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pelgraine
cf4105ee7d
Same silicon and the same pin map as the T-Watch S3 Plus, verified against the
T_WATCH-S3 schematic (rev 25-03-24) and LilyGo's utilities.h. The differences
are what is populated:
- no onboard GNSS. HAS_GPS/ENV_INCLUDE_GPS are left undefined, which drops the
map screen, the GPS home page and BLDO1 rail control via the gates added in
the MECK_TWATCH rename.
- no GPIO button. Schematic sheet 1 wires the side switch SW7 to net PWR_KEY
-> AXP2101 pin 30 (PWRON), so PIN_USER_BTN is undefined and MECK_PMU_BUTTON
selects PMUButton, which reads PKEY interrupts over I2C. Short press is
enter/select; a 6s hold is a hardware power-off the firmware never sees.
- DLDO1 is the MAX98357A speaker rail (schematic sheet 6, net SPK_VDD), not
'unused' as LilyGo's doc claims. It stays off, so the amp is unpowered.
- VBACKUP is enabled at 3300 mV. It charges the MS412FE coin cell (J12) that
backs the PCF8563's single-VDD supply. Leaving it off drained the cell with
nothing to replenish it.
New envs: meck_twatch_s3_standalone, meck_twatch_s3_ble.
No existing board is affected: MECK_PMU_BUTTON is defined only here.