void myProxActivateddCallback(enum mtouch_proximity_names prox)
{
    printf("The proximity sensor %d is activated.\r\n", prox);
}

void myProxReleasedCallback(enum mtouch_proximity_names prox)
{
    printf("The proximity sensor %d is released.\r\n", prox);
}

main()
{
    ...

    MTOUCH_Proximity_SetActivatedCallback(myProxActivateddCallback);
    MTOUCH_Proximity_SetNotActivatedCallback(myProxReleasedCallback);
    ...

    while(1)
    {
       MTOUCH_Service_Mainloop();
    }
}