i2c_avr.c File Reference

Driver for the AVR ATMega TWI (implementation). More...

#include "hw/hw_cpu.h"
#include "cfg/cfg_i2c.h"
#include <cfg/log.h>
#include <cfg/debug.h>
#include <cfg/macros.h>
#include <cfg/module.h>
#include <cpu/detect.h>
#include <cpu/irq.h>
#include <drv/timer.h>
#include <drv/i2c.h>
#include <compat/twi.h>

Go to the source code of this file.


Functions

static bool i2c_builtin_start (void)
 Send START condition on the bus.
bool i2c_builtin_start_w (uint8_t id)
 Send START condition and select slave for write.
bool i2c_builtin_start_r (uint8_t id)
 Send START condition and select slave for read.
void i2c_builtin_stop (void)
 Send STOP condition.
bool i2c_builtin_put (const uint8_t data)
 Put a single byte in master transmitter mode to the selected slave device through the TWI bus.
int i2c_builtin_get (bool ack)
 Get 1 byte from slave in master transmitter mode to the selected slave device through the TWI bus.
void i2c_builtin_init (void)
 Initialize TWI module.

Detailed Description

Driver for the AVR ATMega TWI (implementation).

Version:
$Id$
Author:
Stefano Fedrigo <aleph@develer.com>

Bernie Innocenti <bernie@codewiz.org>

Definition in file i2c_avr.c.

Function Documentation

int i2c_builtin_get ( bool  ack  ) 

Get 1 byte from slave in master transmitter mode to the selected slave device through the TWI bus.

If ack is true issue a ACK after getting the byte, otherwise a NACK is issued.

Returns:
the byte read if ok, EOF on errors.

Definition at line 184 of file i2c_avr.c.

void i2c_builtin_init ( void   ) 

Initialize TWI module.

I2c builtin prototypes.

Definition at line 215 of file i2c_avr.c.

bool i2c_builtin_put ( const uint8_t  data  ) 

Put a single byte in master transmitter mode to the selected slave device through the TWI bus.

Returns:
true on success, false on error.

Definition at line 163 of file i2c_avr.c.

static bool i2c_builtin_start ( void   )  [static]

Send START condition on the bus.

Returns:
true on success, false otherwise.

Definition at line 70 of file i2c_avr.c.

bool i2c_builtin_start_r ( uint8_t  id  ) 

Send START condition and select slave for read.

id is the device id comprehensive of address left shifted by 1. The LSB of id is ignored and set to 1 for read operation.

Returns:
true on success, false otherwise.

Definition at line 130 of file i2c_avr.c.

bool i2c_builtin_start_w ( uint8_t  id  ) 

Send START condition and select slave for write.

id is the device id comprehensive of address left shifted by 1. The LSB of id is ignored and reset to 0 for write operation.

Returns:
true on success, false otherwise.

Definition at line 90 of file i2c_avr.c.