twimaster.c File Reference

#include <inttypes.h>
#include <compat/twi.h>
#include "i2cmaster.h"

Go to the source code of this file.

Macros
#define	F_CPU   16000000UL
#define	SCL_CLOCK   100000L

Functions
void	i2c_init (void)
	initialize the I2C master interace. Need to be called only once More...
unsigned char	i2c_start (unsigned char address)
	Issues a start condition and sends address and transfer direction. More...
void	i2c_start_wait (unsigned char address)
	Issues a start condition and sends address and transfer direction. More...
unsigned char	i2c_rep_start (unsigned char address)
	Issues a repeated start condition and sends address and transfer direction. More...
void	i2c_stop (void)
	Terminates the data transfer and releases the I2C bus. 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...

Macro Definition Documentation

#define F_CPU   16000000UL

Definition at line 17 of file twimaster.c.

#define SCL_CLOCK   100000L

Definition at line 21 of file twimaster.c.

Function Documentation

void i2c_init

(

void

)

initialize the I2C master interace. Need to be called only once

Parameters

void

Returns

none

Definition at line 27 of file twimaster.c.

unsigned char i2c_readAck

(

void

)

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

Returns

byte read from I2C device

Definition at line 180 of file twimaster.c.

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

Definition at line 195 of file twimaster.c.

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

Definition at line 128 of file twimaster.c.

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

Definition at line 41 of file twimaster.c.

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

Definition at line 77 of file twimaster.c.

void i2c_stop

(

void

)

Terminates the data transfer and releases the I2C bus.

Parameters

void

Returns

none

Definition at line 138 of file twimaster.c.

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

Definition at line 156 of file twimaster.c.