A major update to the app system - V2.0.0

fOS v2.0.0 Release Notes

Release date: 2026-05-08

Highlights

fOS 2.0.0 is a major app-system upgrade:

• dynamic SD apps on 6 launcher tiles
• unloadable app runtime to reduce memory pressure
• new built-in app types: calculator and radio
• root-based storage navigation with parent-folder support

Added

• SD App Launcher capacity increased to 6 apps (AppL1 to AppL6).
• New app type: calculator
  • +, -, *, /
  • decimal comma input
  • Math Error on division by zero
• New app type: radio
  • local file playback from /music/files/
  • web radio playback from /music/webradio/webradio.txt
  • Start/Stop toggle button
• New filesystem navigation flow in Storage Manager:
  • starts at /
  • folder enter via StorageManagerSelect()
  • .. to go to parent folder
• New and updated example app package entries:
  • hello_fos
  • button_demo
  • ebook_demo
  • ui_demo
  • calculator_demo
  • radio_demo

Changed

• App content now runs as a dedicated runtime scene in uic_AppContentArea.
• UnloadApp() now actively clears app runtime objects and reloads launcher state.
• SD app default type is now ui (with layout.ui support).
• Launcher tiles now support optional icon= metadata in app.cfg.
• SD init now ensures /music/webradio exists.

Removed / Reworked

• Legacy fixed UI handlers tied to old calculator/weather/radio screens were removed or replaced by app-runtime implementations.
• App rendering is now centered around SD app metadata and app type dispatch.

SD App Metadata (Current)

Supported app.cfg keys in 2.0.0:

• name
• icon
• type=ui|text|button|calculator|radio
• scrollable
• layout (for type=ui)
• content (for type=text)
• button_text, button_message (for type=button)

Compatibility Notes

• Existing type=text and type=button SD apps remain supported.
• For web radio, station lines must be Sender|URL in /music/webradio/webradio.txt.
• Recommended SD format remains FAT32 (MBR preferred).

Known Limitations

• App launcher renders up to 6 app directories from /apps (first 6 discovered).
• Stream reliability depends on station format/codec and network quality.
• No in-app persisted calculator history in this release.