spi.h File Reference

Raspberry Pi specific SPI definitions. More...

#include <rtems/libi2c.h>

Go to the source code of this file.

Macros
SPI constants.
#define	GPU_CORE_CLOCK_RATE   250000000
	GPU processor core clock rate in Hz. More...

Functions
SPI directives.
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

Raspberry Pi specific SPI definitions.

Macro Definition Documentation

GPU_CORE_CLOCK_RATE

#define GPU_CORE_CLOCK_RATE   250000000

GPU processor core clock rate in Hz.

Unless configured otherwise on a "config.txt" file present on the SD card the GPU defaults to 250 MHz. Currently only 250 MHz is supported.

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().