i2c.c File Reference

Support for the I2C 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/i2c.h>
#include <assert.h>

Data Structures
struct	rpi_i2c_bus
	Object containing relevant information about an I2C bus. More...

Macros
#define	TRANSFER_COUNT(buffer_size)
#define	ADJUST_TRANSFER_SIZE(transfer_count, remaining_bytes)
#define	I2C_POLLING(condition)

Functions
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.
void	rpi_i2c_init (void)
	Setups the Raspberry Pi GPIO header to activate the BSC I2C bus.

Detailed Description

Support for the I2C bus on the Raspberry Pi GPIO P1 header (model A/B) and GPIO J8 header on model B+.

Macro Definition Documentation

ADJUST_TRANSFER_SIZE

#define ADJUST_TRANSFER_SIZE	(		transfer_count,
			remaining_bytes )

Value:

transfer_count > 1 ? 0xFFFF : (remaining_bytes & 0xFFFF)

I2C_POLLING

#define I2C_POLLING

(

condition

)

Value:

while ( condition ) {                         \
  ;                                           \
}

TRANSFER_COUNT

#define TRANSFER_COUNT

(

buffer_size

)

Value:

(buffer_size + 0xFFFE) / 0xFFFF

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.