?? putchar.c
字號:
/***********************************************************************/
/* This file is part of the C51 Compiler package */
/* Copyright KEIL ELEKTRONIK GmbH 1990 - 1999 */
/***********************************************************************/
/* */
/* PUTCHAR.C: This routine is the general character output of C51. */
/* */
/* To translate this file use C51 with the following invocation: */
/* */
/* C51 PUTCHAR.C <memory model> */
/* */
/* To link the modified PUTCHAR.OBJ file to your application use the */
/* following L51 invocation: */
/* */
/* L51 <your object file list>, PUTCHAR.OBJ <controls> */
/* */
/***********************************************************************/
#include <reg51.h>
#define XON 0x11
#define XOFF 0x13
char putchar (char c) {
if (c == '\n') {
if (RI) {
if (SBUF == XOFF) {
do {
RI = 0;
while (!RI);
}
while (SBUF != XON);
RI = 0;
}
}
while (!TI);
TI = 0;
SBUF = 0x0d; /* output CR */
}
if (RI) {
if (SBUF == XOFF) {
do {
RI = 0;
while (!RI);
}
while (SBUF != XON);
RI = 0;
}
}
while (!TI);
TI = 0;
return (SBUF = c);
}
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