i2c_drvr_4313.c File Reference

Low level I2C driver functions for the ATtiny4313. More...

#include "i2c_drvr_4313.h"
#include "i2c.h"
#include <avr/io.h>
#include <avr/cpufunc.h>
#include <stdint.h>

Functions
retval_t	check_ack (void)
void	set_SDA (uint8_t val)
void	set_SCL (uint8_t val)
uint8_t	read_SDA (void)
void	write_ack (uint8_t val)
retval_t	i2c_drvr_init (void)
retval_t	i2c_drvr_start (uint8_t addr_with_mode)
retval_t	i2c_drvr_end (void)
retval_t	i2c_drvr_write_byte (uint8_t byte_to_tx)
retval_t	i2c_drvr_read_byte (uint8_t *byte_read_ptr, uint8_t ack)

Detailed Description

Low level I2C driver functions for the ATtiny4313.

Function Documentation

check_ack()

retval_t check_ack

(

void

)

Checks is the slave asserts an acknowledge condition on the I2C bus.

Parameters

[out]

retval

(retval_t): Returns if the slave acknowledged.

i2c_drvr_end()

retval_t i2c_drvr_end

(

void

)

Creates an end condition and returns if it was successful.

Parameters

[out]

retval

(retval_t): Returns if the end condition worked.

i2c_drvr_init()

retval_t i2c_drvr_init

(

void

)

Initializes the I2C lines.

Parameters

[out]

retval

(retval_t): Returns if the initialization worked.

i2c_drvr_read_byte()

retval_t i2c_drvr_read_byte	(	uint8_t *	byte_read_ptr,
		uint8_t	ack
	)

Reads a byte of information to from the I2C line.

Parameters

[in]	byte_read_ptr	(uint8_t *): Location to return the read back value.
[in]	ack	(uint8_t): Whether or not to acknowledge the byte.
[out]	retval	(retval_t): Returns if the read was successful.

i2c_drvr_start()

retval_t i2c_drvr_start

(

uint8_t

addr_with_mode

)

Creates a start condition, addresses the chip and returns if it was successful.

Parameters

[in]	addr_with_mode	(uint8_t): Address of the chip with mode set.
[out]	retval	(retval_t): Returns if the start condition worked.

i2c_drvr_write_byte()

retval_t i2c_drvr_write_byte

(

uint8_t

byte_to_tx

)

Writes a byte of information to the I2C line.

Parameters

[in]	byte_to_tx	(uint8_t): Byte to transmit.
[out]	retval	(retval_t): Returns if the byte write was acknowledged.

read_SDA()

uint8_t read_SDA

(

void

)

Reads the state of the SDA line.

Parameters

[out]

SDA_state

(uint8_t): State of the SDA line.

set_SCL()

void set_SCL

(

uint8_t

val

)

Drives the SCL line low or lets it go high.

Parameters

[in]

val

(uint8_t): Value to set the SCL line to. (high or low)

set_SDA()

void set_SDA

(

uint8_t

val

)

Drives the SDA line low or lets it go high.

Parameters

[in]

val

(uint8_t): Value to set the SDA line to. (high or low)

write_ack()

void write_ack

(

uint8_t

val

)

Writes an acknowledge or neg-ack to the I2C bus.

Parameters

[in]	ack	(uint8_t): Whether or not to acknowledge
[out]	retval	(retval_t): Returns if the read was successful.