The NRF52 undervoltage bootlock feature implemented behind
NRF52_POWER_MANAGEMENT was introduced in v1.12.
It configures a fixed voltage level of 3.3V and prevents the software
from booting if the battery voltage is below that level.
This is problematic for various reasons. The most important one being
that it breaks devices that use cell chemistries other than Li-Ion,
such as LFP, LTO or SIB which have much lower minimum voltages.
As a quick fix to prevent devices from failing, disable the feature
until it has been decided how to handle this in the future and a
proper implementation has been provided.
Signed-off-by: Frieder Schrempf <frieder@fris.de>
Enable GPS time synchronization across all variants by passing
&rtc_clock to MicroNMEALocationProvider. When GPS gets a valid
fix, the RTC clock is now updated automatically every 30 minutes.
Updated 16 variants: rak4631, lilygo_tbeam_SX1262, rak_wismesh_tag,
lilygo_tbeam_supreme_SX1262, thinknode_m3, heltec_v4, thinknode_m1,
lilygo_tbeam_SX1276, meshadventurer, nano_g2_ultra, heltec_v3,
promicro, xiao_c3, heltec_tracker_v2, keepteen_lt1, heltec_mesh_solar.
The RAK13302 1W module uses a Skyworks SKY66122-11 front-end module with
three digital control pins (CSD, CTX, CPS) that must be actively driven
by the host MCU. The previous code only managed CTX (GPIO 31) — toggling
it for TX/RX — but never initialized CSD (GPIO 24) or CPS (GPIO 21),
leaving them floating with no pull-up/pull-down resistors on the PCB.
With floating CSD and CPS, the SKY66122 was in an undefined operating
mode:
- The 30 dB TX PA may not have been reliably engaging
- The 16 dB RX LNA was never reliably active, degrading receive
sensitivity
Frieder Schrempf