Problem mit PIC18 als Slave: Werde Daten nicht gesendet?

void initI2C(void)

{

    //set I2C  

    i2c_send_index = 0;

    SSPADD = SLAVE_POWERBOX;     // set slave address

    //SSPMSK = 0xFF;     // Only respond to my address ( All bits must match)

    SSPCON1bits.SSPM = 0b0110;  //I2C Slave mode, 7-bit address

    SSPCON1bits.CKP = 1;  //Release clock

    SSPCON1bits.SSPEN = 1;      // Enables I2C

    SSPSTATbits.SMP = 1;        //standard Speed mode

    SSPSTATbits.CKE = 0;        //Disable SMBus specific inputs

    SSPCON2bits.GCEN = 0;       //General call address disabled

    SSPCON2bits.SEN = 1;        //Clock stretching is enabled

    //Interrupt for I2C    

 //   IPR1bits.SSPIP = 1;         // Set SSP interrupt priority to high

    PIR1bits.SSPIF = 0;         // Clear interrupt flag

  //  PIE1bits.SSPIE = 1;         // Enable SSP interrupt

}

    while(1)

    {

        if (PIR1bits.SSPIF)

        {

        temp = SSPSTAT & 0b00101101; // Mask out unimportant bits in SSPSTAT 

        switch (temp)

        {

        // State 3: Read operation, last byte was an address, buffer is full.

        // SSPSTAT bits: S = 1, D_A = 0, R_W = 1, BF = 1

        // Start new read sequence

        case ( 0b00001101 ):

            temp2 = SSPBUF;      // Do a dummy read of SSPBUF -> BF is cleared

            i2c_send_index = 0; //reset index counter

            //+++++++++++++++++++++++++++++++++++++++++++++

            //WARUM IST DIESE BEDINGUNG UNWAHR? SOLLTE DOCH DIE ADRESSE DES SLAVES SEIN???????

            if (temp2 != SLAVE_POWERBOX) 

            {

                LED1 = LED_ON;               

             //   break;

            }

            LED2 ^= 1;

            do

            {

                SSPCON1bits.WCOL = 0;   // Clear WCOL flag

                SSPBUF = SLAVE_POWERBOX;//writeData[i2c_send_index];   // Write the data to the buffer

            }

            while ( SSPCON1bits.WCOL );  // Loop when there's a write collision

            i2c_send_index++;       //next Data Byte

            break;

        // State 4: Read operation, last byte was data, buffer is empty.

        // SSPSTAT bits: S = 1, D_A = 1, R_W = 1, BF = 0

        // continue sending

        case ( 0b00101100 ):

            do

            {

                SSPCON1bits.WCOL = 0;   // Clear WCOL flag

                SSPBUF = writeData[i2c_send_index];   // Write the data to the buffer

            }

            while ( SSPCON1bits.WCOL );  // Loop when there's a write collision

            i2c_send_index++;       //next Data Byte

            break;

        default:

            break;

     }

    i2c_send_index %= sizeof(writeData);

    SSPCON1bits.CKP = 1;    //Release Clock

    PIR1bits.SSPIF = 0;

    }

 }