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Implement automatic power-off on USB unplug

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Added automatic power-off feature on USB unplug with configurable grace period and polling interval.

Signed-off-by: Niel Nielsen <nieldk@gmail.com>
This commit is contained in:
Niel Nielsen
2026-08-25 12:43:53 +02:00
committed by Philippe Teuwen
parent ee0c841556
commit ed06150edc
1 changed files with 75 additions and 1 deletions
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armsrc/appmain.c
+75 -1
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@@ -242,7 +242,7 @@ static void print_pm5_battery_status(void) {
(cur > 5) ? _GREEN_("(charging)") :
(cur < -5) ? _YELLOW_("(discharging)") : "(idle)");
Dbprintf(" Remaining capacity.. %u mAh", rem);
Dbprintf(" Temp (gauge)........ %d.%d C", tempC10 / 10, tabs % 10);
Dbprintf(" Battery temp........ %d.%d C", tempC10 / 10, tabs % 10);
} else {
Dbprintf(" Fuel gauge.......... " _YELLOW_("not responding") " (BQ27427 absent or I2C down)");
}
@@ -448,6 +448,66 @@ static void bwm_power_led_check(void) {
}
#endif // WITH_PM5_PWR_LED
#ifdef WITH_PM5_AUTOOFF
// Automatic power-off on USB unplug. When the BWM keeps the PM5 alive on battery,
// users leave it draining. This powers the board down after USB has been absent
// continuously for a grace period, using the SAME latch release as the long-press
// shutdown (Gpio_ARM_Power_ON_Low). Button power-ON is a hardware function and is
// unaffected - once powered off there is no firmware running to interfere with it.
//
// Runtime toggle (default ON) via CMD_PM5_BWM_AUTOOFF; resets to default each boot.
// Standalone / BLE-relay users who run unplugged on purpose can disable it.
#ifndef PM5_AUTOOFF_GRACE_MS
#define PM5_AUTOOFF_GRACE_MS 10000 // USB must be absent this long before power-off
#endif
#ifndef PM5_AUTOOFF_POLL_MS
#define PM5_AUTOOFF_POLL_MS 500 // how often to sample VUSB
#endif
bool g_autooff_enabled = true; // default on; toggled by CMD_PM5_BWM_AUTOOFF
static bool s_autooff_setup = false;
static void bwm_autooff_check(void) {
static uint32_t last_tick = 0;
static uint32_t usb_gone_since = 0; // tick when USB first read absent; 0 = present
if (g_autooff_enabled == false) {
usb_gone_since = 0;
return;
}
if ((last_tick != 0) && (GetTickCountDelta(last_tick) < PM5_AUTOOFF_POLL_MS)) {
return;
}
last_tick = GetTickCount();
if (s_autooff_setup == false) {
gpio_vusb_setup();
s_autooff_setup = true;
}
// Gpio_VUSB_Read() == true means USB power present.
if (Gpio_VUSB_Read()) {
usb_gone_since = 0; // present (or came back) -> reset the grace timer
return;
}
// USB absent. Start / continue the debounce window.
if (usb_gone_since == 0) {
usb_gone_since = GetTickCount();
return;
}
if (GetTickCountDelta(usb_gone_since) < PM5_AUTOOFF_GRACE_MS) {
return; // not gone long enough yet; a replug resets it above
}
// USB confirmed absent for the full grace period: power off via the latch.
LEDsoff();
Gpio_ARM_Power_ON_Low();
while (1); // wait for hardware power-off (button press powers back on, in hardware)
}
#endif // WITH_PM5_AUTOOFF
#ifdef WITH_LCD
#include "LCD_disabled.h"
#endif
@@ -4075,6 +4135,17 @@ static void PacketReceived(PacketCommandNG *packet) {
reply_ng(CMD_PM5_BWM_CHARGE_EN, ok ? PM3_SUCCESS : PM3_EFAILED, NULL, 0);
break;
}
case CMD_PM5_BWM_AUTOOFF: {
// Toggle automatic power-off on USB unplug (runtime, default on).
// Payload: 1 byte, non-zero = enable (default), zero = disable.
#ifdef WITH_PM5_AUTOOFF
g_autooff_enabled = (packet->length >= 1) ? (packet->data.asBytes[0] != 0) : true;
reply_ng(CMD_PM5_BWM_AUTOOFF, PM3_SUCCESS, (uint8_t *)&g_autooff_enabled, 1);
#else
reply_ng(CMD_PM5_BWM_AUTOOFF, PM3_ENOTIMPL, NULL, 0);
#endif
break;
}
#endif
#endif
default: {
@@ -4166,6 +4237,9 @@ void __attribute__((noreturn)) AppMain(void) {
#ifdef WITH_PM5_PWR_LED
bwm_power_led_check();
#endif
#ifdef WITH_PM5_AUTOOFF
bwm_autooff_check();
#endif
if (*_stack_start != 0xdeadbeef) {
Dbprintf("DEBUG: increase stack size, currently " _YELLOW_("%d") " bytes", (uint32_t)_stack_end - (uint32_t)_stack_start);