dspwdg.c

以TI 公司的OMAP5910为例

//////////////////////////////////////////////////////////////////////////
//            Copyright (C) 2004, Eyoka @ Microunit
//                           All Rights Reserved
//________________________________________________________________________
//
// FILENAME:    dspwdg.c
// PROJECT:     High-Resolution Video System On OMAP
// MODULE:      DSP System
// DESCRIPTION: DSP Watchdog support.
// TARGET CPU:  DSP-C55xx of OMAP5910
// VERSION:     1.0
//________________________________________________________________________
//
// REVISE HISTORY
// DATE         VERSION AUTHOR  DESCRIPTION
// 2004-10-13   1.0     Eyoka   First release.
//////////////////////////////////////////////////////////////////////////

#include"dspwdg.h"


/////////////////////////////////////////////////////////////////////
// FUNCTIONS
/////////////////////////////////////////////////////////////////////

//___________________________________________________________________
// Function: WDG_Disable
// Usage: disable the watchdog
// Parameters:
//    N/A
// Return Values:
//    BOOL		TRUE if the watchdog has stopped; FALSE if not
//___________________________________________________________________
//
BOOL WDG_Disable()
{
	// Write a predefined sequence(0xF5 followed by 0xA0) in bits7-0
	WDG_TIMER_MODE = 0x00F5;
	WDG_TIMER_MODE = 0x00A0;

	// check WATCHDOG bit in TIMER_MODE
	if(WDG_TIMER_MODE & 0x1000)
	{
		// Watchdog is still running
		return FALSE;
	}
	else
	{
		// Watchdog is stopped
		return TRUE;
	}
}

//___________________________________________________________________
// Function: WDG_Enable
// Usage: enable the watchdog
// Parameters:
//    N/A
// Return Values:
//    BOOL		TRUE if the watchdog has been enabled; FALSE if not
//___________________________________________________________________
// untested
BOOL WDG_Enable()
{
	// set WATCHDOG bit in TIMER_MODE
	WDG_TIMER_MODE |= 0x1000;

	// check WATCHDOG bit in TIMER_MODE
	if(WDG_TIMER_MODE & 0x1000)
	{
		// Watchdog is enabled
		return TRUE;
	}
	else
	{
		// Watchdog is still disabled
		return FALSE;
	}
}

//___________________________________________________________________
// Function: WDG_Refresh
// Usage: load a value in the watchdog to avoid a watchdog reset
// Parameters:
//    CounterValue		- Timer setup value to be loaded
// Return Values:
//    N/A
//___________________________________________________________________
// untested
void WDG_Refresh(WORD CounterValue)
{
	WDG_LOAD_TIM = CounterValue;
}


// the end
//////////////////////////////////////////////////////////////////////////