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 DS_TIMER_H
 7#define DS_TIMER_H
 8
 9#include <mgba-util/common.h>
10
11CXX_GUARD_START
12
13DECL_BITFIELD(DSTimerFlags, uint32_t);
14DECL_BITS(DSTimerFlags, PrescaleBits, 0, 4);
15DECL_BIT(DSTimerFlags, CountUp, 4);
16DECL_BIT(DSTimerFlags, DoIrq, 5);
17DECL_BIT(DSTimerFlags, Enable, 6);
18
19struct DSTimer {
20	uint16_t reload;
21	uint16_t oldReload;
22	int32_t lastEvent;
23	int32_t nextEvent;
24	int32_t overflowInterval;
25	DSTimerFlags flags;
26};
27
28// TODO: Merge back into GBATimer
29struct ARMCore;
30void DSTimerUpdateRegister(struct DSTimer* timer, struct ARMCore* cpu, uint16_t* io);
31void DSTimerWriteTMCNT_LO(struct DSTimer* timer, uint16_t reload);
32void DSTimerWriteTMCNT_HI(struct DSTimer* timer, struct ARMCore* cpu, uint16_t* io, uint16_t control);
33
34struct DS;
35int32_t DSTimersProcessEvents(struct DS* ds, int32_t cycles);
36
37CXX_GUARD_END
38
39#endif