3410 display an AVR, code funktioniert nicht

#include <avr/io.h>

#include <stdlib.h>

#include <util/delay.h>

#define LCD_CS PB1    // 0 = active

#define LCD_DC PB0    // command: DC = 0   |    data: DC = 1

#define LCD_RES PD7    // 0 = reset

#define SS PB2

#define MOSI PB3

#define MISO PB4

#define SCK PB5

#define LCD_ENABLE   PORTB&=~(1<<LCD_CS)

#define LCD_DISABLE PORTB|=(1<<LCD_CS)

#define LCD_DATA   PORTB|=(1<<LCD_DC)

#define LCD_COMMAND PORTB&=~(1<<LCD_DC)

// prototypes:

void lcd_command(unsigned char command);

void lcd_data(unsigned char data);

unsigned char spi_putc(unsigned char byte_in);

int main(void)

{  

  DDRD |= (1<<LCD_RES);

  PORTD &= ~(1<<LCD_RES);

  DDRB |= ((1<<SS) | (1<<LCD_CS) | (1<<LCD_DC) | (1<<SCK) | (1<<MOSI));  // output

  DDRB &= ~(1<<MISO); // input

  PORTB |= ((1<<SS) | (1<<LCD_CS) | (1<<LCD_DC));  // pullups

  // low pulse to RES-pin to enable LCD

  _delay_ms(100);

  PORTD |= (1<<LCD_RES);

  // enable spi

  SPCR |= ((1<<SPE)|(1<<MSTR)|(1<<SPR0)); //Enable SPI, SPI in Master Mode, presc = 16

  lcd_command(0x21);

  lcd_command(0xC8);

  lcd_command(0x06);

  lcd_command(0x13);

  lcd_command(0x20);

  lcd_command(0x0C);

  _delay_ms(100);

  lcd_data(0x1F);

  lcd_data(0x1F);

  lcd_data(0x1F);

  while(1)

  {

  }

}

void lcd_command(unsigned char command)

{

  LCD_ENABLE;

  LCD_COMMAND;

  spi_putc(command);

  LCD_DISABLE;

}

void lcd_data(unsigned char data)

{

  LCD_ENABLE;

  LCD_DATA;

  spi_putc(data);

  LCD_DISABLE;

}

unsigned char spi_putc(unsigned char byte_in)

{

  SPDR = byte_in;

  while(!(SPSR & (1<<SPIF)));  //Wartet bis Byte gesendet wurde

  unsigned char byte_out = SPDR;

  return byte_out;

}