#ifndef defines_i2c
#define defines_i2c

#include <avr/io.h>
#include "defines.h"

#define  i2cbitdelay 50

#define  I2C_ACK  1 
#define  I2C_NAK  0

#define SCLPORT PORTD
#define SDAPORT PORTD
#define SDAPIN 7
#define SCLPIN 8
#define SCLDDR DDRD
#define SDADDR DDRD


#define i2c_scl_release() bitClear(SCLDDR,SCLPIN); 
#define i2c_sda_release() bitClear(SDADDR,SDAPIN);

// sets SCL low and drives output
#define i2c_scl_lo() bitClear(SCLPORT,SCLPIN); bitSet(SCLDDR,SCLPIN);

// sets SDA low and drives output
#define i2c_sda_lo() bitClear(SDAPORT,SCLPIN); bitSet(SDADDR,SDAPIN);

// set SCL high and to input (releases pin) (i.e. change to input,turnon pullup)
#define i2c_scl_hi() bitClear(SCLDDR,SCLPIN);bitSet(SCLPORT,SCLPIN);

// set SDA high and to input (releases pin) (i.e. change to input,turnon pullup)
#define i2c_sda_hi() bitClear(SDADDR,SDAPIN);bitSet(SDAPORT,SDAPIN);

void i2c_init(void);

void i2c_writebit( uint8_t c );
uint8_t i2c_readbit(void);
void i2c_start(void);
void i2c_repstart(void);
void i2c_stop(void);
uint8_t i2c_write( uint8_t c );
uint8_t i2c_read( uint8_t ack );

#endif