USI_SPI_IAR.c

/* Test application for the SPI-via-USI-driver. */

//#include "SPI_treiber.c"

#include <avr/io.h>

#include <avr/interrupt.h>

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

//#define SPIMODE 1  // Sample on leading _falling_ edge, setup on trailing _rising_ edge.

unsigned char output;

void main()

{

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

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

//  spiX_initslave(SPIMODE);  // Init SPI driver as slave.

  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

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

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

}