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Initial work on emulating the YMZ263B in the Copera
author Michael Pavone <pavone@retrodev.com>
date Fri, 23 Feb 2024 01:16:38 -0800
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children b5640ac9aea9
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2460
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
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1 #ifndef YMZ263B_H_
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2 #define YMZ263B_H_
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3
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4 #include <stdint.h>
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5 #include "render_audio.h"
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6 #include "oscilloscope.h"
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7
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8 typedef struct {
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9 uint8_t fifo[128];
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10 uint8_t fifo_read;
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11 uint8_t fifo_write;
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12
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13 uint8_t regs[4];
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14 } ymz263b_pcm;
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15
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16 typedef struct {
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17 uint8_t fifo[16];
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18 uint8_t read;
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19 uint8_t write;
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20 } ymz_midi_fifo;
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21
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22 typedef struct {
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23 audio_source *audio;
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24 oscilloscope *scope;
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25 ymz263b_pcm pcm[2];
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26 ymz_midi_fifo midi_rcv;
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27 ymz_midi_fifo midi_trs;
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28
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29 uint32_t clock_inc;
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30 uint32_t cycle;
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31
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32 uint16_t timers[4];
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33
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34 uint16_t status;
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35
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36 uint8_t base_regs[9];
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37 uint8_t midi_regs[2];
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38 uint8_t address;
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39 uint8_t midi_transmit;
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40 } ymz263b;
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41
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42 void ymz263b_init(ymz263b *ymz, uint32_t clock_divider);
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43 void ymz263b_run(ymz263b *ymz, uint32_t target_cycle);
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44 uint32_t ymz263b_next_int(ymz263b *ymz);
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45 void ymz263b_address_write(ymz263b *ymz, uint8_t value);
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46 void ymz263b_data_write(ymz263b *ymz, uint32_t channel, uint8_t value);
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47 uint8_t ymz263b_data_read(ymz263b *ymz, uint32_t channel);
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48 uint8_t ymz263b_status_read(ymz263b *ymz);
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49
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50 #endif //YMZ263B_H_