spidev.h File Reference

RTEMS Port of Linux SPI API. More...

#include <sys/ioccom.h>
#include <stddef.h>
#include <stdint.h>

Go to the source code of this file.

Data Structures
struct	spi_ioc_transfer
	SPI transfer message. More...

Macros
#define	SPI_IOC_MAGIC   's'
#define	SPI_MSGSIZE(n)
	Calculates the size of the SPI message array. More...
#define	SPI_IOC_MESSAGE(n)   _IOW(SPI_IOC_MAGIC, 0, char[SPI_MSGSIZE(n)])
	Transfers an array with SPI messages.
#define	SPI_IOC_RD_MODE   _IOR(SPI_IOC_MAGIC, 1, uint8_t)
	Reads the least-significant 8-bits of the SPI default mode.
#define	SPI_IOC_WR_MODE   _IOW(SPI_IOC_MAGIC, 1, uint8_t)
	Writes the SPI default mode (the most-significant 24-bits of the mode are set to zero).
#define	SPI_IOC_RD_LSB_FIRST   _IOR(SPI_IOC_MAGIC, 2, uint8_t)
	Reads the SPI default least-significant bit first setting.
#define	SPI_IOC_WR_LSB_FIRST   _IOW(SPI_IOC_MAGIC, 2, uint8_t)
	Writes the SPI default least-significant-bit first setting.
#define	SPI_IOC_RD_BITS_PER_WORD   _IOR(SPI_IOC_MAGIC, 3, uint8_t)
	Reads the SPI default bits per word.
#define	SPI_IOC_WR_BITS_PER_WORD   _IOW(SPI_IOC_MAGIC, 3, uint8_t)
	Writes the SPI default bits per word.
#define	SPI_IOC_RD_MAX_SPEED_HZ   _IOR(SPI_IOC_MAGIC, 4, uint32_t)
	Reads the SPI default speed in Hz.
#define	SPI_IOC_WR_MAX_SPEED_HZ   _IOW(SPI_IOC_MAGIC, 4, uint32_t)
	Writes the SPI default speed in Hz.
#define	SPI_IOC_RD_MODE32   _IOR(SPI_IOC_MAGIC, 5, uint32_t)
	Reads the full 32-bit SPI default mode.
#define	SPI_IOC_WR_MODE32   _IOW(SPI_IOC_MAGIC, 5, uint32_t)
	Writes the full 32-bit SPI default mode.
SPI Transfer Flags
#define	SPI_CPHA   0x01
	SPI transfer flag which sets the clock phase.
#define	SPI_CPOL   0x02
	SPI transfer flag which sets the clock polarity.
#define	SPI_MODE_0   0
	SPI transfer flag which sets SPI Mode 0 (clock starts low, sample on leading edge).
#define	SPI_MODE_1   SPI_CPHA
	SPI transfer flag which sets SPI Mode 0 (clock starts low, sample on trailing edge).
#define	SPI_MODE_2   SPI_CPOL
	SPI transfer flag which sets SPI Mode 0 (clock starts high, sample on leading edge).
#define	SPI_MODE_3   (SPI_CPOL | SPI_CPHA)
	SPI transfer flag which sets SPI Mode 0 (clock starts high, sample on trailing edge).
#define	SPI_CS_HIGH   0x04
	SPI transfer flag which selects the device by setting the chip select line.
#define	SPI_LSB_FIRST   0x08
	SPI transfer flag which triggers data transmission with the LSB being sent first.
#define	SPI_3WIRE   0x10
	SPI transfer flag which uses a shared wire for master input/slave output as well as master output/slave input.
#define	SPI_LOOP   0x20
	SPI transfer flag which initiates the loopback mode.
#define	SPI_NO_CS   0x40
	SPI transfer flag which indicates that no chip select is needed due to only one device on the bus.
#define	SPI_READY   0x80
	SPI transfer flag which pulls the slave to low level during pause.
#define	SPI_TX_DUAL   0x100
	SPI transfer flag which sets up dual mode for transmission.
#define	SPI_TX_QUAD   0x200
	SPI transfer flag which sets up quad mode for transmission.
#define	SPI_RX_DUAL   0x400
	SPI transfer flag which sets up dual mode for reception.
#define	SPI_RX_QUAD   0x800
	SPI transfer flag which sets up quad mode for reception.

Detailed Description

RTEMS Port of Linux SPI API.