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annotate pico_pcm.h @ 2431:61c0bfe10887

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Somewhat busted support for Pico ADPCM
author Michael Pavone <pavone@retrodev.com>
date Tue, 06 Feb 2024 21:47:11 -0800
parents
children e8eba0cd5444
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2431
61c0bfe10887 Somewhat busted support for Pico ADPCM
Michael Pavone <pavone@retrodev.com>
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1 #ifndef PICO_PCM_H_
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2 #define PICO_PCM_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 audio_source *audio;
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10 oscilloscope *scope;
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11 uint32_t clock_inc;
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12 uint32_t cycle;
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13 uint16_t ctrl;
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14
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15 uint16_t counter;
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16 uint16_t rate;
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17 uint16_t samples;
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18 int16_t output;
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19
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20 uint8_t fifo[0x40];
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21 uint8_t fifo_read;
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22 uint8_t fifo_write;
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23 uint8_t adpcm_state;
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24 uint8_t nibble_store;
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25 uint8_t scope_channel;
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26 } pico_pcm;
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27
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28 void pico_pcm_init(pico_pcm *pcm, uint32_t master_clock, uint32_t divider);
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29 void pico_pcm_free(pico_pcm *pcm);
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30 void pico_pcm_enable_scope(pico_pcm *pcm, oscilloscope *scope, uint32_t master_clock);
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31 void pico_pcm_run(pico_pcm *pcm, uint32_t cycle);
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32 void pico_pcm_ctrl_write(pico_pcm *pcm, uint16_t value);
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33 void pico_pcm_data_write(pico_pcm *pcm, uint16_t value);
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34 uint16_t pico_pcm_ctrl_read(pico_pcm *pcm);
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35 uint16_t pico_pcm_data_read(pico_pcm *pcm);
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36 uint32_t pico_pcm_next_int(pico_pcm *pcm);
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37
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38 #endif //PICO_PCM_H_