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annotate ym2612.h @ 345:29d2ca563499

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Don't sync the 68K clock to the VDP clock unless the 68K had to wait for the VDP. This unfortunately breaks the direct color DMA demos, but should be more correct overall.
author Mike Pavone <pavone@retrodev.com>
date Sun, 19 May 2013 13:47:47 -0700
parents a8ee7934a1f8
children cc39629e8d06
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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.
Mike Pavone <pavone@retrodev.com>
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1 #ifndef YM2612_H_
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2 #define YM2612_H_
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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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4 #include <stdint.h>
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5
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6 #define NUM_SHARED_REGS (0x30-0x21)
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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7 #define NUM_PART_REGS (0xB7-0x30)
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8
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9 typedef struct {
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10 uint32_t current_cycle;
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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11 uint32_t write_cycle;
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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12 uint8_t *selected_reg;
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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13 uint16_t timer_a;
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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14 uint8_t timer_b;
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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15 uint8_t reg_num;
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16 uint8_t status;
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17 uint8_t part1_regs[NUM_SHARED_REGS+NUM_PART_REGS];
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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18 uint8_t part2_regs[NUM_PART_REGS];
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19 } ym2612_context;
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21 void ym_init(ym2612_context * context);
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22 void ym_run(ym2612_context * context, uint32_t to_cycle);
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23 void ym_address_write_part1(ym2612_context * context, uint8_t address);
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24 void ym_address_write_part2(ym2612_context * context, uint8_t address);
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25 void ym_data_write(ym2612_context * context, uint8_t value);
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26 uint8_t ym_read_status(ym2612_context * context);
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28 #endif //YM2612_H_
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