The pin level status in the DA1468x/DA1510x PRO-Development kit can not be maintained after sleep

Hi,

Brief Description:
Based on the official offer routine for modified testing,
After the P1_7 pin triggers a falling edge, the D2 on the Demo board will be on,
Found that when cpu completely into sleep, Demo board D2 will go out.
Theoretically pin will remain the state before dormant, but now the actual situation is wrong.
The above effect is due to the configuration of the problems caused by what, please advise.

Details:
Using the routine for Chapter Eight Your First DA1468x Application - Blinky in UM-B-047-DA1468x Getting Started_4_1,
And follow the steps to add a flashing LED D2 program successfully.
Need to test the pin in the extended_sleep can continue to maintain the state of the pin, now make the following changes:

1, Set the sleep mode, as follows:
pm_set_wakeup_mode (true);
pm_set_sleep_mode (pm_mode_extended_sleep);

2, Detect external interrupt, used here to detect the falling edge of P1_7 will wake up the device, as follows:
#define cfg_wkup_debounce_time（32）
#define CFG_WKUP_COUNTER_THR (1)
#define CFG_WKUP_ISR_PRIORITY (1)
static void prvTemplateTask (void * pvParameters)
{
OS_TICK_TIME xNextWakeTime;
static uint32_t test_counter = 0;
uint32_t task_notify_val;

hw_gpio_configure_pin_power (HW_GPIO_PORT_1, HW_GPIO_PIN_7, HW_GPIO_POWER_V33);
hw_gpio_set_pin_function (HW_GPIO_PORT_1, HW_GPIO_PIN_7, HW_GPIO_MODE_INPUT_PULLUP, HW_GPIO_FUNC_GPIO);

hw_wkup_init（null）;
hw_wkup_set_debounce_time (CFG_WKUP_DEBOUNCE_TIME);
hw_wkup_set_counter_threshold (CFG_WKUP_COUNTER_THR);
hw_wkup_register_interrupt (hw_extint_wkup_cb, CFG_WKUP_ISR_PRIORITY);
hw_wkup_set_pin_state (HW_GPIO_PORT_1, HW_GPIO_PIN_7, true);
hw_wkup_set_pin_trigger (HW_GPIO_PORT_1, HW_GPIO_PIN_7, HW_WKUP_PIN_STATE_LOW);
for (;;)
{
OS_TASK_NOTIFY_WAIT (task_h, OS_TASK_NOTIFY_ALL_BITS, & task_notify_val, OS_TASK_NOTIFY_FOREVER);
if (task_notify_val & (1 << 0))
{
test_counter ++;
if (test_counter% 2) {
hw_gpio_set_active (HW_GPIO_PORT_1, HW_GPIO_PIN_5);
}
else {
hw_gpio_set_inactive（hw_gpio_port_1，hw_gpio_pin_5）;
}
}
}

}
static void hw_extint_wkup_cb (void)
{
hw_wkup_reset_interrupt ();
OS_TASK_NOTIFY_FROM_ISR (task_h, (1 << 0), OS_NOTIFY_SET_BITS);
}

Appendix:
According to P147 in Datasheet Revision 2.1 15-July-2016,
32.4 STATE RETENTION WHILE SLEEPING content of the section,
Into the debug mode, you find that indeed call the apply_wfi function in sys_power_mgr.c the following section:
if (dg_configBLACK_ORCA_IC_REV == BLACK_ORCA_IC_REV_A) {
hw_cpm_activate_pad_latches ();
hw_cpm_power_down_periph_pd ();
hw_cpm_wait_per_power_down ();
}