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YM2612 WIP snapshot before register refactor
author Mike Pavone <pavone@retrodev.com>
date Mon, 27 May 2013 09:54:58 -0700
parents a8ee7934a1f8
children b7c3facee762
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a8ee7934a1f8 Add a YM2612 stub implementation with just timers and status registers so that games that depend on it can run.
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1 #ifndef YM2612_H_
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2 #define YM2612_H_
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4 #include <stdint.h>
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6 #define NUM_SHARED_REGS (0x30-0x21)
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7 #define NUM_PART_REGS (0xB7-0x30)
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8 #define NUM_OPERATORS (4*6)
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10 typedef struct {
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11 uint32_t current_cycle;
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12 uint32_t write_cycle;
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13 uint8_t *selected_reg;
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14 uint32_t phase_inc[NUM_OPERATORS];
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15 uint32_t phase_counter[NUM_OPERATORS];
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16 uint16_t envelope[NUM_OPERATORS];
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17 uint16_t op_out[NUM_OPERATORS];
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18 uint16_t channel_out[6];
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19 uint16_t timer_a;
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20 uint8_t env_phase[NUM_OPERATORS];
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21 uint8_t keycode[NUM_OPERATORS];
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22 uint8_t timer_b;
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23 uint8_t reg_num;
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24 uint8_t status;
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25 uint8_t part1_regs[NUM_SHARED_REGS+NUM_PART_REGS];
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26 uint8_t part2_regs[NUM_PART_REGS];
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27 } ym2612_context;
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29 void ym_init(ym2612_context * context);
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30 void ym_run(ym2612_context * context, uint32_t to_cycle);
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31 void ym_address_write_part1(ym2612_context * context, uint8_t address);
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32 void ym_address_write_part2(ym2612_context * context, uint8_t address);
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33 void ym_data_write(ym2612_context * context, uint8_t value);
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34 uint8_t ym_read_status(ym2612_context * context);
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36 #endif //YM2612_H_
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