diff options
| author | Yuval Adam <yuv.adm@gmail.com> | 2012-10-29 21:36:23 +0200 |
|---|---|---|
| committer | Yuval Adam <yuv.adm@gmail.com> | 2012-10-29 21:36:23 +0200 |
| commit | 44b979ac3dc53b29ee8176517b7d9a10935630c0 (patch) | |
| tree | 03c256e5e19ac2be9d19b3d4638cdf233b0ee4e9 /driverlib/sysexc.c | |
| parent | 8ced6b65a22e0c392bc31288b2eb3f713a0fc477 (diff) | |
Initial code
Diffstat (limited to 'driverlib/sysexc.c')
| -rw-r--r-- | driverlib/sysexc.c | 256 |
1 files changed, 256 insertions, 0 deletions
diff --git a/driverlib/sysexc.c b/driverlib/sysexc.c new file mode 100644 index 0000000..3e983eb --- /dev/null +++ b/driverlib/sysexc.c @@ -0,0 +1,256 @@ +//*****************************************************************************
+//
+// sysexc.c - Routines for the System Exception Module.
+//
+// Copyright (c) 2011-2012 Texas Instruments Incorporated. All rights reserved.
+// Software License Agreement
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions
+// are met:
+//
+// Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//
+// Redistributions in binary form must reproduce the above copyright
+// notice, this list of conditions and the following disclaimer in the
+// documentation and/or other materials provided with the
+// distribution.
+//
+// Neither the name of Texas Instruments Incorporated nor the names of
+// its contributors may be used to endorse or promote products derived
+// from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+// This is part of revision 9453 of the Stellaris Peripheral Driver Library.
+//
+//*****************************************************************************
+
+//*****************************************************************************
+//
+//! \addtogroup sysexc_api
+//! @{
+//
+//*****************************************************************************
+
+#include "inc/hw_ints.h"
+#include "inc/hw_sysexc.h"
+#include "inc/hw_types.h"
+#include "driverlib/interrupt.h"
+
+//*****************************************************************************
+//
+//! Registers an interrupt handler for the system exception interrupt.
+//!
+//! \param pfnHandler is a pointer to the function to be called when the system
+//! exception interrupt occurs.
+//!
+//! This function places the address of the system exception interrupt handler
+//! into the interrupt vector table in SRAM. This function also enables the
+//! global interrupt in the interrupt controller; specific system exception
+//! interrupts must be enabled via SysExcIntEnable(). It is the interrupt
+//! handler's responsibility to clear the interrupt source.
+//!
+//! \sa IntRegister() for important information about registering interrupt
+//! handlers.
+//!
+//! \return None.
+//
+//*****************************************************************************
+void
+SysExcIntRegister(void (*pfnHandler)(void))
+{
+ //
+ // Register the interrupt handler.
+ //
+ IntRegister(INT_SYSEXC, pfnHandler);
+
+ //
+ // Enable the system exception interrupt.
+ //
+ IntEnable(INT_SYSEXC);
+}
+
+//*****************************************************************************
+//
+//! Unregisters the system exception interrupt handler.
+//!
+//! This function removes the system exception interrupt handler from the
+//! vector table in SRAM. This function also masks off the system exception
+//! interrupt in the interrupt controller so that the interrupt handler is no
+//! longer called.
+//!
+//! \sa IntRegister() for important information about registering interrupt
+//! handlers.
+//!
+//! \return None.
+//
+//*****************************************************************************
+void
+SysExcIntUnregister(void)
+{
+ //
+ // Disable the system exception interrupt.
+ //
+ IntDisable(INT_SYSEXC);
+
+ //
+ // Unregister the system exception interrupt handler.
+ //
+ IntUnregister(INT_SYSEXC);
+}
+
+//*****************************************************************************
+//
+//! Enables individual system exception interrupt sources.
+//!
+//! \param ulIntFlags is the bit mask of the interrupt sources to be enabled.
+//!
+//! This function enables the indicated system exception interrupt sources.
+//! Only the sources that are enabled can be reflected to the processor
+//! interrupt; disabled sources have no effect on the processor.
+//!
+//! The \e ulIntFlags parameter is the logical OR of any of the following:
+//!
+//! - \b SYSEXC_INT_FP_IXC - Floating-point inexact exception interrupt
+//! - \b SYSEXC_INT_FP_OFC - Floating-point overflow exception interrupt
+//! - \b SYSEXC_INT_FP_UFC - Floating-point underflow exception interrupt
+//! - \b SYSEXC_INT_FP_IOC - Floating-point invalid operation interrupt
+//! - \b SYSEXC_INT_FP_DZC - Floating-point divide by zero exception interrupt
+//! - \b SYSEXC_INT_FP_IDC - Floating-point input denormal exception interrupt
+//!
+//! \return None.
+//
+//*****************************************************************************
+void
+SysExcIntEnable(unsigned long ulIntFlags)
+{
+ //
+ // Enable the specified interrupts.
+ //
+ HWREG(SYSEXC_IM) |= ulIntFlags;
+}
+
+//*****************************************************************************
+//
+//! Disables individual system exception interrupt sources.
+//!
+//! \param ulIntFlags is the bit mask of the interrupt sources to be disabled.
+//!
+//! This function disables the indicated system exception interrupt sources.
+//! Only sources that are enabled can be reflected to the processor interrupt;
+//! disabled sources have no effect on the processor.
+//!
+//! The \e ulIntFlags parameter is the logical OR of any of the following:
+//!
+//! - \b SYSEXC_INT_FP_IXC - Floating-point inexact exception interrupt
+//! - \b SYSEXC_INT_FP_OFC - Floating-point overflow exception interrupt
+//! - \b SYSEXC_INT_FP_UFC - Floating-point underflow exception interrupt
+//! - \b SYSEXC_INT_FP_IOC - Floating-point invalid operation interrupt
+//! - \b SYSEXC_INT_FP_DZC - Floating-point divide by zero exception interrupt
+//! - \b SYSEXC_INT_FP_IDC - Floating-point input denormal exception interrupt
+//!
+//! \return None.
+//
+//*****************************************************************************
+void
+SysExcIntDisable(unsigned long ulIntFlags)
+{
+ //
+ // Disable the specified interrupts.
+ //
+ HWREG(SYSEXC_IM) &= ~(ulIntFlags);
+}
+
+//*****************************************************************************
+//
+//! Gets the current system exception interrupt status.
+//!
+//! \param bMasked is \b false if the raw interrupt status is required and
+//! \b true if the masked interrupt status is required.
+//!
+//! This function returns the system exception interrupt status. Either the
+//! raw interrupt status or the status of interrupts that are allowed to
+//! reflect to the processor can be returned.
+//!
+//! \return Returns the current system exception interrupt status, enumerated
+//! as the logical OR of \b SYSEXC_INT_FP_IXC, \b SYSEXC_INT_FP_OFC,
+//! \b SYSEXC_INT_FP_UFC, \b SYSEXC_INT_FP_IOC, \b SYSEXC_INT_FP_DZC, and
+//! \b SYSEXC_INT_FP_IDC.
+//
+//*****************************************************************************
+unsigned long
+SysExcIntStatus(tBoolean bMasked)
+{
+ //
+ // Return either the interrupt status or the raw interrupt status as
+ // requested.
+ //
+ if(bMasked)
+ {
+ return(HWREG(SYSEXC_MIS));
+ }
+ else
+ {
+ return(HWREG(SYSEXC_RIS));
+ }
+}
+
+//*****************************************************************************
+//
+//! Clears system exception interrupt sources.
+//!
+//! \param ulIntFlags is a bit mask of the interrupt sources to be cleared.
+//!
+//! This function clears the specified system exception interrupt sources, so
+//! that they no longer assert. This function must be called in the interrupt
+//! handler to keep the interrupt from being recognized again immediately upon
+//! exit.
+//!
+//! The \e ulIntFlags parameter is the logical OR of any of the following:
+//!
+//! - \b SYSEXC_INT_FP_IXC - Floating-point inexact exception interrupt
+//! - \b SYSEXC_INT_FP_OFC - Floating-point overflow exception interrupt
+//! - \b SYSEXC_INT_FP_UFC - Floating-point underflow exception interrupt
+//! - \b SYSEXC_INT_FP_IOC - Floating-point invalid operation interrupt
+//! - \b SYSEXC_INT_FP_DZC - Floating-point divide by zero exception interrupt
+//! - \b SYSEXC_INT_FP_IDC - Floating-point input denormal exception interrupt
+//!
+//! \note Because there is a write buffer in the Cortex-M 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 (because the interrupt controller still sees
+//! the interrupt source asserted).
+//!
+//! \return None.
+//
+//*****************************************************************************
+void
+SysExcIntClear(unsigned long ulIntFlags)
+{
+ //
+ // Clear the requested interrupt sources.
+ //
+ HWREG(SYSEXC_IC) = ulIntFlags;
+}
+
+//*****************************************************************************
+//
+// Close the Doxygen group.
+//! @}
+//
+//*****************************************************************************
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