MFRC522 Probleme bei Ansteuerung

[Johannes (Gast)]

Hallo liebe leut,

ich versuche gerade einen RFID reader (mfrc522) zum laufen zu bringen.
Doch dabei habe ich Probleme (evtl. beim SPI)

MFRC -> Arduino Uno -> ATmega328
SDA -> Pin10 -> PB2
SCK -> PIN13 -> PB5
MOSI -> PIN11 -> PB3
MISO -> PIN12 -> PB4
IRQ -> nicht angeschlossen
RST -> PIN9 -> PB1
GND -> GND 
3.3V -> 3.3V

main.c

int main(void)
{
    sei();
    uart_init(MYUBRR);
    spi_initMaster();
    uart_putstring("start action\n");
    char mfrc522Info[100];
    mfrc522_init();
    uart_putstring("lese dumpVersion...\r\n");
    (void)mfrc522_getDumpVersionData(mfrc522Info);
    uart_putstring(mfrc522Info);
    while (1) 
    {
        _delay_ms(1000);
        uart_putstring("blabla\n");
    }
}

void mfrc522_init(void)
{
    DDRB |= (1 << PINB2);    /* Set the chipSelectPin as digital output */
    
    uart_putstring("0\n");
    mfrc522_writeRegister(MFRC522_COMMAND_REG, MFRC522_SOFT_RESET);
    uint8_t count_u8 = 0;
    uint8_t tempVal_u8 = 0;
    do
    {
        _delay_ms(50);
        mfrc522_readRegister(MFRC522_COMMAND_REG, &tempVal_u8);
    }while((tempVal_u8 & (1 << 4)) && (++count_u8 < 3));
    uart_putstring("ios\n")
}


static uint8_t mfrc522_writeRegister(uint8_t reg, uint8_t value)
{
    uint8_t retVal_u8 = 1;;
    DDRB &= ~(1 << PINB2);
    uart_putstring("1\n");
    retVal_u8 = spi_transmitData(reg);
    uart_putstring("2\n");
    retVal_u8 = spi_transmitData(value);
    uart_putstring("3\n");
    DDRB |= (1 << PINB2);
    return retVal_u8;
}

uint8_t spi_transmitData(uint8_t byte)
{
    /* start transmission */
    SPDR = byte;

    uart_putstring("before while transmit\n");
    /* wait for transission complete */
    while(!(SPSR & (1 << SPIF)));
    
    uart_putstring("after while transmit\n");

    //return SPDR;
    return 1;
}

Mein Output wie folgt aus: (benutze HTerm für UART)

start action
0
1
before while transmit
after while transmit
2
before while transmit

Dann bekomme ich keine Nachrichten mehr am PC.