vexaudio.c File Reference

DAC port driver. More...

#include "ch.h"
#include "hal.h"
#include "vex.h"

Macros
#define	WAVE_SAMPLES   32
#define	AUDIO_WA_SIZE   THD_WA_SIZE(AUDIO_TASK_STACK_SIZE)

Functions
void	vexAudioPlaySound (int freq, int amplitude, int timems)
	Play frequency at given amplitude. More...
void	vexAudioPlaySoundWait (int freq, int amplitude, int timems)
	Play frequency at given amplitude and wait for completion. More...
void	vexAudioStopSound ()
	Stop sound playing. More...
int	vexAudioInitChipToneSong (int len)
	Initialize a chiptone song. More...
void	vexAudioDeinitChipToneSong ()
	Free memory occupied by a song. More...
void	vexAudioStartChipToneSong (int repeat)
	Start playback of the song. More...
void	vexAudioStopChipToneSong ()
	Stop playback of the song. More...
void	vexAudioSetNextChipTone (int freq, int amplitude, int timems)
	Add a tone to the array for the song. More...
void	vexAudioDebugChipTone ()
	Print out the song data for debug. More...

Detailed Description

DAC port driver.

Macro Definition Documentation

#define WAVE_SAMPLES   32

#define AUDIO_WA_SIZE   THD_WA_SIZE(AUDIO_TASK_STACK_SIZE)

Function Documentation

void vexAudioPlaySound	(	int	freq,
		int	amplitude,
		int	timems
	)

Play frequency at given amplitude.

Parameters

[in]	freq	desired frequency in Hz
[in]	amplitude	desired amplitude 0 = silence, 128 = max
[in]	timems	duration of tone

This is the base function that all sound playback uses. The first time this is called all the DAC and DMA initialization is done, a thread is created to stop the sound after the requested playback time

void vexAudioPlaySoundWait	(	int	freq,
		int	amplitude,
		int	timems
	)

Play frequency at given amplitude and wait for completion.

void vexAudioStopSound

(

void

)

Stop sound playing.

This clears the counter used for tone duration and resets the semaphore the audio task is blocking on causing it to wake.

int vexAudioInitChipToneSong

(

int

len)

Initialize a chiptone song.

Parameters

[in]

len

number of tones in the song

Initalize a chiptone song, allocate memory and clear all variables memory will be reused for subsequent songs if there is enough space to avoid multiple calls to malloc/free

void vexAudioDeinitChipToneSong

(

void

)

Free memory occupied by a song.

void vexAudioStartChipToneSong

(

int

repeat)

Start playback of the song.

void vexAudioStopChipToneSong

(

void

)

Stop playback of the song.

void vexAudioSetNextChipTone	(	int	freq,
		int	amplitude,
		int	timems
	)

Add a tone to the array for the song.

Parameters

[in]	freq	desired frequency in Hz
[in]	amplitude	desired amplitude 0 = silence, 128 = max
[in]	timems	duration of tone

void vexAudioDebugChipTone

(

void

)

Print out the song data for debug.