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examples/baromonitor: New LVGL example which integrates with barometer

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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 <matteo.golin@gmail.com>
This commit is contained in:
Matteo Golin 2026-06-22 20:49:27 -04:00 • committed by Xiang Xiao
parent 09682dad05
commit 5114ddd6c0
5 changed files with 553 additions and 0 deletions
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35
examples/baromonitor/CMakeLists.txt Normal file
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# ##############################################################################
# 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()

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examples/baromonitor/Kconfig Normal file
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#
# 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

25
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############################################################################
# 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

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examples/baromonitor/Makefile Normal file
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############################################################################
# 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

419
examples/baromonitor/baromonitor_main.c Normal file
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/****************************************************************************
* 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(&section_label_style);
lv_style_init(&section_minor_ticks_style);
lv_style_init(&section_main_line_style);
lv_style_set_text_font(&section_label_style, &lv_font_montserrat_24);
lv_style_set_text_color(&section_label_style,
lv_palette_darken(LV_PALETTE_RED, 3));
lv_style_set_line_color(&section_label_style,
lv_palette_darken(LV_PALETTE_RED, 3));
lv_style_set_line_width(&section_label_style, 5U); /* Tick width */
lv_style_set_line_color(&section_minor_ticks_style,
lv_palette_lighten(LV_PALETTE_RED, 2));
lv_style_set_line_width(&section_minor_ticks_style, 4U); /* Tick width */
lv_style_set_arc_color(&section_main_line_style,
lv_palette_darken(LV_PALETTE_RED, 3));
lv_style_set_arc_width(&section_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,
&section_label_style);
lv_scale_section_set_style(section, LV_PART_ITEMS,
&section_minor_ticks_style);
lv_scale_section_set_style(section, LV_PART_MAIN,
&section_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;
}