/* Unregisters a callback. 
Unregisters and disable a callback function implemented by the user.  */
void dualtimer_unregister_callback(enum dualtimer_timer timer)
/* Unregisters a callback. 
Unregisters and disable a callback function implemented by the user.  */
void dualtimer_unregister_callback(enum dualtimer_timer timer)
{
	if (timer == DUALTIMER_TIMER1) {
		dualtimer_callback_timer1 = NULL;
	} else {
		dualtimer_callback_timer2 = NULL;
	}
}