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annotate ym2612.h @ 380:1c8d74f2ab0b

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Make the PSG and YM2612 use the master clock internal with an increment based on clock divider so that they stay perflectly in sync. Run both the PSG and YM2612 whenver one of them needs to be run.
author Mike Pavone <pavone@retrodev.com>
date Mon, 03 Jun 2013 21:43:38 -0700
parents 0f8a759f1ff4
children 72933100c55c
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1 #ifndef YM2612_H_
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2 #define YM2612_H_
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3
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4 #include <stdint.h>
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5
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6 #define NUM_PART_REGS (0xB7-0x30)
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7 #define NUM_CHANNELS 6
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8 #define NUM_OPERATORS (4*NUM_CHANNELS)
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9
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10 typedef struct {
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11 uint32_t phase_inc;
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12 uint32_t phase_counter;
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13 uint16_t envelope;
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14 int16_t output;
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15 uint16_t total_level;
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16 uint16_t sustain_level;
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17 uint8_t rates[4];
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18 uint8_t key_scaling;
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19 uint8_t multiple;
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20 uint8_t detune;
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21 uint8_t env_phase;
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22 } ym_operator;
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23
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24 typedef struct {
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25 uint16_t fnum;
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26 int16_t output;
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27 uint8_t block_fnum_latch;
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28 uint8_t block;
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29 uint8_t keycode;
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30 uint8_t algorithm;
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31 uint8_t feedback;
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32 uint8_t ams;
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33 uint8_t pms;
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34 uint8_t lr;
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35 } ym_channel;
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36
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37 typedef struct {
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38 int16_t *audio_buffer;
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39 int16_t *back_buffer;
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40 double buffer_fraction;
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41 double buffer_inc;
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42 uint32_t clock_inc;
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43 uint32_t buffer_pos;
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44 uint32_t sample_limit;
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45 uint32_t current_cycle;
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46 uint32_t write_cycle;
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47 ym_operator operators[NUM_OPERATORS];
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48 ym_channel channels[NUM_CHANNELS];
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49 uint16_t timer_a;
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50 uint16_t timer_a_load;
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51 uint16_t env_counter;
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52 uint8_t current_op;
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53 uint8_t current_env_op;
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54 uint8_t timer_b;
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55 uint8_t timer_b_load;
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56 uint8_t timer_control;
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57 uint8_t dac_enable;
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58 uint8_t status;
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59 uint8_t selected_reg;
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60 uint8_t selected_part;
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61 } ym2612_context;
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62
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63 void ym_init(ym2612_context * context, uint32_t sample_rate, uint32_t master_clock, uint32_t clock_div, uint32_t sample_limit);
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64 void ym_run(ym2612_context * context, uint32_t to_cycle);
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65 void ym_address_write_part1(ym2612_context * context, uint8_t address);
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66 void ym_address_write_part2(ym2612_context * context, uint8_t address);
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67 void ym_data_write(ym2612_context * context, uint8_t value);
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68 uint8_t ym_read_status(ym2612_context * context);
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70 #endif //YM2612_H_
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