Month: 2025-08 — Key bug fix in lvgl/lvgl: corrected textarea selection highlight calculation to account for letter spacing, ensuring the selection background spans the intended area. Added automated test to verify the fix and prevent regressions. Commit reference: 6c2263fb8728caaf1e4ce49fafba4a8292336795 (fix(textarea): fill letter space with selection bg color. (#8238)).

Month: 2025-07 — lvgl/lvgl: Implemented a critical UI/UX bug fix for textarea resize behavior and added regression tests. The fix ensures the textarea label scrolls to the cursor position when its size changes by introducing lv_textarea_scroll_to_cusor_pos and invoking it on resize. This work, tied to commit 6ef2e5efd57d94d7ff8b8e0dd01eddf6edf6322b, directly addresses #8548 and improves editing accuracy, user experience, and UI stability.

Month: 2025-04 Overview: Delivered critical UI and hardware support improvements for the apache/nuttx repo, focusing on display performance, expanded MCU/board compatibility, and touch reliability. The work enhances end-user experience on STM32H7/H750 platforms and strengthens cross-board portability and LVGL readiness. Key features delivered: - STM32H7 LTDC layer 1 double buffering: introduced two framebuffers for flicker-free display updates, with a Kconfig option and adjusted framebuffer calculations for LTDC layer 1. Committers: c4b81bb92221f696aaf335c343e8aa14f0d317e1; 32c5667d5d8a536cc59480f82039b5ad934d2ce8. Additional optimization to ensure compatibility across boards. - STM32H750B MCU/board support (DK) and LVGL runtime: added support for stm32h750b-dk board, including memory/flash configuration and LVGL runtime initialization; and updated stm32h7 compilation/config options to enable stm32h750. Committers: c309c452d64954b3a4967d2bdc0340f3bb50dc36; e421e2c9e585c9f423b557420bc4b20acdc49adc. Major bugs fixed: - FT5x06 touch input sampling bug fix: corrected Y-axis delta evaluation by switching delta check from deltax to deltay to properly detect Y movement. Commit: c9fd44a0eca1564f1ece9c2918b755fa4c2f180d. Overall impact and accomplishments: - Improved user experience with flicker-free LTDC rendering on STM32H7 platforms, enabling smoother UI transitions and more reliable visuals in embedded displays. - Expanded hardware support with STM32H750B-DK, enabling faster adoption for development kits and LVGL-driven interfaces; improved portability across STM32H7 boards. - Stabilized touch interaction on FT5x06-based devices, reducing erroneous input and improving reliability of touch-driven UIs. Technologies/skills demonstrated: - Embedded C/_HAL integration for STM32 microcontrollers, LTDC display pipeline, and double buffering techniques - Kconfig-driven feature flags and cross-board framebuffer calculations - LVGL runtime integration and board initialization for new hardware - Board and arch configuration, including memory/flash setup and compilation options - Debugging and validation of input devices (FT5x06) and touch input sampling