89 lines
3.9 KiB
C
89 lines
3.9 KiB
C
/************************************************************************************//**
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* \file Demo/ARMCM4_S32K14_S32K144EVB_IAR/Prog/timer.c
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* \brief Timer driver source file.
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* \ingroup Prog_ARMCM4_S32K14_S32K144EVB_IAR
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* \internal
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*----------------------------------------------------------------------------------------
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* C O P Y R I G H T
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*----------------------------------------------------------------------------------------
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* Copyright (c) 2020 by Feaser http://www.feaser.com All rights reserved
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*
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*----------------------------------------------------------------------------------------
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* L I C E N S E
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*----------------------------------------------------------------------------------------
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* This file is part of OpenBLT. OpenBLT is free software: you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as published by the Free
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* Software Foundation, either version 3 of the License, or (at your option) any later
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* version.
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*
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* OpenBLT is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU General Public License for more details.
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*
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* You have received a copy of the GNU General Public License along with OpenBLT. It
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* should be located in ".\Doc\license.html". If not, contact Feaser to obtain a copy.
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*
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* \endinternal
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****************************************************************************************/
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/****************************************************************************************
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* Include files
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****************************************************************************************/
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#include "header.h" /* generic header */
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/****************************************************************************************
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* Local data declarations
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****************************************************************************************/
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/** \brief Local variable for storing the number of milliseconds that have elapsed since
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* startup.
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*/
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static unsigned long millisecond_counter;
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/************************************************************************************//**
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** \brief Initializes the timer.
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** \return none.
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**
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****************************************************************************************/
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void TimerInit(void)
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{
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/* Configure the systick frequency as a 1 ms event generator. */
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S32_SysTick->RVR = (SystemCoreClock / 1000U) - 1U;
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/* Reset the current counter value. */
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S32_SysTick->CVR = 0U;
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/* Select core clock as source and enable the timer. */
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S32_SysTick->CSR = S32_SysTick_CSR_ENABLE_MASK |
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S32_SysTick_CSR_TICKINT_MASK |
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S32_SysTick_CSR_CLKSOURCE_MASK;
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/* Reset the millisecond counter value. */
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millisecond_counter = 0U;
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} /*** end of TimerInit ***/
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/************************************************************************************//**
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** \brief Obtains the counter value of the millisecond timer.
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** \return Current value of the millisecond timer.
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**
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****************************************************************************************/
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unsigned long TimerGet(void)
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{
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/* Read and return the tick counter value. */
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return millisecond_counter;
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} /*** end of TimerGet ***/
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/************************************************************************************//**
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** \brief Interrupt service routine of the timer.
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** \return none.
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**
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****************************************************************************************/
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void SysTick_Handler(void)
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{
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/* Increment the millisecond counter. */
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millisecond_counter++;
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} /*** end of SysTick_Handler ***/
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/*********************************** end of timer.c ************************************/
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