i2c.h File Reference

Raspberry Pi specific I2C definitions. More...

#include <dev/i2c/i2c.h>

Go to the source code of this file.

Macros
I2C constants.
#define	BSC_CORE_CLK_HZ   150000000
	BSC controller core clock rate in Hz.
#define	DEFAULT_BUS_CLOCK   100000
	Default bus clock.

Functions
I2C directives.
void	rpi_i2c_init (void)
	Setups the Raspberry Pi GPIO header to activate the BSC I2C bus.
int	rpi_i2c_register_bus (const char *bus_path, uint32_t bus_clock)
	Registers the Raspberry Pi BSC I2C bus with the Linux I2C User-Space API.

Detailed Description

Raspberry Pi specific I2C definitions.

Macro Definition Documentation

BSC_CORE_CLK_HZ

#define BSC_CORE_CLK_HZ   150000000

BSC controller core clock rate in Hz.

This is set to 150 MHz as per the BCM2835 datasheet.

DEFAULT_BUS_CLOCK

#define DEFAULT_BUS_CLOCK   100000

Default bus clock.

This sets the bus with a 100 kHz clock speed.

Function Documentation

rpi_i2c_register_bus()

int rpi_i2c_register_bus	(	const char *	bus_path,
		uint32_t	bus_clock
	)

Registers the Raspberry Pi BSC I2C bus with the Linux I2C User-Space API.

Parameters

[in]	bus_path	Path to the bus device file.
[in]	bus_clock	Bus clock in Hz.

Return values

0	Bus registered successfully.
<0	Could not register the bus. The return value is a negative errno code.