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Add display invert setting for e-paper displays #1289

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Add display invert setting for e-paper displays #1289

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@Hacuchino-hash Hacuchino-hash commented Dec 30, 2025

Summary

  • Adds a toggle to invert the display colors (white on black instead of black on white)
  • The setting persists across reboots
  • Adds invert_display preference to NodePrefs
  • Adds INVERT page to home screen (after ADVERT) with toggle
  • Updates GxEPDDisplay to respect inversion state for colors and background

Test plan

  • Tested on LilyGo T-Echo with companion_radio_ble firmware
  • Verified display inverts correctly when toggled
  • Verified setting persists after reboot
  • Verified logo and text render correctly in both modes

@Hacuchino-hash
Add display invert setting for e-paper displays
281dda1 
Adds a toggle to invert the display colors (white on black instead of
black on white). The setting persists across reboots.

- Add invert_display preference to NodePrefs
- Add INVERT page to home screen (after ADVERT) with toggle
- Update GxEPDDisplay to respect inversion state for colors and background
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