SPI bus control. More...

#include <spi.h>

Data Fields
int(*	transfer )(spi_bus bus, const spi_ioc_transfer msgs, uint32_t msg_count)
	Transfers SPI messages.

int(*	setup )(spi_bus *bus)
	Checks if maximum speed and bits per word are in a valid range for the device.

void(*	destroy )(spi_bus *bus)
	Destroys the bus.

rtems_recursive_mutex	mutex
	Mutex to protect the bus access.

uint32_t	max_speed_hz
	Maximum Speed in Hz.

uint32_t	speed_hz
	Indicates the speed of the current device message.

bool	cs_change
	Indicates if chip select must be set high after transfer.

uint8_t	cs
	Indicates which device is selected by chip select.

uint8_t	bits_per_word
	Indicates the bits per word used on the device.

bool	lsb_first
	Indicates if LSB is supposed to be transmitted first.

uint32_t	mode
	Current mode.

uint16_t	delay_usecs
	Indicates the delay between transfers on different chip select devices.

int(*	ioctl )(spi_bus bus, ioctl_command_t command, void arg)
	Driver specific ioctl.

Detailed Description

SPI bus control.

Field Documentation

void(* spi_bus::destroy) (spi_bus *bus)

Destroys the bus.

Parameters

[in] bus The bus control.

int(* spi_bus::ioctl) (spi_bus *bus, ioctl_command_t command, void *arg)

Driver specific ioctl.

Parameters

[in] bus The bus control.

int(* spi_bus::setup) (spi_bus *bus)

Checks if maximum speed and bits per word are in a valid range for the device.

Parameters

[in] bus The bus control.

Return values

0	Successful operation.
negative	Negative error number in case of an error.

int(* spi_bus::transfer) (spi_bus *bus, const spi_ioc_transfer *msgs, uint32_t msg_count)

Transfers SPI messages.

Parameters

[in]	bus	The bus control.
[in]	msgs	The messages to transfer.
[in]	msg_count	The count of messages to transfer. It must be positive.

Return values

0	Successful operation.
negative	Negative error number in case of an error.

The documentation for this struct was generated from the following file: