watchdog.c

基于 Cortex-M3 (ARM) 内核使用之 uC/OS-II 作业系统,此例程可移植于 Cortex-M3 (ARM)内核的微处理器上的应用,于 Keil MDK 3.15b以上 工程编译,而

//!
//! \sa WatchdogReloadSet()
//!
//! \return None.
//
//*****************************************************************************
unsigned long
WatchdogReloadGet(unsigned long ulBase)
{
    //
    // Check the arguments.
    //
    ASSERT(ulBase == WATCHDOG_BASE);

    //
    // Get the load register.
    //
    return(HWREG(ulBase + WDT_O_LOAD));
}

//*****************************************************************************
//
//! Gets the current watchdog timer value.
//!
//! \param ulBase is the base address of the watchdog timer module.
//!
//! This function reads the current value of the watchdog timer.
//!
//! \return Returns the current value of the watchdog timer.
//
//*****************************************************************************
unsigned long
WatchdogValueGet(unsigned long ulBase)
{
    //
    // Check the arguments.
    //
    ASSERT(ulBase == WATCHDOG_BASE);

    //
    // Get the current watchdog timer register value.
    //
    return(HWREG(ulBase + WDT_O_VALUE));
}

//*****************************************************************************
//
//! Registers an interrupt.handler for watchdog timer interrupt.
//!
//! \param ulBase is the base address of the watchdog timer module.
//! \param pfnHandler is a pointer to the function to be called when the
//! watchdog timer interrupt occurs.
//!
//! This function does the actual registering of the interrupt.handler.  This
//! will enable the global interrupt in the interrupt controller; the watchdog
//! timer interrupt must be enabled via WatchdogEnable(). It is the interrupt
//! handler's responsibility to clear the interrupt source via
//! WatchdogIntClear().
//!
//! \sa IntRegister() for important information about registering interrupt
//! handlers.
//!
//! \return None.
//
//*****************************************************************************
void
WatchdogIntRegister(unsigned long ulBase, void (*pfnHandler)(void))
{
    //
    // Check the arguments.
    //
    ASSERT(ulBase == WATCHDOG_BASE);

    //
    // Register the interrupt.handler.
    //
    IntRegister(INT_WATCHDOG, pfnHandler);

    //
    // Enable the watchdog timer interrupt.
    //
    IntEnable(INT_WATCHDOG);
}

//*****************************************************************************
//
//! Unregisters an interrupt.handler for the watchdog timer interrupt.
//!
//! \param ulBase is the base address of the watchdog timer module.
//!
//! This function does the actual unregistering of the interrupt.handler.  This
//! function will clear the handler to be called when a watchdog timer
//! interrupt occurs.  This will also mask off the interrupt in the interrupt
//! controller so that the interrupt.handler no longer is called.
//!
//! \sa IntRegister() for important information about registering interrupt
//! handlers.
//!
//! \return None.
//
//*****************************************************************************
void
WatchdogIntUnregister(unsigned long ulBase)
{
    //
    // Check the arguments.
    //
    ASSERT(ulBase == WATCHDOG_BASE);

    //
    // Disable the interrupt.
    //
    IntDisable(INT_WATCHDOG);

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

//*****************************************************************************
//
//! Enables the watchdog timer interrupt.
//!
//! \param ulBase is the base address of the watchdog timer module.
//!
//! Enables the watchdog timer interrupt.
//!
//! \note This function will have no effect if the watchdog timer has
//! been locked.
//!
//! \sa WatchdogLock(), WatchdogUnlock(), WatchdogEnable()
//!
//! \return None.
//
//*****************************************************************************
void
WatchdogIntEnable(unsigned long ulBase)
{
    //
    // Check the arguments.
    //
    ASSERT(ulBase == WATCHDOG_BASE);

    //
    // Enable the watchdog interrupt.
    //
    HWREG(ulBase + WDT_O_CTL) |= WDT_CTL_INTEN;
}

//*****************************************************************************
//
//! Gets the current watchdog timer interrupt status.
//!
//! \param ulBase is the base address of the watchdog timer module.
//! \param bMasked is \b false if the raw interrupt status is required and
//! \b true if the masked interrupt status is required.
//!
//! This returns the interrupt status for the watchdog timer module.  Either
//! the raw interrupt status or the status of interrupt that is allowed to
//! reflect to the processor can be returned.
//!
//! \return The current interrupt status, where a 1 indicates that the watchdog
//! interrupt is active, and a 0 indicates that it is not active.
//
//*****************************************************************************
unsigned long
WatchdogIntStatus(unsigned long ulBase, tBoolean bMasked)
{
    //
    // Check the arguments.
    //
    ASSERT(ulBase == WATCHDOG_BASE);

    //
    // Return either the interrupt status or the raw interrupt status as
    // requested.
    //
    if(bMasked)
    {
        return(HWREG(ulBase + WDT_O_MIS));
    }
    else
    {
        return(HWREG(ulBase + WDT_O_RIS));
    }
}

//*****************************************************************************
//
//! Clears the watchdog timer interrupt.
//!
//! \param ulBase is the base address of the watchdog timer module.
//!
//! The watchdog timer interrupt source is cleared, so that it no longer
//! asserts.
//!
//! \return None.
//
//*****************************************************************************
void
WatchdogIntClear(unsigned long ulBase)
{
    //
    // Check the arguments.
    //
    ASSERT(ulBase == WATCHDOG_BASE);

    //
    // Clear the interrupt source.
    //
    HWREG(ulBase + WDT_O_ICR) = WDT_INT_TIMEOUT;
}

//*****************************************************************************
//
//! Enables stalling of the watchdog timer during debug events.
//!
//! \param ulBase is the base address of the watchdog timer module.
//!
//! This function allows the watchdog timer to stop counting when the processor
//! is stopped by the debugger.  By doing so, the watchdog is prevented from
//! expiring (typically almost immediately from a human time perspective) and
//! resetting the system (if reset is enabled).  The watchdog will instead
//! expired after the appropriate number of processor cycles have been executed
//! while debugging (or at the appropriate time after the processor has been
//! restarted).
//!
//! \return None.
//
//*****************************************************************************
void
WatchdogStallEnable(unsigned long ulBase)
{
    //
    // Check the arguments.
    //
    ASSERT(ulBase == WATCHDOG_BASE);

    //
    // Enable timer stalling.
    //
    HWREG(ulBase + WDT_O_TEST) |= WDT_TEST_STALL;
}

//*****************************************************************************
//
//! Disables stalling of the watchdog timer during debug events.
//!
//! \param ulBase is the base address of the watchdog timer module.
//!
//! This function disables the debug mode stall of the watchdog timer.  By
//! doing so, the watchdog timer continues to count regardless of the processor
//! debug state.
//!
//! \return None.
//
//*****************************************************************************
void
WatchdogStallDisable(unsigned long ulBase)
{
    //
    // Check the arguments.
    //
    ASSERT(ulBase == WATCHDOG_BASE);

    //
    // Disable timer stalling.
    //
    HWREG(ulBase + WDT_O_TEST) &= ~(WDT_TEST_STALL);
}

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