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Refine low battery shutdown conditions

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Update low battery shutdown logic to require corroboration from both voltage and SoC.

Signed-off-by: Niel Nielsen <nieldk@gmail.com>
This commit is contained in:
Niel Nielsen
2026-08-29 19:10:08 +02:00
committed by GitHub
parent 09bf8fb04e
commit d49a5299b0
1 changed files with 5 additions and 2 deletions
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armsrc/bwm_charger.c
+5 -2
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@@ -456,8 +456,11 @@ void bwm_lowbatt_check(void) {
// Critical: voltage-primary, SoC secondary. Require BWM_SHUTDOWN_CONFIRMATIONS
// consecutive sub-floor polls, then latch power off (same release as the
// long-press shutdown; a button press powers back on, in hardware).
if ((mv <= BWM_SHUTDOWN_MV) || (soc <= BWM_SHUTDOWN_SOC_PCT)) {
if (++crit >= BWM_SHUTDOWN_CONFIRMATIONS) {
// voltage-primary; SoC can only *corroborate* (it over-reads on an
// uncalibrated gauge - e.g. <3% reported at 3.6 V). Never let SoC alone
// trigger power-off: require the pack to also be in the low-batt zone.
if ((mv <= BWM_SHUTDOWN_MV) ||
((soc <= BWM_SHUTDOWN_SOC_PCT) && (mv <= BWM_LOWBATT_MV))) { if (++crit >= BWM_SHUTDOWN_CONFIRMATIONS) {
bwm_beep_low_batt(); // final audible warning before cut-off
LEDsoff();
Gpio_ARM_Power_ON_Low();