nRF52 only: Hardware access layer for Two Wire Interface Slave with EasyDMA (TWIS) peripheral. More...

Typedefs
typedef uint8_t	nrf_twis_amount_t
	Variable type to hold amount of data for EasyDMA. More...

typedef uint8_t	nrf_twis_address_t
	Smallest variable type to hold TWI address. More...

Enumerations
enum	nrf_twis_task_t { NRF_TWIS_TASK_STOP = offsetof(NRF_TWIS_Type, TASKS_STOP), NRF_TWIS_TASK_SUSPEND = offsetof(NRF_TWIS_Type, TASKS_SUSPEND), NRF_TWIS_TASK_RESUME = offsetof(NRF_TWIS_Type, TASKS_RESUME), NRF_TWIS_TASK_PREPARERX = offsetof(NRF_TWIS_Type, TASKS_PREPARERX), NRF_TWIS_TASK_PREPARETX = offsetof(NRF_TWIS_Type, TASKS_PREPARETX) }
	TWIS tasks. More...

enum	nrf_twis_event_t { NRF_TWIS_EVENT_STOPPED = offsetof(NRF_TWIS_Type, EVENTS_STOPPED), NRF_TWIS_EVENT_ERROR = offsetof(NRF_TWIS_Type, EVENTS_ERROR), NRF_TWIS_EVENT_RXSTARTED = offsetof(NRF_TWIS_Type, EVENTS_RXSTARTED), NRF_TWIS_EVENT_TXSTARTED = offsetof(NRF_TWIS_Type, EVENTS_TXSTARTED), NRF_TWIS_EVENT_WRITE = offsetof(NRF_TWIS_Type, EVENTS_WRITE), NRF_TWIS_EVENT_READ = offsetof(NRF_TWIS_Type, EVENTS_READ) }
	TWIS events. More...

enum	nrf_twis_short_mask_t { NRF_TWIS_SHORT_WRITE_SUSPEND_MASK = TWIS_SHORTS_WRITE_SUSPEND_Msk, NRF_TWIS_SHORT_READ_SUSPEND_MASK = TWIS_SHORTS_READ_SUSPEND_Msk }
	TWIS shortcuts. More...

enum	nrf_twis_int_mask_t { NRF_TWIS_INT_STOPPED_MASK = TWIS_INTEN_STOPPED_Msk, NRF_TWIS_INT_ERROR_MASK = TWIS_INTEN_ERROR_Msk, NRF_TWIS_INT_RXSTARTED_MASK = TWIS_INTEN_RXSTARTED_Msk, NRF_TWIS_INT_TXSTARTED_MASK = TWIS_INTEN_TXSTARTED_Msk, NRF_TWIS_INT_WRITE_MASK = TWIS_INTEN_WRITE_Msk, NRF_TWIS_INT_READ_MASK = TWIS_INTEN_READ_Msk }
	TWIS interrupts. More...

enum	nrf_twis_error_t { NRF_TWIS_ERROR_OVERFLOW = TWIS_ERRORSRC_OVERFLOW_Msk, NRF_TWIS_ERROR_DATA_NACK = TWIS_ERRORSRC_DNACK_Msk, NRF_TWIS_ERROR_OVERREAD = TWIS_ERRORSRC_OVERREAD_Msk }
	TWIS error source. More...

enum	nrf_twis_config_addr_mask_t { NRF_TWIS_CONFIG_ADDRESS0_MASK = TWIS_CONFIG_ADDRESS0_Msk, NRF_TWIS_CONFIG_ADDRESS1_MASK = TWIS_CONFIG_ADDRESS1_Msk, NRF_TWIS_CONFIG_ADDRESS01_MASK = TWIS_CONFIG_ADDRESS0_Msk \| TWIS_CONFIG_ADDRESS1_Msk }
	TWIS address matching configuration. More...

Functions
__STATIC_INLINE void	nrf_twis_task_trigger (NRF_TWIS_Type *const p_twis, nrf_twis_task_t task)
	Function for activating a specific TWIS task. More...

__STATIC_INLINE uint32_t	nrf_twis_task_address_get (NRF_TWIS_Type const *const p_twis, nrf_twis_task_t task)
	Function for returning the address of a specific TWIS task register. More...

__STATIC_INLINE void	nrf_twis_event_clear (NRF_TWIS_Type *const p_twis, nrf_twis_event_t event)
	Function for clearing a specific event. More...

__STATIC_INLINE bool	nrf_twis_event_check (NRF_TWIS_Type const *const p_twis, nrf_twis_event_t event)
	Function for returning the state of a specific event. More...

__STATIC_INLINE bool	nrf_twis_event_get_and_clear (NRF_TWIS_Type *const p_twis, nrf_twis_event_t event)
	Function for getting and clearing the state of specific event. More...

__STATIC_INLINE uint32_t	nrf_twis_event_address_get (NRF_TWIS_Type const *const p_twis, nrf_twis_event_t event)
	Function for returning the address of a specific TWIS event register. More...

__STATIC_INLINE void	nrf_twis_shorts_enable (NRF_TWIS_Type *const p_twis, uint32_t short_mask)
	Function for setting a shortcut. More...

__STATIC_INLINE void	nrf_twis_shorts_disable (NRF_TWIS_Type *const p_twis, uint32_t short_mask)
	Function for clearing shortcuts. More...

__STATIC_INLINE uint32_t	nrf_twis_shorts_get (NRF_TWIS_Type *const p_twis)
	Get the shorts mask. More...

__STATIC_INLINE void	nrf_twis_int_enable (NRF_TWIS_Type *const p_twis, uint32_t int_mask)
	Function for enabling selected interrupts. More...

__STATIC_INLINE bool	nrf_twis_int_enable_check (NRF_TWIS_Type const *const p_twis, uint32_t int_mask)
	Function for retrieving the state of selected interrupts. More...

__STATIC_INLINE void	nrf_twis_int_disable (NRF_TWIS_Type *const p_twis, uint32_t int_mask)
	Function for disabling selected interrupts. More...

__STATIC_INLINE uint32_t	nrf_twis_error_source_get_and_clear (NRF_TWIS_Type *const p_twis)
	Function for retrieving and clearing the TWIS error source. More...

__STATIC_INLINE uint_fast8_t	nrf_twis_match_get (NRF_TWIS_Type const *p_twis)
	Get information which of addresses matched. More...

__STATIC_INLINE void	nrf_twis_enable (NRF_TWIS_Type *const p_twis)
	Function for enabling TWIS. More...

__STATIC_INLINE void	nrf_twis_disable (NRF_TWIS_Type *const p_twis)
	Function for disabling TWIS. More...

__STATIC_INLINE void	nrf_twis_pins_set (NRF_TWIS_Type *const p_twis, uint32_t scl, uint32_t sda)
	Function for configuring TWIS pins. More...

__STATIC_INLINE void	nrf_twis_rx_buffer_set (NRF_TWIS_Type const p_twis, uint8_t p_buf, nrf_twis_amount_t length)
	Function for setting the receive buffer. More...

__STATIC_INLINE void	nrf_twis_rx_prepare (NRF_TWIS_Type const p_twis, uint8_t p_buf, nrf_twis_amount_t length)
	Function that prepares TWIS for receiving. More...

__STATIC_INLINE nrf_twis_amount_t	nrf_twis_rx_amount_get (NRF_TWIS_Type const *const p_twis)
	Function for getting number of bytes received in the last transaction. More...

__STATIC_INLINE void	nrf_twis_tx_buffer_set (NRF_TWIS_Type const p_twis, uint8_t const p_buf, nrf_twis_amount_t length)
	Function for setting the transmit buffer. More...

__STATIC_INLINE void	nrf_twis_tx_prepare (NRF_TWIS_Type const p_twis, uint8_t const p_buf, nrf_twis_amount_t length)
	Function that prepares TWIS for transmitting. More...

__STATIC_INLINE nrf_twis_amount_t	nrf_twis_tx_amount_get (NRF_TWIS_Type const *const p_twis)
	Function for getting number of bytes transmitted in the last transaction. More...

__STATIC_INLINE void	nrf_twis_address_set (NRF_TWIS_Type *const p_twis, uint_fast8_t n, nrf_twis_address_t addr)
	Function for setting slave address. More...

__STATIC_INLINE nrf_twis_address_t	nrf_twis_address_get (NRF_TWIS_Type const *const p_twis, uint_fast8_t n)
	Function for retrieving configured slave address. More...

__STATIC_INLINE void	nrf_twis_config_address_set (NRF_TWIS_Type *const p_twis, nrf_twis_config_addr_mask_t addr_mask)
	Function for setting the device address configuration. More...

__STATIC_INLINE nrf_twis_config_addr_mask_t	nrf_twis_config_address_get (NRF_TWIS_Type const *const p_twis)
	Function for retrieving the device address configuration. More...

__STATIC_INLINE void	nrf_twis_orc_set (NRF_TWIS_Type *const p_twis, uint8_t orc)
	Function for setting the over-read character. More...

__STATIC_INLINE uint8_t	nrf_twis_orc_get (NRF_TWIS_Type const *const p_twis)
	Function for setting the over-read character. More...

Detailed Description

nRF52 only: Hardware access layer for Two Wire Interface Slave with EasyDMA (TWIS) peripheral.

Typedef Documentation

typedef uint8_t nrf_twis_address_t

Smallest variable type to hold TWI address.

Variable of the minimum size that can hold single TWI address.

Note: Defined to make it simple to change if new TWI would support for example 10 bit addressing mode.

typedef uint8_t nrf_twis_amount_t

Variable type to hold amount of data for EasyDMA.

Variable of the minimum size that can hold the amount of data to transfer.

Note: Defined to make it simple to change if EasyDMA would be updated to support more data in the future devices to.

Enumeration Type Documentation

enum nrf_twis_config_addr_mask_t

TWIS address matching configuration.

Enumerator
NRF_TWIS_CONFIG_ADDRESS0_MASK	Enable or disable address matching on ADDRESS[0]
NRF_TWIS_CONFIG_ADDRESS1_MASK	Enable or disable address matching on ADDRESS[1]
NRF_TWIS_CONFIG_ADDRESS01_MASK	Enable both address matching

enum nrf_twis_error_t

TWIS error source.

Enumerator
NRF_TWIS_ERROR_OVERFLOW	RX buffer overflow detected, and prevented
NRF_TWIS_ERROR_DATA_NACK	NACK sent after receiving a data byte
NRF_TWIS_ERROR_OVERREAD	TX buffer over-read detected, and prevented

enum nrf_twis_event_t

TWIS events.

Enumerator
NRF_TWIS_EVENT_STOPPED	TWIS stopped
NRF_TWIS_EVENT_ERROR	TWIS error
NRF_TWIS_EVENT_RXSTARTED	Receive sequence started
NRF_TWIS_EVENT_TXSTARTED	Transmit sequence started
NRF_TWIS_EVENT_WRITE	Write command received
NRF_TWIS_EVENT_READ	Read command received

enum nrf_twis_int_mask_t

TWIS interrupts.

Enumerator
NRF_TWIS_INT_STOPPED_MASK	Interrupt on STOPPED event
NRF_TWIS_INT_ERROR_MASK	Interrupt on ERROR event
NRF_TWIS_INT_RXSTARTED_MASK	Interrupt on RXSTARTED event
NRF_TWIS_INT_TXSTARTED_MASK	Interrupt on TXSTARTED event
NRF_TWIS_INT_WRITE_MASK	Interrupt on WRITE event
NRF_TWIS_INT_READ_MASK	Interrupt on READ event

enum nrf_twis_short_mask_t

TWIS shortcuts.

Enumerator
NRF_TWIS_SHORT_WRITE_SUSPEND_MASK	Shortcut between WRITE event and SUSPEND task
NRF_TWIS_SHORT_READ_SUSPEND_MASK	Shortcut between READ event and SUSPEND task

enum nrf_twis_task_t

TWIS tasks.

Enumerator
NRF_TWIS_TASK_STOP	Stop TWIS transaction
NRF_TWIS_TASK_SUSPEND	Suspend TWIS transaction
NRF_TWIS_TASK_RESUME	Resume TWIS transaction
NRF_TWIS_TASK_PREPARERX	Prepare the TWIS slave to respond to a write command
NRF_TWIS_TASK_PREPARETX	Prepare the TWIS slave to respond to a read command

Function Documentation

__STATIC_INLINE nrf_twis_address_t nrf_twis_address_get	(	NRF_TWIS_Type const *const	p_twis,
		uint_fast8_t	n
	)

Function for retrieving configured slave address.

Function gets the selected address for this TWI interface.

Parameters

[in]	p_twis	TWIS instance.
	n	Index of address to get

__STATIC_INLINE void nrf_twis_address_set	(	NRF_TWIS_Type *const	p_twis,
		uint_fast8_t	n,
		nrf_twis_address_t	addr
	)

Function for setting slave address.

Function sets the selected address for this TWI interface.

Parameters

[in]	p_twis	TWIS instance.
	n	Index of address to set
	addr	Addres to set

See Also: nrf_twis_config_address_set; nrf_twis_config_address_get

__STATIC_INLINE nrf_twis_config_addr_mask_t nrf_twis_config_address_get ( NRF_TWIS_Type const *const p_twis )

Function for retrieving the device address configuration.

Parameters

[in] p_twis TWIS instance.

Returns: Mask of address indexes of what device should answer to.

__STATIC_INLINE void nrf_twis_config_address_set	(	NRF_TWIS_Type *const	p_twis,
		nrf_twis_config_addr_mask_t	addr_mask
	)

Function for setting the device address configuration.

Parameters

[in]	p_twis	TWIS instance.
	addr_mask	Mask of address indexes of what device should answer to.

See Also: nrf_twis_address_set

__STATIC_INLINE void nrf_twis_disable ( NRF_TWIS_Type *const p_twis )

Function for disabling TWIS.

Parameters

[in] p_twis TWIS instance.

__STATIC_INLINE void nrf_twis_enable ( NRF_TWIS_Type *const p_twis )

Function for enabling TWIS.

Parameters

[in] p_twis TWIS instance.

__STATIC_INLINE uint32_t nrf_twis_error_source_get_and_clear ( NRF_TWIS_Type *const p_twis )

Function for retrieving and clearing the TWIS error source.

Attention: Error sources are cleared after read.

Parameters

[in] p_twis TWIS instance

Returns: Error source mask with values from nrf_twis_error_t.

__STATIC_INLINE uint32_t nrf_twis_event_address_get	(	NRF_TWIS_Type const *const	p_twis,
		nrf_twis_event_t	event
	)

Function for returning the address of a specific TWIS event register.

Parameters

[in]	p_twis	TWIS instance.
	event	Event.

Returns: Address.

__STATIC_INLINE bool nrf_twis_event_check	(	NRF_TWIS_Type const *const	p_twis,
		nrf_twis_event_t	event
	)

Function for returning the state of a specific event.

Parameters

[in]	p_twis	TWIS instance.
	event	Event.

Return values

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

__STATIC_INLINE void nrf_twis_event_clear	(	NRF_TWIS_Type *const	p_twis,
		nrf_twis_event_t	event
	)

Function for clearing a specific event.

Parameters

[in]	p_twis	TWIS instance.
	event	Event.

__STATIC_INLINE bool nrf_twis_event_get_and_clear	(	NRF_TWIS_Type *const	p_twis,
		nrf_twis_event_t	event
	)

Function for getting and clearing the state of specific event.

This function checks the state of the event and clears it.

Parameters

[in,out]	p_twis	TWIS instance
	event	Event.

Return values

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

__STATIC_INLINE void nrf_twis_int_disable	(	NRF_TWIS_Type *const	p_twis,
		uint32_t	int_mask
	)

Function for disabling selected interrupts.

Parameters

[in]	p_twis	TWIS instance.
	int_mask	Interrupts mask.

__STATIC_INLINE void nrf_twis_int_enable	(	NRF_TWIS_Type *const	p_twis,
		uint32_t	int_mask
	)

Function for enabling selected interrupts.

Parameters

[in]	p_twis	TWIS instance.
	int_mask	Interrupts mask.

__STATIC_INLINE bool nrf_twis_int_enable_check	(	NRF_TWIS_Type const *const	p_twis,
		uint32_t	int_mask
	)

Function for retrieving the state of selected interrupts.

Parameters

[in]	p_twis	TWIS instance.
	int_mask	Interrupts mask.

Return values

true	If any of selected interrupts is enabled.
false	If none of selected interrupts is enabled.

__STATIC_INLINE uint_fast8_t nrf_twis_match_get ( NRF_TWIS_Type const * p_twis )

Get information which of addresses matched.

Function returns index in the address table that points to the address that already matched.

Parameters

[in] p_twis TWIS instance

Returns: Index of matched address

__STATIC_INLINE uint8_t nrf_twis_orc_get ( NRF_TWIS_Type const *const p_twis )

Function for setting the over-read character.

Parameters

[in] p_twis TWIS instance.

Returns: Over-read character configured for selected instance.

__STATIC_INLINE void nrf_twis_orc_set	(	NRF_TWIS_Type *const	p_twis,
		uint8_t	orc
	)

Function for setting the over-read character.

Parameters

[in]	p_twis	TWIS instance.
[in]	orc	Over-read character. Character clocked out in case of over-read of the TXD buffer.

__STATIC_INLINE void nrf_twis_pins_set	(	NRF_TWIS_Type *const	p_twis,
		uint32_t	scl,
		uint32_t	sda
	)

Function for configuring TWIS pins.

Parameters

[in]	p_twis	TWIS instance.
	scl	SCL pin number.
	sda	SDA pin number.

__STATIC_INLINE nrf_twis_amount_t nrf_twis_rx_amount_get ( NRF_TWIS_Type const *const p_twis )

Function for getting number of bytes received in the last transaction.

Parameters

[in] p_twis TWIS instance.

Returns: Amount of bytes received.

__STATIC_INLINE void nrf_twis_rx_buffer_set	(	NRF_TWIS_Type *const	p_twis,
		uint8_t *	p_buf,
		nrf_twis_amount_t	length
	)

Function for setting the receive buffer.

Parameters

[in]	p_twis	TWIS instance.
	p_buf	Pointer to the buffer for received data.
	length	Maximum number of data bytes to receive.

__STATIC_INLINE void nrf_twis_rx_prepare	(	NRF_TWIS_Type *const	p_twis,
		uint8_t *	p_buf,
		nrf_twis_amount_t	length
	)

Function that prepares TWIS for receiving.

This function sets receive buffer and then sets NRF_TWIS_TASK_PREPARERX task.

Parameters

[in]	p_twis	TWIS instance.
	p_buf	Pointer to the buffer for received data.
	length	Maximum number of data bytes to receive.

__STATIC_INLINE void nrf_twis_shorts_disable	(	NRF_TWIS_Type *const	p_twis,
		uint32_t	short_mask
	)

Function for clearing shortcuts.

Parameters

[in]	p_twis	TWIS instance.
	short_mask	Shortcuts mask.

__STATIC_INLINE void nrf_twis_shorts_enable	(	NRF_TWIS_Type *const	p_twis,
		uint32_t	short_mask
	)

Function for setting a shortcut.

Parameters

[in]	p_twis	TWIS instance.
	short_mask	Shortcuts mask.

__STATIC_INLINE uint32_t nrf_twis_shorts_get ( NRF_TWIS_Type *const p_twis )

Get the shorts mask.

Function returns shorts register.

Parameters

[in] p_twis TWIS instance.

Returns: Flags of currently enabled shortcuts

__STATIC_INLINE uint32_t nrf_twis_task_address_get	(	NRF_TWIS_Type const *const	p_twis,
		nrf_twis_task_t	task
	)

Function for returning the address of a specific TWIS task register.

Parameters

[in]	p_twis	TWIS instance.
	task	Task.

Returns: Task address.

__STATIC_INLINE void nrf_twis_task_trigger	(	NRF_TWIS_Type *const	p_twis,
		nrf_twis_task_t	task
	)

Function for activating a specific TWIS task.

Parameters

[in]	p_twis	TWIS instance.
	task	Task.

__STATIC_INLINE nrf_twis_amount_t nrf_twis_tx_amount_get ( NRF_TWIS_Type const *const p_twis )

Function for getting number of bytes transmitted in the last transaction.

Parameters

[in] p_twis TWIS instance.

Returns: Amount of bytes transmitted.

__STATIC_INLINE void nrf_twis_tx_buffer_set	(	NRF_TWIS_Type *const	p_twis,
		uint8_t const *	p_buf,
		nrf_twis_amount_t	length
	)

Function for setting the transmit buffer.

Parameters

[in]	p_twis	TWIS instance.
	p_buf	Pointer to the buffer with data to send.
	length	Maximum number of data bytes to transmit.

__STATIC_INLINE void nrf_twis_tx_prepare	(	NRF_TWIS_Type *const	p_twis,
		uint8_t const *	p_buf,
		nrf_twis_amount_t	length
	)

Function that prepares TWIS for transmitting.

This function sets transmit buffer and then sets NRF_TWIS_TASK_PREPARETX task.

Parameters

[in]	p_twis	TWIS instance.
	p_buf	Pointer to the buffer with data to send.
	length	Maximum number of data bytes to transmit.

Typedefs

Enumerations

Functions

Detailed Description

Typedef Documentation

Enumeration Type Documentation

Function Documentation