/************************************************************************
**    FUNCTION NAME   : Hibernate_init
**
**    DESCRIPTION     : Initialize the hibernation module.
**
**    ARGUMENTS       : None
**
**    RETURN TYPE     : None
**
***************************************************************************/

void Hibernate_init(void)
{
	uint32_t ui32Status = 0;

    Types_FreqHz cpuFreq;

    //Get the CPU clock frequency(120MHz) set in BIOS
    BIOS_getCpuFreq(&cpuFreq);
	
    //Extract the 32-bit frequency value
    ui32SysClock = cpuFreq.lo;

    // Enable the hibernate module.
    SysCtlPeripheralEnable(SYSCTL_PERIPH_HIBERNATE);

    // Initialize these variables before they are used.
    ui32Status = 0;

    // Check if Hibernation module is already active, which could mean
    // that the processor is waking from a hibernation.
    if(HibernateIsActive())
    {
    	// Read the status bits to see what caused the wake.  Clear the wake
    	// source so that the device can be put into hibernation again.
    	ui32Status = HibernateIntStatus(0);
    	HibernateIntClear(ui32Status);

    	// System console prints to see which caused wakeup.
    	System_printf("Wake Due To : \n");

       	// Wake was due to the External Wake pin.
    	else if(ui32Status & HIBERNATE_INT_PIN_WAKE)
    	{
    		System_printf(" Wakeup Pin\n");
    	}
    }

    // Configure Hibernate module clock(120MHz).
    HibernateEnableExpClk(ui32SysClock);

    // If the wake was not due to the above sources, then it was a system reset.
    if(!(ui32Status & (HIBERNATE_INT_PIN_WAKE)))
    {
    	// Configure the module clock source.
    	HibernateClockConfig(HIBERNATE_OSC_LOWDRIVE);
		
    	// Print that this was a system restart, not wake from hibernation.
    	System_printf(" System restart\n");
    }
    // Enable processor interrupts.
    IntMasterEnable();
}

/************************************************************************
**    FUNCTION NAME   : HandleHibernate
**
**    DESCRIPTION     : Function to put device into Hibernate mode
**
**    ARGUMENTS       : None
**
**    RETURN TYPE     : None
**
***************************************************************************/

void HandleHibernate()
{
	uint32_t ui32Status = 0;
	
	// Read and clear any status bits that might have been set since last clearing them.
	ui32Status = HibernateIntStatus(0);
	HibernateIntClear(ui32Status);

	// Configure wakeup pin for Hibernate wakeup source.
	HibernateWakeSet(HIBERNATE_WAKE_PIN);

	// Request Hibernation.
	HibernateRequest();

	// Wait for a while for hibernate to activate.  It should never get past this point.
	SysCtlDelay(100);
}