Graphicstest where do you assign SPI pins?

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Here is my C code for a 16bit SPI interface on an Atmel ATMega8 processor. This is not using the Arduino system. SPI is not that hard!

#define VCA_DATA     2  // PORT D1
#define VCA_CLK        4  // PORT D2
#define VCA_CS         32  // PORT C5


vca_out(unsigned char n)  // n = 8bit value to send
{
    unsigned int q,r;

     r= ((n << 8) + n);  // both channels same
     PORTC &= ~(32);  // vca chip select
     for (q= 0x8000; q>= 1; q/= 2)  {
          if (r & q)
              PORTD |= (VCA_DATA);
          else
              PORTD &= ~(VCA_DATA);
          PORTD |= (VCA_CLK);
          PORTD &= ~(VCA_CLK);
        }
       PORTC |= 32;  // vca chip unselect
return;
}