i2c.h File Reference

#include <avr/io.h>
#include <config.h>

Go to the source code of this file.

Defines
#define	TW_START   0x08
#define	TW_REP_START   0x10
#define	TW_MT_SLA_ACK   0x18
#define	TW_MT_SLA_NACK   0x20
#define	TW_MT_DATA_ACK   0x28
#define	TW_MT_DATA_NACK   0x30
#define	TW_MT_ARB_LOST   0x38
#define	TW_MR_ARB_LOST   0x38
#define	TW_MR_SLA_ACK   0x40
#define	TW_MR_SLA_NACK   0x48
#define	TW_MR_DATA_ACK   0x50
#define	TW_MR_DATA_NACK   0x58
#define	TW_ST_SLA_ACK   0xA8
#define	TW_ST_ARB_LOST_SLA_ACK   0xB0
#define	TW_ST_DATA_ACK   0xB8
#define	TW_ST_DATA_NACK   0xC0
#define	TW_ST_LAST_DATA   0xC8
#define	TW_SR_SLA_ACK   0x60
#define	TW_SR_ARB_LOST_SLA_ACK   0x68
#define	TW_SR_GCALL_ACK   0x70
#define	TW_SR_ARB_LOST_GCALL_ACK   0x78
#define	TW_SR_DATA_ACK   0x80
#define	TW_SR_DATA_NACK   0x88
#define	TW_SR_GCALL_DATA_ACK   0x90
#define	TW_SR_GCALL_DATA_NACK   0x98
#define	TW_SR_STOP   0xA0
#define	TW_NO_INFO   0xF8
#define	TW_BUS_ERROR   0x00
Functions
void	i2c_timerproc (void)
uint8_t	read_i2c_device (uint8_t address, uint8_t bytes, uint8_t *rdata)
	Read 1 or more bytes from an I2C device to memory.
uint8_t	write_i2c_device (uint8_t address, uint8_t bytes, uint8_t *wdata)
	Write 1 or more bytes to an I2C device from memory.
uint8_t	write_read_i2c_device (uint8_t address, uint8_t wbytes, uint8_t *wdata, uint8_t rbytes, uint8_t *rdata)
	Write 1 or more bytes to an I2C device followed by a read without releasing the bus.

---

Define Documentation

#define TW_BUS_ERROR   0x00

#define TW_MR_ARB_LOST   0x38

#define TW_MR_DATA_ACK   0x50

#define TW_MR_DATA_NACK   0x58

#define TW_MR_SLA_ACK   0x40

#define TW_MR_SLA_NACK   0x48

#define TW_MT_ARB_LOST   0x38

#define TW_MT_DATA_ACK   0x28

#define TW_MT_DATA_NACK   0x30

#define TW_MT_SLA_ACK   0x18

#define TW_MT_SLA_NACK   0x20

#define TW_NO_INFO   0xF8

#define TW_REP_START   0x10

#define TW_SR_ARB_LOST_GCALL_ACK   0x78

#define TW_SR_ARB_LOST_SLA_ACK   0x68

#define TW_SR_DATA_ACK   0x80

#define TW_SR_DATA_NACK   0x88

#define TW_SR_GCALL_ACK   0x70

#define TW_SR_GCALL_DATA_ACK   0x90

#define TW_SR_GCALL_DATA_NACK   0x98

#define TW_SR_SLA_ACK   0x60

#define TW_SR_STOP   0xA0

#define TW_ST_ARB_LOST_SLA_ACK   0xB0

#define TW_ST_DATA_ACK   0xB8

#define TW_ST_DATA_NACK   0xC0

#define TW_ST_LAST_DATA   0xC8

#define TW_ST_SLA_ACK   0xA8

#define TW_START   0x08

---

Function Documentation

void i2c_timerproc

(

void

)

uint8_t read_i2c_device	(	uint8_t	address,
		uint8_t	bytes,
		uint8_t *	rdata
	)

Read 1 or more bytes from an I2C device to memory.

Parameters:

	address	Address if I2C device. The bottom bit is set to enforce an I2C read.
	bytes	Number of bytes to be returned.
	*rdata	Pointer to location to store values returned.

Returns:

returns error code generated from I2C transaction, or 0 for success

uint8_t write_i2c_device	(	uint8_t	address,
		uint8_t	bytes,
		uint8_t *	wdata
	)

Write 1 or more bytes to an I2C device from memory.

Parameters:

	address	Address if I2C device. The bottom bit is cleared to enforce an I2C write.
	bytes	Number of data bytes to be sent.
	*wdata	Pointer to location in memory of first byte of set of data.

Returns:

returns error code generated from I2C transaction, or 0 for success

uint8_t write_read_i2c_device	(	uint8_t	address,
		uint8_t	wbytes,
		uint8_t *	wdata,
		uint8_t	rbytes,
		uint8_t *	rdata
	)

Write 1 or more bytes to an I2C device followed by a read without releasing the bus.

Parameters:

	address	Address if I2C device. The bottom bit is manipulated as appropriate for R/W
	wbytes	Number of bytes to write.
	*wdata	Pointer to location in memory of first byte to write.
	rbytes	Number of bytes to read.
	*rdata	Pointer to location in memory of first byte of set of data.

Returns:

returns error code generated from I2C transaction, or 0 for success