SPI problem bei CS Leitung

/* I/0 high-low Routinen */

#define CS_LOW    PORTB |= (1<<PINB0)  //set CS high

#define CS_HIGH    PORTB &=~ (1<<PINB0)  //set CS low

void spi_init()

{

/*SPI Pins initialisieren

PB0...CS  output

PB1...SCK  output

PB2...MOSI  output

PB3...MISO  input  

*/

DDRB &= ~(1<<PINB3);    // PortB Pin 3 (SPI MISO)   -> Eingang

DDRB |=  (1<<PINB1);    // PortB Pin 1 (SPI SCK)   -> Ausgang

DDRB |=  (1<<PINB2);    // PortB Pin 2 (SPI MOSI)   -> Ausgang

DDRB |=  (1<<PINB0);    // PortB Pin 0 (SPI CS)   -> Ausgang

CS_HIGH;

CS_LOW;

}