spi.h File Reference

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Typedefs
typedef void(*	spi_on_transfer_done_cb_f) (spi_res_e res, spi_xfer_t *xfer_p)

Functions
spi_res_e	SPI_init (spi_conf_t *conf_p)
	Initialize SPI module. More...
spi_res_e	SPI_close ()
	Close an already initialized SPI module. More...
spi_res_e	SPI_transfer (spi_xfer_t *xfer_p, spi_on_transfer_done_cb_f cb)
	Enable or disable USART. More...

Data Structures
struct	spi_conf_t
struct	spi_xfer_t

Enumerations
enum	spi_mode_e { SPI_MODE_LOW_FIRST, SPI_MODE_LOW_SECOND, SPI_MODE_HIGH_FIRST, SPI_MODE_HIGH_SECOND }
	Simple minimal SPI master driver It only manages one SPI instance at a time. More...
enum	spi_bit_order_e { SPI_ORDER_MSB, SPI_ORDER_LSB }
enum	spi_res_e {   SPI_RES_OK, SPI_RES_INVALID_CONFIG, SPI_RES_INVALID_XFER, SPI_RES_NOT_INITIALIZED,   SPI_RES_ALREADY_INITIALIZED, SPI_RES_BUSY, SPI_RES_BLOCKING_NOT_AVAILABLE, SPI_RES_ONLY_BLOCKING_AVAILABLE }

Typedef Documentation

spi_on_transfer_done_cb_f

typedef void(* spi_on_transfer_done_cb_f) (spi_res_e res, spi_xfer_t *xfer_p)

User callback when transfer is done

Definition at line 65 of file spi.h.

Function Documentation

SPI_close()

spi_res_e SPI_close

(

)

Close an already initialized SPI module.

Returns

Return code of operation

SPI_init()

spi_res_e SPI_init

(

spi_conf_t *

conf_p

)

Initialize SPI module.

Parameters

conf_p

Pointer to an spi configuration

Returns

Return code of operation

Examples

ruuvi_evk/app.c.

SPI_transfer()

spi_res_e SPI_transfer	(	spi_xfer_t *	xfer_p,
		spi_on_transfer_done_cb_f	cb
	)

Enable or disable USART.

Parameters

xfer_p	Pointer to the transfert description
cb	Callback to call at end of transfer (Can be NULL for a blocking call)

Returns

Return code of operation

Note

Application is in charge to select the write slave with chip select signal

---

Data Structure Documentation

spi_conf_t

struct spi_conf_t

Structure to configure the SPI

Examples

ruuvi_evk/app.c.

Definition at line 34 of file spi.h.

Data Fields
spi_bit_order_e	bit_order
uint32_t	clock
spi_mode_e	mode

spi_xfer_t

struct spi_xfer_t

Structure to describe a SPI transfer

Definition at line 42 of file spi.h.

Data Fields
uint32_t	custom
uint8_t *	read_ptr
size_t	read_size
uint8_t *	write_ptr
size_t	write_size

Enumeration Type Documentation

spi_bit_order_e

enum spi_bit_order_e

Different bit orders

Enumerator
SPI_ORDER_MSB
SPI_ORDER_LSB

Definition at line 27 of file spi.h.

{
    SPI_ORDER_MSB,  //< Most Significant Bit first
    SPI_ORDER_LSB   //< Less Significant Bit first
} spi_bit_order_e;

spi_mode_e

enum spi_mode_e

Simple minimal SPI master driver It only manages one SPI instance at a time.

Different SPI modes

Enumerator
SPI_MODE_LOW_FIRST
SPI_MODE_LOW_SECOND
SPI_MODE_HIGH_FIRST
SPI_MODE_HIGH_SECOND

Definition at line 18 of file spi.h.

{
    SPI_MODE_LOW_FIRST,     //< Low Polarity, First Clock edge
    SPI_MODE_LOW_SECOND,    //< Low Polarity, Second Clock edge
    SPI_MODE_HIGH_FIRST,    //< High Polarity, First Clock edge
    SPI_MODE_HIGH_SECOND    //< High Polarity, Second Clock edge
} spi_mode_e;

spi_res_e

enum spi_res_e

Return codes of SPI functions

Enumerator
SPI_RES_OK
SPI_RES_INVALID_CONFIG
SPI_RES_INVALID_XFER
SPI_RES_NOT_INITIALIZED
SPI_RES_ALREADY_INITIALIZED
SPI_RES_BUSY
SPI_RES_BLOCKING_NOT_AVAILABLE
SPI_RES_ONLY_BLOCKING_AVAILABLE

Definition at line 52 of file spi.h.

{
    SPI_RES_OK,
    SPI_RES_INVALID_CONFIG,
    SPI_RES_INVALID_XFER,
    SPI_RES_NOT_INITIALIZED,
    SPI_RES_ALREADY_INITIALIZED,
    SPI_RES_BUSY,
    SPI_RES_BLOCKING_NOT_AVAILABLE,
    SPI_RES_ONLY_BLOCKING_AVAILABLE
} spi_res_e;