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Incredibly broken YM2612 support plus a fix to Z80 bus request
author Mike Pavone <pavone@retrodev.com>
date Wed, 29 May 2013 00:57:19 -0700
parents b7c3facee762
children 0f8a759f1ff4
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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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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 uint16_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 buffer_pos;
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43 uint32_t sample_limit;
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44 uint32_t current_cycle;
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45 uint32_t write_cycle;
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46 ym_operator operators[NUM_OPERATORS];
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47 ym_channel channels[NUM_CHANNELS];
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48 uint16_t timer_a;
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49 uint16_t timer_a_load;
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50 uint16_t env_counter;
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51 uint8_t current_op;
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52 uint8_t current_env_op;
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53 uint8_t timer_b;
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54 uint8_t timer_b_load;
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55 uint8_t timer_control;
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56 uint8_t dac_enable;
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57 uint8_t status;
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58 uint8_t selected_reg;
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59 uint8_t selected_part;
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60 } ym2612_context;
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61
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62 void ym_init(ym2612_context * context, uint32_t sample_rate, uint32_t clock_rate, uint32_t sample_limit);
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63 void ym_run(ym2612_context * context, uint32_t to_cycle);
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64 void ym_address_write_part1(ym2612_context * context, uint8_t address);
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65 void ym_address_write_part2(ym2612_context * context, uint8_t address);
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66 void ym_data_write(ym2612_context * context, uint8_t value);
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67 uint8_t ym_read_status(ym2612_context * context);
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69 #endif //YM2612_H_
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