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Merge pull request #3582 from Msprg/pm5-fix-lowbatt-shutdown-vusb

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PM5 low-batt shutdown: gate power-off on VUSB pin, not charger PG bit
This commit is contained in:
Iceman
2026-09-02 20:05:31 +07:00
committed by GitHub
parent 9573cb355c 9f2fd682e5
commit 1d97fda4b4
1 changed files with 18 additions and 5 deletions
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armsrc/bwm_charger.c
+18 -5
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@@ -474,6 +474,7 @@ void bwm_lowbatt_check(void) {
static uint32_t last_tick = 0;
#ifdef WITH_PM5_LOWBATT_SHUTDOWN
static uint8_t crit = 0;
static bool s_vusb_setup = false;
#endif
if ((last_tick != 0) && (GetTickCountDelta(last_tick) < BWM_LOWBATT_PERIOD_MS)) {
@@ -509,11 +510,23 @@ void bwm_lowbatt_check(void) {
// 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();
while (1); // wait for hardware power-off
((soc <= BWM_SHUTDOWN_SOC_PCT) && (mv <= BWM_LOWBATT_MV))) {
if (++crit >= BWM_SHUTDOWN_CONFIRMATIONS) {
// Confirm on the VUSB pin, not the charger PG bit: PG can read
// "power fail" on USB under load, so only power off if USB is really out.
if (s_vusb_setup == false) {
gpio_vusb_setup();
s_vusb_setup = true;
}
if (Gpio_VUSB_Read()) {
crit = 0; // USB present, not a real drain
} else {
Dbprintf(_RED_("[BWM] critical battery %u mV / %u%% - powering off"), mv, soc);
bwm_beep_low_batt(); // last warning before cut-off
LEDsoff();
Gpio_ARM_Power_ON_Low();
while (1); // wait for power-off
}
}
} else {
crit = 0; // recovered above the floor -> reset the streak