/*
	debugprint.c
	UART初始化標(biāo)準(zhǔn)I/O
	
	外部4MHz晶振
	
	芯藝 2004-09-11
*/


#include <avr/io.h>

#include <stdio.h>

//uart寫一字節(jié)數(shù)據(jù)
int usart_putchar(char c)
{
	if(c=='\n')
		usart_putchar('\r');
	loop_until_bit_is_set(UCSRA,UDRE);
	UDR=c;
	return 0;
}
//uart讀一字節(jié)數(shù)據(jù)
int usart_getchar(void)
{
	loop_until_bit_is_set(UCSRA,RXC);
	return UDR;
}

void IoInit(void)
{
	//初始化uart
	UCSRB=_BV(RXEN)|_BV(TXEN);/*(1<<RXCIE)|(1<<TXCIE)|*/
	UBRRL=25;	//9600 baud 6MHz:38  4MHz:25	
	
	//打開標(biāo)準(zhǔn)I/O流
	fdevopen(usart_putchar,usart_getchar,0);	
}