spi_config Struct Reference

SPI controller configuration structure. More...

#include <spi.h>

Data Fields
uint32_t	frequency
uint16_t	operation
uint16_t	slave
const struct spi_cs_control *	cs

Detailed Description

SPI controller configuration structure.

Parameters

frequency	is the bus frequency in Hertz
operation	is a bit field with the following parts: operational mode [ 0 ] - master or slave. mode [ 1 : 3 ] - Polarity, phase and loop mode. transfer [ 4 ] - LSB or MSB first. word_size [ 5 : 10 ] - Size of a data frame in bits. lines [ 11 : 12 ] - MISO lines: Single/Dual/Quad/Octal. cs_hold [ 13 ] - Hold on the CS line if possible. lock_on [ 14 ] - Keep resource locked for the caller. cs_active_high [ 15 ] - Active high CS logic.
slave	is the slave number from 0 to host controller slave limit.
cs	is a valid pointer on a struct spi_cs_control is CS line is emulated through a gpio line, or NULL otherwise.

Note

Only cs_hold and lock_on can be changed between consecutive transceive call. Rest of the attributes are not meant to be tweaked.

Warning

Most drivers use pointer comparison to determine whether a passed configuration is different from one used in a previous transaction. Changes to fields in the structure may not be detected.

Field Documentation

cs

const struct spi_cs_control* spi_config::cs

frequency

uint32_t spi_config::frequency

operation

uint16_t spi_config::operation

slave

uint16_t spi_config::slave

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

• include/drivers/spi.h