/* Before reading touch pad, we need to initialize the RTC IO.  */
static void tp_example_touch_pad_init()
/* Before reading touch pad, we need to initialize the RTC IO.  */
static void tp_example_touch_pad_init()
{
    for (int i = 0;i< TOUCH_PAD_MAX;i++) {
        touch_pad_config(i, TOUCH_THRESH_NO_USE);
    }
}