1/* Copyright (c) 2013-2016 Jeffrey Pfau
 2 *
 3 * This Source Code Form is subject to the terms of the Mozilla Public
 4 * License, v. 2.0. If a copy of the MPL was not distributed with this
 5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 6#ifndef GB_TIMER_H
 7#define GB_TIMER_H
 8
 9#include "util/common.h"
10
11CXX_GUARD_START
12
13#include "core/timing.h"
14
15DECL_BITFIELD(GBRegisterTAC, uint8_t);
16DECL_BITS(GBRegisterTAC, Clock, 0, 2);
17DECL_BIT(GBRegisterTAC, Run, 2);
18
19enum {
20	GB_DMG_DIV_PERIOD = 16
21};
22
23struct GB;
24struct GBTimer {
25	struct GB* p;
26
27	struct mTimingEvent event;
28	struct mTimingEvent irq;
29
30	uint32_t internalDiv;
31	int32_t nextDiv;
32	uint32_t timaPeriod;
33};
34
35void GBTimerReset(struct GBTimer*);
36void GBTimerDivReset(struct GBTimer*);
37uint8_t GBTimerUpdateTAC(struct GBTimer*, GBRegisterTAC tac);
38
39struct GBSerializedState;
40void GBTimerSerialize(const struct GBTimer* timer, struct GBSerializedState* state);
41void GBTimerDeserialize(struct GBTimer* timer, const struct GBSerializedState* state);
42
43CXX_GUARD_END
44
45#endif