//包含所需頭文件
#include <ioM16v.h>
#include <macros.h>




/*------宏定義------*/
#define uchar	unsigned char
#define uint	unsigned int

uchar k=1;

/*------函數定義------*/
//SPI函數
void spi_write(uchar sData);
uchar spi_read(void);

void delay(uint z)
{
 uint i,j;
 for(i=0;i<z;i++)
  for(j=0;j<1000;j++);
}


//端口初始化
void port_init(void)
{
 PORTA = 0x00;
 DDRA  = 0x00;
 PORTB = 0x00;
 DDRB  = 0x00;
 PORTC = 0x00;
 DDRC  = 0x00;
 PORTD = 0x00;
 DDRD  = 0x00;
}


void spi_init(void)
{
 //spi初始化
 PORTB |= (1<<PB4) | (1<<PB5) | (1<<PB6) | (1<<PB7); 
 DDRB|=BIT(PB7)|BIT(PB5)|BIT(PB4);
 SPCR = 0x50;
 SPSR = 0x00;
}


//功能:使用SPI發(fā)送一個字節(jié)
void spi_write(uchar sData)
{
 
 SPDR = sData;
 while(!(SPSR & BIT(SPIF)));
 //sData=SPDR;//讀從機發(fā)回來的數據
}


//功能:使用SPI接收一個字節(jié)
uchar spi_read(void)
{
 SPDR = 0x00;
 while(!(SPSR & BIT(SPIF)));
 return SPDR;
}


void init_devices(void)
{
 CLI(); //禁止所有中斷
 MCUCR  = 0x00;
 MCUCSR = 0x80;//禁止JTAG
 GICR   = 0x00;
 port_init();
 spi_init();
 SEI();//開全局中斷
}
//主函數
void main(void)
{
 uint a=1000;
 init_devices();
 //在這繼續(xù)添加你的代碼 
 do{
  PORTB&=~BIT(PB4);
  spi_write(k*25);
  PORTB|=BIT(PB4);
  delay(100);
  k++;
  } 
 while(!(spi_read()==255)); 
 while(1)
 {
  ;
 }
}