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Tactility/Documentation/ideas.md
Ken Van Hoeylandt bf91e7530d
Time & date, system events and much more (#152) 
## Time & Date
- Added time to statusbar widget
- Added Time & Date Settings app
- Added TimeZone app for selecting TimeZone
- Added `tt::time` namespace with timezone code

## Other changes

- Added `SystemEvent` to publish/subscribe to system wide (e.g. for init code, but also for time settings changes)
- Changed the way the statusbar widget works: now there's only 1 that gets shown/hidden, instead of 1 instance per app instance.
- Moved `lowercase()` function to new namespace: `tt::string`
- Increased T-Deck flash & PSRAM SPI frequencies to 120 MHz (from 80 MHz)
- Temporary work-around (+ TODO item) for LVGL stack size (issue with WiFi app)
- Suppress T-Deck keystroke debugging to debug level (privacy issue)
- Improved SDL dependency wiring in various `CMakeLists.txt`
- `Loader` service had some variables renamed to the newer C++ style (from previous C style)
2025-01-10 23:44:32 +01:00

4.7 KiB
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Issues

  • WiFi bug: when pressing disconnect while between WIFI_EVENT_STA_START and IP_EVENT_STA_GOT_IP, then auto-connect becomes active again.
  • ESP32 (CYD) memory issues (or any device without PSRAM):
    • Boot app doesn't show logo
    • WiFi is on and navigating back to Desktop makes desktop icons disappear
    • WiFi might fail quietly when trying to enable it: this shows no feedback (force it by increasing LVGL buffers to 100kB) Possible mitigations:
    • When no PSRAM is available, use simplified desktop buttons
    • Add statusbar icon for memory pressure.
    • Show error in WiFi screen (e.g. AlertDialog when SPI is not enabled and available memory is below a certain amount)
  • Clean up static_cast when casting to base class.
  • M5Stack CoreS3 SD card mounts, but cannot be read. There is currently a notice about it here.
  • EventFlag: Fix return value of set/get/wait (the errors are weirdly mixed in)
  • Consistently use either ESP_TARGET or ESP_PLATFORM
  • tt_check() failure during app argument bundle nullptr check seems to trigger SIGSEGV
  • Fix bug in T-Deck/etc: esp_lvgl_port settings has a large stack depth (~9kB) to fix an issue where the T-Deck would get a stackoverflow. This sometimes happens when WiFi is auto-enabled and you open the app while it is still connecting.

TODOs

  • Try to fix SDL pipeline issue with apt-get: 
    - name: Install SDL
  run: sudo apt-get install -y libsdl2-dev cmake
  • Make "blocking" argument the last one, and put it default to false (or remove it entirely?): void startApp(const std::string& id, bool blocking, std::shared_ptr parameters) {
  • Boot hooks instead of a single boot method in config. Define different boot phases/levels in enum.
  • Add toggle to Display app for sysmon overlay: https://docs.lvgl.io/master/API/others/sysmon/index.html
  • CrashHandler: use "corrupted" flag
  • CrashHandler: process other types of crashes (WDT?)
  • Call tt::lvgl::isSyncSet after HAL init and show error (and crash?) when it is not set.
  • Create different partitions files for different ESP flash size targets (N4, N8, N16, N32)
  • Attach ELF data to wrapper app (as app data) (check that app state is "running"!) so you can run more than 1 external apps at a time. We'll need to keep track of all manifest instances, so that the wrapper can look up the relevant manifest for the relevant callbacks.
  • T-Deck: Clear screen before turning on blacklight
  • Audio player app
  • Audio recording app
  • T-Deck: Use knob for UI selection
  • Crash monitoring: Keep track of which system phase the app crashed in (e.g. which app in which state)
  • AppContext's onResult should pass the app id (or launch request id!) that was started, so we can differentiate between multiple types of apps being launched
  • Loader: Use main dispatcher instead of Thread
  • Create more unit tests for tactility-core and tactility (PC-only for now)
  • Show a warning screen if firmware encryption or secure boot are off when saving WiFi credentials.
  • Show a warning screen when a user plugs in the SD card on a device that only supports mounting at boot.
  • Localisation of texts (load in boot app from sd?)
  • Explore LVGL9's FreeRTOS functionality
  • External app loading: Check version of Tactility and check ESP target hardware, to check for compatibility.
  • Scanning SD card for external apps and auto-register them (in a temporary register?)
  • tt::app::start() and similar functions as proxies for Loader app start/stop/etc.
  • Support hot-plugging SD card

Nice-to-haves

  • OTA updates
  • Web flasher
  • T-Deck Plus: Create separate board config?
  • Support for displays with different DPI. Consider the layer-based system like on Android.
  • Make firmwares available via web serial website
  • If present, use LED to show boot/wifi status
  • T-Deck Power: capacity estimation uses linear voltage curve, but it should use some sort of battery discharge curve.
  • Statusbar widget to show how much memory is in use?
  • Wrapper for Slider that shows "+" and "-" buttons, and also the value in a label.
  • Display app: Add toggle to display performance measurement overlay (consider showing FPS in statusbar!)
  • Files app: copy/paste actions
  • On crash, try to save current log to flash or SD card? (this is risky, though, so ask in Discord first)

App Ideas

  • USB implementation to make device act as mass storage device.
  • System logger
  • BlueTooth keyboard app
  • Chip 8 emulator
  • BadUSB (in December 2024, TinyUSB has a bug where uninstalling and re-installing the driver fails)
  • Discord bot
  • IR transceiver app
  • GPS app
  • Investigate CSI https://stevenmhernandez.github.io/ESP32-CSI-Tool/
  • Compile unix tools to ELF apps?