omap30_dspwdg_l3.c

来自「有关于USB的一些主机端驱动」· C语言 代码 · 共 83 行

//-------------------------------------------------------------------------------
//            TEXAS INSTRUMENTS INCORPORATED PROPRIETARY INFORMATION           
//                                                                             
//   Property of Texas Instruments 
//   For  Unrestricted  Internal  Use  Only 
//   Unauthorized reproduction and/or distribution is strictly prohibited.  
//   This product is protected under copyright law and trade secret law 
//   as an unpublished work.  
//   Created 2000, (C) Copyright 1999 Texas Instruments.  All rights reserved.
//
//-------------------------------------------------------------------------------
#include  "omap30_l3.h"

//-------------------------------------------------------------------------------
//
//  FUNCTIONS
//
//-------------------------------------------------------------------------------


//----------------------------------------------------------
// NAME        : DSPWDG_Disable
// DESCRIPTION : Writting a predefined sequence
//               0xF5 followed by 0xA0 in the 8 lsb bits
//               to disable the watchdog
// PARAMETERS  : None
// RETURN VALUE: IS_OK if the watchdog has stopped 
//               NOT_OK if not
// ----------------------------------------------------------

UWORD16 DSPWDG_Disable(void)
{
   DSPWDG_TIMER_MODE = 0xF5;
   DSPWDG_TIMER_MODE = 0xA0;

   if (TestBitIndex(DSPWDG_TIMER_MODE, DSPWDG_TIMER_MODE_WATCHDOG_POS))
     {
       return(NOT_OK);
     }
   else
     {
       return(IS_OK);
     }
}


//----------------------------------------------------------
// NAME        : DSPWDG_Enable
// DESCRIPTION : Set the wdg timer in Watchdog mode
//                                                     
// PARAMETERS  : None                                 
// RETURN VALUE: IS_OK if the watchdog run  
//               NOT_OK if not      
// ----------------------------------------------------------

UWORD16 DSPWDG_Enable(void)
{
   SetBitIndex(DSPWDG_TIMER_MODE, DSPWDG_TIMER_MODE_WATCHDOG_POS);

   if (TestBitIndex(DSPWDG_TIMER_MODE, DSPWDG_TIMER_MODE_WATCHDOG_POS))
     {
       return(IS_OK);
     }
   else
     {
       return(NOT_OK);
     }
}

//----------------------------------------------------------
// NAME        : DSPWDG_Refresh
// DESCRIPTION : Load a value in the watchdog to avoid a watchdog reset
//                                                     
// PARAMETERS  :
//   CounterValue = Timer setup value to be loaded                                 
// RETURN VALUE: None
// ----------------------------------------------------------

void DSPWDG_Refresh(UWORD16 CounterValue)
{
   DSPWDG_LOAD_TIMER = CounterValue;
}