12-OBD-Speed: choose the background GIF from the SD card

- background page (4th tile): built-in or any GIF in /gifs on the SD card
- chosen GIF is copied into a raw 11.9 MB 'bggif' flash partition (header
  written last) and played memory-mapped from flash; SD only needed when
  choosing or when the file changed (checked at boot in the background)
- own partitions.csv: 4 MB app + bggif + NVS
- tools/gif_to_360.py: convert GIFs to 360x360 keeping frame timing;
  converted output (12-OBD-Speed/sd/) is git-ignored

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
patriandClaude Opus 5.5 committed 2026-10-23 18:58:44 +02:00
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# JC3636W518 OBD speed: one 4 MB app (no OTA) + 11.9 MB raw area for the background GIF (written/mmapped by bg_store.cpp)
# Name, Type, SubType, Offset, Size
nvs, data, nvs, 0x9000, 0x6000,
app0, app, factory, 0x10000, 0x400000,
bggif, data, 0x40, 0x410000, 0xBE0000,
coredump, data, coredump, 0xFF0000, 0x10000,
1 # JC3636W518 OBD speed: one 4 MB app (no OTA) + 11.9 MB raw area for the background GIF (written/mmapped by bg_store.cpp)
2 # Name, Type, SubType, Offset, Size
3 nvs, data, nvs, 0x9000, 0x6000,
4 app0, app, factory, 0x10000, 0x400000,
5 bggif, data, 0x40, 0x410000, 0xBE0000,
6 coredump, data, coredump, 0xFF0000, 0x10000,