evmu_buzzer.h File Reference

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Data Structures
struct	EvmuBuzzerClass
struct	EvmuBuzzer

Macros
#define	EVMU_BUZZER_NAME   "buzzer"
#define	EVMU_BUZZER_PCM_BUFFER_SIZE   256
Type System
Type UUID and cast operators
#define	EVMU_BUZZER_TYPE   (GBL_TYPEID(EvmuBuzzer))
#define	EVMU_BUZZER(self)
#define	EVMU_BUZZER_CLASS(klass)
#define	EVMU_BUZZER_GET_CLASS(self)

Functions
GblType	EvmuBuzzer_type (void)

Detailed Description

EvmuBuzzer: Piezoelectric buzzer, PWM tone generation.

The EvmuBuzzer API encompasses everything pertaining to signal generation and driving the piezoelectric buzzer. It provides a front-end API for generating and playing tones, as well as a polymorphic event-driven back-end for buffering and playing the generated tones with an audio back-end.

Todo

• Stop playback when emulation halts
• Have to emulate Timer1 mode 3 buzzer output
• Have to emulate base timer PWM output mode
• Document emulated modes
• Document how to implement a new back-end
• Represent PCM buffer as GblByteArray, resizable samples

Test

• PCMs generated from setting tones under different timer1 configs
• signals for tone generation

Bug

• Mini PacMan has no sound
• Still not quite handling T1ELDC perfectly

Author

2023 Falco Girgis

Copyright

MIT License

Definition in file evmu_buzzer.h.

Macro Definition Documentation

EVMU_BUZZER

#define EVMU_BUZZER

(

self

)

Value:

(GBL_CAST(EvmuBuzzer, self))

Cast GblInstance to EvmuBuzzer.

Definition at line 41 of file evmu_buzzer.h.

EVMU_BUZZER_CLASS

#define EVMU_BUZZER_CLASS

(

klass

)

Value:

(GBL_CLASS_CAST(EvmuBuzzer, klass))

Cast GblClass to EvmuBuzzerClass.

Definition at line 42 of file evmu_buzzer.h.

EVMU_BUZZER_GET_CLASS

#define EVMU_BUZZER_GET_CLASS

(

self

)

Value:

(GBL_CLASSOF(EvmuBuzzer, self))

Get EvmuBuzzerClass from GblInstance

Definition at line 43 of file evmu_buzzer.h.

EVMU_BUZZER_NAME

#define EVMU_BUZZER_NAME   "buzzer"

EvmuBuzzer GblObject name.

Definition at line 46 of file evmu_buzzer.h.

EVMU_BUZZER_PCM_BUFFER_SIZE

#define EVMU_BUZZER_PCM_BUFFER_SIZE   256

Size of internal PCM buffer (bytes)

Definition at line 47 of file evmu_buzzer.h.

EVMU_BUZZER_TYPE

#define EVMU_BUZZER_TYPE   (GBL_TYPEID(EvmuBuzzer))

GblType UUID for GblBuzzer.

Definition at line 40 of file evmu_buzzer.h.

Function Documentation

EvmuBuzzer_type()

GblType EvmuBuzzer_type

(

void

)

EvmuBuzzer's type ID.