serial.c

这个是我将UCOS移植到LPC系列的基本模版,大家可以下载下来参考下,和ZLG的完全不一样,并不是采用软中断实现任务切换,更加稳定.如果有问题可以[e-mail]

/******************************************************************************/
/* SERIAL.C: Low Level Serial Routines                                        */
/******************************************************************************/
/* This file is part of the uVision/ARM development tools.                    */
/* Copyright (c) 2005-2006 Keil Software. All rights reserved.                */
/* This software may only be used under the terms of a valid, current,        */
/* end user licence from KEIL for a compatible version of KEIL software       */
/* development tools. Nothing else gives you the right to use this software.  */
/******************************************************************************/

#include <LPC22xx.H>                     /* LPC22xx definitions               */
#define CR     0x0D

#include <stdarg.h> 





/* implementation of putchar (also used by printf function to output data)    */

int sendchar (int ch)  {                 /* Write character to Serial Port    */

  if (ch == '\n')  {
    while (!(U0LSR & 0x20));
    U0THR = CR;                          /* output CR */
  }
  while (!(U0LSR & 0x20));
  return (U0THR = ch);
}



int getkey (void)  {                     /* Read character from Serial Port   */

  while (!(U0LSR & 0x01));

  return (U0RBR);
}