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The following commit(s) were added to refs/heads/master by this push:
new 44d1f6c05 examples/calculator: add an LVGL touchscreen calculator
44d1f6c05 is described below
commit 44d1f6c05a57ebd936642dd8127d2d3542f1e2fb
Author: aviralgarg05 <[email protected]>
AuthorDate: Sat Aug 15 16:03:16 2026 +0530
examples/calculator: add an LVGL touchscreen calculator
Add a touchscreen calculator with cooperative shutdown and board
initialization through BOARDIOC_FINALINIT.
Signed-off-by: aviralgarg05 <[email protected]>
---
examples/calculator/CMakeLists.txt | 37 +++
examples/calculator/Kconfig | 43 +++
examples/calculator/Make.defs | 25 ++
examples/calculator/Makefile | 32 +++
examples/calculator/calculator_main.c | 488 ++++++++++++++++++++++++++++++++++
5 files changed, 625 insertions(+)
diff --git a/examples/calculator/CMakeLists.txt
b/examples/calculator/CMakeLists.txt
new file mode 100644
index 000000000..6f26ffea9
--- /dev/null
+++ b/examples/calculator/CMakeLists.txt
@@ -0,0 +1,37 @@
+#
##############################################################################
+# apps/examples/calculator/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_CALCULATOR)
+ nuttx_add_application(
+ NAME
+ calc
+ PRIORITY
+ ${CONFIG_EXAMPLES_CALCULATOR_PRIORITY}
+ STACKSIZE
+ ${CONFIG_EXAMPLES_CALCULATOR_STACKSIZE}
+ MODULE
+ ${CONFIG_EXAMPLES_CALCULATOR}
+ DEPENDS
+ lvgl
+ SRCS
+ calculator_main.c)
+endif()
diff --git a/examples/calculator/Kconfig b/examples/calculator/Kconfig
new file mode 100644
index 000000000..8cb47a064
--- /dev/null
+++ b/examples/calculator/Kconfig
@@ -0,0 +1,43 @@
+#
+# For a description of the syntax of this configuration file,
+# see the file kconfig-language.txt in the NuttX tools repository.
+#
+
+menuconfig EXAMPLES_CALCULATOR
+ tristate "Calculator"
+ default n
+ depends on GRAPHICS_LVGL && INPUT_TOUCHSCREEN
+ select LV_FONT_MONTSERRAT_20
+ ---help---
+ Enable the simple LVGL touchscreen calculator example.
+
+if EXAMPLES_CALCULATOR
+
+config EXAMPLES_CALCULATOR_PRIORITY
+ int "calculator task priority"
+ default 100
+
+config EXAMPLES_CALCULATOR_STACKSIZE
+ int "calculator stack size"
+ default 16384
+
+config EXAMPLES_CALCULATOR_INPUT_DEVPATH
+ string "Touchscreen device path"
+ default "/dev/input0"
+ ---help---
+ The path to the touchscreen device. Default: "/dev/input0"
+
+config EXAMPLES_CALCULATOR_FB_DEVPATH
+ string "Framebuffer device path"
+ default "/dev/fb0"
+ ---help---
+ The path to the framebuffer device. Default: "/dev/fb0"
+
+config EXAMPLES_CALCULATOR_YOFFSET
+ int "Top screen offset"
+ default 0
+ ---help---
+ Rows to leave unused at the top of the display. Set this to the
+ height of any supervisor bar shown above the calculator.
+
+endif # EXAMPLES_CALCULATOR
diff --git a/examples/calculator/Make.defs b/examples/calculator/Make.defs
new file mode 100644
index 000000000..d9a1de446
--- /dev/null
+++ b/examples/calculator/Make.defs
@@ -0,0 +1,25 @@
+############################################################################
+# apps/examples/calculator/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_CALCULATOR),)
+CONFIGURED_APPS += $(APPDIR)/examples/calculator
+endif
diff --git a/examples/calculator/Makefile b/examples/calculator/Makefile
new file mode 100644
index 000000000..cd19d62bb
--- /dev/null
+++ b/examples/calculator/Makefile
@@ -0,0 +1,32 @@
+############################################################################
+# apps/examples/calculator/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
+
+PROGNAME = calc
+PRIORITY = $(CONFIG_EXAMPLES_CALCULATOR_PRIORITY)
+STACKSIZE = $(CONFIG_EXAMPLES_CALCULATOR_STACKSIZE)
+MODULE = $(CONFIG_EXAMPLES_CALCULATOR)
+
+MAINSRC = calculator_main.c
+
+include $(APPDIR)/Application.mk
diff --git a/examples/calculator/calculator_main.c
b/examples/calculator/calculator_main.c
new file mode 100644
index 000000000..fae587dc4
--- /dev/null
+++ b/examples/calculator/calculator_main.c
@@ -0,0 +1,488 @@
+/****************************************************************************
+ * apps/examples/calculator/calculator_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 <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/boardctl.h>
+
+#include <lvgl/lvgl.h>
+
+#define CALC_DISPLAY_MAX 16
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+/* Polled by the main loop for cooperative shutdown. */
+
+static volatile sig_atomic_t g_quit_requested;
+
+static lv_obj_t *g_display;
+static char g_display_buf[CALC_DISPLAY_MAX + 1] = "0";
+static double g_accumulator;
+static char g_pending_op;
+static bool g_start_new_entry = true;
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+static void quit_signal_handler(int signo)
+{
+ (void)signo;
+ g_quit_requested = 1;
+}
+
+/* Let standalone launches exit without an external SIGTERM. */
+
+static void close_event_cb(lv_event_t *e)
+{
+ UNUSED(e);
+ g_quit_requested = 1;
+}
+
+static void calc_update_display(void)
+{
+ lv_label_set_text(g_display, g_display_buf);
+}
+
+static void calc_set_display_number(double value)
+{
+ snprintf(g_display_buf, sizeof(g_display_buf), "%.10g", value);
+ calc_update_display();
+}
+
+static double calc_apply(double a, double b, char op, bool *ok)
+{
+ *ok = true;
+
+ switch (op)
+ {
+ case '+':
+ return a + b;
+
+ case '-':
+ return a - b;
+
+ case '*':
+ return a * b;
+
+ case '/':
+ if (b == 0)
+ {
+ *ok = false;
+ return 0;
+ }
+
+ return a / b;
+
+ default:
+ return b;
+ }
+}
+
+static void calc_clear(void)
+{
+ g_accumulator = 0;
+ g_pending_op = 0;
+ g_start_new_entry = true;
+ snprintf(g_display_buf, sizeof(g_display_buf), "0");
+ calc_update_display();
+}
+
+static void calc_handle_digit(char digit)
+{
+ size_t len;
+
+ if (g_start_new_entry)
+ {
+ g_display_buf[0] = '\0';
+ g_start_new_entry = false;
+ }
+
+ if (strcmp(g_display_buf, "0") == 0)
+ {
+ g_display_buf[0] = '\0';
+ }
+
+ len = strlen(g_display_buf);
+ if (len + 1 >= sizeof(g_display_buf))
+ {
+ /* Ignore digits that do not fit. */
+
+ return;
+ }
+
+ g_display_buf[len] = digit;
+ g_display_buf[len + 1] = '\0';
+ calc_update_display();
+}
+
+static void calc_handle_point(void)
+{
+ size_t len;
+
+ if (g_start_new_entry)
+ {
+ snprintf(g_display_buf, sizeof(g_display_buf), "0");
+ g_start_new_entry = false;
+ }
+
+ if (strchr(g_display_buf, '.') != NULL)
+ {
+ return;
+ }
+
+ len = strlen(g_display_buf);
+ if (len + 1 >= sizeof(g_display_buf))
+ {
+ return;
+ }
+
+ g_display_buf[len] = '.';
+ g_display_buf[len + 1] = '\0';
+ calc_update_display();
+}
+
+static void calc_handle_op(char op)
+{
+ double current = atof(g_display_buf);
+ bool ok;
+
+ if (g_pending_op != 0)
+ {
+ g_accumulator = calc_apply(g_accumulator, current, g_pending_op, &ok);
+ if (!ok)
+ {
+ snprintf(g_display_buf, sizeof(g_display_buf), "Error");
+ calc_update_display();
+ g_pending_op = 0;
+ g_start_new_entry = true;
+ return;
+ }
+ }
+ else
+ {
+ g_accumulator = current;
+ }
+
+ g_pending_op = op;
+ g_start_new_entry = true;
+ calc_set_display_number(g_accumulator);
+}
+
+static void calc_handle_equals(void)
+{
+ double current = atof(g_display_buf);
+ bool ok;
+
+ if (g_pending_op == 0)
+ {
+ g_accumulator = current;
+ }
+ else
+ {
+ g_accumulator = calc_apply(g_accumulator, current, g_pending_op, &ok);
+ if (!ok)
+ {
+ snprintf(g_display_buf, sizeof(g_display_buf), "Error");
+ calc_update_display();
+ g_pending_op = 0;
+ g_start_new_entry = true;
+ return;
+ }
+ }
+
+ g_pending_op = 0;
+ g_start_new_entry = true;
+ calc_set_display_number(g_accumulator);
+}
+
+static void button_event_cb(lv_event_t *e)
+{
+ FAR const char *code = lv_event_get_user_data(e);
+
+ switch (code[0])
+ {
+ case 'C':
+ calc_clear();
+ break;
+
+ case '.':
+ calc_handle_point();
+ break;
+
+ case '=':
+ calc_handle_equals();
+ break;
+
+ case '+':
+ case '-':
+ case '*':
+ case '/':
+ calc_handle_op(code[0]);
+ break;
+
+ default:
+ calc_handle_digit(code[0]);
+ break;
+ }
+}
+
+static lv_obj_t *make_button(lv_obj_t *parent, FAR const char *label,
+ FAR const char *code, uint32_t color)
+{
+ lv_obj_t *btn;
+ lv_obj_t *btn_label;
+
+ btn = lv_obj_create(parent);
+ lv_obj_set_style_radius(btn, 10, 0);
+ lv_obj_set_style_bg_color(btn, lv_color_hex(color), 0);
+ lv_obj_set_style_bg_color(btn, lv_color_hex(0xffffff),
+ LV_STATE_PRESSED);
+ lv_obj_set_style_bg_opa(btn, LV_OPA_30, LV_STATE_PRESSED);
+ lv_obj_set_style_border_width(btn, 0, 0);
+ lv_obj_clear_flag(btn, LV_OBJ_FLAG_SCROLLABLE);
+ lv_obj_add_flag(btn, LV_OBJ_FLAG_CLICKABLE);
+
+ btn_label = lv_label_create(btn);
+ lv_label_set_text(btn_label, label);
+ lv_obj_set_style_text_color(btn_label, lv_color_hex(0xffffff), 0);
+ lv_obj_center(btn_label);
+
+ lv_obj_add_event_cb(btn, button_event_cb, LV_EVENT_CLICKED,
+ (void *)code);
+
+ return btn;
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+int main(int argc, FAR char *argv[])
+{
+ lv_nuttx_dsc_t info;
+ lv_nuttx_result_t result;
+ lv_obj_t *screen;
+ lv_obj_t *grid;
+ lv_obj_t *close_btn;
+ lv_obj_t *close_label;
+ struct sigaction sa;
+ int32_t display_height;
+ int32_t display_width;
+ static const char *const keys[5][4] =
+ {
+ { "7", "8", "9", "/" },
+ { "4", "5", "6", "*" },
+ { "1", "2", "3", "-" },
+ { "C", "0", ".", "+" },
+ { "=", "=", "=", "=" },
+ };
+
+ static const int32_t col_dsc[] =
+ {
+ LV_GRID_FR(1), LV_GRID_FR(1), LV_GRID_FR(1), LV_GRID_FR(1),
+ LV_GRID_TEMPLATE_LAST
+ };
+
+ static const int32_t row_dsc[] =
+ {
+ LV_GRID_FR(1), LV_GRID_FR(1), LV_GRID_FR(1), LV_GRID_FR(1),
+ LV_GRID_FR(1), LV_GRID_TEMPLATE_LAST
+ };
+
+ g_quit_requested = 0;
+ g_display_buf[0] = '0';
+ g_display_buf[1] = '\0';
+ g_accumulator = 0;
+ g_pending_op = 0;
+ g_start_new_entry = true;
+
+ memset(&sa, 0, sizeof(sa));
+ sa.sa_handler = quit_signal_handler;
+ sigemptyset(&sa.sa_mask);
+ if (sigaction(SIGTERM, &sa, NULL) < 0)
+ {
+ LV_LOG_ERROR("calculator: failed to install SIGTERM handler");
+ return 1;
+ }
+
+ if (lv_is_initialized())
+ {
+ LV_LOG_ERROR("LVGL already initialized! aborting.");
+ return -1;
+ }
+
+#ifdef CONFIG_BOARDCTL_FINALINIT
+ boardctl(BOARDIOC_FINALINIT, 0);
+#endif
+
+ lv_init();
+
+ lv_nuttx_dsc_init(&info);
+ info.fb_path = CONFIG_EXAMPLES_CALCULATOR_FB_DEVPATH;
+ info.input_path = CONFIG_EXAMPLES_CALCULATOR_INPUT_DEVPATH;
+
+ lv_nuttx_init(&info, &result);
+
+ if (result.disp == NULL)
+ {
+ LV_LOG_ERROR("calculator: LVGL display init failed!");
+ lv_nuttx_deinit(&result);
+ lv_deinit();
+ return 1;
+ }
+
+ if (result.indev == NULL)
+ {
+ LV_LOG_ERROR("calculator: touchscreen init failed!");
+ lv_nuttx_deinit(&result);
+ lv_deinit();
+ return 1;
+ }
+
+ display_width = lv_display_get_horizontal_resolution(result.disp);
+ display_height = lv_display_get_vertical_resolution(result.disp);
+ if (display_width <= 0 ||
+ display_height <= CONFIG_EXAMPLES_CALCULATOR_YOFFSET)
+ {
+ LV_LOG_ERROR("calculator: display is too small");
+ lv_nuttx_deinit(&result);
+ lv_deinit();
+ return 1;
+ }
+
+ screen = lv_obj_create(NULL);
+ lv_obj_set_size(screen, display_width,
+ display_height - CONFIG_EXAMPLES_CALCULATOR_YOFFSET);
+ lv_obj_set_pos(screen, 0, CONFIG_EXAMPLES_CALCULATOR_YOFFSET);
+ lv_obj_set_style_bg_color(screen, lv_color_hex(0x101827), 0);
+ lv_obj_set_style_border_width(screen, 0, 0);
+ lv_obj_clear_flag(screen, LV_OBJ_FLAG_SCROLLABLE);
+
+ g_display = lv_label_create(screen);
+ lv_obj_set_width(g_display, LV_PCT(90));
+ lv_obj_set_style_text_font(g_display, &lv_font_montserrat_20, 0);
+ lv_obj_set_style_text_color(g_display, lv_color_hex(0xffffff), 0);
+ lv_obj_set_style_text_align(g_display, LV_TEXT_ALIGN_RIGHT, 0);
+ lv_label_set_text(g_display, g_display_buf);
+ lv_obj_align(g_display, LV_ALIGN_TOP_MID, 0, 48);
+
+ close_btn = lv_obj_create(screen);
+ lv_obj_set_size(close_btn, 36, 36);
+ lv_obj_align(close_btn, LV_ALIGN_TOP_RIGHT, -8, 8);
+ lv_obj_set_style_radius(close_btn, 8, 0);
+ lv_obj_set_style_bg_color(close_btn, lv_color_hex(0xf0554c), 0);
+ lv_obj_set_style_bg_color(close_btn, lv_color_hex(0xb03830),
+ LV_STATE_PRESSED);
+ lv_obj_set_style_border_width(close_btn, 0, 0);
+ lv_obj_clear_flag(close_btn, LV_OBJ_FLAG_SCROLLABLE);
+ lv_obj_add_flag(close_btn, LV_OBJ_FLAG_CLICKABLE);
+
+ close_label = lv_label_create(close_btn);
+ lv_label_set_text(close_label, LV_SYMBOL_CLOSE);
+ lv_obj_set_style_text_color(close_label, lv_color_hex(0xffffff), 0);
+ lv_obj_clear_flag(close_label, LV_OBJ_FLAG_CLICKABLE);
+ lv_obj_center(close_label);
+
+ lv_obj_add_event_cb(close_btn, close_event_cb, LV_EVENT_CLICKED, NULL);
+
+ grid = lv_obj_create(screen);
+ lv_obj_set_size(grid, LV_PCT(90), LV_PCT(70));
+ lv_obj_align(grid, LV_ALIGN_BOTTOM_MID, 0, -16);
+ lv_obj_set_style_bg_opa(grid, LV_OPA_TRANSP, 0);
+ lv_obj_set_style_border_width(grid, 0, 0);
+ lv_obj_set_style_pad_all(grid, 4, 0);
+ lv_obj_set_style_pad_gap(grid, 8, 0);
+ lv_obj_clear_flag(grid, LV_OBJ_FLAG_SCROLLABLE);
+ lv_obj_set_grid_dsc_array(grid, col_dsc, row_dsc);
+ lv_obj_set_layout(grid, LV_LAYOUT_GRID);
+
+ for (int row = 0; row < 5; row++)
+ {
+ for (int col = 0; col < 4; col++)
+ {
+ FAR const char *code = keys[row][col];
+ uint32_t color = 0x2a3648;
+ lv_obj_t *btn;
+
+ if (row == 4)
+ {
+ /* Create the full-width button once. */
+
+ if (col > 0)
+ {
+ continue;
+ }
+ }
+
+ if (strchr("+-*/=", code[0]) != NULL)
+ {
+ color = 0x3d8bff;
+ }
+ else if (code[0] == 'C')
+ {
+ color = 0xf0554c;
+ }
+
+ btn = make_button(grid, code, code, color);
+ if (row == 4)
+ {
+ lv_obj_set_grid_cell(btn, LV_GRID_ALIGN_STRETCH, 0, 4,
+ LV_GRID_ALIGN_STRETCH, row, 1);
+ }
+ else
+ {
+ lv_obj_set_grid_cell(btn, LV_GRID_ALIGN_STRETCH, col, 1,
+ LV_GRID_ALIGN_STRETCH, row, 1);
+ }
+ }
+ }
+
+ lv_screen_load(screen);
+
+ while (!g_quit_requested)
+ {
+ uint32_t idle;
+
+ idle = lv_timer_handler();
+
+ /* Minimum sleep of 1ms */
+
+ idle = idle ? idle : 1;
+ usleep(idle * 1000);
+ }
+
+ lv_nuttx_deinit(&result);
+ lv_deinit();
+
+ return 0;
+}
