tuerschl.c

#include <avr/io.h>

#include "spi_via_usi_driver.h"

#define SPIMODE 0  // Sample on leading _rising_ edge, setup on trailing _falling_ edge.

int main()

{

  unsigned char val = 0;    // Temp value to send.

  DDRB = 0xFF;      // Set PORTB to all output.

  spiX_initmaster(SPI_MODE_RISING);  // Init SPI driver as master.

  sei();    // Must do this to make driver work.

  do {

    spiX_put( val++ );  // Send temp value to SPI and increment,

    spiX_wait();    // wait for transmission to finish

    PORTB = spiX_get();  // and finally put result on PORTB.

  } while(1);      // Loop forever...

}