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PM5 low-batt shutdown: gate power-off on VUSB pin, not charger PG bit

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The critical-shutdown path in bwm_lowbatt_check() was reached whenever the
AW32001 System Status "power good" bit was clear. On this hardware that bit reads
"power fail" even while the board is USB-powered under HF load (hw status shows
power fail + ~400 mA discharge on PC USB), so a low pack could trip the latched
power-off - Gpio_ARM_Power_ON_Low() + while(1) - while USB keeps the MCU alive,
leaving it spinning.

Confirm the cable really is out via the dedicated VUSB sense pin (Gpio_VUSB_Read,
the same source WITH_PM5_AUTOOFF uses) before powering off; if USB is present,
clear the streak and keep running. Also print a reason before cut-off, and fix a
brace/formatting glitch on the trigger condition.
This commit is contained in:
Msprg
2026-09-02 14:16:27 +02:00
parent d1e0476278
commit 9f2fd682e5
1 changed files with 18 additions and 5 deletions
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armsrc/bwm_charger.c
+18 -5
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@@ -471,6 +471,7 @@ 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)) {
@@ -503,11 +504,23 @@ 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