wdt.cpp

湖北水文黄石试点集中器代码

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Copyright (C), 2005, Emtronix Tech. Co., Ltd.
* File name:       RS232X3.CPP
* Module name:     ETR232i模块的看门狗系列函数
* Author/Date:     Emtronix  06/02/14 
* Version:         Ver 1.0
* Description:     ETR232i模块的看门狗系列函数的.CPP文件
* Others:          如有改动，请在下面的历史记录登记，谢谢合作!

------------------History-----------------------------
* Modifier/Date:    //修订人及修订日期
* Modify Reason:    //修订原因
* Modification:     //修订的内容和位置的简要说明
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* Modifier/Date:    //修订人及修订日期
* Modify Reason:    //修订原因
* Modification:     //修订的内容和位置的简要说明
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* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
#include <stdio.h>
#include <dos.h>
#include <time.h>
#include "etr232i.h"

#define INTR 0x1c

#ifdef __cplusplus
    #define __CPPARGS ...
#else
    #define __CPPARGS
#endif

void interrupt (*oldhandler)(__CPPARGS);
void interrupt newhandler( __CPPARGS );

unsigned int WDTLongCnt=0;
unsigned int MaxWDTLongCnt=0;

int SetWDTLong( float seconds )
{
   if( seconds > 300.0 )    seconds = 300.0;
   if( seconds < 2.0   )    seconds = 2.0;

   MaxWDTLongCnt = (seconds-1.3)*CLK_TCK;
   SetWDT( 26 );
   asm cli
   oldhandler = getvect(INTR);
   setvect(INTR, newhandler);
   asm sti

   return 0;
}

int Release( )
{
   asm cli
   setvect(INTR, oldhandler);
   asm sti
   return 0;
}

int ReloadWDTLong( )
{
   WDTLongCnt = 0;
   return 0;
}

void interrupt newhandler( __CPPARGS )
{
   WDTLongCnt++;
   if( WDTLongCnt<MaxWDTLongCnt )
      ReloadWDT( );
}