shutdown offset led pattern

Author: sctanf

src/system/system.c

@@ -424,9 +424,15 @@ int sys_user_shutdown(void)
 {
 	int64_t start_time = k_uptime_get();
 	bool use_shutdown = CONFIG_0_SETTINGS_READ(CONFIG_0_USER_SHUTDOWN);
-	set_led(SYS_LED_PATTERN_LONG, SYS_LED_PRIORITY_HIGHEST);
+	set_led(SYS_LED_PATTERN_OFF_FORCE, SYS_LED_PRIORITY_HIGHEST);
+	bool led_on = false;
 	while (button_read()) // If alternate button is available and still pressed, wait for the user to stop pressing the button
 	{
+		if (!led_on && k_uptime_get() - start_time > 500) // long pattern starts with led on, so delay pattern a bit
+		{
+			set_led(SYS_LED_PATTERN_LONG, SYS_LED_PRIORITY_HIGHEST);
+			led_on = 1;
+		}
 		if (k_uptime_get() - start_time > 4000) // held for over 5 seconds, cancel shutdown
 		{
 			set_led(SYS_LED_PATTERN_OFF, SYS_LED_PRIORITY_HIGHEST);