/*
 * GccApplication1.c
 *
 * Author : admin
 */

#include <string.h>

#define  F_CPU     16000000

#include <avr/io.h>
#include <util/delay.h>

#define  CS_BIT    0x10
#define  CS_LOW    PORTA_OUTCLR = CS_BIT;
#define  CS_HIGH   PORTA_OUTSET = CS_BIT;


void spi_init (void)
{
  // Fleissaufgabe
}


uint8_t spi_xfer (uint8_t val)
{
  SPI0_DATA = val;
  while ( (SPI0_INTFLAGS & SPI_RXCIE_bm) == 0 )
  {
    // wait
  };
  return SPI0_DATA;
}


void spi_write (uint8_t *buff, uint8_t count)
{
  CS_LOW;
  while ( count != 0 )
  {
    spi_xfer (*buff);
    buff++;
    count--;
  };
  CS_HIGH;
}


void spi_read (uint8_t *buff, uint8_t count)
{
  CS_LOW;
  while ( count != 0 )
  {
    *buff = spi_xfer (0);
    buff++;
    count--;
  };
  CS_HIGH;
}


int main (void)
{
  char  mybuff[] = "Hello world .....\r\n";
  uint8_t  ll;

  spi_init ();

    while (1)
    {
    ll = strlen (mybuff);
    spi_write ((uint8_t*)&mybuff, ll);
    _delay_ms(100);
    }
}