timer.h

/* This file is part of ukbdc.
 *
 * ukbdc is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * ukbdc is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with ukbdc; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

#pragma once

#include <stdint.h>
#include <stdbool.h>

#define MAX_TIMERS 8

#define ERR_TOO_MANY_TIMERS -1
#define ERR_NO_TIMER -2

/* parameters */
#define CONTINUOUS	(1 << 0)
#define DELETED		(1 << 1)

typedef struct {
	uint32_t on_tick;
	uint16_t period;
	uint8_t params;
	uint8_t id;
} timer_t;

void TIMER_init();
/* Adds a timer which will launch in time ticks. Continuous will make it
 * launch indefinitely every time ticks */
int8_t TIMER_add(uint32_t time, bool continuous);
/* Deletes one timer. Returns 0 on success or ERR_NO_TIMER */
int8_t TIMER_delete(int8_t id);