// Copyright 2006 Yamane Akira
//ICC-AVR application builder : 2005/07/15 0:20:24
// Target : M8
// Crystal: 4.0000Mhz
// SPI Sample Program for Master
// Master Transmit Data from 0 to 7 on MOSI
// Also, Receive Data from Slave(MISO).
// Received Data is outputted to PORTD.
// Programmed by Akira Yamane

#include <iom8v.h>
#include <macros.h>

void port_init(void)
{
 PORTB = 0xFF;
 DDRB  = 0x2C; //  Set output with SCK, MOSI, SS
 PORTC = 0x00; 
 DDRC  = 0x00;
 PORTD = 0xFF;
 DDRD  = 0xFF;
}

//SPI initialize
// clock rate: 1000000hz
void spi_init(void)
{
 SPCR = 0x50; // (1 << SPE) | (1 << MSTR);
 SPSR = 0x00; // Set SCLK to fOSC/4.
}

//call this routine to initialize all peripherals
void init_devices(void)
{
 //stop errant interrupts until set up
 CLI(); //disable all interrupts
 port_init();
 spi_init();

 MCUCR = 0x00;
 GICR  = 0x00;
 TIMSK = 0x00; //timer interrupt sources
// SEI(); //re-enable interrupts
 //all peripherals are now initialized
}

unsigned char SPImaTx(unsigned char tdata)
  {
   SPDR = tdata;
     while(!(SPSR & (1<<SPIF))) ;   // wait SPIF is set
   return SPDR;
  }

// Software Timer  
void delay()
  {
   unsigned char a,b;
     for (a = 1; a; a++)
	   for (b = 1; b; b++)
	     ;
  }	 
 
//
void main(void)
{
 unsigned char i;
 init_devices();
 
   while(1)
     {
	   for (i = 0; i < 8; i++)
	      {
             PORTB &= ~0x04;  // SS set to Active
		  PORTD = SPImaTx(i);
             PORTB |= 0x04;   // SS set inactive
		   delay();
		  }

	 }
}