void PU_CheckButtons(PU_ButtonTypeDef* PU_ButtonStruct)
{
    static int menu_delay = 0;
    static int menu_old_state = 0;
    static int menu_state;

    // get current state
    menu_state = ReadPin(); // insert your ReadPin() function here, returns 0 if button pressed and 1 if not pressed

    // reset values
    PU_ButtonStruct->MenuShortPress     = 0;

    // button held, time
    if(menu_state == 0 && menu_old_state == 0)
        menu_delay++;

    // button depressed, short press detection
    if(menu_state == 1 && menu_old_state == 0) //current_menu
    {
        if(menu_delay >= MIN_PRES_TIME && menu_delay < SHORT_PRESS_TIME)
            PU_ButtonStruct->MenuShortPress = 1;
        menu_delay = 0;
    }

    // store state
    menu_old_state = menu_state;
}