Serial Peripheral Interface Master with EasyDMA (SPIM) driver. More...

Modules
	SPIM peripheral driver configuration

Data Structures
struct	nrfx_spim_t
	Data structure of the Serial Peripheral Interface Master with EasyDMA (SPIM) driver instance. More...

struct	nrfx_spim_config_t
	Configuration structure of the SPIM driver instance. More...

struct	nrfx_spim_xfer_desc_t
	Single transfer descriptor structure. More...

struct	nrfx_spim_evt_t
	SPIM event description with transmission details. More...

Macros
#define	NRFX_SPIM_INSTANCE(id)
	Macro for creating an instance of the SPIM driver. More...

#define	NRFX_SPIM_PIN_NOT_USED 0xFF
	This value can be provided instead of a pin number for signals MOSI, MISO, and Slave Select to specify that the given signal is not used and therefore does not need to be connected to a pin.

#define	NRFX_SPIM_DEFAULT_EXTENDED_CONFIG
	Extended default configuration of the SPIM instance. More...

#define	NRFX_SPIM_DEFAULT_CONFIG
	The default configuration of the SPIM master instance. More...

#define	NRFX_SPIM_FLAG_TX_POSTINC (1UL << 0)
	Flag indicating that TX buffer address will be incremented after transfer.

#define	NRFX_SPIM_FLAG_RX_POSTINC (1UL << 1)
	Flag indicating that RX buffer address will be incremented after transfer.

#define	NRFX_SPIM_FLAG_NO_XFER_EVT_HANDLER (1UL << 2)
	Flag indicating that the interrupt after each transfer will be suppressed, and the event handler will not be called.

#define	NRFX_SPIM_FLAG_HOLD_XFER (1UL << 3)
	Flag indicating that the transfer will be set up, but not started.

#define	NRFX_SPIM_FLAG_REPEATED_XFER (1UL << 4)
	Flag indicating that the transfer will be executed multiple times.

#define	NRFX_SPIM_SINGLE_XFER(p_tx, tx_len, p_rx, rx_len)
	Macro for setting up single transfer descriptor. More...

#define	NRFX_SPIM_XFER_TRX(p_tx_buf, tx_length, p_rx_buf, rx_length) NRFX_SPIM_SINGLE_XFER(p_tx_buf, tx_length, p_rx_buf, rx_length)
	Macro for setting the duplex TX RX transfer.

#define	NRFX_SPIM_XFER_TX(p_buf, length) NRFX_SPIM_SINGLE_XFER(p_buf, length, NULL, 0)
	Macro for setting the TX transfer.

#define	NRFX_SPIM_XFER_RX(p_buf, length) NRFX_SPIM_SINGLE_XFER(NULL, 0, p_buf, length)
	Macro for setting the RX transfer.

Typedefs
typedef void(*	nrfx_spim_evt_handler_t )(nrfx_spim_evt_t const p_event, void p_context)
	SPIM driver event handler type.

Enumerations
enum	nrfx_spim_evt_type_t { NRFX_SPIM_EVENT_DONE }
	SPIM master driver event types, passed to the handler routine provided during initialization. More...

Functions
nrfx_err_t	nrfx_spim_init (nrfx_spim_t const const p_instance, nrfx_spim_config_t const p_config, nrfx_spim_evt_handler_t handler, void *p_context)
	Function for initializing the SPIM driver instance. More...

void	nrfx_spim_uninit (nrfx_spim_t const *const p_instance)
	Function for uninitializing the SPIM driver instance. More...

nrfx_err_t	nrfx_spim_xfer (nrfx_spim_t const const p_instance, nrfx_spim_xfer_desc_t const p_xfer_desc, uint32_t flags)
	Function for starting the SPIM data transfer. More...

nrfx_err_t	nrfx_spim_xfer_dcx (nrfx_spim_t const const p_instance, nrfx_spim_xfer_desc_t const p_xfer_desc, uint32_t flags, uint8_t cmd_length)
	Function for starting the SPIM data transfer with DCX control. More...

uint32_t	nrfx_spim_start_task_get (nrfx_spim_t const *p_instance)
	Function for returning the address of a SPIM start task. More...

uint32_t	nrfx_spim_end_event_get (nrfx_spim_t const *p_instance)
	Function for returning the address of a END SPIM event. More...

void	nrfx_spim_abort (nrfx_spim_t const *p_instance)
	Function for aborting ongoing transfer. More...

Detailed Description

Serial Peripheral Interface Master with EasyDMA (SPIM) driver.

Macro Definition Documentation

#define NRFX_SPIM_DEFAULT_CONFIG

Value:

{ \
 .sck_pin = NRFX_SPIM_PIN_NOT_USED, \
 .mosi_pin = NRFX_SPIM_PIN_NOT_USED, \
 .miso_pin = NRFX_SPIM_PIN_NOT_USED, \
 .ss_pin = NRFX_SPIM_PIN_NOT_USED, \
 .ss_active_high = false, \
 .irq_priority = NRFX_SPIM_DEFAULT_CONFIG_IRQ_PRIORITY, \
 .orc = 0xFF, \
 .frequency = NRF_SPIM_FREQ_4M, \
 .mode = NRF_SPIM_MODE_0, \
 .bit_order = NRF_SPIM_BIT_ORDER_MSB_FIRST, \
 NRFX_SPIM_DEFAULT_EXTENDED_CONFIG \
}

The default configuration of the SPIM master instance.

#define NRFX_SPIM_DEFAULT_EXTENDED_CONFIG

Value:

.dcx_pin = NRFX_SPIM_PIN_NOT_USED, \
 .rx_delay = 0x02, \
 .use_hw_ss = false, \
 .ss_duration = 0x02,

Extended default configuration of the SPIM instance.

#define NRFX_SPIM_INSTANCE ( id )

Value:

{ \
 .p_reg = NRFX_CONCAT_2(NRF_SPIM, id), \
 .drv_inst_idx = NRFX_CONCAT_3(NRFX_SPIM, id, _INST_IDX), \
}

Macro for creating an instance of the SPIM driver.

#define NRFX_SPIM_SINGLE_XFER	(	p_tx,
		tx_len,
		p_rx,
		rx_len
	)

Value:

{ \
 .p_tx_buffer = (uint8_t const *)(p_tx), \
 .tx_length = (tx_len), \
 .p_rx_buffer = (p_rx), \
 .rx_length = (rx_len), \
 }

Macro for setting up single transfer descriptor.

This macro is for internal use only.

Enumeration Type Documentation

enum nrfx_spim_evt_type_t

SPIM master driver event types, passed to the handler routine provided during initialization.

Enumerator
NRFX_SPIM_EVENT_DONE	Transfer done.

Function Documentation

void nrfx_spim_abort ( nrfx_spim_t const * p_instance )

Function for aborting ongoing transfer.

Parameters

[in] p_instance Pointer to the driver instance structure.

uint32_t nrfx_spim_end_event_get ( nrfx_spim_t const * p_instance )

Function for returning the address of a END SPIM event.

The END event can be used to detect the end of a transfer if the NRFX_SPIM_FLAG_NO_XFER_EVT_HANDLER option is used.

Parameters

[in] p_instance Pointer to the driver instance structure.

Returns: END event address.

nrfx_err_t nrfx_spim_init	(	nrfx_spim_t const *const	p_instance,
		nrfx_spim_config_t const *	p_config,
		nrfx_spim_evt_handler_t	handler,
		void *	p_context
	)

Function for initializing the SPIM driver instance.

This function configures and enables the specified peripheral.

Parameters

[in]	p_instance	Pointer to the driver instance structure.
[in]	p_config	Pointer to the structure with the initial configuration.
[in]	handler	Event handler provided by the user. If NULL, transfers will be performed in blocking mode.
[in]	p_context	Context passed to event handler.

Return values

NRFX_SUCCESS	Initialization was successful.
NRFX_ERROR_INVALID_STATE	The driver was already initialized.
NRFX_ERROR_BUSY	Some other peripheral with the same instance ID is already in use. This is possible only if Peripheral Resource Sharing (PRS) module is enabled.
NRFX_ERROR_NOT_SUPPORTED	Requested configuration is not supported by the SPIM instance.

uint32_t nrfx_spim_start_task_get ( nrfx_spim_t const * p_instance )

Function for returning the address of a SPIM start task.

This function is to be used if nrfx_spim_xfer was called with the flag NRFX_SPIM_FLAG_HOLD_XFER. In that case, the transfer is not started by the driver, but it must be started externally by PPI.

Parameters

[in] p_instance Pointer to the driver instance structure.

Returns: Start task address.

void nrfx_spim_uninit ( nrfx_spim_t const *const p_instance )

Function for uninitializing the SPIM driver instance.

Parameters

[in] p_instance Pointer to the driver instance structure.

nrfx_err_t nrfx_spim_xfer	(	nrfx_spim_t const *const	p_instance,
		nrfx_spim_xfer_desc_t const *	p_xfer_desc,
		uint32_t	flags
	)

Function for starting the SPIM data transfer.

Additional options are provided using the flags parameter:

NRFX_SPIM_FLAG_TX_POSTINC and NRFX_SPIM_FLAG_RX_POSTINC - Post-incrementation of buffer addresses.
NRFX_SPIM_FLAG_HOLD_XFER - Driver is not starting the transfer. Use this flag if the transfer is triggered externally by PPI. Use nrfx_spim_start_task_get to get the address of the start task.
NRFX_SPIM_FLAG_NO_XFER_EVT_HANDLER - No user event handler after transfer completion. This also means no interrupt at the end of the transfer. If NRFX_SPIM_FLAG_NO_XFER_EVT_HANDLER is used, the driver does not set the instance into busy state, so you must ensure that the next transfers are set up when SPIM is not active. nrfx_spim_end_event_get function can be used to detect end of transfer. Option can be used together with NRFX_SPIM_FLAG_REPEATED_XFER to prepare a sequence of SPI transfers without interruptions.
NRFX_SPIM_FLAG_REPEATED_XFER - Prepare for repeated transfers. You can set up a number of transfers that will be triggered externally (for example by PPI). An example is a TXRX transfer with the options NRFX_SPIM_FLAG_RX_POSTINC, NRFX_SPIM_FLAG_NO_XFER_EVT_HANDLER, and NRFX_SPIM_FLAG_REPEATED_XFER. After the transfer is set up, a set of transfers can be triggered by PPI that will read, for example, the same register of an external component and put it into a RAM buffer without any interrupts. nrfx_spim_end_event_get can be used to get the address of the END event, which can be used to count the number of transfers. If NRFX_SPIM_FLAG_REPEATED_XFER is used, the driver does not set the instance into busy state, so you must ensure that the next transfers are set up when SPIM is not active.

Note: Peripherals using EasyDMA (including SPIM) require the transfer buffers to be placed in the Data RAM region. If this condition is not met, this function will fail with the error code NRFX_ERROR_INVALID_ADDR.

Parameters

p_instance	Pointer to the driver instance structure.
p_xfer_desc	Pointer to the transfer descriptor.
flags	Transfer options (0 for default settings).

Return values

NRFX_SUCCESS	The procedure is successful.
NRFX_ERROR_BUSY	The driver is not ready for a new transfer.
NRFX_ERROR_NOT_SUPPORTED	The provided parameters are not supported.
NRFX_ERROR_INVALID_ADDR	The provided buffers are not placed in the Data RAM region.

nrfx_err_t nrfx_spim_xfer_dcx	(	nrfx_spim_t const *const	p_instance,
		nrfx_spim_xfer_desc_t const *	p_xfer_desc,
		uint32_t	flags,
		uint8_t	cmd_length
	)

Function for starting the SPIM data transfer with DCX control.

See nrfx_spim_xfer for description of additional options of transfer provided by the flags parameter.

Note: Peripherals that use EasyDMA (including SPIM) require the transfer buffers to be placed in the Data RAM region. If this condition is not met, this function will fail with the error code NRFX_ERROR_INVALID_ADDR.

Parameters

p_instance	Pointer to the driver instance structure.
p_xfer_desc	Pointer to the transfer descriptor.
flags	Transfer options (0 for default settings).
cmd_length	Length of the command bytes preceding the data bytes. The DCX line will be low during transmission of command bytes and high during transmission of data bytes. Maximum value available for dividing the transmitted bytes into command bytes and data bytes is NRF_SPIM_DCX_CNT_ALL_CMD - 1. The NRF_SPIM_DCX_CNT_ALL_CMD value passed as the `cmd_length` parameter causes all transmitted bytes to be marked as command bytes.

Return values

NRFX_SUCCESS	The procedure is successful.
NRFX_ERROR_BUSY	The driver is not ready for a new transfer.
NRFX_ERROR_NOT_SUPPORTED	The provided parameters are not supported.
NRFX_ERROR_INVALID_ADDR	The provided buffers are not placed in the Data RAM region.

Modules

Data Structures

Macros

Typedefs

Enumerations

Functions

Detailed Description

Macro Definition Documentation

Enumeration Type Documentation

Function Documentation