qmk_firmware/quantum/audio.h

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#include <stdint.h>
#include <stdbool.h>
#include <avr/io.h>
#include <util/delay.h>
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#include "musical_notes.h"
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typedef union {
uint8_t raw;
struct {
bool enable :1;
uint8_t level :7;
};
} audio_config_t;
void audio_toggle(void);
void audio_on(void);
void audio_off(void);
void play_sample(uint8_t * s, uint16_t l, bool r);
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void play_note(double freq, int vol);
void stop_note(double freq);
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void stop_all_notes();
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void init_notes();
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void play_notes(float (*np)[][2], uint8_t n_length, bool n_repeat, float n_rest);