Private Functions

Functions
static uint8_t	AUDIO_SAIx_Init (uint32_t AudioFreq)
	Initializes the Audio Codec audio interface (SAI).
static uint8_t	AUDIO_SAIx_DeInit (void)
	De-initializes the Audio Codec audio interface (SAI).
static uint8_t	AUDIO_DFSDMx_Init (uint32_t AudioFreq)
	Initializes the Digital Filter for Sigma-Delta Modulators interface (DFSDM).
static uint8_t	AUDIO_DFSDMx_DeInit (void)
	De-initializes the Digital Filter for Sigma-Delta Modulators interface (DFSDM).
static uint8_t	AUDIO_SAIPLLConfig (uint32_t Frequency)
	Configures the SAI PLL clock according to the required audio frequency.
void	HAL_SAI_MspInit (SAI_HandleTypeDef *hsai)
	SAI MSP Init.
void	HAL_SAI_MspDeInit (SAI_HandleTypeDef *hsai)
	SAI MSP De-init.
void	HAL_DFSDM_ChannelMspInit (DFSDM_Channel_HandleTypeDef *hdfsdm_channel)
	Initializes the DFSDM channel MSP.
void	HAL_DFSDM_ChannelMspDeInit (DFSDM_Channel_HandleTypeDef *hdfsdm_channel)
	De-initializes the DFSDM channel MSP.
void	HAL_DFSDM_FilterMspInit (DFSDM_Filter_HandleTypeDef *hdfsdm_filter)
	Initializes the DFSDM filter MSP.
void	HAL_DFSDM_FilterMspDeInit (DFSDM_Filter_HandleTypeDef *hdfsdm_filter)
	De-initializes the DFSDM filter MSP.

---

Function Documentation

static uint8_t AUDIO_DFSDMx_DeInit

(

void

)

[static]

De-initializes the Digital Filter for Sigma-Delta Modulators interface (DFSDM).

Return values:

BSP	AUDIO status

Definition at line 1828 of file stm32l4r9i_discovery_audio.c.

References AUDIO_ERROR, AUDIO_OK, BSP_AUDIO_hDfsdmLeftFilter, BSP_AUDIO_hDfsdmRightFilter, AUDIO_IN_TypeDef::hDfsdmLeftChannel, AUDIO_IN_TypeDef::hDfsdmRightChannel, INPUT_DEVICE_DIGITAL_MIC1, INPUT_DEVICE_DIGITAL_MIC2, and AUDIO_IN_TypeDef::InputDevice.

Referenced by BSP_AUDIO_IN_DeInit(), and BSP_AUDIO_IN_SetFrequency().

static uint8_t AUDIO_DFSDMx_Init

(

uint32_t

AudioFreq

)

[static]

Initializes the Digital Filter for Sigma-Delta Modulators interface (DFSDM).

Parameters:

AudioFreq,:

Audio frequency to be used to set correctly the DFSDM peripheral.

Return values:

BSP	AUDIO status

Definition at line 1696 of file stm32l4r9i_discovery_audio.c.

References AUDIO_ERROR, AUDIO_OK, BSP_AUDIO_hDfsdmLeftFilter, BSP_AUDIO_hDfsdmRightFilter, DFSDMClockDivider, DFSDMFilterOrder, DFSDMOverSampling, DFSDMRightBitShift, AUDIO_IN_TypeDef::hDfsdmLeftChannel, AUDIO_IN_TypeDef::hDfsdmRightChannel, INPUT_DEVICE_DIGITAL_MIC1, INPUT_DEVICE_DIGITAL_MIC2, and AUDIO_IN_TypeDef::InputDevice.

Referenced by BSP_AUDIO_IN_InitEx(), and BSP_AUDIO_IN_SetFrequency().

static uint8_t AUDIO_SAIPLLConfig

(

uint32_t

Frequency

)

[static]

Configures the SAI PLL clock according to the required audio frequency.

Parameters:

Frequency,:

Audio frequency.

Return values:

BSP	AUDIO status

Note:

The SAI PLL input clock must be configured in the user application. The SAI PLL configuration done within this function assumes that the SAI PLL input clock runs at 4 MHz.

Definition at line 2035 of file stm32l4r9i_discovery_audio.c.

References AUDIO_ERROR, and AUDIO_OK.

Referenced by BSP_AUDIO_IN_InitEx(), BSP_AUDIO_IN_SetFrequency(), BSP_AUDIO_OUT_Init(), and BSP_AUDIO_OUT_SetFrequency().

static uint8_t AUDIO_SAIx_DeInit

(

void

)

[static]

De-initializes the Audio Codec audio interface (SAI).

Return values:

BSP	AUDIO status

Definition at line 1533 of file stm32l4r9i_discovery_audio.c.

References AUDIO_ERROR, AUDIO_OK, BSP_AUDIO_hSai_Rx, and BSP_AUDIO_hSai_Tx.

Referenced by BSP_AUDIO_IN_DeInit(), and BSP_AUDIO_OUT_DeInit().

static uint8_t AUDIO_SAIx_Init

(

uint32_t

AudioFreq

)

[static]

Initializes the Audio Codec audio interface (SAI).

Parameters:

AudioFreq,:

Audio frequency to be configured for the SAI peripheral.

Return values:

BSP	AUDIO status

Definition at line 1404 of file stm32l4r9i_discovery_audio.c.

References AUDIO_ERROR, AUDIO_OK, BSP_AUDIO_hSai_Rx, BSP_AUDIO_hSai_Tx, and SAIClockDivider.

Referenced by BSP_AUDIO_IN_InitEx(), and BSP_AUDIO_OUT_Init().

void HAL_DFSDM_ChannelMspDeInit

(

DFSDM_Channel_HandleTypeDef *

hdfsdm_channel

)

De-initializes the DFSDM channel MSP.

Parameters:

hdfsdm_channel

: DFSDM channel handle.

Return values:

None

Definition at line 1912 of file stm32l4r9i_discovery_audio.c.

References INPUT_DEVICE_DIGITAL_MIC1, INPUT_DEVICE_DIGITAL_MIC2, and AUDIO_IN_TypeDef::InputDevice.

void HAL_DFSDM_ChannelMspInit

(

DFSDM_Channel_HandleTypeDef *

hdfsdm_channel

)

Initializes the DFSDM channel MSP.

Parameters:

hdfsdm_channel

: DFSDM channel handle.

Return values:

None

Definition at line 1874 of file stm32l4r9i_discovery_audio.c.

References INPUT_DEVICE_DIGITAL_MIC1, INPUT_DEVICE_DIGITAL_MIC2, and AUDIO_IN_TypeDef::InputDevice.

void HAL_DFSDM_FilterMspDeInit

(

DFSDM_Filter_HandleTypeDef *

hdfsdm_filter

)

De-initializes the DFSDM filter MSP.

Parameters:

hdfsdm_filter

: DFSDM filter handle.

Return values:

None

Definition at line 2007 of file stm32l4r9i_discovery_audio.c.

References AUDIO_IN_TypeDef::hDmaDfsdmLeft, and AUDIO_IN_TypeDef::hDmaDfsdmRight.

void HAL_DFSDM_FilterMspInit

(

DFSDM_Filter_HandleTypeDef *

hdfsdm_filter

)

Initializes the DFSDM filter MSP.

Parameters:

hdfsdm_filter

: DFSDM filter handle.

Return values:

None

Definition at line 1935 of file stm32l4r9i_discovery_audio.c.

References AUDIO_IN_TypeDef::hDmaDfsdmLeft, AUDIO_IN_TypeDef::hDmaDfsdmRight, INPUT_DEVICE_DIGITAL_MIC2, and AUDIO_IN_TypeDef::InputDevice.

void HAL_SAI_MspDeInit

(

SAI_HandleTypeDef *

hsai

)

SAI MSP De-init.

Parameters:

hsai	: pointer to a SAI_HandleTypeDef structure

Return values:

None

Definition at line 1644 of file stm32l4r9i_discovery_audio.c.

References hDmaSaiRx, and hDmaSaiTx.

void HAL_SAI_MspInit

(

SAI_HandleTypeDef *

hsai

)

SAI MSP Init.

Parameters:

hsai	: pointer to a SAI_HandleTypeDef structure

Return values:

None

Definition at line 1557 of file stm32l4r9i_discovery_audio.c.

References hDmaSaiRx, and hDmaSaiTx.