AVR Freaks

Thank you! I don't know that I ever would have found that. Now if I can just get it to work properly.... :D

Play tricks again! Where problem?
Code:

#include "spi.h"

#include
#include

#define PORT_SPI PORTB
#define DDR_SPI DDRB
#define DD_MISO DDB4
#define DD_MOSI DDB3
#define DD_SS DDB2
#define DD_SCK DDB5

void spi_init()
// Initialize pins for spi communication
{
DDR_SPI &= ~((1<<DD_MOSI)|(1<<DD_MISO)|(1<<DD_SS)|(1<<DD_SCK));
// Define the following pins as output
DDR_SPI |= ((1<<DD_MOSI)|(1<<DD_SS)|(1<<DD_SCK));

SPCR = ((1<<SPE)| // SPI Enable
(0<<SPIE)| // SPI Interupt Enable
(0<<DORD)| // Data Order (0:MSB first / 1:LSB first)
(1<<MSTR)| // Master/Slave select
(0<<SPR1)|(1<<SPR0)| // SPI Clock Rate
(0<<CPOL)| // Clock Polarity (0:SCK low / 1:SCK hi when idle)
(0<<CPHA)); // Clock Phase (0:leading / 1:trailing edge sampling)

SPSR = (1<<SPI2X); // Double Clock Rate

}
/*
void spi_transfer_sync (uint8_t * dataout, uint8_t * datain, uint8_t len)
// Shift full array through target device
{
uint8_t i;
for (i = 0; i < len; i++) {
SPDR = dataout[i];
while((SPSR & (1<<SPIF))==0);
datain[i] = SPDR;
}

*/

void spi_transmit_sync (uint8_t * dataout, uint8_t len)
// Shift full array to target device without receiving any byte
{
uint8_t i;
for (i = 0; i < len; i++) {
SPDR = dataout[i];
while((SPSR & (1<<SPIF))==0);
}
/*

uint8_t spi_fast_shift (uint8_t data)
// Clocks only one byte to target device and returns the received one
{
SPDR = data;
while((SPSR & (1<<SPIF))==0);
return SPDR;
}
*/
}
Message:
rm -rf spi.o spi.elf dep/* spi.hex spi.eep spi.lss spi.map
Build succeeded with 0 Warnings...
avr-gcc.exe -mmcu=atmega8 -Wall -gdwarf-2 -std=gnu99 -DF_CPU=4000000UL -O2 -funsigned-char -MD -MP -MT spi.o -MF dep/spi.o.d -c ../spi.c
avr-gcc.exe -mmcu=atmega8 -Wl,-Map=spi.map spi.o -o spi.elf
d:/winavr/bin/../lib/gcc/avr/4.3.0/../../../../avr/lib/avr4/crtm8.o:(.init9+0x0): undefined reference to `main'
make: *** [spi.elf] Error 1
Build failed with 1 errors and 0 warnings...

Makefile:

###############################################################################
# Makefile for the project spi
###############################################################################

## General Flags
PROJECT = spi
MCU = atmega8
TARGET = spi.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=4000000UL -O2 -funsigned-char
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=spi.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 = spi.o

## Objects explicitly added by the user
LINKONLYOBJECTS =

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

## Compile
spi.o: ../spi.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) spi.elf dep/* spi.hex spi.eep spi.lss spi.map

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

Where is problem?
Many other projects fooling too.
Please not beat me. Iam very new in Winavr,

Thank You Johan!

But in code problems.

Whats are from code
(uint8_t * dataout, uint8_t * datain, uint8_t len)
len?
datain? Inputs ? and how declare
dataout may be OK ... made output byte?