main.c

GCC-AVR application builder : 2007-8-31 18:00:11 Target : M16 Crystal: 7.3728Mhz 作者：小马哈 功能：SP

//ICC-AVR application builder : 2008-6-16 18:47:52
// Target : M16
// Crystal: 16.000Mhz

//#define MASTER
#include <iom16v.h>
#include <macros.h>
#include "delay.h"

#ifdef MASTER
	#warning "build as MASTER SPI"
#else
	#warning "build as SLAVE SPI"
#endif
void port_init(void)
{
 	PORTA = 0xff;
 	DDRA  = 0xff;
 	PORTB = 0x00;
 	DDRB  = 0x00;
 	PORTC = 0x00; //m103 output only
 	DDRC  = 0x00;
 	PORTD = 0x00;
 	DDRD  = 0x00;
}

//SPI initialize
// clock rate: 1000000hz
void spi_init(void)
{
	#ifdef MASTER
 		SPCR = 0x51; //setup SPI Master
	#else
 		SPCR = 0x41|0x80; //setup SPI Slave
	#endif
 	SPSR = 0x00; //setup SPI
}

//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
}

#pragma interrupt_handler SPI_RXC_ISR:18 
void SPI_RXC_ISR(void) 
{ 
  	//unsigned char data_temp; 
  	//SPDR=0xab; 
  	//data_temp=SPDR; 
	#ifdef MASTER
	#else
		PORTA=SPDR;
	#endif
} 
//
void main(void)
{
	unsigned char n=0;
 	init_devices();
 	//insert your functional code here...
	#ifdef MASTER
		DDRB|=0x10;
		PORTB|=0x10;
	#else
		PORTB|=0x10;
	#endif
	while(1)
	{
		n++;
		#ifdef MASTER
			PORTB&=0xef;
			SPDR=n;
			/* 启动数据传输 */

			/* 等待传输结束 */
			while(!(SPSR & (1<<SPIF)));
			PORTB|=0x10;
		#else
			//PORTA=~n;
		#endif
		delay_nms(200);
	}
}