STM324x9I EVAL AUDIO OUT Exported Functions

Functions
uint8_t	BSP_AUDIO_OUT_Init (uint16_t OutputDevice, uint8_t Volume, uint32_t AudioFreq)
	Configures the audio peripherals.
uint8_t	BSP_AUDIO_OUT_Play (uint16_t *pBuffer, uint32_t Size)
	Starts playing audio stream from a data buffer for a determined size.
void	BSP_AUDIO_OUT_ChangeBuffer (uint16_t *pData, uint16_t Size)
	Sends n-Bytes on the SAI interface.
uint8_t	BSP_AUDIO_OUT_Pause (void)
	This function Pauses the audio file stream.
uint8_t	BSP_AUDIO_OUT_Resume (void)
	This function Resumes the audio file stream.
uint8_t	BSP_AUDIO_OUT_Stop (uint32_t Option)
	Stops audio playing and Power down the Audio Codec.
uint8_t	BSP_AUDIO_OUT_SetVolume (uint8_t Volume)
	Controls the current audio volume level.
void	BSP_AUDIO_OUT_SetFrequency (uint32_t AudioFreq)
	Updates the audio frequency.
void	BSP_AUDIO_OUT_SetAudioFrameSlot (uint32_t AudioFrameSlot)
	Updates the Audio frame slot configuration.
uint8_t	BSP_AUDIO_OUT_SetMute (uint32_t Cmd)
	Enables or disables the MUTE mode by software.
uint8_t	BSP_AUDIO_OUT_SetOutputMode (uint8_t Output)
	Switch dynamically (while audio file is played) the output target (speaker or headphone).
void	BSP_AUDIO_OUT_TransferComplete_CallBack (void)
	Manages the DMA full Transfer complete event.
void	BSP_AUDIO_OUT_HalfTransfer_CallBack (void)
	Manages the DMA Half Transfer complete event.
void	BSP_AUDIO_OUT_Error_CallBack (void)
	Manages the DMA FIFO error event.

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Function Documentation

void BSP_AUDIO_OUT_ChangeBuffer	(	uint16_t *	pData,
		uint16_t	Size
	)

Sends n-Bytes on the SAI interface.

Parameters:

pData,:	pointer on data address
Size,:	number of data to be written

Definition at line 281 of file stm324x9i_eval_audio.c.

References haudio_out_sai.

void BSP_AUDIO_OUT_Error_CallBack

(

void

)

Manages the DMA FIFO error event.

Definition at line 543 of file stm324x9i_eval_audio.c.

Referenced by HAL_SAI_ErrorCallback().

void BSP_AUDIO_OUT_HalfTransfer_CallBack

(

void

)

Manages the DMA Half Transfer complete event.

Definition at line 536 of file stm324x9i_eval_audio.c.

Referenced by HAL_SAI_TxHalfCpltCallback().

uint8_t BSP_AUDIO_OUT_Init	(	uint16_t	OutputDevice,
		uint8_t	Volume,
		uint32_t	AudioFreq
	)

Configures the audio peripherals.

Parameters:

OutputDevice,:	OUTPUT_DEVICE_SPEAKER, OUTPUT_DEVICE_HEADPHONE, or OUTPUT_DEVICE_BOTH.
Volume,:	Initial volume level (from 0 (Mute) to 100 (Max))
AudioFreq,:	Audio frequency used to play the audio stream.

Note:

The I2S PLL input clock must be done in the user application.

Return values:

AUDIO_OK

if correct communication, else wrong communication

Definition at line 195 of file stm324x9i_eval_audio.c.

References audio_drv, AUDIO_ERROR, AUDIO_I2C_ADDRESS, AUDIO_OK, and SAIx_Init().

uint8_t BSP_AUDIO_OUT_Pause

(

void

)

This function Pauses the audio file stream.

In case of using DMA, the DMA Pause feature is used. WARNING: When calling BSP_AUDIO_OUT_Pause() function for pause, only BSP_AUDIO_OUT_Resume() function should be called for resume (use of BSP_AUDIO_OUT_Play() function for resume could lead to unexpected behavior).

Return values:

AUDIO_OK

if correct communication, else wrong communication

Definition at line 294 of file stm324x9i_eval_audio.c.

References audio_drv, AUDIO_ERROR, AUDIO_I2C_ADDRESS, AUDIO_OK, and haudio_out_sai.

uint8_t BSP_AUDIO_OUT_Play	(	uint16_t *	pBuffer,
		uint32_t	Size
	)

Starts playing audio stream from a data buffer for a determined size.

Parameters:

pBuffer,:	Pointer to the buffer
Size,:	Number of audio data BYTES.

Return values:

AUDIO_OK

if correct communication, else wrong communication

Definition at line 260 of file stm324x9i_eval_audio.c.

References audio_drv, AUDIO_ERROR, AUDIO_I2C_ADDRESS, AUDIO_OK, AUDIODATA_SIZE, DMA_MAX, and haudio_out_sai.

uint8_t BSP_AUDIO_OUT_Resume

(

void

)

This function Resumes the audio file stream.

WARNING: When calling BSP_AUDIO_OUT_Pause() function for pause, only BSP_AUDIO_OUT_Resume() function should be called for resume (use of BSP_AUDIO_OUT_Play() function for resume could lead to unexpected behavior).

Return values:

AUDIO_OK

if correct communication, else wrong communication

Definition at line 318 of file stm324x9i_eval_audio.c.

References audio_drv, AUDIO_ERROR, AUDIO_I2C_ADDRESS, AUDIO_OK, and haudio_out_sai.

void BSP_AUDIO_OUT_SetAudioFrameSlot

(

uint32_t

AudioFrameSlot

)

Updates the Audio frame slot configuration.

Parameters:

AudioFrameSlot,:

specifies the audio Frame slot This parameter can be any value of CODEC AudioFrame SLOT TDMMode

Note:

This API should be called after the BSP_AUDIO_OUT_Init() to adjust the audio frame slot.

Definition at line 482 of file stm324x9i_eval_audio.c.

References haudio_out_sai.

void BSP_AUDIO_OUT_SetFrequency

(

uint32_t

AudioFreq

)

Updates the audio frequency.

Parameters:

AudioFreq,:

Audio frequency used to play the audio stream.

Note:

This API should be called after the BSP_AUDIO_OUT_Init() to adjust the audio frequency.

Definition at line 433 of file stm324x9i_eval_audio.c.

References haudio_out_sai.

uint8_t BSP_AUDIO_OUT_SetMute

(

uint32_t

Cmd

)

Enables or disables the MUTE mode by software.

Parameters:

Cmd,:

Could be AUDIO_MUTE_ON to mute sound or AUDIO_MUTE_OFF to unmute the codec and restore previous volume level.

Return values:

AUDIO_OK

if correct communication, else wrong communication

Definition at line 392 of file stm324x9i_eval_audio.c.

References audio_drv, AUDIO_ERROR, AUDIO_I2C_ADDRESS, and AUDIO_OK.

uint8_t BSP_AUDIO_OUT_SetOutputMode

(

uint8_t

Output

)

Switch dynamically (while audio file is played) the output target (speaker or headphone).

Parameters:

Output,:

The audio output target: OUTPUT_DEVICE_SPEAKER, OUTPUT_DEVICE_HEADPHONE or OUTPUT_DEVICE_BOTH

Return values:

AUDIO_OK

if correct communication, else wrong communication

Definition at line 413 of file stm324x9i_eval_audio.c.

References audio_drv, AUDIO_ERROR, AUDIO_I2C_ADDRESS, and AUDIO_OK.

uint8_t BSP_AUDIO_OUT_SetVolume

(

uint8_t

Volume

)

Controls the current audio volume level.

Parameters:

Volume,:

Volume level to be set in percentage from 0% to 100% (0 for Mute and 100 for Max volume level).

Return values:

AUDIO_OK

if correct communication, else wrong communication

Definition at line 372 of file stm324x9i_eval_audio.c.

References audio_drv, AUDIO_ERROR, AUDIO_I2C_ADDRESS, and AUDIO_OK.

uint8_t BSP_AUDIO_OUT_Stop

(

uint32_t

Option

)

Stops audio playing and Power down the Audio Codec.

Parameters:

Option,:

could be one of the following parameters CODEC_PDWN_SW: for software power off (by writing registers). Then no need to reconfigure the Codec after power on. CODEC_PDWN_HW: completely shut down the codec (physically). Then need to reconfigure the Codec after power on.

Return values:

AUDIO_OK

if correct communication, else wrong communication

Definition at line 344 of file stm324x9i_eval_audio.c.

References audio_drv, AUDIO_ERROR, AUDIO_I2C_ADDRESS, AUDIO_OK, and haudio_out_sai.

void BSP_AUDIO_OUT_TransferComplete_CallBack

(

void

)

Manages the DMA full Transfer complete event.

Definition at line 529 of file stm324x9i_eval_audio.c.

Referenced by HAL_SAI_TxCpltCallback().