Pin abfrage geht nicht

#define   F_CPU 1000000UL          // MP-Takt

#include  <avr/io.h>

#include  <stdio.h>

#include  <stdlib.h>

#include   <inttypes.h>

#include   <avr/interrupt.h>

#include   <avr/wdt.h>

#include    <util/delay.h>

#define BAUD     1200UL

#define UBRR_BAUD  ((F_CPU)/(16*(BAUD))-1)

int uart_putc(unsigned char c)

{

  while (!(UCSRA & (1<<UDRE)));

  UDR = c;

  return 0;

}

int uart_puts( char* str )

{

  while( *str )

    uart_putc( *str++ );

    while (!(UCSRA & (1<<UDRE)));

    UDR = 0x0A;

  return 0;

}

void long_delay(void);

int main(void)

{

// Eingang (Spalten)  

  DDRB  = 0x00;

  PORTB = 0x00;

// Ausgang (Zeilen)

  DDRC  = 0xFF;

  PORTC = 0xFF;

// RS232 aktivieren  

  UCSRB   |= (1 << TXEN) | ( 1 << RXEN ) | ( 1 << RXCIE ) ;          // UART TX, RX einschalten

   UCSRC   |= ( 1 << URSEL ) | ( 1<<UCSZ1 ) | ( 1<<UCSZ0);           // Asynchron 8N1,

    UBRRL  = (uint8_t) UBRR_BAUD;

  sei();   

  uart_puts("Start : ");

  while (1)

  {

    // Prüfe Zeile 1 ( 1 2 3)

    PORTC = (1<<PC2);

    if (PINB & (1<<PINB1))

    {

      _delay_ms(100);

      if (PINB & (1<<PINB1))

      {

        _delay_ms(100);

        if (PINB & (1<<PINB1))

        {

          uart_puts("  pressed");

        }

      }

    }

    else

    {

      uart_puts("not pressed");

    }

    long_delay();

    PORTC=0x00;

  }      

}

void long_delay(void)

{

       _delay_ms(200);

       _delay_ms(200);

       _delay_ms(200);

       _delay_ms(200);

}