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New demo for M3 using LM3S811 and IAR tools.
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Richard Barry
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262
Demo/CORTEX_LM3S811_IAR/LuminaryCode/systick.c
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Demo/CORTEX_LM3S811_IAR/LuminaryCode/systick.c
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//*****************************************************************************
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//
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// systick.c - Driver for the SysTick timer in NVIC.
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//
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// Copyright (c) 2005,2006 Luminary Micro, Inc. All rights reserved.
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//
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// Software License Agreement
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//
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// Luminary Micro, Inc. (LMI) is supplying this software for use solely and
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// exclusively on LMI's Stellaris Family of microcontroller products.
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//
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// The software is owned by LMI and/or its suppliers, and is protected under
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// applicable copyright laws. All rights are reserved. Any use in violation
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// of the foregoing restrictions may subject the user to criminal sanctions
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// under applicable laws, as well as to civil liability for the breach of the
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// terms and conditions of this license.
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//
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// THIS SOFTWARE IS PROVIDED "AS IS". NO WARRANTIES, WHETHER EXPRESS, IMPLIED
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// OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF
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// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE.
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// LMI SHALL NOT, IN ANY CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL, OR
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// CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER.
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//
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// This is part of revision 991 of the Stellaris Driver Library.
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//
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//*****************************************************************************
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//*****************************************************************************
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//
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//! \addtogroup systick_api
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//! @{
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//
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//*****************************************************************************
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#include "../hw_ints.h"
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#include "../hw_nvic.h"
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#include "../hw_types.h"
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#include "debug.h"
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#include "interrupt.h"
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#include "systick.h"
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//*****************************************************************************
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//
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//! Enables the SysTick counter.
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//!
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//! This will start the SysTick counter. If an interrupt handler has been
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//! registered, it will be called when the SysTick counter rolls over.
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//!
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//! \return None.
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//
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//*****************************************************************************
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#if defined(GROUP_enable) || defined(BUILD_ALL) || defined(DOXYGEN)
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void
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SysTickEnable(void)
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{
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//
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// Enable SysTick.
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//
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HWREG(NVIC_ST_CTRL) |= NVIC_ST_CTRL_CLK_SRC | NVIC_ST_CTRL_ENABLE;
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}
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#endif
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//*****************************************************************************
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//
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//! Disables the SysTick counter.
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//!
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//! This will stop the SysTick counter. If an interrupt handler has been
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//! registered, it will no longer be called until SysTick is restarted.
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//!
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//! \return None.
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//
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//*****************************************************************************
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#if defined(GROUP_disable) || defined(BUILD_ALL) || defined(DOXYGEN)
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void
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SysTickDisable(void)
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{
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//
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// Disable SysTick.
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//
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HWREG(NVIC_ST_CTRL) &= ~(NVIC_ST_CTRL_ENABLE);
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}
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#endif
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//*****************************************************************************
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//
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//! Registers an interrupt handler for the SysTick interrupt.
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//!
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//! \param pfnHandler is a pointer to the function to be called when the
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//! SysTick interrupt occurs.
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//!
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//! This sets the handler to be called when a SysTick interrupt occurs.
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//!
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//! \sa IntRegister() for important information about registering interrupt
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//! handlers.
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//!
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//! \return None.
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//
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//*****************************************************************************
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#if defined(GROUP_intregister) || defined(BUILD_ALL) || defined(DOXYGEN)
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void
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SysTickIntRegister(void (*pfnHandler)(void))
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{
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//
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// Register the interrupt handler, returning an error if an error occurs.
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//
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IntRegister(FAULT_SYSTICK, pfnHandler);
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//
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// Enable the SysTick interrupt.
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//
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HWREG(NVIC_ST_CTRL) |= NVIC_ST_CTRL_INTEN;
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}
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#endif
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//*****************************************************************************
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//
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//! Unregisters the interrupt handler for the SysTick interrupt.
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//!
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//! This function will clear the handler to be called when a SysTick interrupt
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//! occurs.
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//!
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//! \sa IntRegister() for important information about registering interrupt
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//! handlers.
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//!
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//! \return None.
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//
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//*****************************************************************************
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#if defined(GROUP_intunregister) || defined(BUILD_ALL) || defined(DOXYGEN)
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void
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SysTickIntUnregister(void)
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{
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//
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// Disable the SysTick interrupt.
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//
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HWREG(NVIC_ST_CTRL) &= ~(NVIC_ST_CTRL_INTEN);
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//
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// Unregister the interrupt handler.
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//
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IntUnregister(FAULT_SYSTICK);
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}
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#endif
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//*****************************************************************************
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//
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//! Enables the SysTick interrupt.
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//!
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//! This function will enable the SysTick interrupt, allowing it to be
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//! reflected to the processor.
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//!
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//! \return None.
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//
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//*****************************************************************************
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#if defined(GROUP_intenable) || defined(BUILD_ALL) || defined(DOXYGEN)
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void
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SysTickIntEnable(void)
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{
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//
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// Enable the SysTick interrupt.
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//
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HWREG(NVIC_ST_CTRL) |= NVIC_ST_CTRL_INTEN;
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}
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#endif
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//*****************************************************************************
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//
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//! Disables the SysTick interrupt.
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//!
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//! This function will disable the SysTick interrupt, preventing it from being
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//! reflected to the processor.
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//!
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//! \return None.
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//
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//*****************************************************************************
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#if defined(GROUP_intdisable) || defined(BUILD_ALL) || defined(DOXYGEN)
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void
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SysTickIntDisable(void)
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{
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//
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// Disable the SysTick interrupt.
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//
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HWREG(NVIC_ST_CTRL) &= ~(NVIC_ST_CTRL_INTEN);
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}
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#endif
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//*****************************************************************************
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//
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//! Sets the period of the SysTick counter.
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//!
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//! \param ulPeriod is the number of clock ticks in each period of the SysTick
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//! counter; must be between 1 and 16,777,216, inclusive.
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//!
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//! This function sets the rate at which the SysTick counter wraps; this
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//! equates to the number of processor clocks between interrupts.
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//!
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//! \return None.
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//
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//*****************************************************************************
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#if defined(GROUP_periodset) || defined(BUILD_ALL) || defined(DOXYGEN)
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void
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SysTickPeriodSet(unsigned long ulPeriod)
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{
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//
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// Check the arguments.
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//
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ASSERT((ulPeriod > 0) && (ulPeriod <= 16777216));
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//
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// Set the period of the SysTick counter.
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//
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HWREG(NVIC_ST_RELOAD) = ulPeriod - 1;
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}
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#endif
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//*****************************************************************************
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//
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//! Gets the period of the SysTick counter.
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//!
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//! This function returns the rate at which the SysTick counter wraps; this
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//! equates to the number of processor clocks between interrupts.
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//!
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//! \return Returns the period of the SysTick counter.
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//
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//*****************************************************************************
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#if defined(GROUP_periodget) || defined(BUILD_ALL) || defined(DOXYGEN)
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unsigned long
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SysTickPeriodGet(void)
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{
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//
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// Return the period of the SysTick counter.
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//
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return(HWREG(NVIC_ST_RELOAD) + 1);
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}
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#endif
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//*****************************************************************************
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//
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//! Gets the current value of the SysTick counter.
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//!
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//! This function returns the current value of the SysTick counter; this will
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//! be a value between the period - 1 and zero, inclusive.
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//!
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//! \return Returns the current value of the SysTick counter.
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//
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//*****************************************************************************
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#if defined(GROUP_valueget) || defined(BUILD_ALL) || defined(DOXYGEN)
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unsigned long
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SysTickValueGet(void)
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{
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//
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// Return the current value of the SysTick counter.
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//
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return(HWREG(NVIC_ST_CURRENT));
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}
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#endif
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//*****************************************************************************
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//
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// Close the Doxygen group.
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//! @}
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//
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//*****************************************************************************
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