Functions

General Description

Functions
cy_en_pdm_pcm_status_t	Cy_PDM_PCM_Channel_Init (PDM_Type *base, cy_stc_pdm_pcm_channel_config_t const *channel_config, uint8_t channel_num)
	Initialize the PDM-PCM Channel. More...
void	Cy_PDM_PCM_Channel_DeInit (PDM_Type *base, uint8_t channel_num)
	Uninitializes the PDM-PCM channel. More...
cy_en_pdm_pcm_status_t	Cy_PDM_PCM_Init (PDM_Type *base, cy_stc_pdm_pcm_config_v2_t const *config)
	Initializes the PDM-PCM module. More...
void	Cy_PDM_PCM_DeInit (PDM_Type *base)
	Uninitializes the PDM-PCM module. More...
cy_en_pdm_pcm_status_t	Cy_PDM_PCM_test_Init (PDM_Type *base, cy_stc_pdm_pcm_config_v2_t const *config, cy_stc_test_config_t const *test_config)
	Initializes the PDM-PCM module test mode. More...
cy_en_pdm_pcm_status_t	Cy_PDM_PCM_SetGain (PDM_Type *base, uint8_t channel_num, cy_en_pdm_pcm_gain_sel_t gain)
	Sets the gain factor for the given channel. More...
__STATIC_INLINE void	Cy_PDM_PCM_Activate_Channel (PDM_Type *base, uint8_t channel_num)
	Activates the PDM-PCM channel. More...
__STATIC_INLINE void	Cy_PDM_PCM_DeActivate_Channel (PDM_Type *base, uint8_t channel_num)
	DeActivates the PDM-PCM channel. More...
__STATIC_INLINE void	Cy_PDM_PCM_SetRateSampling (PDM_Type *base, cy_en_pdm_pcm_halve_rate_sel_t rate)
	Sets Halve rate Sampling rate. More...
__STATIC_INLINE void	Cy_PDM_PCM_Channel_Enable (PDM_Type *base, uint8_t channel_num)
	Enables the PDM-PCM data conversion. More...
__STATIC_INLINE void	Cy_PDM_PCM_Channel_Disable (PDM_Type *base, uint8_t channel_num)
	Disables the PDM-PCM data conversion. More...
__STATIC_INLINE void	Cy_PDM_PCM_Channel_Set_Cic_DecimCode (PDM_Type *base, uint8_t channel_num, cy_en_pdm_pcm_ch_cic_decimcode_t decimcode)
	Sets PDM-PCM CIC Filter Decimation code. More...
__STATIC_INLINE void	Cy_PDM_PCM_Channel_Set_Fir0 (PDM_Type *base, uint8_t channel_num, cy_en_pdm_pcm_ch_fir0_decimcode_t decimcode, uint8_t scale)
	Sets PDM-PCM FIR0 Filter Decim code and Scale. More...
__STATIC_INLINE void	Cy_PDM_PCM_Channel_Set_Fir1 (PDM_Type *base, uint8_t channel_num, cy_en_pdm_pcm_ch_fir1_decimcode_t decimcode, uint8_t scale)
	Sets PDM-PCM FIR1 Filter Decimation code and Scale. More...
__STATIC_INLINE void	Cy_PDM_PCM_Channel_Set_DCblock (PDM_Type *base, uint8_t channel_num, cy_en_pdm_pcm_ch_dcblock_coef_t coef)
	Sets the DC blocker filter with programmable coefficient. More...
__STATIC_INLINE void	Cy_PDM_PCM_Channel_SetInterruptMask (PDM_Type *base, uint8_t channel_num, uint32_t interrupt)
	Sets one or more PDM-PCM interrupt factor bits (sets the INTR_MASK register). More...
__STATIC_INLINE uint32_t	Cy_PDM_PCM_Channel_GetInterruptMask (PDM_Type const *base, uint8_t channel_num)
	Returns the PDM-PCM interrupt mask (a content of the INTR_MASK register). More...
__STATIC_INLINE uint32_t	Cy_PDM_PCM_Channel_GetInterruptStatusMasked (PDM_Type const *base, uint8_t channel_num)
	Reports the status of enabled (masked) PDM-PCM interrupt sources. More...
__STATIC_INLINE uint32_t	Cy_PDM_PCM_Channel_GetInterruptStatus (PDM_Type const *base, uint8_t channel_num)
	Reports the status of PDM-PCM interrupt sources (an INTR register). More...
__STATIC_INLINE void	Cy_PDM_PCM_Channel_ClearInterrupt (PDM_Type *base, uint8_t channel_num, uint32_t interrupt)
	Clears one or more PDM-PCM interrupt statuses (sets an INTR register's bits). More...
__STATIC_INLINE void	Cy_PDM_PCM_Channel_SetInterrupt (PDM_Type *base, uint8_t channel_num, uint32_t interrupt)
	Sets one or more interrupt source statuses (sets an INTR_SET register). More...
__STATIC_INLINE uint8_t	Cy_PDM_PCM_Channel_GetNumInFifo (PDM_Type const *base, uint8_t channel_num)
	Reports the current number of used words in the output data FIFO. More...
__STATIC_INLINE uint32_t	Cy_PDM_PCM_Channel_ReadFifo (PDM_Type const *base, uint8_t channel_num)
	Reads ("pops") one word from the output data FIFO. More...
__STATIC_INLINE void	Cy_PDM_PCM_Channel_FreezeFifo (PDM_Type *base, uint8_t channel_num)
	Freezes the RX FIFO (Debug purpose). More...
__STATIC_INLINE void	Cy_PDM_PCM_Channel_UnfreezeFifo (PDM_Type *base, uint8_t channel_num)
	Unfreezes the RX FIFO (Debug purpose). More...
__STATIC_INLINE uint32_t	Cy_PDM_PCM_Channel_ReadFifoSilent (PDM_Type const *base, uint8_t channel_num)
	Reads the RX FIFO silent (without touching the FIFO function). More...
__STATIC_INLINE void	Cy_PDM_PCM_DCBlock_Enable (PDM_Type *base, uint8_t channel_num)
	Enable DC Block Filter for the given channel. More...
__STATIC_INLINE void	Cy_PDM_PCM_DCBlock_Disable (PDM_Type *base, uint8_t channel_num)
	Disable DC Block Filter for the given channel. More...
cy_en_pdm_pcm_status_t	Cy_PDM_PCM_SetFIR0_Scale (PDM_Type *base, uint8_t channel_num, cy_en_pdm_pcm_gain_sel_t scale)
	Sets the FIR0 Scale factor for the given channel. More...
cy_en_pdm_pcm_status_t	Cy_PDM_PCM_ApplyPCM_Gain (const int32_t *in_sample, int32_t gain_db, cy_en_pdm_pcm_format_t out_format, int32_t *out_sample)
	This function applies gain in software to one 24-bit PCM sample data output PCM format can be 24-bit or 16-bit, gain should be in the range of -40db to 40db. More...
__STATIC_INLINE bool	Cy_PDM_PCM_Channel_GetCurrentState (PDM_Type const *base, uint8_t channel_num)
	Returns the current PDM-PCM state (active/stopped). More...

Function Documentation

Cy_PDM_PCM_Channel_Init()

cy_en_pdm_pcm_status_t Cy_PDM_PCM_Channel_Init	(	PDM_Type *	base,
		cy_stc_pdm_pcm_channel_config_t const *	channel_config,
		uint8_t	channel_num
	)

Initialize the PDM-PCM Channel.

Precondition

Make sure PDM-PCM is initialized before calling this function. Cy_PDM_PCM_Init

Parameters

base	The pointer to the PDM-PCM instance address
channel_config	The pointer to a configuration structure.
channel_num	The channel number to be initialized.

Returns

error / status code. See cy_en_pdm_pcm_status_t.

Function Usage

    uint8_t channel_num = 0U;
    Cy_PDM_PCM_Channel_Init(PDM0, &channel_0_config, channel_num);
 

Cy_PDM_PCM_Channel_DeInit()

void Cy_PDM_PCM_Channel_DeInit	(	PDM_Type *	base,
		uint8_t	channel_num
	)

Uninitializes the PDM-PCM channel.

Parameters

base	The pointer to the PDM-PCM instance address.
channel_num	channel number to be de initialized.

Function Usage

    uint8_t channel_num = 0U;
    Cy_PDM_PCM_Channel_DeInit(PDM0, &channel_0_config, channel_num);
 

Cy_PDM_PCM_Init()

cy_en_pdm_pcm_status_t Cy_PDM_PCM_Init	(	PDM_Type *	base,
		cy_stc_pdm_pcm_config_v2_t const *	config
	)

Initializes the PDM-PCM module.

Parameters

base	The pointer to the PDM-PCM instance address
config	The pointer to a configuration structure. cy_stc_pdm_pcm_config_v2_t

Returns

error / status code. See cy_en_pdm_pcm_status_t.

Function Usage

    status = Cy_PDM_PCM_Init(PDM0, &pdm_0_config);
    if(CY_PDM_PCM_SUCCESS != status)
    {
        //handle Error
    }

Cy_PDM_PCM_DeInit()

void Cy_PDM_PCM_DeInit

(

PDM_Type *

base

)

Uninitializes the PDM-PCM module.

Parameters

base	The pointer to the PDM-PCM instance address.

Function Usage

    Cy_PDM_PCM_DeInit(PDM0);
 

Cy_PDM_PCM_test_Init()

cy_en_pdm_pcm_status_t Cy_PDM_PCM_test_Init	(	PDM_Type *	base,
		cy_stc_pdm_pcm_config_v2_t const *	config,
		cy_stc_test_config_t const *	test_config
	)

Initializes the PDM-PCM module test mode.

Parameters

base	The pointer to the PDM-PCM instance address
config	The pointer to a configuration structure. cy_stc_pdm_pcm_config_v2_t
test_config	test Mode configuration. cy_stc_test_config_t

Returns

error / status code. See cy_en_pdm_pcm_status_t.

Cy_PDM_PCM_SetGain()

cy_en_pdm_pcm_status_t Cy_PDM_PCM_SetGain	(	PDM_Type *	base,
		uint8_t	channel_num,
		cy_en_pdm_pcm_gain_sel_t	gain
	)

Sets the gain factor for the given channel.

Parameters

base	The pointer to the PDM-PCM instance address.
channel_num	The channel number for gain setting.
gain	Gain value defined as cy_en_pdm_pcm_gain_scale_t

Cy_PDM_PCM_Activate_Channel()

__STATIC_INLINE void Cy_PDM_PCM_Activate_Channel	(	PDM_Type *	base,
		uint8_t	channel_num
	)

Activates the PDM-PCM channel.

Parameters

base	The pointer to the PDM-PCM instance address.
channel_num	Channel number to be activated

Function Usage

    uint8_t channel_num = 0U;
    Cy_PDM_PCM_Activate_Channel(PDM0, channel_num);
 

Cy_PDM_PCM_DeActivate_Channel()

__STATIC_INLINE void Cy_PDM_PCM_DeActivate_Channel	(	PDM_Type *	base,
		uint8_t	channel_num
	)

DeActivates the PDM-PCM channel.

Parameters

base	The pointer to the PDM-PCM instance address.
channel_num	Channel number to be deactivated

Function Usage

    uint8_t channel_num = 0U;
    Cy_PDM_PCM_DeActivate_Channel(PDM0, channel_num);
 

Cy_PDM_PCM_SetRateSampling()

__STATIC_INLINE void Cy_PDM_PCM_SetRateSampling	(	PDM_Type *	base,
		cy_en_pdm_pcm_halve_rate_sel_t	rate
	)

Sets Halve rate Sampling rate.

Parameters

base	The pointer to the PDM-PCM instance address.
rate	Halve rate sampling or Full rate sampling cy_en_pdm_pcm_halve_rate_sel_t.

Function Usage

    Cy_PDM_PCM_SetRateSampling(PDM0, CY_PDM_PCM_RATE_FULL);
 

Cy_PDM_PCM_Channel_Enable()

__STATIC_INLINE void Cy_PDM_PCM_Channel_Enable	(	PDM_Type *	base,
		uint8_t	channel_num
	)

Enables the PDM-PCM data conversion.

Parameters

base	The pointer to the PDM-PCM instance address.
channel_num	Channel number to be enabled

Function Usage

    uint8_t channel_num = 0U;
    Cy_PDM_PCM_Channel_Enable(PDM0, channel_num);
 

Cy_PDM_PCM_Channel_Disable()

__STATIC_INLINE void Cy_PDM_PCM_Channel_Disable	(	PDM_Type *	base,
		uint8_t	channel_num
	)

Disables the PDM-PCM data conversion.

Parameters

base	The pointer to the PDM-PCM instance address.
channel_num	Channel number to be disabled

Function Usage

    uint8_t channel_num = 0U;
    Cy_PDM_PCM_Channel_Disable(PDM0, channel_num);
 

Cy_PDM_PCM_Channel_Set_Cic_DecimCode()

__STATIC_INLINE void Cy_PDM_PCM_Channel_Set_Cic_DecimCode	(	PDM_Type *	base,
		uint8_t	channel_num,
		cy_en_pdm_pcm_ch_cic_decimcode_t	decimcode
	)

Sets PDM-PCM CIC Filter Decimation code.

Parameters

base	The pointer to the PDM-PCM instance address
channel_num	Channel number for which the CIC filter Decimation code to be set
decimcode	decimation code value to be set. cy_en_pdm_pcm_ch_cic_decimcode_t.

Function Usage

    uint8_t channel_num = 0U;
    Cy_PDM_PCM_Channel_Set_Cic_DecimCode(PDM0, channel_num, CY_PDM_PCM_CHAN_CIC_DECIM_8);
 

Cy_PDM_PCM_Channel_Set_Fir0()

__STATIC_INLINE void Cy_PDM_PCM_Channel_Set_Fir0	(	PDM_Type *	base,
		uint8_t	channel_num,
		cy_en_pdm_pcm_ch_fir0_decimcode_t	decimcode,
		uint8_t	scale
	)

Sets PDM-PCM FIR0 Filter Decim code and Scale.

The FIR filter coefficients have no default values: the coefficients MUST be programmed BEFORE the filter is enabled. By Default FIR0 is disabled and is only used for 8Khz and 16 Khz sample frequencies. For other frequencies it is a pass through.

Parameters

base	The pointer to the PDM-PCM instance address
channel_num	Channel number for which the FIR0 Decimation code and the filter to be set.
decimcode	Decimation code value to be set. cy_en_pdm_pcm_ch_fir0_decimcode_t.
scale	Scale value to be set.

Function Usage

    uint8_t channel_num = 0U; // Channel number used.
    uint8_t scale = 22U; // scale should be in the range of 1 to 31
    Cy_PDM_PCM_Channel_Set_Fir0(PDM0, channel_num, CY_PDM_PCM_CHAN_FIR0_DECIM_4, scale);
 

Cy_PDM_PCM_Channel_Set_Fir1()

__STATIC_INLINE void Cy_PDM_PCM_Channel_Set_Fir1	(	PDM_Type *	base,
		uint8_t	channel_num,
		cy_en_pdm_pcm_ch_fir1_decimcode_t	decimcode,
		uint8_t	scale
	)

Sets PDM-PCM FIR1 Filter Decimation code and Scale.

Parameters

base	The pointer to the PDM-PCM instance address
channel_num	Channel number for which the FIR1 Decimation code and the filter to be set.
decimcode	Decimation code value to be set. cy_en_pdm_pcm_ch_fir1_decimcode_t.
scale	Scale value to be set.

Function Usage

    uint8_t channel_num = 0U; // Channel number used.
    uint8_t scale = 22U; // scale should be in the range of 1 to 31
    Cy_PDM_PCM_Channel_Set_Fir1(PDM0, channel_num, CY_PDM_PCM_CHAN_FIR1_DECIM_2, scale);
 

Cy_PDM_PCM_Channel_Set_DCblock()

__STATIC_INLINE void Cy_PDM_PCM_Channel_Set_DCblock	(	PDM_Type *	base,
		uint8_t	channel_num,
		cy_en_pdm_pcm_ch_dcblock_coef_t	coef
	)

Sets the DC blocker filter with programmable coefficient.

The filter is used to remove a DC component.

Parameters

base	The pointer to the PDM-PCM instance address
channel_num	Channel number for which DC block coef to be set.
coef	coef value to be set. cy_en_pdm_pcm_ch_dcblock_coef_t.

Function Usage

    uint8_t channel_num = 0U; // Channel number used.
    Cy_PDM_PCM_Channel_Set_DCblock(PDM0, channel_num, CY_PDM_PCM_CHAN_DCBLOCK_CODE_8);
 

Cy_PDM_PCM_Channel_SetInterruptMask()

__STATIC_INLINE void Cy_PDM_PCM_Channel_SetInterruptMask	(	PDM_Type *	base,
		uint8_t	channel_num,
		uint32_t	interrupt
	)

Sets one or more PDM-PCM interrupt factor bits (sets the INTR_MASK register).

Parameters

base	The pointer to the PDM-PCM instance address
channel_num	Channel number
interrupt	Interrupt bit mask Interrupt Masks.

Function Usage

    uint8_t channel_num = 0U;
    /* CY_PDM_PCM_INTR_MASK defines mask for all available interrupt sources.
       CY_PDM_PCM_INTR_RX_TRIGGER
       CY_PDM_PCM_INTR_RX_FIR_OVERFLOW
       CY_PDM_PCM_INTR_RX_OVERFLOW
       CY_PDM_PCM_INTR_RX_IF_OVERFLOW
       CY_PDM_PCM_INTR_RX_UNDERFLOW */
    Cy_PDM_PCM_Channel_SetInterruptMask(PDM0, channel_num, CY_PDM_PCM_INTR_MASK);
 

Cy_PDM_PCM_Channel_GetInterruptMask()

__STATIC_INLINE uint32_t Cy_PDM_PCM_Channel_GetInterruptMask	(	PDM_Type const *	base,
		uint8_t	channel_num
	)

Returns the PDM-PCM interrupt mask (a content of the INTR_MASK register).

Parameters

base	The pointer to the PDM-PCM instance address.
channel_num	Channel number

Returns

The interrupt bit mask Interrupt Masks.

Cy_PDM_PCM_Channel_GetInterruptStatusMasked()

__STATIC_INLINE uint32_t Cy_PDM_PCM_Channel_GetInterruptStatusMasked	(	PDM_Type const *	base,
		uint8_t	channel_num
	)

Reports the status of enabled (masked) PDM-PCM interrupt sources.

(an INTR_MASKED register).

Parameters

base	The pointer to the PDM-PCM instance address.
channel_num	Channel number

Returns

The interrupt bit mask Interrupt Masks.

Function Usage

    uint8_t channel_num = 0U;
    /* Cy_PDM_PCM_Init, Cy_PDM_PCM_Channel_Init and  Cy_PDM_PCM_Channel_Enable are pre-requisites */
    volatile uint32_t int_stat;
    int_stat = Cy_PDM_PCM_Channel_GetInterruptStatusMasked(PDM0, ch);
    if(CY_PDM_PCM_INTR_RX_TRIGGER & int_stat)
    {
        for(i=0; i < RX_FIFO_TRIG_LEVEL; i++)
        {
            int32_t data = (int32_t)Cy_PDM_PCM_Channel_ReadFifo(PDM0, ch);
            // data can be stored and used as pcm data
        }
    }
    Cy_PDM_PCM_Channel_ClearInterrupt(PDM0, channel_num, CY_PDM_PCM_INTR_MASK);

Cy_PDM_PCM_Channel_GetInterruptStatus()

__STATIC_INLINE uint32_t Cy_PDM_PCM_Channel_GetInterruptStatus	(	PDM_Type const *	base,
		uint8_t	channel_num
	)

Reports the status of PDM-PCM interrupt sources (an INTR register).

Parameters

base	The pointer to the PDM-PCM instance address.
channel_num	Channel number

Returns

The interrupt bit mask Interrupt Masks.

Function Usage

    uint8_t channel_num = 0U;
    /* Cy_PDM_PCM_Init, Cy_PDM_PCM_Channel_Init and  Cy_PDM_PCM_Channel_Enable are pre-requisites */
    volatile uint32_t int_stat;
    int_stat = Cy_PDM_PCM_Channel_GetInterruptStatusMasked(PDM0, ch);
    if(CY_PDM_PCM_INTR_RX_TRIGGER & int_stat)
    {
        for(i=0; i < RX_FIFO_TRIG_LEVEL; i++)
        {
            int32_t data = (int32_t)Cy_PDM_PCM_Channel_ReadFifo(PDM0, ch);
            // data can be stored and used as pcm data
        }
    }
    Cy_PDM_PCM_Channel_ClearInterrupt(PDM0, channel_num, CY_PDM_PCM_INTR_MASK);

Cy_PDM_PCM_Channel_ClearInterrupt()

__STATIC_INLINE void Cy_PDM_PCM_Channel_ClearInterrupt	(	PDM_Type *	base,
		uint8_t	channel_num,
		uint32_t	interrupt
	)

Clears one or more PDM-PCM interrupt statuses (sets an INTR register's bits).

Parameters

base	The pointer to the PDM-PCM instance address
channel_num	Channel number
interrupt	The interrupt bit mask Interrupt Masks.

Function Usage

    uint8_t channel_num = 0U;
    /* CY_PDM_PCM_INTR_MASK defines mask for all available interrupt sources.
       CY_PDM_PCM_INTR_RX_TRIGGER
       CY_PDM_PCM_INTR_RX_FIR_OVERFLOW
       CY_PDM_PCM_INTR_RX_OVERFLOW
       CY_PDM_PCM_INTR_RX_IF_OVERFLOW
       CY_PDM_PCM_INTR_RX_UNDERFLOW */
    Cy_PDM_PCM_Channel_ClearInterrupt(PDM0, channel_num, CY_PDM_PCM_INTR_MASK);
 

Cy_PDM_PCM_Channel_SetInterrupt()

__STATIC_INLINE void Cy_PDM_PCM_Channel_SetInterrupt	(	PDM_Type *	base,
		uint8_t	channel_num,
		uint32_t	interrupt
	)

Sets one or more interrupt source statuses (sets an INTR_SET register).

Parameters

base	The pointer to the PDM-PCM instance address.
channel_num	Channel number
interrupt	The interrupt bit mask Interrupt Masks.

Cy_PDM_PCM_Channel_GetNumInFifo()

__STATIC_INLINE uint8_t Cy_PDM_PCM_Channel_GetNumInFifo	(	PDM_Type const *	base,
		uint8_t	channel_num
	)

Reports the current number of used words in the output data FIFO.

Parameters

base	The pointer to the PDM-PCM instance address.
channel_num	Channel number

Returns

The current number of used FIFO words (range is 0 - 63).

Function Usage

    uint8_t channel_num = 0U; // Channel number used.
    uint8_t num_in_fifo = Cy_PDM_PCM_Channel_GetNumInFifo(PDM0, channel_num);
 

Cy_PDM_PCM_Channel_ReadFifo()

__STATIC_INLINE uint32_t Cy_PDM_PCM_Channel_ReadFifo	(	PDM_Type const *	base,
		uint8_t	channel_num
	)

Reads ("pops") one word from the output data FIFO.

Parameters

base	The pointer to the PDM-PCM instance address.
channel_num	Channel number

Returns

The data word read from the FIFO is returned.

Function Usage

    uint8_t channel_num = 0U;
    /* Cy_PDM_PCM_Init, Cy_PDM_PCM_Channel_Init and  Cy_PDM_PCM_Channel_Enable are pre-requisites */
    volatile uint32_t int_stat;
    int_stat = Cy_PDM_PCM_Channel_GetInterruptStatusMasked(PDM0, ch);
    if(CY_PDM_PCM_INTR_RX_TRIGGER & int_stat)
    {
        for(i=0; i < RX_FIFO_TRIG_LEVEL; i++)
        {
            int32_t data = (int32_t)Cy_PDM_PCM_Channel_ReadFifo(PDM0, ch);
            // data can be stored and used as pcm data
        }
    }
    Cy_PDM_PCM_Channel_ClearInterrupt(PDM0, channel_num, CY_PDM_PCM_INTR_MASK);

Cy_PDM_PCM_Channel_FreezeFifo()

__STATIC_INLINE void Cy_PDM_PCM_Channel_FreezeFifo	(	PDM_Type *	base,
		uint8_t	channel_num
	)

Freezes the RX FIFO (Debug purpose).

Parameters

base	The pointer to the PDM-PCM instance address.
channel_num	Channel number

Function Usage

    uint8_t channel_num = 0U; // Channel number used.
    Cy_PDM_PCM_Channel_FreezeFifo(PDM0, channel_num);
 

Cy_PDM_PCM_Channel_UnfreezeFifo()

__STATIC_INLINE void Cy_PDM_PCM_Channel_UnfreezeFifo	(	PDM_Type *	base,
		uint8_t	channel_num
	)

Unfreezes the RX FIFO (Debug purpose).

Parameters

base	The pointer to the PDM-PCM instance address.
channel_num	Channel number

Function Usage

    uint8_t channel_num = 0U; // Channel number used.
    Cy_PDM_PCM_Channel_UnfreezeFifo(PDM0, channel_num);
 

Cy_PDM_PCM_Channel_ReadFifoSilent()

__STATIC_INLINE uint32_t Cy_PDM_PCM_Channel_ReadFifoSilent	(	PDM_Type const *	base,
		uint8_t	channel_num
	)

Reads the RX FIFO silent (without touching the FIFO function).

Parameters

base	Pointer to PDM-PCM instance address.
channel_num	Channel number

Returns

Silent FIFO value is read and returned.

Function Usage

    uint8_t channel_num = 0U; // Channel number used.
    Cy_PDM_PCM_Channel_ReadFifoSilent(PDM0, channel_num);
 

Cy_PDM_PCM_DCBlock_Enable()

__STATIC_INLINE void Cy_PDM_PCM_DCBlock_Enable	(	PDM_Type *	base,
		uint8_t	channel_num
	)

Enable DC Block Filter for the given channel.

Parameters

base	The pointer to the PDM-PCM instance address.
channel_num	The channel number.

Cy_PDM_PCM_DCBlock_Disable()

__STATIC_INLINE void Cy_PDM_PCM_DCBlock_Disable	(	PDM_Type *	base,
		uint8_t	channel_num
	)

Disable DC Block Filter for the given channel.

Parameters

base	The pointer to the PDM-PCM instance address.
channel_num	The channel number.

Cy_PDM_PCM_SetFIR0_Scale()

cy_en_pdm_pcm_status_t Cy_PDM_PCM_SetFIR0_Scale	(	PDM_Type *	base,
		uint8_t	channel_num,
		cy_en_pdm_pcm_gain_sel_t	scale
	)

Sets the FIR0 Scale factor for the given channel.

Parameters

base	The pointer to the PDM-PCM instance address.
channel_num	The channel number for gain setting.
scale	scale value defined as cy_en_pdm_pcm_gain_scale_t

Cy_PDM_PCM_ApplyPCM_Gain()

cy_en_pdm_pcm_status_t Cy_PDM_PCM_ApplyPCM_Gain	(	const int32_t *	in_sample,
		int32_t	gain_db,
		cy_en_pdm_pcm_format_t	out_format,
		int32_t *	out_sample
	)

This function applies gain in software to one 24-bit PCM sample data output PCM format can be 24-bit or 16-bit, gain should be in the range of -40db to 40db.

Parameters

in_sample	The pointer to the 24-bit PCM input.
gain_db	The gain to apply. must be within -40db to +40db.
out_format	PCM output format defined as cy_en_pdm_pcm_format_t
out_sample	pointer to output PCM. For 16-bit out format, lower 16-bits holds data.

Cy_PDM_PCM_Channel_GetCurrentState()

__STATIC_INLINE bool Cy_PDM_PCM_Channel_GetCurrentState	(	PDM_Type const *	base,
		uint8_t	channel_num
	)

Returns the current PDM-PCM state (active/stopped).

Parameters

base	The pointer to the PDM-PCM instance address.
channel_num	Channel number

Returns

true if channel is active, false when stopped.

Function Usage

    uint8_t channel_num = 0U; // Channel number used.
    bool channel_state = Cy_PDM_PCM_Channel_GetCurrentState(PDM0, channel_num);