hibernate.c

基于TI公司Cortex-M3的uart超级通信开发

            // Wait for write complete to be signaled on later devices.
            //
            HibernateWriteComplete();
        }
    }
}

//*****************************************************************************
//
//! Reads a set of data from the non-volatile memory of the Hibernation module.
//!
//! \param pulData points to a location where the data that is read from the
//! Hibernation module will be stored.
//! \param ulCount is the count of 32-bit words to read.
//!
//! Retrieves a set of data from the Hibernation module non-volatile memory
//! that was previously stored with the HibernateDataSet() function.  The
//! caller must ensure that \e pulData points to a large enough memory block to
//! hold all the data that is read from the non-volatile memory.
//!
//! \return None.
//
//*****************************************************************************
void
HibernateDataGet(unsigned long *pulData, unsigned long ulCount)
{
    unsigned int uIdx;

    //
    // Check the arguments.
    //
    ASSERT(ulCount <= 64);
    ASSERT(pulData != 0);

    //
    // Loop through all the words to be restored, reading one at a time.
    //
    for(uIdx = 0; uIdx < ulCount; uIdx++)
    {
        //
        // Read a word from the non-volatile storage area.  No delay is
        // required between reads.
        //
        pulData[uIdx] = HWREG(HIB_DATA + (uIdx * 4));
    }
}

//*****************************************************************************
//
//! Requests hibernation mode.
//!
//! This function requests the Hibernation module to disable the external
//! regulator, thus removing power from the processor and all peripherals.  The
//! Hibernation module will remain powered from the battery or auxiliary power
//! supply.
//!
//! The Hibernation module will re-enable the external regulator when one of
//! the configured wake conditions occurs (such as RTC match or external
//! \b WAKE pin).  When the power is restored the processor will go through a
//! normal power-on reset.  The processor can retrieve saved state information
//! with the HibernateDataGet() function.  Prior to calling the function to
//! request hibernation mode, the conditions for waking must have already been
//! set by using the HibernateWakeSet() function.
//!
//! Note that this function may return because some time may elapse before the
//! power is actually removed, or it may not be removed at all.  For this
//! reason, the processor will continue to execute instructions for some time
//! and the caller should be prepared for this function to return.  There are
//! various reasons why the power may not be removed.  For example, if the
//! HibernateLowBatSet() function was used to configure an abort if low
//! battery is detected, then the power will not be removed if the battery
//! voltage is too low.  There may be other reasons, related to the external
//! circuit design, that a request for hibernation may not actually occur.
//!
//! For all these reasons, the caller must be prepared for this function to
//! return.  The simplest way to handle it is to just enter an infinite loop
//! and wait for the power to be removed.
//!
//! \return None.
//
//*****************************************************************************
void
HibernateRequest(void)
{
    //
    // Set the bit in the control register to cut main power to the processor.
    //
    HWREG(HIB_CTL) |= HIB_CTL_HIBREQ;
}

//*****************************************************************************
//
//! Enables interrupts for the Hibernation module.
//!
//! \param ulIntFlags is the bit mask of the interrupts to be enabled.
//!
//! Enables the specified interrupt sources from the Hibernation module.
//!
//! The \e ulIntFlags parameter must be the logical OR of any combination of
//! the following:
//!
//! - \b HIBERNATE_INT_PIN_WAKE - wake from pin interrupt
//! - \b HIBERNATE_INT_LOW_BAT - low battery interrupt
//! - \b HIBERNATE_INT_RTC_MATCH_0 - RTC match 0 interrupt
//! - \b HIBERNATE_INT_RTC_MATCH_1 - RTC match 1 interrupt
//!
//! \return None.
//
//*****************************************************************************
void
HibernateIntEnable(unsigned long ulIntFlags)
{
    //
    // Check the arguments.
    //
    ASSERT(!(ulIntFlags & ~(HIBERNATE_INT_PIN_WAKE | HIBERNATE_INT_LOW_BAT |
                            HIBERNATE_INT_RTC_MATCH_0 |
                            HIBERNATE_INT_RTC_MATCH_1)));

    //
    // Set the specified interrupt mask bits.
    //
    HWREG(HIB_IM) |= ulIntFlags;
}

//*****************************************************************************
//
//! Disables interrupts for the Hibernation module.
//!
//! \param ulIntFlags is the bit mask of the interrupts to be disabled.
//!
//! Disables the specified interrupt sources from the Hibernation module.
//!
//! The \e ulIntFlags parameter has the same definition as the \e ulIntFlags
//! parameter to the HibernateIntEnable() function.
//!
//! \return None.
//
//*****************************************************************************
void
HibernateIntDisable(unsigned long ulIntFlags)
{
    //
    // Check the arguments.
    //
    ASSERT(!(ulIntFlags & ~(HIBERNATE_INT_PIN_WAKE | HIBERNATE_INT_LOW_BAT |
                            HIBERNATE_INT_RTC_MATCH_0 |
                            HIBERNATE_INT_RTC_MATCH_1)));

    //
    // Clear the specified interrupt mask bits.
    //
    HWREG(HIB_IM) &= ~ulIntFlags;
}

//*****************************************************************************
//
//! Registers an interrupt handler for the Hibernation module interrupt.
//!
//! \param pfnHandler points to the function to be called when a hibernation
//! interrupt occurs.
//!
//! Registers the interrupt handler in the system interrupt controller.  The
//! interrupt is enabled at the global level, but individual interrupt sources
//! must still be enabled with a call to HibernateIntEnable().
//!
//! \sa IntRegister() for important information about registering interrupt
//! handlers.
//!
//! \return None.
//
//*****************************************************************************
void
HibernateIntRegister(void (*pfnHandler)(void))
{
    //
    // Register the interrupt handler.
    //
    IntRegister(INT_HIBERNATE, pfnHandler);

    //
    // Enable the hibernate module interrupt.
    //
    IntEnable(INT_HIBERNATE);
}

//*****************************************************************************
//
//! Unregisters an interrupt handler for the Hibernation module interrupt.
//!
//! Unregisters the interrupt handler in the system interrupt controller.  The
//! interrupt is disabled at the global level, and the interrupt handler will
//! no longer be called.
//!
//! \sa IntRegister() for important information about registering interrupt
//! handlers.
//!
//! \return None.
//
//*****************************************************************************
void
HibernateIntUnregister(void)
{
    //
    // Disable the hibernate interrupt.
    //
    IntDisable(INT_HIBERNATE);

    //
    // Unregister the interrupt handler.
    //
    IntUnregister(INT_HIBERNATE);
}

//*****************************************************************************
//
//! Gets the current interrupt status of the Hibernation module.
//!
//! \param bMasked is false to retrieve the raw interrupt status, and true to
//! retrieve the masked interrupt status.
//!
//! Returns the interrupt status of the Hibernation module.  The caller can use
//! this to determine the cause of a hibernation interrupt.  Either the masked
//! or raw interrupt status can be returned.
//!
//! \return Returns the interrupt status as a bit field with the values as
//! described in the HibernateIntEnable() function.
//
//*****************************************************************************
unsigned long
HibernateIntStatus(tBoolean bMasked)
{
    //
    // Read and return the Hibernation module raw or masked interrupt status.
    //
    if(bMasked == true)
    {
        return(HWREG(HIB_MIS) & 0xf);
    }
    else
    {
        return(HWREG(HIB_RIS) & 0xf);
    }
}

//*****************************************************************************
//
//! Clears pending interrupts from the Hibernation module.
//!
//! \param ulIntFlags is the bit mask of the interrupts to be cleared.
//!
//! Clears the specified interrupt sources.  This must be done from within the
//! interrupt handler or else the handler will be called again upon exit.
//!
//! The \e ulIntFlags parameter has the same definition as the \e ulIntFlags
//! parameter to the HibernateIntEnable() function.
//!
//! \note Since there is a write buffer in the Cortex-M3 processor, it may take
//! several clock cycles before the interrupt source is actually cleared.
//! Therefore, it is recommended that the interrupt source be cleared early in
//! the interrupt handler (as opposed to the very last action) to avoid
//! returning from the interrupt handler before the interrupt source is
//! actually cleared.  Failure to do so may result in the interrupt handler
//! being immediately reentered (since NVIC still sees the interrupt source
//! asserted).
//!
//! \return None.
//
//*****************************************************************************
void
HibernateIntClear(unsigned long ulIntFlags)
{
    //
    // Check the arguments.
    //
    ASSERT(!(ulIntFlags & ~(HIBERNATE_INT_PIN_WAKE | HIBERNATE_INT_LOW_BAT |
                            HIBERNATE_INT_RTC_MATCH_0 |
                            HIBERNATE_INT_RTC_MATCH_1)));

    //
    // Write the specified interrupt bits into the interrupt clear register.
    //
    HWREG(HIB_IC) |= ulIntFlags;
}

//*****************************************************************************
//
//! Checks to see if the Hibernation module is already powered up.
//!
//! This function queries the control register to determine if the module is
//! already active.  This function can be called at a power-on reset to help
//! determine if the reset is due to a wake from hibernation or a cold start.
//! If the Hibernation module is already active, then it does not need to be
//! re-enabled and its status can be queried immediately.
//!
//! The software application should also use the HibernateIntStatus() function
//! to read the raw interrupt status to determine the cause of the wake.  The
//! HibernateDataGet() function can be used to restore state.  These
//! combinations of functions can be used by the software to determine if the
//! processor is waking from hibernation and the appropriate action to take as
//! a result.
//!
//! \return Returns \b true if the module is already active, and \b false if
//! not.
//
//*****************************************************************************
unsigned int
HibernateIsActive(void)
{
    //
    // Read the control register, and return true if the module is enabled.
    //
    return(HWREG(HIB_CTL) & HIB_CTL_CLK32EN ? 1 : 0);
}

//*****************************************************************************
//
// Close the Doxygen group.
//! @}
//
//*****************************************************************************