请教lpc936看门狗配置

只看该作者 · 2010-1-4 00:11

看门狗的初始化、启动、喂狗函数已经写好，已经加入到主程序中具体请见最后代码。
碰到的情况是在minipro 编程器里选中WDT使能，lpc936就无法运行起来。
禁止WDT功能，lpc936就能正常运行（当然没有看门狗功能）。
请问该怎么调整，谢谢。
/***********************************************************************
MODULE: Watchdog
VERSION: 1.01
CONTAINS:  Routines for controlling the Watchdog on the
         P89LPC922
COPYRIGHT: Embedded Systems Academy, Inc. - www.esacademy.com
LICENSE: May be freely used in commercial and non-commercial code
         without royalties provided this copyright notice remains
         in this file and unaltered
WARNING: IF THIS FILE IS REGENERATED BY CODE ARCHITECT ANY CHANGES
         MADE WILL BE LOST. WHERE POSSIBLE USE ONLY CODE ARCHITECT
         TO CHANGE THE CONTENTS OF THIS FILE
GENERATED: On "May 25 2007" at "08:43:39" by Code Architect 2.11
***********************************************************************/
// SFR description needs to be included
#include <reg922.h>
// #include "watchdog.h"
/***********************************************************************
DESC: Initializes the watchdog as a Watchdog Timer
      Uses Watchdog clock at 400kHz as a clock source
      Resets the device if not fed within 998.888 ms
RETURNS: Nothing
************************************************************************/
void watchdog_init (void)
{
  bit eacopy;
  // init reload value and prescaler
  // select Watchdog clock at 400kHz
  // start watchdog
  WDL = 0xFF;
  eacopy = EA;
  EA = 0;
  WDCON = 0xC1;
  WFEED1 = 0xA5;
  WFEED2 = 0x5A;
  EA = eacopy;
}
/***********************************************************************
DESC: Feeds the Watchdog to stop the device from resetting
RETURNS: Nothing
CAUTION: watchdog_init must be called first
************************************************************************/
void watchdog_feed  (void)
{
  bit eacopy;
  // disable interrupts
  eacopy = EA;
  EA = 0;
  // feed the watchdog
  WFEED1 = 0xA5;
  WFEED2 = 0x5A;
  // restore interrupts
  EA = eacopy;
}
/***********************************************************************
DESC: Starts the Watchdog
RETURNS: Nothing
CAUTION: watchdog_init must be called first
************************************************************************/
void watchdog_start (void)
{
  bit eacopy;
  // disable interrupts
  eacopy = EA;
  EA = 0;
  // start the watchdog
  WDCON |= 0x04;
  // feed the watchdog
  WFEED1 = 0xA5;
  WFEED2 = 0x5A;
  // restore interrupts
  EA = eacopy;
}
/***********************************************************************
DESC: Stops the Watchdog
RETURNS: Nothing
CAUTION: watchdog_init must be called first
************************************************************************/
void watchdog_stop (void)
{
  bit eacopy;
  // disable interrupts
  eacopy = EA;
  EA = 0;
  // stop the watchdog
  WDCON &= ~0x04;
  // feed the watchdog
  WFEED1 = 0xA5;
  WFEED2 = 0x5A;
  // restore interrupts
  EA = eacopy;
}

只看该作者 · 2010-1-6 00:24

找了个参考
不用启动呀，初始化完就可以在主程中喂狗了，我没有做watchdog_start动作，不喂就重启。

我和你初始化WDCON有点不同，你查一下。

void init_wdt()
{
WDL = 0xff; //设置8位倒计时器初值
WDCON=0xE5;
WFEED1 = 0xA5; //清零第一部分
WFEED2 = 0x5A; //清零第二部分
}
void clrwdt() //喂狗
{
  EA = 0; //关闭中断
  WFEED1 = 0xA5; //执行清零第一部分
  WFEED2 = 0x5A; //执行清零第二部分
  EA = 1; //开中断
}

只看该作者 · 2010-1-6 18:50

楼上的例子不错，不过好像哪见过

请教lpc936看门狗配置

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