GPIO configuration in extend_sleep mode

I set the P3.2 to hight. I use ke_timer_set( ) function to generate 10ms timer. In the timer interrupt function I set the P3.2 to low . The action generate once in every 100 ms .

alert_state。端口= 3
alert_state。pin = 2

void a_function( )
{
GPIO_SetActive( alert_state.port, alert_state.pin);
ke_timer_set(APP_PXP_TIMER, TASK_APP, 1);
}
a_function是调用ed every 100ms

int proxr_create_db_cfm_handler(ke_msg_id_t const msgid,
struct proxr_create_db_cfm const *param,
ke_task_id_t const dest_id,
ke_task_id_t const src_id)
{
GPIO_SetInactive( alert_state.port, alert_state.pin);
ke_timer_clear(APP_PXP_TIMER, TASK_APP);
}

if no define extend_sleep, it works normal.

When define extend_sleep, the time that P3.2 is hight is less than 10ms(about 7ms). Howerver the APP_PXP_TIMER work normal . It means the P3.2 was set to low somewhere else in
the project.

Can you give me some advice.
Thank you.