#include <avr/io.h>

Include dependency graph for i2cmaster.h:

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#define	I2C_READ 1
	defines the data direction (reading from I2C device) in i2c_start(),i2c_rep_start() More...

#define	I2C_WRITE 0
	defines the data direction (writing to I2C device) in i2c_start(),i2c_rep_start() More...

#define	i2c_read(ack) (ack) ? i2c_readAck() : i2c_readNak();

void	i2c_init (void)
	initialize the I2C master interace. More...

void	i2c_stop (void)
	Terminates the data transfer and releases the I2C bus More...

unsigned char	i2c_start (unsigned char addr)
	Issues a start condition and sends address and transfer direction More...

unsigned char	i2c_rep_start (unsigned char addr)
	Issues a repeated start condition and sends address and transfer direction More...

void	i2c_start_wait (unsigned char addr)
	Issues a start condition and sends address and transfer direction More...

unsigned char	i2c_write (unsigned char data)
	Send one byte to I2C device More...

unsigned char	i2c_readAck (void)
	read one byte from the I2C device, request more data from device More...

unsigned char	i2c_readNak (void)
	read one byte from the I2C device, read is followed by a stop condition More...

unsigned char	i2c_read (unsigned char ack)
	read one byte from the I2C device More...

Macro Definition Documentation

◆ I2C_READ

#define I2C_READ 1

defines the data direction (reading from I2C device) in i2c_start(),i2c_rep_start()

◆ i2c_read

#define i2c_read ( ack ) (ack) ? i2c_readAck() : i2c_readNak();

◆ I2C_WRITE

#define I2C_WRITE 0

defines the data direction (writing to I2C device) in i2c_start(),i2c_rep_start()

Function Documentation

◆ i2c_init()

void i2c_init ( void )

initialize the I2C master interace.

Need to be called only once

Parameters

void

Returns: none

◆ i2c_read()

unsigned char i2c_read ( unsigned char ack )

read one byte from the I2C device

Implemented as a macro, which calls either i2c_readAck or i2c_readNak

Parameters

ack	1 send ack, request more data from device 0 send nak, read is followed by a stop condition

Returns: byte read from I2C device

◆ i2c_readAck()

unsigned char i2c_readAck ( void )

read one byte from the I2C device, request more data from device

Returns: byte read from I2C device

◆ i2c_readNak()

unsigned char i2c_readNak ( void )

read one byte from the I2C device, read is followed by a stop condition

Returns: byte read from I2C device

◆ i2c_rep_start()

unsigned char i2c_rep_start ( unsigned char addr )

Issues a repeated start condition and sends address and transfer direction

Parameters

addr	address and transfer direction of I2C device

Return values

0	device accessible
1	failed to access device

◆ i2c_start()

unsigned char i2c_start ( unsigned char addr )

Issues a start condition and sends address and transfer direction

Parameters

addr	address and transfer direction of I2C device

Return values

0	device accessible
1	failed to access device

◆ i2c_start_wait()

void i2c_start_wait ( unsigned char addr )

Issues a start condition and sends address and transfer direction

If device is busy, use ack polling to wait until device ready

Parameters

addr	address and transfer direction of I2C device

Returns: none

◆ i2c_stop()

void i2c_stop ( void )

Terminates the data transfer and releases the I2C bus

Parameters

void

Returns: none

◆ i2c_write()

unsigned char i2c_write ( unsigned char data )

Send one byte to I2C device

Parameters

data	byte to be transfered

Return values

0	write successful
1	write failed