PWMConfig Struct Reference

Configuration data for PWM audio output. More...

#include <PWMDriverBase.h>

Inheritance diagram for PWMConfig:

Public Member Functions
	PWMConfig ()
virtual void	clear ()
void	copyFrom (AudioInfo info)
	Same as set.
bool	equals (AudioInfo alt)
	Returns true if alt values are the same like the current values.
bool	equalsExSampleRate (AudioInfo alt)
	Checks if only the sample rate is different.
void	logConfig ()
virtual void	logInfo (const char *source="")
	operator bool ()
	Returns true if all components are defined (no component is 0)
bool	operator!= (AudioInfo alt)
	Returns true if alt values are the different from the current values.
bool	operator== (AudioInfo alt)
	Returns true if alt values are the same like the current values.
void	set (AudioInfo info)
	Copies the values from info.
void	setAudioInfo (AudioInfo info)
	Same as set.

Public Attributes
uint8_t	bits_per_sample = DEFAULT_BITS_PER_SAMPLE
	Number of bits per sample (int16_t = 16 bits)
uint16_t	buffer_size = PWM_BUFFER_SIZE
	size of an inidividual buffer
uint8_t	buffers = PWM_BUFFER_COUNT
	number of buffers
uint16_t	channels = DEFAULT_CHANNELS
	Number of channels: 2=stereo, 1=mono.
uint16_t	dead_time_us = 0
	Dead time in microseconds for symmetric PWM (ESP32 only)
uint32_t	max_sample_rate = PWM_MAX_SAMPLE_RATE
	max sample sample rate that still produces good audio
uint32_t	pwm_frequency = 0
	additinal info which might not be used by all processors
uint8_t	resolution = 8
	Only used by ESP32: must be between 8 and 11 -> drives pwm frequency // 20,000Hz (not used by ESP32)
sample_rate_t	sample_rate = DEFAULT_SAMPLE_RATE
	Sample Rate: e.g 44100.
uint8_t	timer_id = 0
	Timer used: Only used by ESP32 must be between 0 and 3

Protected Attributes
Pins	pins_data

Detailed Description

Configuration data for PWM audio output.

Author

Phil Schatzmann

Copyright

GPLv3

Constructor & Destructor Documentation

PWMConfig()

PWMConfig ( )

inline

Member Function Documentation

clear()

virtual void clear ( )

inlinevirtualinherited

copyFrom()

void copyFrom ( AudioInfo  info )

inlineinherited

Same as set.

equals()

bool equals ( AudioInfo  alt )

inlineinherited

Returns true if alt values are the same like the current values.

equalsExSampleRate()

bool equalsExSampleRate ( AudioInfo  alt )

inlineinherited

Checks if only the sample rate is different.

logConfig()

void logConfig ( )

inline

logInfo()

virtual void logInfo ( const char *  source = "" )

inlinevirtualinherited

Reimplemented in I2SConfigESP32, I2SConfigESP32V1, and I2SConfigStd.

operator bool()

operator bool ( )

inlineinherited

Returns true if all components are defined (no component is 0)

operator!=()

bool operator!= ( AudioInfo  alt )

inlineinherited

Returns true if alt values are the different from the current values.

operator==()

bool operator== ( AudioInfo  alt )

inlineinherited

Returns true if alt values are the same like the current values.

set()

void set ( AudioInfo  info )

inlineinherited

Copies the values from info.

setAudioInfo()

void setAudioInfo ( AudioInfo  info )

inlineinherited

Same as set.

Member Data Documentation

bits_per_sample

uint8_t bits_per_sample = DEFAULT_BITS_PER_SAMPLE

inherited

Number of bits per sample (int16_t = 16 bits)

buffer_size

uint16_t buffer_size = PWM_BUFFER_SIZE

size of an inidividual buffer

buffers

uint8_t buffers = PWM_BUFFER_COUNT

number of buffers

channels

uint16_t channels = DEFAULT_CHANNELS

inherited

Number of channels: 2=stereo, 1=mono.

dead_time_us

uint16_t dead_time_us = 0

Dead time in microseconds for symmetric PWM (ESP32 only)

max_sample_rate

uint32_t max_sample_rate = PWM_MAX_SAMPLE_RATE

max sample sample rate that still produces good audio

pins_data

Pins pins_data

protected

pwm_frequency

uint32_t pwm_frequency = 0

additinal info which might not be used by all processors

resolution

uint8_t resolution = 8

Only used by ESP32: must be between 8 and 11 -> drives pwm frequency // 20,000Hz (not used by ESP32)

sample_rate

sample_rate_t sample_rate = DEFAULT_SAMPLE_RATE

inherited

Sample Rate: e.g 44100.

timer_id

uint8_t timer_id = 0

Timer used: Only used by ESP32 must be between 0 and 3

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The documentation for this struct was generated from the following file:

• src/AudioTools/CoreAudio/AudioPWM/PWMDriverBase.h