console-io.c

来自「RTEMS (Real-Time Executive for Multiproc」· C语言 代码 · 共 69 行

/*
 *  This file contains the hardware specific portions of the TTY driver
 *  for the serial ports on the erc32.
 *
 *  COPYRIGHT (c) 1989-1997.
 *  On-Line Applications Research Corporation (OAR).
 *
 *  The license and distribution terms for this file may be
 *  found in the file LICENSE in this distribution or at
 *  http://www.rtems.com/license/LICENSE.
 *
 *  $Id: console-io.c,v 1.3.4.1 2003/09/04 18:44:12 joel Exp $
 */

#include <bsp.h>
#include <rtems/libio.h>
#include <stdlib.h>
#include <assert.h>

/*
 *  console_initialize_hardware
 *
 *  This routine initializes the console hardware.
 *
 */

void console_initialize_hardware(void)
{
  return;
}

/*
 *  console_outbyte_polled
 *
 *  This routine transmits a character using polling.
 */

void console_outbyte_polled(
  int  port,
  char ch
)
{
  int status;
  int nwritten;

  status = _sys_write (1, &ch, 1, &nwritten);
}

/*
 *  console_inbyte_nonblocking 
 *
 *  This routine polls for a character.
 */

int console_inbyte_nonblocking(
  int port
)
{
  int status;
  int nread;
  char c;

  status = _sys_read (0, &c, 1, &nread);
  if ( status == 0 ) 
    return c;
  return -1;
}