SPI

SPI library functions. More...

Functions
int	spi_init (uint8_t channel)
	Initialises the spidev interface.
int	spi_config (int fd, uint8_t mode, uint8_t bits, uint32_t speed, uint16_t delay)
	Configures the spidev interface.
int	spi_config_default (int fd)
	Configures the spidev interface with default values.
int	spi_transfer (int fd, uint8_t txbuf[], uint8_t rxbuf[], uint8_t len)
	Initiates SPI transfers.

Detailed Description

SPI library functions.

Function Documentation

int spi_config	(	int	fd,
		uint8_t	mode,
		uint8_t	bits,
		uint32_t	speed,
		uint16_t	delay
	)

Configures the spidev interface.

Parameters

fd	File descriptor to use, can be acquired via spi_init()
mode	SPI mode
bits	Number of bits
speed	Bus speed
delay	Amount of delay

Returns

1 for success, -1 for failure

Definition at line 116 of file pi_spi.c.

int spi_config_default

(

int

fd

)

Configures the spidev interface with default values.

Parameters

fd	File descriptor to use, can be acquired via spi_init()

Returns

1 for success, -1 for failure

Definition at line 155 of file pi_spi.c.

int spi_init

(

uint8_t

channel

)

Initialises the spidev interface.

Parameters

channel

SPI channel to use (0 or 1)

Returns

1 for success, -1 for failure

Definition at line 53 of file pi_spi.c.

int spi_transfer	(	int	fd,
		uint8_t	txbuf[],
		uint8_t	rxbuf[],
		uint8_t	len
	)

Initiates SPI transfers.

Parameters

fd	File descriptor to use, can be acquired via spi_init()
txbuf	Transmit buffer array
rxbuf	Receive buffer array
len	Length of transfer

Returns

1 for success, -1 for failure

Definition at line 175 of file pi_spi.c.