nRF52 only: Hardware abstraction layer for accessing the pulse density modulation (PDM) peripheral. More...

Macros
#define	NRF_PDM_GAIN_MINIMUM 0x00

#define	NRF_PDM_GAIN_DEFAULT 0x28

#define	NRF_PDM_GAIN_MAXIMUM 0x50

Typedefs
typedef uint8_t	nrf_pdm_gain_t

Enumerations
enum	nrf_pdm_task_t { NRF_PDM_TASK_START = offsetof(NRF_PDM_Type, TASKS_START), NRF_PDM_TASK_STOP = offsetof(NRF_PDM_Type, TASKS_STOP) }
	PDM tasks. More...

enum	nrf_pdm_event_t { NRF_PDM_EVENT_STARTED = offsetof(NRF_PDM_Type, EVENTS_STARTED), NRF_PDM_EVENT_STOPPED = offsetof(NRF_PDM_Type, EVENTS_STOPPED), NRF_PDM_EVENT_END = offsetof(NRF_PDM_Type, EVENTS_END) }
	PDM events. More...

enum	nrf_pdm_int_mask_t { NRF_PDM_INT_STARTED = PDM_INTENSET_STARTED_Msk, NRF_PDM_INT_STOPPED = PDM_INTENSET_STOPPED_Msk, NRF_PDM_INT_END = PDM_INTENSET_END_Msk }
	PDM interrupt masks. More...

enum	nrf_pdm_freq_t { NRF_PDM_FREQ_1000K = PDM_PDMCLKCTRL_FREQ_1000K, NRF_PDM_FREQ_1032K = PDM_PDMCLKCTRL_FREQ_Default, NRF_PDM_FREQ_1067K = PDM_PDMCLKCTRL_FREQ_1067K }
	PDM clock frequency. More...

enum	nrf_pdm_mode_t { NRF_PDM_MODE_STEREO = PDM_MODE_OPERATION_Stereo, NRF_PDM_MODE_MONO = PDM_MODE_OPERATION_Mono }
	PDM operation mode. More...

enum	nrf_pdm_edge_t { NRF_PDM_EDGE_LEFTFALLING = PDM_MODE_EDGE_LeftFalling, NRF_PDM_EDGE_LEFTRISING = PDM_MODE_EDGE_LeftRising }
	PDM sampling mode. More...

Functions
__STATIC_INLINE void	nrf_pdm_task_trigger (nrf_pdm_task_t pdm_task)
	Function for triggering a PDM task. More...

__STATIC_INLINE uint32_t	nrf_pdm_task_address_get (nrf_pdm_task_t pdm_task)
	Function for getting the address of a PDM task register. More...

__STATIC_INLINE bool	nrf_pdm_event_check (nrf_pdm_event_t pdm_event)
	Function for getting the state of a PDM event. More...

__STATIC_INLINE void	nrf_pdm_event_clear (nrf_pdm_event_t pdm_event)
	Function for clearing a PDM event. More...

__STATIC_INLINE volatile uint32_t *	nrf_pdm_event_address_get (nrf_pdm_event_t pdm_event)
	Function for getting the address of a PDM event register. More...

__STATIC_INLINE void	nrf_pdm_int_enable (uint32_t pdm_int_mask)
	Function for enabling PDM interrupts. More...

__STATIC_INLINE bool	nrf_pdm_int_enable_check (uint32_t pdm_int_mask)
	Function for retrieving the state of PDM interrupts. More...

__STATIC_INLINE void	nrf_pdm_int_disable (uint32_t pdm_int_mask)
	Function for disabling interrupts. More...

__STATIC_INLINE void	nrf_pdm_enable (void)
	Function for enabling the PDM peripheral. More...

__STATIC_INLINE void	nrf_pdm_disable (void)
	Function for disabling the PDM peripheral.

__STATIC_INLINE bool	nrf_pdm_enable_check (void)
	Function for checking if the PDM peripheral is enabled. More...

__STATIC_INLINE void	nrf_pdm_mode_set (nrf_pdm_mode_t pdm_mode, nrf_pdm_edge_t pdm_edge)
	Function for setting the PDM operation mode. More...

__STATIC_INLINE void	nrf_pdm_mode_get (nrf_pdm_mode_t p_pdm_mode, nrf_pdm_edge_t p_pdm_edge)
	Function for getting the PDM operation mode. More...

__STATIC_INLINE void	nrf_pdm_clock_set (nrf_pdm_freq_t pdm_freq)
	Function for setting the PDM clock frequency. More...

__STATIC_INLINE nrf_pdm_freq_t	nrf_pdm_clock_get (void)
	Function for getting the PDM clock frequency.

__STATIC_INLINE void	nrf_pdm_psel_connect (uint32_t psel_clk, uint32_t psel_din)
	Function for setting up the PDM pins. More...

__STATIC_INLINE void	nrf_pdm_psel_disconnect ()
	Function for disconnecting the PDM pins.

__STATIC_INLINE void	nrf_pdm_gain_set (nrf_pdm_gain_t gain_l, nrf_pdm_gain_t gain_r)
	Function for setting the PDM gain. More...

__STATIC_INLINE void	nrf_pdm_gain_get (nrf_pdm_gain_t p_gain_l, nrf_pdm_gain_t p_gain_r)
	Function for getting the PDM gain. More...

__STATIC_INLINE void	nrf_pdm_buffer_set (uint32_t *p_buffer, uint32_t num)
	Function for setting the PDM sample buffer. More...

__STATIC_INLINE uint32_t *	nrf_pdm_buffer_get ()
	Function for getting the current PDM sample buffer address. More...

Detailed Description

nRF52 only: Hardware abstraction layer for accessing the pulse density modulation (PDM) peripheral.

Enumeration Type Documentation

enum nrf_pdm_edge_t

PDM sampling mode.

Enumerator
NRF_PDM_EDGE_LEFTFALLING	Left (or mono) is sampled on falling edge of PDM_CLK.
NRF_PDM_EDGE_LEFTRISING	Left (or mono) is sampled on rising edge of PDM_CLK.

enum nrf_pdm_event_t

PDM events.

Enumerator
NRF_PDM_EVENT_STARTED	PDM transfer has started.
NRF_PDM_EVENT_STOPPED	PDM transfer has finished.
NRF_PDM_EVENT_END	The PDM has written the last sample specified by SAMPLE.MAXCNT (or the last sample after a STOP task has been received) to Data RAM.

enum nrf_pdm_freq_t

PDM clock frequency.

Enumerator
NRF_PDM_FREQ_1000K	PDM_CLK = 1.000 MHz.
NRF_PDM_FREQ_1032K	PDM_CLK = 1.032 MHz.
NRF_PDM_FREQ_1067K	PDM_CLK = 1.067 MHz.

enum nrf_pdm_int_mask_t

PDM interrupt masks.

Enumerator
NRF_PDM_INT_STARTED	Interrupt on EVENTS_STARTED event.
NRF_PDM_INT_STOPPED	Interrupt on EVENTS_STOPPED event.
NRF_PDM_INT_END	Interrupt on EVENTS_END event.

enum nrf_pdm_mode_t

PDM operation mode.

Enumerator
NRF_PDM_MODE_STEREO	Sample and store one pair (Left + Right) of 16-bit samples per RAM word.
NRF_PDM_MODE_MONO	Sample and store two successive Left samples (16 bit each) per RAM word.

enum nrf_pdm_task_t

PDM tasks.

Enumerator
NRF_PDM_TASK_START	Starts continuous PDM transfer.
NRF_PDM_TASK_STOP	Stops PDM transfer.

Function Documentation

__STATIC_INLINE uint32_t* nrf_pdm_buffer_get ( )

Function for getting the current PDM sample buffer address.

Returns: Pointer to the current sample buffer.

__STATIC_INLINE void nrf_pdm_buffer_set	(	uint32_t *	p_buffer,
		uint32_t	num
	)

Function for setting the PDM sample buffer.

Parameters

[in]	p_buffer	Pointer to the RAM address where samples should be written with EasyDMA.
[in]	num	Number of samples to allocate memory for in EasyDMA mode.

The amount of allocated RAM depends on the operation mode.

For stereo mode: N 32-bit words.
For mono mode: Ceil(N/2) 32-bit words.

__STATIC_INLINE void nrf_pdm_clock_set ( nrf_pdm_freq_t pdm_freq )

Function for setting the PDM clock frequency.

Parameters

[in] pdm_freq PDM clock frequency.

__STATIC_INLINE void nrf_pdm_enable ( void )

Function for enabling the PDM peripheral.

The PDM peripheral must be enabled before use.

__STATIC_INLINE bool nrf_pdm_enable_check ( void )

Function for checking if the PDM peripheral is enabled.

Return values

true	If the PDM peripheral is enabled.
false	If the PDM peripheral is not enabled.

__STATIC_INLINE volatile uint32_t* nrf_pdm_event_address_get ( nrf_pdm_event_t pdm_event )

Function for getting the address of a PDM event register.

Parameters

[in] pdm_event PDM event.

Returns: Address of the specified PDM event.

__STATIC_INLINE bool nrf_pdm_event_check ( nrf_pdm_event_t pdm_event )

Function for getting the state of a PDM event.

Parameters

[in] pdm_event PDM event.

Returns: State of the specified PDM event.

__STATIC_INLINE void nrf_pdm_event_clear ( nrf_pdm_event_t pdm_event )

Function for clearing a PDM event.

Parameters

[in] pdm_event PDM event.

__STATIC_INLINE void nrf_pdm_gain_get	(	nrf_pdm_gain_t *	p_gain_l,
		nrf_pdm_gain_t *	p_gain_r
	)

Function for getting the PDM gain.

Parameters

[out]	p_gain_l	Left channel gain.
[out]	p_gain_r	Right channel gain.

__STATIC_INLINE void nrf_pdm_gain_set	(	nrf_pdm_gain_t	gain_l,
		nrf_pdm_gain_t	gain_r
	)

Function for setting the PDM gain.

Parameters

[in]	gain_l	Left channel gain.
[in]	gain_r	Right channel gain.

__STATIC_INLINE void nrf_pdm_int_disable ( uint32_t pdm_int_mask )

Function for disabling interrupts.

Parameters

pdm_int_mask Interrupts to disable.

__STATIC_INLINE void nrf_pdm_int_enable ( uint32_t pdm_int_mask )

Function for enabling PDM interrupts.

Parameters

[in] pdm_int_mask Interrupts to enable.

__STATIC_INLINE bool nrf_pdm_int_enable_check ( uint32_t pdm_int_mask )

Function for retrieving the state of PDM interrupts.

Parameters

[in] pdm_int_mask Interrupts to check.

Return values

true	If all specified interrupts are enabled.
false	If at least one of the given interrupts is not enabled.

__STATIC_INLINE void nrf_pdm_mode_get	(	nrf_pdm_mode_t *	p_pdm_mode,
		nrf_pdm_edge_t *	p_pdm_edge
	)

Function for getting the PDM operation mode.

Parameters

[out]	p_pdm_mode	PDM operation mode.
[out]	p_pdm_edge	PDM sampling mode.

__STATIC_INLINE void nrf_pdm_mode_set	(	nrf_pdm_mode_t	pdm_mode,
		nrf_pdm_edge_t	pdm_edge
	)

Function for setting the PDM operation mode.

Parameters

[in]	pdm_mode	PDM operation mode.
[in]	pdm_edge	PDM sampling mode.

__STATIC_INLINE void nrf_pdm_psel_connect	(	uint32_t	psel_clk,
		uint32_t	psel_din
	)

Function for setting up the PDM pins.

Parameters

[in]	psel_clk	CLK pin number.
[in]	psel_din	DIN pin number.

__STATIC_INLINE uint32_t nrf_pdm_task_address_get ( nrf_pdm_task_t pdm_task )

Function for getting the address of a PDM task register.

Parameters

[in] pdm_task PDM task.

Returns: Address of the specified PDM task.

__STATIC_INLINE void nrf_pdm_task_trigger ( nrf_pdm_task_t pdm_task )

Function for triggering a PDM task.

Parameters

[in] pdm_task PDM task.

Macros

Typedefs

Enumerations

Functions

Detailed Description

Enumeration Type Documentation

Function Documentation