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
11DECL_BITFIELD(GBRegisterTAC, uint8_t);
12DECL_BITS(GBRegisterTAC, Clock, 0, 2);
13DECL_BIT(GBRegisterTAC, Run, 2);
14
15enum {
16	GB_DMG_DIV_PERIOD = 256
17};
18
19struct GB;
20struct GBTimer {
21	struct GB* p;
22
23	int32_t nextEvent;
24	int32_t eventDiff;
25
26	int32_t nextDiv;
27	int32_t nextTima;
28	int32_t timaPeriod;
29};
30
31void GBTimerReset(struct GBTimer*);
32int32_t GBTimerProcessEvents(struct GBTimer*, int32_t cycles);
33void GBTimerDivReset(struct GBTimer*);
34uint8_t GBTimerUpdateTAC(struct GBTimer*, GBRegisterTAC tac);
35void GBTimerUpdateTIMA(struct GBTimer* timer);
36
37struct GBSerializedState;
38void GBTimerSerialize(const struct GBTimer* timer, struct GBSerializedState* state);
39void GBTimerDeserialize(struct GBTimer* timer, const struct GBSerializedState* state);
40
41#endif