spi.c File Reference

Support for the SPI bus on the Raspberry Pi GPIO P1 header (model A/B) and GPIO J8 header on model B+. More...

#include <bsp.h>
#include <bsp/raspberrypi.h>
#include <bsp/gpio.h>
#include <bsp/rpi-gpio.h>
#include <bsp/irq.h>
#include <bsp/spi.h>
#include <assert.h>

Data Structures
struct	rpi_spi_softc_t
	Object containing the SPI bus configuration settings. More...
struct	rpi_spi_desc_t
	Object containing the SPI bus description. More...

Macros
#define	SPI_POLLING(condition)

Functions
int	rpi_spi_init (bool bidirectional_mode)
	Setups the Raspberry Pi SPI bus (located on the GPIO header) on the "/dev/spi" device file, and registers the bus on the libi2c API. More...

Detailed Description

Support for the SPI bus on the Raspberry Pi GPIO P1 header (model A/B) and GPIO J8 header on model B+.

Macro Definition Documentation

SPI_POLLING

#define SPI_POLLING

(

condition

)

Value:

  while ( condition ) {                         \
    ;                                           \
  }

Function Documentation

rpi_spi_init()

int rpi_spi_init

(

bool

bidirectional_mode

)

Setups the Raspberry Pi SPI bus (located on the GPIO header) on the "/dev/spi" device file, and registers the bus on the libi2c API.

Parameters

[in]

bidirectional_mode

If TRUE sets the SPI bus to use 2-wire SPI, where the MOSI data line doubles as the slave out (SO) and slave in (SI) data lines. If FALSE the bus defaults to the usual 3-wire SPI, with 2 separate data lines (MOSI and MISO).

Return values

Returns	libi2c bus number.
<0	Could not register the bus. See

See also

rtems_libi2c_register_bus().