spi_test.c

AVR ATmega48 SPI最簡單測試碼！ 透過spi_data[x]陣列寫入想要傳送的資料

#include <avr/io.h>
#include <avr/iom48.h>
#include <avr/interrupt.h>

unsigned char spi_data[6]={0xd0,0x01,0x42,0x80,0x8C,0x00};
unsigned char x;
int gg=0;
ISR(SPI_STC_vect)
{
	//asm("nop");
	if(x==1||x==3)
	{
		PORTB|=0x04;
		for(gg=0;gg<=1;gg++)
		asm("nop");
	}
	x++;
	if(x>3)
	{
		x=0;
	}
}

void spi_init()
{
	SPCR=0xD6;
	SPSR=0x01;
}

void main()
{
	
	//PORTC=0x01;
	DDRB=0x2C;
	PORTB=0x2C;
	x=0;
	spi_init();
	sei();
	while(1)
	{
		
		PORTB&=0xFB;
		asm("nop");
		SPDR=spi_data[x];
		//while((SPSR&0x80));
		
	}
	
}