PWMDriverAVR Class Reference

Experimental: Audio output to PWM pins for the AVR. The AVR supports only up to 2 channels. More...

#include <PWMDriverAVR.h>

Inheritance diagram for PWMDriverAVR:

Public Member Functions
PWMConfig &	audioInfo ()
virtual int	availableForWrite ()
bool	begin (PWMConfig cfg)
virtual PWMConfig	defaultConfig ()
virtual int	effectiveOutputSampleRate ()
	Provides the effective sample rate.
virtual void	end ()
uint32_t	framesPerSecond ()
bool	isTimerStarted ()
void	logConfig ()
virtual int	maxChannels ()
virtual void	pwmWrite (int channel, int value)
void	setBuffer (BaseBuffer< uint8_t > *buffer)
void	setupPin (int pin)
void	setupPWM ()
	Setup LED PWM.
void	setupTimer ()
void	startTimer ()
uint32_t	underflowsPerSecond ()
void	updateStatistics ()
virtual size_t	write (const uint8_t *data, size_t len)

Protected Member Functions
virtual int	decimation ()
	Decimation factor to reduce the sample rate.
void	deleteBuffer ()
virtual bool	isDecimateActive ()
virtual int	maxOutputValue ()
virtual int	maxSampleRate ()
	Provides the max working sample rate.
virtual int	nextValue ()
	determines the next scaled value
void	playNextFrame ()
	writes the next frame to the output pins

Protected Attributes
AudioInfo	actual_info
PWMConfig	audio_config
BaseBuffer< uint8_t > *	buffer = nullptr
Decimate	decimate
int	decimation_factor = 0
uint32_t	frame_count = 0
uint32_t	frame_size = 0
uint32_t	frames_per_second = 0
bool	is_blocking_write = true
bool	is_timer_started = false
int	pins [2] = {3, 11}
uint32_t	time_1_sec
uint32_t	underflow_count = 0
uint32_t	underflow_per_second = 0

Friends
void	defaultPWMAudioOutputCallback ()

Detailed Description

Experimental: Audio output to PWM pins for the AVR. The AVR supports only up to 2 channels.

Author

Phil Schatzmann

Copyright

GPLv3

Member Function Documentation

decimation()

virtual int decimation ( )

inlineprotectedvirtualinherited

Decimation factor to reduce the sample rate.

Reimplemented in PWMDriverRenesas.

end()

virtual void end ( )

inlinevirtual

Reimplemented from DriverPWMBase.

isDecimateActive()

virtual bool isDecimateActive ( )

inlineprotectedvirtualinherited

The requested sampling rate is too hight: we only process half of the samples so we can half the sampling rate

maxChannels()

virtual int maxChannels ( )

inlinevirtual

Implements DriverPWMBase.

maxOutputValue()

virtual int maxOutputValue ( )

inlineprotectedvirtual

Implements DriverPWMBase.

maxSampleRate()

virtual int maxSampleRate ( )

inlineprotectedvirtualinherited

Provides the max working sample rate.

Reimplemented in PWMDriverRenesas.

pwmWrite()

virtual void pwmWrite ( int  channel, int  value  )

inlinevirtual

Implements DriverPWMBase.

setBuffer()

void setBuffer ( BaseBuffer< uint8_t > *  buffer )

inlineinherited

You can assign your own custom buffer impelementation: must be allocated on the heap and will be cleaned up by this class

setupPWM()

void setupPWM ( )

inlinevirtual

Setup LED PWM.

Implements DriverPWMBase.

setupTimer()

void setupTimer ( )

inlinevirtual

Implements DriverPWMBase.

startTimer()

void startTimer ( )

inlinevirtual

Implements DriverPWMBase.

Friends And Related Symbol Documentation

defaultPWMAudioOutputCallback

void defaultPWMAudioOutputCallback ( )

friend

separate method that can be defined as friend so that we can access protected information

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

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