April 21st, 2021

This is a bugfix & maintenance release for Castor & Pollux's firmware, Gemini ♊️.

👉 Most users should download gemini-firmware-2021.04.21-release.uf2 👈

Please follow the firmware upgrade instructions in the user's guide to upgrade your device's firmware.

About the files

• The uf2 files can be installed using the firmware upgrade instructions in the user's guide.
• The elf files and are for testing & debugging and can be programmed using an appropriate debug probe.
• The release builds are built without debugging information.
• The debug builds are built with debugging information.

Build identifier

Each release of the firmware has a unique build ID. This ID can be seen when using the online settings editor and allows finding the exact firmware version on your device. The build IDs for this version are:

• Release: 2021.04.21 (release) on 04/21/2021 18:59 UTC with gcc 10.2.1 by [email protected]
• Debug: 2021.04.21 (debug) on 04/21/2021 18:59 UTC with gcc 10.2.1 by [email protected]

Changes from 2021.04.20

Firmware:

• Use the brown-out detector to ensure a stable operating voltage before running
• Remove unneeded change to NVM configuration from gem_nvm_init, as its done in reset_handler
• Update 48 MHz DFLL fine step to match datasheet recommendations

Hardware:

• Added values & datasheet for pots in schematic (#13)