Work in progress. No guarantee that this firmware will ever be usable.

Features/goals:

• Long standby time, possibly up to a few months.
• Fast and responsive display.
• Easy to work on, if you know the Go programming language.
• Full-featured testing in simulation: use go run . to test the firmware directly on your computer instead of having to flash it to the PineTime.

Warning: installing this firmware comes at your own risk. While it looks reliable to me, there is always the risk that it bricks a sealed PineTime.

To use this bootloader:

1. Install the Wasp-OS bootloader.
   I have found the OTA tool from InfiniTime to be more reliable in this step (it appears that the Wasp-OS ota.py doesn't work with InfiniTime).

   ./dfu.py -a <macaddress> --legacy -z path/to/reloader-mcuboot.zip
   

   Wait until you see a small blue pine icon that slowly turns white, and then the Wasp-OS bootloader screen.

2. Create a firmware package. You can use the following command:

   tinygo build -o watch.zip -target=./pinetime-wasp-bootloader.json -opt=2
   

3. Flash the firmware package using ota.py (from either InfiniTime or Wasp-OS).

   ./dfu.py -a <macaddress> --legacy -z watch.zip
   

4. Enjoy the new firmware!

Once you have done the first OTA using the Wasp-OS bootloader and you have access to the SWD pins, you can flash the firmware using SWD:

tinygo flash -target=./pinetime-wasp-bootloader.json

If you want to go back, you can follow the steps on the wiki (Wasp-os => InfiniTime).

Check out the repository and run the following command to start the simulator:

go run .

You may need to install a few dependencies first:

• Go (at least version 1.20)
• Fyne dependencies

This is what it might look like:

You can also flash the firmware directly to the PineTime, using the following command (use the -programmer= flag if you don't use a J-Link programmer):

tinygo flash -target=./pinetime-wasp-bootloader.json -opt=2