SENDER:


#include <avr/io.h>
#include <util/delay.h>

#ifndef F_CPU
#warning "F_CPU not defined. defining now"
#define F_CPU 12000000UL	/*12 Mhz*/
#endif
int main(void)
{


	// USART
	long Baudrate =  4800;
	
	UBRRH  = (unsigned char)((F_CPU / (16 * Baudrate) - 1) >> 8);
	UBRRL  = (unsigned char)(F_CPU / (16 * Baudrate) - 1);	// set baudrate
	UCSRB = (1<<TXEN) | (1<<RXEN);							// enable receiver and transmitter
	UCSRC = (1<<URSEL) | (1<<USBS) | (3<<UCSZ0);			// frame mode 8 bit, 2 stopbits, asynchronous
	
	// UART
	while(1==1) {
		while ( !(UCSRA & (1<<UDRE)));
		UDR = 'A';
		while ( !(UCSRA & (1<<UDRE)));
		UDR = 'B';
		while ( !(UCSRA & (1<<UDRE)));
		UDR = 'C';
		while ( !(UCSRA & (1<<UDRE)));
		UDR = 'D';
	}

	
	return 0;
}




Receiver:

#include <avr/io.h>
#include <util/delay.h>
#include <avr/eeprom.h>

#define EEPROM  __attribute__ ((section (".eeprom")))

#ifndef F_CPU
#define F_CPU 12000000UL
#endif

int main(void) {
	// USART
	long Baudrate = 4800;
	unsigned char buffer[32];	
	unsigned int i= 0;

	UBRRH  = (unsigned char)((F_CPU / (16 * Baudrate) - 1) >> 8);
	UBRRL  = (unsigned char)(F_CPU / (16 * Baudrate) - 1);	// set baudrate
	UCSRB  = (1<<TXEN) | (1<<RXEN);			// enable receiver and transmitter
	UCSRC  = (1<<URSEL) | (1<<USBS) | (3<<UCSZ0);		// frame mode 8 bit, 2 stopbits, asynchronous

	_delay_ms(10);
	// UART
	for(i=0; i<32; i++) {
		// Receiver
		while (!(UCSRA&(1<<RXC)));
		buffer[i] = UDR;

		// Sender
	/*	while ( !(UCSRA & (1<<UDRE)));
		UDR = 'F';*/
	}

	eeprom_write_block(&buffer,0,sizeof(buffer));

	
	return 0;
}


:100000000B130B131B230B131B230B131B230B13A0
:100010001B230B131B230B131B230B131B230B1370
:10002000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFE0
:10003000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFD0
:10004000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFC0
:10005000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFB0
:10006000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFA0
:10007000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF90
:10008000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF80
:10009000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF70
:1000A000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF60
:1000B000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF50
:1000C000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF40
:1000D000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF30
:1000E000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF20
:1000F000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF10
:10010000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF
:10011000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEF
:10012000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFDF
:10013000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFCF
:10014000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFBF
:10015000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFAF
:10016000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF9F
:10017000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF8F
:10018000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF7F
:10019000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF6F
:1001A000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5F
:1001B000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF4F
:1001C000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF3F
:1001D000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF2F
:1001E000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF1F
:1001F000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF0F
:00000001FF



###############################################################################
# Makefile for the project mega16
###############################################################################

## General Flags
PROJECT = mega16
MCU = atmega16
TARGET = mega16.elf
CC = avr-gcc.exe

## Options common to compile, link and assembly rules
COMMON = -mmcu=$(MCU)

## Compile options common for all C compilation units.
CFLAGS = $(COMMON)
CFLAGS += -Wall -gdwarf-2 -std=gnu99         -DF_CPU=12000000UL -Os -funsigned-char -funsigned-bitfields -fpack-struct -fshort-enums
CFLAGS += -MD -MP -MT $(*F).o -MF dep/$(@F).d 

## Assembly specific flags
ASMFLAGS = $(COMMON)
ASMFLAGS += $(CFLAGS)
ASMFLAGS += -x assembler-with-cpp -Wa,-gdwarf2

## Linker flags
LDFLAGS = $(COMMON)
LDFLAGS +=  -Wl,-Map=mega16.map


## Intel Hex file production flags
HEX_FLASH_FLAGS = -R .eeprom

HEX_EEPROM_FLAGS = -j .eeprom
HEX_EEPROM_FLAGS += --set-section-flags=.eeprom="alloc,load"
HEX_EEPROM_FLAGS += --change-section-lma .eeprom=0 --no-change-warnings


## Objects that must be built in order to link
OBJECTS = mega16.o 

## Objects explicitly added by the user
LINKONLYOBJECTS = 

## Build
all: $(TARGET) mega16.hex mega16.eep mega16.lss size

## Compile
mega16.o: ../mega16.c
	$(CC) $(INCLUDES) $(CFLAGS) -c  $<

##Link
$(TARGET): $(OBJECTS)
	 $(CC) $(LDFLAGS) $(OBJECTS) $(LINKONLYOBJECTS) $(LIBDIRS) $(LIBS) -o $(TARGET)

%.hex: $(TARGET)
	avr-objcopy -O ihex $(HEX_FLASH_FLAGS)  $< $@

%.eep: $(TARGET)
	-avr-objcopy $(HEX_EEPROM_FLAGS) -O ihex $< $@ || exit 0

%.lss: $(TARGET)
	avr-objdump -h -S $< > $@

size: ${TARGET}
	@echo
	@avr-size -C --mcu=${MCU} ${TARGET}

## Clean target
.PHONY: clean
clean:
	-rm -rf $(OBJECTS) mega16.elf dep/* mega16.hex mega16.eep mega16.lss mega16.map


## Other dependencies
-include $(shell mkdir dep 2>/dev/null) $(wildcard dep/*)