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Optimize USB auto-off polling and remove grace period

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Reduced the polling interval for USB power checks and removed the grace period for auto-off functionality.

Signed-off-by: Niel Nielsen <nieldk@gmail.com>
This commit is contained in:
Niel Nielsen authored and Philippe Teuwen committed 2026-08-25 12:43:53 +02:00
1 parent 8d6cccd4ca
commit 025c714ae5
1 file changed
+6 -18
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armsrc/appmain.c
+6 -18
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@@ -457,11 +457,8 @@ static void bwm_power_led_check(void) {
//
// 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
#define PM5_AUTOOFF_POLL_MS 250 // how often to sample VUSB
#endif
bool g_autooff_enabled = true; // default on; toggled by CMD_PM5_BWM_AUTOOFF
@@ -470,10 +467,8 @@ 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)) {
@@ -486,22 +481,15 @@ static void bwm_autooff_check(void) {
s_autooff_setup = true;
}
// Gpio_VUSB_Read() == true means USB power present.
// Gpio_VUSB_Read() == true means USB power present. Once it reads absent, power
// off immediately: an idle board on battery serves no purpose, and hardware
// USB-insert wake brings it back on replug. No grace period - it would only keep
// the board pointlessly powered. Standalone/battery use is opted into via
// hw bwmautooff --off.
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)