examples/calculator: Add an LVGL touchscreen calculator. - #3660
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Add a standalone calculator with touch input and cooperative shutdown. Initialize the board through BOARDIOC_FINALINIT. Assisted-by: OpenAI Codex:gpt-5.6-sol Signed-off-by: aviralgarg05 <gargaviral99@gmail.com>
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🔗 Cross-repo PR dependenciesThe read-only Build run reported the following dependent PR(s) and fetched head SHA(s): CI run: https://github.com/apache/nuttx-apps/actions/runs/31882801968 |
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Note: Please adhere to Contributing Guidelines.
Depends-On: /pull/3643
Summary
A touchscreen board had no small graphical application to exercise the
display and input path with, and nothing that demonstrated an application
cooperating with a supervisor.
This adds an LVGL calculator: the usual four operations, a display that
handles division by zero and overflow rather than showing a wrong result,
and a layout that scales to the framebuffer it finds. It exits cleanly when
asked to, so it can be started and closed repeatedly without leaking the
framebuffer.
The diff previously carried the commits it was branched from; it now
contains only the calculator.
Impact
Testing
Build host: macOS 26.5, arm64,
xtensa-esp-elf-gcc 14.2.0(
esp-14.2.0_20251107).Target: Xtensa / ESP32-S3, Waveshare ESP32-S3-Touch-LCD-7, 800x480 RGB565
with a GT911 touchscreen.
nxstyle,tools/checkpatch.sh,codespellandgit diff --checkand the application started and closed several times with no leftover
task afterwards
It uses
include/system/nxstore_chrome.h, so it does not build onmasteralone; the
Depends-Online above lets CI apply that first.PR verification Self-Check