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67 lines
1.5 KiB
67 lines
1.5 KiB
/** @file mmelody.h
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@author M. P. Hayes, UCECE
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@date 20 April 2007
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@brief Play simple melodies.
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*/
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#ifndef MMELODY_H
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#define MMELODY_H
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#include "system.h"
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#include "ticker.h"
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typedef uint8_t mmelody_speed_t;
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typedef uint8_t mmelody_scale_t;
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typedef uint8_t mmelody_note_t;
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typedef uint8_t mmelody_volume_t;
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enum {MMELODY_OCTAVE_DEFAULT = 4};
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enum {MMELODY_SPEED_DEFAULT = 200};
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typedef struct
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{
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ticker_t ticker;
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/* Pointer to current position in string. */
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const char *cur;
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/* Pointer to start of string. */
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const char *start;
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const char *loop_start;
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int8_t loop_count;
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uint8_t note_fraction;
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mmelody_speed_t speed;
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mmelody_volume_t volume;
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uint8_t octave;
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void (* play_callback) (void *data, uint8_t note, uint8_t volume);
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void *play_callback_data;
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uint16_t poll_rate;
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} mmelody_private_t;
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typedef mmelody_private_t mmelody_obj_t;
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typedef mmelody_obj_t *mmelody_t;
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typedef void (* mmelody_callback_t) (void *data, uint8_t note, uint8_t volume);
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extern mmelody_t
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mmelody_init (mmelody_obj_t *dev,
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uint16_t poll_rate,
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mmelody_callback_t play_callback,
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void *play_callback_data);
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extern void
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mmelody_play (mmelody_t mmelody, const char *str);
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extern void
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mmelody_update (mmelody_t mmelody);
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/* Set (base) speed in beats per minute (BPM). */
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extern void
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mmelody_speed_set (mmelody_t mmelody, mmelody_speed_t speed);
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/* Set volume as percentage of maximum. */
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extern void
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mmelody_volume_set (mmelody_t mmelody, mmelody_volume_t volume);
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#endif
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