gpio_acknowledge_irq() function

This may be called with a mask of any of valid bits specified in gpio_irq_level , however it has no effect on \a level sensitive interrupts which remain pending while the GPIO is at the specified level. When handling \a level sensitive interrupts, you should generally disable the interrupt (see gpio_set_irq_enabled) and then set it up again later once the GPIO level has changed (or to catch the opposite level). For callbacks set with gpio_set_irq_enabled_with_callback, or gpio_set_irq_callback, this function is called automatically.