xref: /btstack/port/msp432p401lp-cc256x/ti/devices/msp432p4xx/driverlib/systick.h (revision 5fd0122a3e19d95e11e1f3eb8a08a2b2acb2557e)

/* --COPYRIGHT--,BSD
 * Copyright (c) 2017, Texas Instruments Incorporated
 * All rights reserved.
 *
 * 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.
 * --/COPYRIGHT--*/
#ifndef __SYSTICK_H__
#define __SYSTICK_H__

//*****************************************************************************
//
//! \addtogroup systick_api
//! @{
//
//*****************************************************************************

//*****************************************************************************
//
// If building with a C++ compiler, make all of the definitions in this header
// have a C binding.
//
//*****************************************************************************
#ifdef __cplusplus
extern "C"
{
#endif
#include <stdint.h>

//*****************************************************************************
//
// Prototypes for the APIs.
//
//*****************************************************************************

//*****************************************************************************
//
//! Enables the SysTick counter.
//!
//! This function starts the SysTick counter.  If an interrupt handler has been
//! registered, it is called when the SysTick counter rolls over.
//!
//! \note Calling this function causes the SysTick counter to (re)commence
//! counting from its current value.  The counter is not automatically reloaded
//! with the period as specified in a previous call to SysTick_setPeriod().  If
//! an immediate reload is required, the \b NVIC_ST_CURRENT register must be
//! written to force the reload.  Any write to this register clears the SysTick
//! counter to 0 and causes a reload with the supplied period on the next
//! clock.
//!
//! \return None.
//
//*****************************************************************************
extern void SysTick_enableModule(void);

//*****************************************************************************
//
//! Disables the SysTick counter.
//!
//! This function stops the SysTick counter.  If an interrupt handler has been
//! registered, it is not called until SysTick is restarted.
//!
//! \return None.
//
//*****************************************************************************
extern void SysTick_disableModule(void);

//*****************************************************************************
//
//! Registers an interrupt handler for the SysTick interrupt.
//!
//! \param intHandler is a pointer to the function to be called when the
//! SysTick interrupt occurs.
//!
//! This function registers the handler to be called when a SysTick interrupt
//! occurs.
//!
//! \sa Interrupt_registerInterrupt() for important information about
//! registering interrupt handlers.
//!
//! \return None.
//
//*****************************************************************************
extern void SysTick_registerInterrupt(void (*intHandler)(void));

//*****************************************************************************
//
//! Unregisters the interrupt handler for the SysTick interrupt.
//!
//! This function unregisters the handler to be called when a SysTick interrupt
//! occurs.
//!
//! \sa Interrupt_registerInterrupt() for important information about
//! registering interrupt handlers.
//!
//! \return None.
//
//*****************************************************************************
extern void SysTick_unregisterInterrupt(void);

//*****************************************************************************
//
//! Enables the SysTick interrupt.
//!
//! This function enables the SysTick interrupt, allowing it to be
//! reflected to the processor.
//!
//! \note The SysTick interrupt handler is not required to clear the SysTick
//! interrupt source because it is cleared automatically by the NVIC when the
//! interrupt handler is called.
//!
//! \return None.
//
//*****************************************************************************
extern void SysTick_enableInterrupt(void);

//*****************************************************************************
//
//! Disables the SysTick interrupt.
//!
//! This function disables the SysTick interrupt, preventing it from being
//! reflected to the processor.
//!
//! \return None.
//
//*****************************************************************************
extern void SysTick_disableInterrupt(void);

//*****************************************************************************
//
//! Sets the period of the SysTick counter.
//!
//! \param period is the number of clock ticks in each period of the SysTick
//! counter and must be between 1 and 16,777,216, inclusive.
//!
//! This function sets the rate at which the SysTick counter wraps, which
//! equates to the number of processor clocks between interrupts.
//!
//! \note Calling this function does not cause the SysTick counter to reload
//! immediately.  If an immediate reload is required, the \b NVIC_ST_CURRENT
//! register must be written.  Any write to this register clears the SysTick
//! counter to 0 and causes a reload with the \e period supplied here on
//! the next clock after SysTick is enabled.
//!
//! \return None.
//
//*****************************************************************************
extern void SysTick_setPeriod(uint32_t period);

//*****************************************************************************
//
//! Gets the period of the SysTick counter.
//!
//! This function returns the rate at which the SysTick counter wraps, which
//! equates to the number of processor clocks between interrupts.
//!
//! \return Returns the period of the SysTick counter.
//
//*****************************************************************************
extern uint32_t SysTick_getPeriod(void);

//*****************************************************************************
//
//! Gets the current value of the SysTick counter.
//!
//! This function returns the current value of the SysTick counter, which is
//! a value between the period - 1 and zero, inclusive.
//!
//! \return Returns the current value of the SysTick counter.
//
//*****************************************************************************
extern uint32_t SysTick_getValue(void);

//*****************************************************************************
//
// Mark the end of the C bindings section for C++ compilers.
//
//*****************************************************************************
#ifdef __cplusplus
}
#endif

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

#endif // __SYSTICK_H__