usart.c

PIC单片机模拟串口 11.0592时钟 支持2400波特及以下稳定收发 一位起始

#include <pic.h>
#include <stdio.h>
#include "usart.h"

void 
putch(unsigned char byte) 
{
	/* output one byte */
	while(!TXIF)	/* set when register is empty */
		continue;
	TXREG = byte;
}

unsigned char 
getch() {
	/* retrieve one byte */
	while(!RCIF)	/* set when register is not empty */
		continue;
	return RCREG;	
}

unsigned char
getche(void)
{
	unsigned char c;
	putch(c = getch());
	return c;
}