#include <avr/io.h>
#include <avr/interrupt.h>

Include dependency graph for eeprom.c:

Macros
#define	EEPE EEWE
	EEPROM program/write enable. More...

#define	EEMPE EEMWE
	EEPROM master program/write enable. More...

#define	EEPM1 5
	EEPROM Programming Mode Bit 1. More...

#define	EEPM0 4
	EEPROM Programming Mode Bit 0. More...

#define	EEPROM_IGNORE_SELFPROG
	Remove SPM flag polling. More...

Functions
unsigned char	eeprom_get_char (unsigned int addr)
	Read byte from EEPROM. More...

void	eeprom_put_char (unsigned int addr, unsigned char new_value)
	Write byte to EEPROM. More...

void	memcpy_to_eeprom_with_checksum (unsigned int destination, char *source, unsigned int size)

int	memcpy_from_eeprom_with_checksum (char *destination, unsigned int source, unsigned int size)

Detailed Description

Atmel Corporation

File: eeprom.c
Compiler: IAR EWAAVR 3.10c
Support mail: avr@a.nosp@m.tmel.nosp@m..com

Supported devices: All devices with split EEPROM erase/write capabilities can be used. The example is written for ATmega48.

AppNote: AVR103 - Using the EEPROM Programming Modes.

Description: Example on how to use the split EEPROM erase/write capabilities in e.g. ATmega48. All EEPROM programming modes are tested, i.e. Erase+Write, Erase-only and Write-only.

Revision: 1.6

Date: Friday, February 11, 2005 07:16:44 UTC

Definition in file eeprom.c.

Macro Definition Documentation

◆ EEMPE

#define EEMPE EEMWE

EEPROM master program/write enable.

Definition at line 30 of file eeprom.c.

◆ EEPE

#define EEPE EEWE

EEPROM program/write enable.

Definition at line 29 of file eeprom.c.

◆ EEPM0

#define EEPM0 4

EEPROM Programming Mode Bit 0.

Definition at line 35 of file eeprom.c.

◆ EEPM1

#define EEPM1 5

EEPROM Programming Mode Bit 1.

Definition at line 34 of file eeprom.c.

◆ EEPROM_IGNORE_SELFPROG

#define EEPROM_IGNORE_SELFPROG

Remove SPM flag polling.

Definition at line 38 of file eeprom.c.

Function Documentation

◆ eeprom_get_char()

unsigned char eeprom_get_char ( unsigned int addr )

Read byte from EEPROM.

This function reads one byte from a given EEPROM address.

Note: The CPU is halted for 4 clock cycles during EEPROM read.

Parameters

addr	EEPROM address to read from.

Returns: The byte read from the EEPROM address.

Definition at line 49 of file eeprom.c.

◆ eeprom_put_char()

void eeprom_put_char	(	unsigned int	addr,
		unsigned char	new_value
	)

Write byte to EEPROM.

This function writes one byte to a given EEPROM address. The differences between the existing byte and the new value is used to select the most efficient EEPROM programming mode.

Note: The CPU is halted for 2 clock cycles during EEPROM programming.; When this function returns, the new EEPROM value is not available until the EEPROM programming time has passed. The EEPE bit in EECR should be polled to check whether the programming is finished.; The EEPROM_GetChar() function checks the EEPE bit automatically.

Parameters

addr	EEPROM address to write to.
new_value	New EEPROM value.

Definition at line 74 of file eeprom.c.

◆ memcpy_from_eeprom_with_checksum()

int memcpy_from_eeprom_with_checksum	(	char *	destination,
		unsigned int	source,
		unsigned int	size
	)

Definition at line 140 of file eeprom.c.

◆ memcpy_to_eeprom_with_checksum()

void memcpy_to_eeprom_with_checksum	(	unsigned int	destination,
		char *	source,
		unsigned int	size
	)

Definition at line 130 of file eeprom.c.

Macros

Functions