Hardware access layer for managing the Inter-IC Sound (I2S) peripheral. More...

Macros
#define	NRF_I2S_PIN_NOT_CONNECTED 0xFFFFFFFF
	This value can be provided as a parameter for the nrf_i2s_pins_set function call to specify that a given I2S signal (SDOUT, SDIN, or MCK) shall not be connected to a physical pin.

Enumerations
enum	nrf_i2s_task_t { NRF_I2S_TASK_START = offsetof(NRF_I2S_Type, TASKS_START), NRF_I2S_TASK_STOP = offsetof(NRF_I2S_Type, TASKS_STOP) }
	I2S tasks. More...

enum	nrf_i2s_event_t { NRF_I2S_EVENT_RXPTRUPD = offsetof(NRF_I2S_Type, EVENTS_RXPTRUPD), NRF_I2S_EVENT_TXPTRUPD = offsetof(NRF_I2S_Type, EVENTS_TXPTRUPD), NRF_I2S_EVENT_STOPPED = offsetof(NRF_I2S_Type, EVENTS_STOPPED) }
	I2S events. More...

enum	nrf_i2s_int_mask_t { NRF_I2S_INT_RXPTRUPD_MASK = I2S_INTENSET_RXPTRUPD_Msk, NRF_I2S_INT_TXPTRUPD_MASK = I2S_INTENSET_TXPTRUPD_Msk, NRF_I2S_INT_STOPPED_MASK = I2S_INTENSET_STOPPED_Msk }
	I2S interrupts. More...

enum	nrf_i2s_mode_t { NRF_I2S_MODE_MASTER = I2S_CONFIG_MODE_MODE_Master, NRF_I2S_MODE_SLAVE = I2S_CONFIG_MODE_MODE_Slave }
	I2S modes of operation. More...

enum	nrf_i2s_mck_t { NRF_I2S_MCK_DISABLED = 0, NRF_I2S_MCK_32MDIV2 = (int)I2S_CONFIG_MCKFREQ_MCKFREQ_32MDIV2, NRF_I2S_MCK_32MDIV3 = I2S_CONFIG_MCKFREQ_MCKFREQ_32MDIV3, NRF_I2S_MCK_32MDIV4 = I2S_CONFIG_MCKFREQ_MCKFREQ_32MDIV4, NRF_I2S_MCK_32MDIV5 = I2S_CONFIG_MCKFREQ_MCKFREQ_32MDIV5, NRF_I2S_MCK_32MDIV6 = I2S_CONFIG_MCKFREQ_MCKFREQ_32MDIV6, NRF_I2S_MCK_32MDIV8 = I2S_CONFIG_MCKFREQ_MCKFREQ_32MDIV8, NRF_I2S_MCK_32MDIV10 = I2S_CONFIG_MCKFREQ_MCKFREQ_32MDIV10, NRF_I2S_MCK_32MDIV11 = I2S_CONFIG_MCKFREQ_MCKFREQ_32MDIV11, NRF_I2S_MCK_32MDIV15 = I2S_CONFIG_MCKFREQ_MCKFREQ_32MDIV15, NRF_I2S_MCK_32MDIV16 = I2S_CONFIG_MCKFREQ_MCKFREQ_32MDIV16, NRF_I2S_MCK_32MDIV21 = I2S_CONFIG_MCKFREQ_MCKFREQ_32MDIV21, NRF_I2S_MCK_32MDIV23 = I2S_CONFIG_MCKFREQ_MCKFREQ_32MDIV23, NRF_I2S_MCK_32MDIV31 = I2S_CONFIG_MCKFREQ_MCKFREQ_32MDIV31, NRF_I2S_MCK_32MDIV42 = I2S_CONFIG_MCKFREQ_MCKFREQ_32MDIV42, NRF_I2S_MCK_32MDIV63 = I2S_CONFIG_MCKFREQ_MCKFREQ_32MDIV63, NRF_I2S_MCK_32MDIV125 = I2S_CONFIG_MCKFREQ_MCKFREQ_32MDIV125 }
	I2S master clock generator settings. More...

enum	nrf_i2s_ratio_t { NRF_I2S_RATIO_32X = I2S_CONFIG_RATIO_RATIO_32X, NRF_I2S_RATIO_48X = I2S_CONFIG_RATIO_RATIO_48X, NRF_I2S_RATIO_64X = I2S_CONFIG_RATIO_RATIO_64X, NRF_I2S_RATIO_96X = I2S_CONFIG_RATIO_RATIO_96X, NRF_I2S_RATIO_128X = I2S_CONFIG_RATIO_RATIO_128X, NRF_I2S_RATIO_192X = I2S_CONFIG_RATIO_RATIO_192X, NRF_I2S_RATIO_256X = I2S_CONFIG_RATIO_RATIO_256X, NRF_I2S_RATIO_384X = I2S_CONFIG_RATIO_RATIO_384X, NRF_I2S_RATIO_512X = I2S_CONFIG_RATIO_RATIO_512X }
	I2S MCK/LRCK ratios. More...

enum	nrf_i2s_swidth_t { NRF_I2S_SWIDTH_8BIT = I2S_CONFIG_SWIDTH_SWIDTH_8Bit, NRF_I2S_SWIDTH_16BIT = I2S_CONFIG_SWIDTH_SWIDTH_16Bit, NRF_I2S_SWIDTH_24BIT = I2S_CONFIG_SWIDTH_SWIDTH_24Bit }
	I2S sample widths. More...

enum	nrf_i2s_align_t { NRF_I2S_ALIGN_LEFT = I2S_CONFIG_ALIGN_ALIGN_Left, NRF_I2S_ALIGN_RIGHT = I2S_CONFIG_ALIGN_ALIGN_Right }
	I2S alignments of sample within a frame. More...

enum	nrf_i2s_format_t { NRF_I2S_FORMAT_I2S = I2S_CONFIG_FORMAT_FORMAT_I2S, NRF_I2S_FORMAT_ALIGNED = I2S_CONFIG_FORMAT_FORMAT_Aligned }
	I2S frame formats. More...

enum	nrf_i2s_channels_t { NRF_I2S_CHANNELS_STEREO = I2S_CONFIG_CHANNELS_CHANNELS_Stereo, NRF_I2S_CHANNELS_LEFT = I2S_CONFIG_CHANNELS_CHANNELS_Left, NRF_I2S_CHANNELS_RIGHT = I2S_CONFIG_CHANNELS_CHANNELS_Right }
	I2S enabled channels. More...

Functions
__STATIC_INLINE void	nrf_i2s_task_trigger (NRF_I2S_Type *p_i2s, nrf_i2s_task_t task)
	Function for activating a specific I2S task. More...

__STATIC_INLINE uint32_t	nrf_i2s_task_address_get (NRF_I2S_Type const *p_i2s, nrf_i2s_task_t task)
	Function for getting the address of a specific I2S task register. More...

__STATIC_INLINE void	nrf_i2s_event_clear (NRF_I2S_Type *p_i2s, nrf_i2s_event_t event)
	Function for clearing a specific I2S event. More...

__STATIC_INLINE bool	nrf_i2s_event_check (NRF_I2S_Type const *p_i2s, nrf_i2s_event_t event)
	Function for checking the state of a specific I2S event. More...

__STATIC_INLINE uint32_t	nrf_i2s_event_address_get (NRF_I2S_Type const *p_i2s, nrf_i2s_event_t event)
	Function for getting the address of a specific I2S event register. More...

__STATIC_INLINE void	nrf_i2s_int_enable (NRF_I2S_Type *p_i2s, uint32_t mask)
	Function for enabling specified interrupts. More...

__STATIC_INLINE void	nrf_i2s_int_disable (NRF_I2S_Type *p_i2s, uint32_t mask)
	Function for disabling specified interrupts. More...

__STATIC_INLINE bool	nrf_i2s_int_enable_check (NRF_I2S_Type const *p_i2s, nrf_i2s_int_mask_t i2s_int)
	Function for retrieving the state of a given interrupt. More...

__STATIC_INLINE void	nrf_i2s_enable (NRF_I2S_Type *p_i2s)
	Function for enabling the I2S peripheral. More...

__STATIC_INLINE void	nrf_i2s_disable (NRF_I2S_Type *p_i2s)
	Function for disabling the I2S peripheral. More...

__STATIC_INLINE void	nrf_i2s_pins_set (NRF_I2S_Type *p_i2s, uint32_t sck_pin, uint32_t lrck_pin, uint32_t mck_pin, uint32_t sdout_pin, uint32_t sdin_pin)
	Function for configuring I2S pins. More...

__STATIC_INLINE bool	nrf_i2s_configure (NRF_I2S_Type *p_i2s, nrf_i2s_mode_t mode, nrf_i2s_format_t format, nrf_i2s_align_t alignment, nrf_i2s_swidth_t sample_width, nrf_i2s_channels_t channels, nrf_i2s_mck_t mck_setup, nrf_i2s_ratio_t ratio)
	Function for setting the I2S peripheral configuration. More...

__STATIC_INLINE void	nrf_i2s_transfer_set (NRF_I2S_Type p_i2s, uint16_t size, uint32_t p_rx_buffer, uint32_t const *p_tx_buffer)
	Function for setting up the I2S transfer. More...

__STATIC_INLINE void	nrf_i2s_rx_buffer_set (NRF_I2S_Type p_i2s, uint32_t p_buffer)
	Function for setting the pointer to the receive buffer. More...

__STATIC_INLINE uint32_t *	nrf_i2s_rx_buffer_get (NRF_I2S_Type const *p_i2s)
	Function for getting the pointer to the receive buffer. More...

__STATIC_INLINE void	nrf_i2s_tx_buffer_set (NRF_I2S_Type p_i2s, uint32_t const p_buffer)
	Function for setting the pointer to the transmit buffer. More...

__STATIC_INLINE uint32_t *	nrf_i2s_tx_buffer_get (NRF_I2S_Type const *p_i2s)
	Function for getting the pointer to the transmit buffer. More...

Detailed Description

Hardware access layer for managing the Inter-IC Sound (I2S) peripheral.

Enumeration Type Documentation

enum nrf_i2s_align_t

I2S alignments of sample within a frame.

Enumerator
NRF_I2S_ALIGN_LEFT	Left-aligned.
NRF_I2S_ALIGN_RIGHT	Right-aligned.

enum nrf_i2s_channels_t

I2S enabled channels.

Enumerator
NRF_I2S_CHANNELS_STEREO	Stereo.
NRF_I2S_CHANNELS_LEFT	Left only.
NRF_I2S_CHANNELS_RIGHT	Right only.

enum nrf_i2s_event_t

I2S events.

Enumerator
NRF_I2S_EVENT_RXPTRUPD	The RXD.PTR register has been copied to internal double-buffers.
NRF_I2S_EVENT_TXPTRUPD	The TXD.PTR register has been copied to internal double-buffers.
NRF_I2S_EVENT_STOPPED	I2S transfer stopped.

enum nrf_i2s_format_t

I2S frame formats.

Enumerator
NRF_I2S_FORMAT_I2S	Original I2S format.
NRF_I2S_FORMAT_ALIGNED	Alternate (left- or right-aligned) format.

enum nrf_i2s_int_mask_t

I2S interrupts.

Enumerator
NRF_I2S_INT_RXPTRUPD_MASK	Interrupt on RXPTRUPD event.
NRF_I2S_INT_TXPTRUPD_MASK	Interrupt on TXPTRUPD event.
NRF_I2S_INT_STOPPED_MASK	Interrupt on STOPPED event.

enum nrf_i2s_mck_t

I2S master clock generator settings.

Enumerator
NRF_I2S_MCK_DISABLED	MCK disabled.
NRF_I2S_MCK_32MDIV2	32 MHz / 2 = 16.0 MHz.
NRF_I2S_MCK_32MDIV3	32 MHz / 3 = 10.6666667 MHz.
NRF_I2S_MCK_32MDIV4	32 MHz / 4 = 8.0 MHz.
NRF_I2S_MCK_32MDIV5	32 MHz / 5 = 6.4 MHz.
NRF_I2S_MCK_32MDIV6	32 MHz / 6 = 5.3333333 MHz.
NRF_I2S_MCK_32MDIV8	32 MHz / 8 = 4.0 MHz.
NRF_I2S_MCK_32MDIV10	32 MHz / 10 = 3.2 MHz.
NRF_I2S_MCK_32MDIV11	32 MHz / 11 = 2.9090909 MHz.
NRF_I2S_MCK_32MDIV15	32 MHz / 15 = 2.1333333 MHz.
NRF_I2S_MCK_32MDIV16	32 MHz / 16 = 2.0 MHz.
NRF_I2S_MCK_32MDIV21	32 MHz / 21 = 1.5238095 MHz.
NRF_I2S_MCK_32MDIV23	32 MHz / 23 = 1.3913043 MHz.
NRF_I2S_MCK_32MDIV31	32 MHz / 31 = 1.0322581 MHz.
NRF_I2S_MCK_32MDIV42	32 MHz / 42 = 0.7619048 MHz.
NRF_I2S_MCK_32MDIV63	32 MHz / 63 = 0.5079365 MHz.
NRF_I2S_MCK_32MDIV125	32 MHz / 125 = 0.256 MHz.

enum nrf_i2s_mode_t

I2S modes of operation.

Enumerator
NRF_I2S_MODE_MASTER	Master mode.
NRF_I2S_MODE_SLAVE	Slave mode.

enum nrf_i2s_ratio_t

I2S MCK/LRCK ratios.

Enumerator
NRF_I2S_RATIO_32X	LRCK = MCK / 32.
NRF_I2S_RATIO_48X	LRCK = MCK / 48.
NRF_I2S_RATIO_64X	LRCK = MCK / 64.
NRF_I2S_RATIO_96X	LRCK = MCK / 96.
NRF_I2S_RATIO_128X	LRCK = MCK / 128.
NRF_I2S_RATIO_192X	LRCK = MCK / 192.
NRF_I2S_RATIO_256X	LRCK = MCK / 256.
NRF_I2S_RATIO_384X	LRCK = MCK / 384.
NRF_I2S_RATIO_512X	LRCK = MCK / 512.

enum nrf_i2s_swidth_t

I2S sample widths.

Enumerator
NRF_I2S_SWIDTH_8BIT	8 bit.
NRF_I2S_SWIDTH_16BIT	16 bit.
NRF_I2S_SWIDTH_24BIT	24 bit.

enum nrf_i2s_task_t

I2S tasks.

Enumerator
NRF_I2S_TASK_START	Starts continuous I2S transfer. Also starts the MCK generator if this is enabled.
NRF_I2S_TASK_STOP	Stops I2S transfer. Also stops the MCK generator.

Function Documentation

__STATIC_INLINE bool nrf_i2s_configure	(	NRF_I2S_Type *	p_i2s,
		nrf_i2s_mode_t	mode,
		nrf_i2s_format_t	format,
		nrf_i2s_align_t	alignment,
		nrf_i2s_swidth_t	sample_width,
		nrf_i2s_channels_t	channels,
		nrf_i2s_mck_t	mck_setup,
		nrf_i2s_ratio_t	ratio
	)

Function for setting the I2S peripheral configuration.

Parameters

[in]	p_i2s	I2S instance.
[in]	mode	Mode of operation (master or slave).
[in]	format	I2S frame format.
[in]	alignment	Alignment of sample within a frame.
[in]	sample_width	Sample width.
[in]	channels	Enabled channels.
[in]	mck_setup	Master clock generator setup.
[in]	ratio	MCK/LRCK ratio.

Return values

true	If the configuration has been set successfully.
false	If the requested configuration is not allowed.

__STATIC_INLINE void nrf_i2s_disable ( NRF_I2S_Type * p_i2s )

Function for disabling the I2S peripheral.

Parameters

[in] p_i2s I2S instance.

__STATIC_INLINE void nrf_i2s_enable ( NRF_I2S_Type * p_i2s )

Function for enabling the I2S peripheral.

Parameters

[in] p_i2s I2S instance.

__STATIC_INLINE uint32_t nrf_i2s_event_address_get	(	NRF_I2S_Type const *	p_i2s,
		nrf_i2s_event_t	event
	)

Function for getting the address of a specific I2S event register.

Parameters

[in]	p_i2s	I2S instance.
[in]	event	Requested event.

Returns: Address of the specified event register.

__STATIC_INLINE bool nrf_i2s_event_check	(	NRF_I2S_Type const *	p_i2s,
		nrf_i2s_event_t	event
	)

Function for checking the state of a specific I2S event.

Parameters

[in]	p_i2s	I2S instance.
[in]	event	Event to check.

Return values

true	If the event is set.
false	If the event is not set.

__STATIC_INLINE void nrf_i2s_event_clear	(	NRF_I2S_Type *	p_i2s,
		nrf_i2s_event_t	event
	)

Function for clearing a specific I2S event.

Parameters

[in]	p_i2s	I2S instance.
[in]	event	Event to clear.

__STATIC_INLINE void nrf_i2s_int_disable	(	NRF_I2S_Type *	p_i2s,
		uint32_t	mask
	)

Function for disabling specified interrupts.

Parameters

[in]	p_i2s	I2S instance.
[in]	mask	Interrupts to disable.

__STATIC_INLINE void nrf_i2s_int_enable	(	NRF_I2S_Type *	p_i2s,
		uint32_t	mask
	)

Function for enabling specified interrupts.

Parameters

[in]	p_i2s	I2S instance.
[in]	mask	Interrupts to enable.

__STATIC_INLINE bool nrf_i2s_int_enable_check	(	NRF_I2S_Type const *	p_i2s,
		nrf_i2s_int_mask_t	i2s_int
	)

Function for retrieving the state of a given interrupt.

Parameters

[in]	p_i2s	I2S instance.
[in]	i2s_int	Interrupt to check.

Return values

true	If the interrupt is enabled.
false	If the interrupt is not enabled.

__STATIC_INLINE void nrf_i2s_pins_set	(	NRF_I2S_Type *	p_i2s,
		uint32_t	sck_pin,
		uint32_t	lrck_pin,
		uint32_t	mck_pin,
		uint32_t	sdout_pin,
		uint32_t	sdin_pin
	)

Function for configuring I2S pins.

Usage of the SDOUT, SDIN, and MCK signals is optional. If a given signal is not needed, pass the NRF_I2S_PIN_NOT_CONNECTED value instead of its pin number.

Parameters

[in]	p_i2s	I2S instance.
[in]	sck_pin	SCK pin number.
[in]	lrck_pin	LRCK pin number.
[in]	mck_pin	MCK pin number.
[in]	sdout_pin	SDOUT pin number.
[in]	sdin_pin	SDIN pin number.

__STATIC_INLINE uint32_t* nrf_i2s_rx_buffer_get ( NRF_I2S_Type const * p_i2s )

Function for getting the pointer to the receive buffer.

Parameters

[in] p_i2s I2S instance.

Returns: Pointer to the receive buffer.

__STATIC_INLINE void nrf_i2s_rx_buffer_set	(	NRF_I2S_Type *	p_i2s,
		uint32_t *	p_buffer
	)

Function for setting the pointer to the receive buffer.

Note: The size of the buffer can be set only by calling nrf_i2s_transfer_set.

Parameters

[in]	p_i2s	I2S instance.
[in]	p_buffer	Pointer to the receive buffer.

__STATIC_INLINE uint32_t nrf_i2s_task_address_get	(	NRF_I2S_Type const *	p_i2s,
		nrf_i2s_task_t	task
	)

Function for getting the address of a specific I2S task register.

Parameters

[in]	p_i2s	I2S instance.
[in]	task	Requested task.

Returns: Address of the specified task register.

__STATIC_INLINE void nrf_i2s_task_trigger	(	NRF_I2S_Type *	p_i2s,
		nrf_i2s_task_t	task
	)

Function for activating a specific I2S task.

Parameters

[in]	p_i2s	I2S instance.
[in]	task	Task to activate.

__STATIC_INLINE void nrf_i2s_transfer_set	(	NRF_I2S_Type *	p_i2s,
		uint16_t	size,
		uint32_t *	p_rx_buffer,
		uint32_t const *	p_tx_buffer
	)

Function for setting up the I2S transfer.

This function sets up the RX and TX buffers and enables reception and/or transmission accordingly. If the transfer in a given direction is not required, pass NULL instead of the pointer to the corresponding buffer.

Parameters

[in]	p_i2s	I2S instance.
[in]	size	Size of the buffers (in 32-bit words).
[in]	p_rx_buffer	Pointer to the receive buffer. Pass NULL to disable reception.
[in]	p_tx_buffer	Pointer to the transmit buffer. Pass NULL to disable transmission.

__STATIC_INLINE uint32_t* nrf_i2s_tx_buffer_get ( NRF_I2S_Type const * p_i2s )

Function for getting the pointer to the transmit buffer.

Parameters

[in] p_i2s I2S instance.

Returns: Pointer to the transmit buffer.

__STATIC_INLINE void nrf_i2s_tx_buffer_set	(	NRF_I2S_Type *	p_i2s,
		uint32_t const *	p_buffer
	)

Function for setting the pointer to the transmit buffer.

Note: The size of the buffer can be set only by calling nrf_i2s_transfer_set.

Parameters

[in]	p_i2s	I2S instance.
[in]	p_buffer	Pointer to the transmit buffer.

Macros

Enumerations

Functions

Detailed Description

Enumeration Type Documentation

Function Documentation