64 lines
1.4 KiB
C
64 lines
1.4 KiB
C
/*
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This file is part of Emu-Pizza
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Emu-Pizza is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Emu-Pizza is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Emu-Pizza. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __TIMER_HDR__
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#define __TIMER_HDR__
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#include <stdint.h>
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/* timer status */
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typedef struct timer_gb_s
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{
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/* is it active? */
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uint8_t active;
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/* divider - 0xFF04 */
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uint8_t div;
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/* modulo - 0xFF06 */
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uint8_t mod;
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/* control - 0xFF07 */
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uint8_t ctrl;
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/* counter - 0xFF05 */
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uint_fast32_t cnt;
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/* threshold */
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uint32_t threshold;
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/* current value */
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uint_fast32_t sub;
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uint64_t next;
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/* spare */
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uint_fast32_t sub_next;
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} timer_gb_t;
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/* global status of timer */
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timer_gb_t timer;
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/* prototypes */
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void timer_init();
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void timer_step();
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void timer_write_reg(uint16_t a, uint8_t v);
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uint8_t timer_read_reg(uint16_t a);
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#endif
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