LV_PART_INDICATOR,
+ §ion_label_style);
+ lv_scale_section_set_style(section, LV_PART_ITEMS,
+ §ion_minor_ticks_style);
+ lv_scale_section_set_style(section, LV_PART_MAIN,
+ §ion_main_line_style);
+
+ /* Data labels */
+
+ press_label = lv_label_create(press_cont);
+ lv_obj_align(press_label, LV_ALIGN_CENTER, 0, 0);
+ lv_obj_set_style_text_font(press_label, &lv_font_montserrat_24, 0);
+ temp_label = lv_label_create(temp_cont);
+ lv_obj_align(temp_label, LV_ALIGN_CENTER, 0, 0);
+ lv_obj_set_style_text_font(temp_label, &lv_font_montserrat_24, 0);
+
+ /* Main loop */
+
+#ifdef CONFIG_LV_USE_NUTTX_LIBUV
+ lv_nuttx_uv_loop(&ui_loop, &result);
+#else
+ for (; ; )
+ {
+ err = read(fd, &sensor_data, sizeof(sensor_data));
+ if (err < 0)
+ {
+ fprintf(stderr, "Failed read data from %s: %d\n", topic, errno);
+ }
+ else if (err == 0)
+ {
+ fprintf(stderr, "No data from %s\n", topic);
+ }
+ else
+ {
+ got_data = true;
+ }
+
+ if (got_data)
+ {
+ /* Update display if we obtained it successfully */
+
+ lv_label_set_text_fmt(temp_label, "Temperature: %2.f °C",
+ sensor_data.temperature);
+ lv_label_set_text_fmt(press_label, "Pressure: %2.f mbar",
+ sensor_data.pressure);
+
+ lv_scale_set_line_needle_value(press_gauge, press_line, -10,
+ (int32_t)sensor_data.pressure);
+ lv_scale_set_line_needle_value(temp_gauge, temp_line, -10,
+ (int32_t)sensor_data.temperature);
+
+ if (sensor_data.temperature < TEMP_THRESH)
+ {
+ lv_obj_set_style_line_color(
+ temp_line, lv_palette_darken(LV_PALETTE_BLUE, 3),
+ LV_PART_MAIN);
+ }
+ else
+ {
+ lv_obj_set_style_line_color(
+ temp_line, lv_palette_darken(LV_PALETTE_RED, 3),
+ LV_PART_MAIN);
+ }
+
+ got_data = false; /* Reset for next loop */
+ }
+
+ lv_timer_handler();
+ usleep(CONFIG_EXAMPLES_BAROMONITOR_SAMPLERATE * 1000);
+
+ /* TODO: make this equivalent in LIBUV loop */
+ }
+#endif
+
+ orb_close(fd);
+ lv_nuttx_deinit(&result);
+ lv_deinit();
+ return EXIT_SUCCESS;
+}
