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examples/calculator: Add an LVGL touchscreen calculator.
Add a calculator example that can run as either a built-in application or loadable module. It uses configurable framebuffer and touchscreen paths, reserves the nxstore supervisor bar, and exits cooperatively on SIGTERM. Validate display, touchscreen, and signal-handler setup before entering the LVGL loop. Reset static state on every invocation so built-in relaunches behave like fresh module loads. Assisted-by: OpenAI Codex:gpt-5.6-sol Signed-off-by: aviralgarg05 <gargaviral99@gmail.com>
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‎examples/calculator/CMakeLists.txt‎

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# ##############################################################################
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# apps/examples/calculator/CMakeLists.txt
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#
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# SPDX-License-Identifier: Apache-2.0
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#
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# Licensed to the Apache Software Foundation (ASF) under one or more contributor
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# license agreements. See the NOTICE file distributed with this work for
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# additional information regarding copyright ownership. The ASF licenses this
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# file to you under the Apache License, Version 2.0 (the "License"); you may not
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# use this file except in compliance with the License. You may obtain a copy of
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# the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations under
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# the License.
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#
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# ##############################################################################
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if(CONFIG_EXAMPLES_CALCULATOR)
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nuttx_add_application(
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NAME
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calc
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PRIORITY
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${CONFIG_EXAMPLES_CALCULATOR_PRIORITY}
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STACKSIZE
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${CONFIG_EXAMPLES_CALCULATOR_STACKSIZE}
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MODULE
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${CONFIG_EXAMPLES_CALCULATOR}
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DEPENDS
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lvgl
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SRCS
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calculator_main.c)
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endif()

‎examples/calculator/Kconfig‎

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#
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# For a description of the syntax of this configuration file,
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# see the file kconfig-language.txt in the NuttX tools repository.
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#
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menuconfig EXAMPLES_CALCULATOR
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tristate "Calculator"
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default n
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depends on GRAPHICS_LVGL && INPUT_TOUCHSCREEN
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---help---
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Enable the simple LVGL touchscreen calculator example.
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if EXAMPLES_CALCULATOR
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config EXAMPLES_CALCULATOR_PRIORITY
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int "calculator task priority"
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default 100
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config EXAMPLES_CALCULATOR_STACKSIZE
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int "calculator stack size"
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default 16384
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config EXAMPLES_CALCULATOR_INPUT_DEVPATH
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string "Touchscreen device path"
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default "/dev/input0"
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---help---
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The path to the touchscreen device. Default: "/dev/input0"
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config EXAMPLES_CALCULATOR_FBDEVPATH
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string "Framebuffer device path"
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default "/dev/fb0"
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---help---
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The path to the framebuffer device. Default: "/dev/fb0"
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endif # EXAMPLES_CALCULATOR

‎examples/calculator/Make.defs‎

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############################################################################
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# apps/examples/calculator/Make.defs
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#
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# SPDX-License-Identifier: Apache-2.0
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#
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# Licensed to the Apache Software Foundation (ASF) under one or more
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# contributor license agreements. See the NOTICE file distributed with
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# this work for additional information regarding copyright ownership. The
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# ASF licenses this file to you under the Apache License, Version 2.0 (the
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# "License"); you may not use this file except in compliance with the
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# License. You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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#
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############################################################################
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ifneq ($(CONFIG_EXAMPLES_CALCULATOR),)
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CONFIGURED_APPS += $(APPDIR)/examples/calculator
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endif

‎examples/calculator/Makefile‎

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############################################################################
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# apps/examples/calculator/Makefile
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#
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# SPDX-License-Identifier: Apache-2.0
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#
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# Licensed to the Apache Software Foundation (ASF) under one or more
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# contributor license agreements. See the NOTICE file distributed with
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# this work for additional information regarding copyright ownership. The
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# ASF licenses this file to you under the Apache License, Version 2.0 (the
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# "License"); you may not use this file except in compliance with the
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# License. You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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#
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############################################################################
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include $(APPDIR)/Make.defs
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PROGNAME = calc
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PRIORITY = $(CONFIG_EXAMPLES_CALCULATOR_PRIORITY)
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STACKSIZE = $(CONFIG_EXAMPLES_CALCULATOR_STACKSIZE)
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MODULE = $(CONFIG_EXAMPLES_CALCULATOR)
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MAINSRC = calculator_main.c
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include $(APPDIR)/Application.mk

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