InfiniTime smartwatch firmware

What you’re building

InfiniTime is GPL-licensed C++ firmware for PineTime and related explicitly supported targets, built with FreeRTOS, LVGL, and NimBLE. On PineTime it supplies watch faces, apps, notifications through companion software, settings, health-oriented sensors, and Bluetooth services. Most users install a release DFU over Bluetooth with a compatible companion such as Gadgetbridge, InfiniLink, Amazfish, Siglo, ITD, WatchMate, or a Web BLE browser; developers can build with ARM GCC, Nordic SDK 15.3.0, CMake, and optional DFU tooling. The expected result is a usable open-source smartwatch interface replacing or updating the existing firmware. Updates must be manually validated on the watch or a later reset reverts them, while resource bundles for newer apps and faces are flashed separately from the 512 KB firmware image.

Key steps

1. Check the currently installed InfiniTime and bootloader versions from the watch’s About screen.
2. Download the desired pinetime-mcuboot-app-dfu release ZIP and, when needed, its matching resource ZIP from the project releases.
3. Pair with a supported companion application and use that app’s firmware-update workflow to send the DFU package.
4. After the watch boots the new firmware, open Settings, select Firmware, and manually validate the running image.
5. Transfer the matching resource package separately when the selected release’s apps or watch faces use external flash assets.