Private Functions

Functions
static void	AUDIO_CODEC_Reset (void)
	Resets the audio codec.
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 void AUDIO_CODEC_Reset

(

void

)

[static]

Resets the audio codec.

It restores the default configuration of the codec (this function shall be called before initializing the codec).

Return values:

None

Definition at line 1136 of file stm32l476g_discovery_audio.c.

References AUDIO_I2C_ADDRESS, and AUDIO_OUT_TypeDef::AudioDrv.

Referenced by BSP_AUDIO_OUT_Init().

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 1220 of file stm32l476g_discovery_audio.c.

References AUDIO_DFSDMx_CLK_DISABLE, AUDIO_ERROR, AUDIO_OK, AUDIO_SAIx_PLL_DISABLE, BSP_AUDIO_hDfsdmLeftFilter, and AUDIO_IN_TypeDef::hDfsdmLeftChannel.

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 1157 of file stm32l476g_discovery_audio.c.

References AUDIO_DFSDMx_LEFT_FILTER, AUDIO_ERROR, AUDIO_OK, BSP_AUDIO_hDfsdmLeftFilter, DFSDMClockDivider, DFSDMFilterOrder, DFSDMOverSampling, DFSDMRightBitShift, and AUDIO_IN_TypeDef::hDfsdmLeftChannel.

Referenced by BSP_AUDIO_IN_Init(), 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 8 MHz.

Definition at line 1363 of file stm32l476g_discovery_audio.c.

References AUDIO_ERROR, and AUDIO_OK.

Referenced by BSP_AUDIO_IN_Init(), 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 1029 of file stm32l476g_discovery_audio.c.

References AUDIO_ERROR, AUDIO_OK, AUDIO_SAIx_PLL_DISABLE, and BSP_AUDIO_hSai.

Referenced by 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.

Note:

The default SlotActive configuration is set to CODEC_AUDIOFRAME_SLOT_0123 and user can update this configuration using

Return values:

BSP	AUDIO status

Definition at line 963 of file stm32l476g_discovery_audio.c.

References AUDIO_ERROR, AUDIO_OK, AUDIO_SAIx, BSP_AUDIO_hSai, and SAIClockDivider.

Referenced by 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 1279 of file stm32l476g_discovery_audio.c.

References AUDIO_DFSDMx_CKOUT_DMIC_DATIN_GPIO_CLK_ENABLE, AUDIO_DFSDMx_CKOUT_DMIC_DATIN_GPIO_PORT, AUDIO_DFSDMx_CKOUT_PIN, and AUDIO_DFSDMx_DMIC_DATIN_PIN.

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 1255 of file stm32l476g_discovery_audio.c.

References AUDIO_DFSDMx_CKOUT_DMIC_DATIN_AF, AUDIO_DFSDMx_CKOUT_DMIC_DATIN_GPIO_CLK_ENABLE, AUDIO_DFSDMx_CKOUT_DMIC_DATIN_GPIO_PORT, AUDIO_DFSDMx_CKOUT_PIN, AUDIO_DFSDMx_CLK_ENABLE, and AUDIO_DFSDMx_DMIC_DATIN_PIN.

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 1343 of file stm32l476g_discovery_audio.c.

References AUDIO_DFSDMx_DMAx_CLK_DISABLE, AUDIO_DFSDMx_DMAx_LEFT_IRQ, and AUDIO_IN_TypeDef::hDmaDfsdmLeft.

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 1304 of file stm32l476g_discovery_audio.c.

References AUDIO_DFSDMx_CLK_ENABLE, AUDIO_DFSDMx_DMAx_CLK_ENABLE, AUDIO_DFSDMx_DMAx_LEFT_CHANNEL, AUDIO_DFSDMx_DMAx_LEFT_IRQ, AUDIO_DFSDMx_DMAx_MEM_DATA_SIZE, AUDIO_DFSDMx_DMAx_PERIPH_DATA_SIZE, AUDIO_OUT_IRQ_PREPRIO, and AUDIO_IN_TypeDef::hDmaDfsdmLeft.

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 1109 of file stm32l476g_discovery_audio.c.

References AUDIO_SAIx_CLK_DISABLE, AUDIO_SAIx_DMAx_CLK_DISABLE, AUDIO_SAIx_DMAx_IRQ, AUDIO_SAIx_FS_PIN, AUDIO_SAIx_MCK_PIN, AUDIO_SAIx_MCK_SCK_SD_FS_DISABLE, AUDIO_SAIx_MCK_SCK_SD_FS_GPIO_PORT, AUDIO_SAIx_SCK_PIN, AUDIO_SAIx_SD_PIN, and hDmaSai.

void HAL_SAI_MspInit

(

SAI_HandleTypeDef *

hsai

)

SAI MSP Init.

Parameters:

hsai	: pointer to a SAI_HandleTypeDef structure

Return values:

None

Definition at line 1054 of file stm32l476g_discovery_audio.c.

References AUDIO_OUT_IRQ_PREPRIO, AUDIO_SAIx, AUDIO_SAIx_CLK_ENABLE, AUDIO_SAIx_DMAx_CHANNEL, AUDIO_SAIx_DMAx_CLK_ENABLE, AUDIO_SAIx_DMAx_IRQ, AUDIO_SAIx_DMAx_MEM_DATA_SIZE, AUDIO_SAIx_DMAx_PERIPH_DATA_SIZE, AUDIO_SAIx_FS_PIN, AUDIO_SAIx_MCK_PIN, AUDIO_SAIx_MCK_SCK_SD_FS_AF, AUDIO_SAIx_MCK_SCK_SD_FS_ENABLE, AUDIO_SAIx_MCK_SCK_SD_FS_GPIO_PORT, AUDIO_SAIx_SCK_PIN, AUDIO_SAIx_SD_PIN, and hDmaSai.