PIC SPI Master Slave

                CS = 0; // Begin

    SSPBUF = 0x33;

    while (!SSPSTATbits.BF); // Wait until receive buffer full

    receive = SSPBUF; // Copy data to variable

    CS = 1; // End

    while (1)

    {

      if(SSPSTATbits.BF) // 

      {

        receive = SSPBUF;  /a

              SSPBUF = dummy; // Send ok back (0x99) 

      }

        if (SSPCON1bits.WCOL)

      {

        SSPCON1bits.WCOL = 0;

      }

      if (SSPCON1bits.SSPOV)

      {

        SSPCON1bits.SSPOV = 0;

      }

    }