96 lines
2.5 KiB
C
96 lines
2.5 KiB
C
/**********************************************************************
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* $Id$ lpc18xx_43xx_systick_arch.c 2011-11-20
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*//**
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* @file lpc18xx_43xx_systick_arch.c
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* @brief Setups up the system tick to generate a reference timebase
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* @version 1.0
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* @date 20. Nov. 2011
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* @author NXP MCU SW Application Team
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*
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* Copyright(C) 2011, NXP Semiconductor
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* All rights reserved.
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*
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***********************************************************************
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* Software that is described herein is for illustrative purposes only
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* which provides customers with programming information regarding the
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* products. This software is supplied "AS IS" without any warranties.
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* NXP Semiconductors assumes no responsibility or liability for the
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* use of the software, conveys no license or title under any patent,
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* copyright, or mask work right to the product. NXP Semiconductors
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* reserves the right to make changes in the software without
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* notification. NXP Semiconductors also make no representation or
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* warranty that such application will be suitable for the specified
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* use without further testing or modification.
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**********************************************************************/
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#include "lwip/opt.h"
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#if NO_SYS == 1
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#ifdef LPC43XX
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#include "lpc43xx_cgu.h"
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#else
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#ifdef LPC43XX
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#include "lpc18xx_cgu.h"
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#else
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#error LPC18XX or LPC43XX for target system not defined!
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#endif
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#endif
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#include "lpc_arch.h"
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/** @defgroup LPC18xx_43xx_systick LPC18xx_43xx LWIP (standalone) timer base
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* @ingroup LPC18xx_43xx
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* @{
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*/
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/* Saved reference period */
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static uint32_t saved_period;
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/* Saved total time in mS since timer was enabled */
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static volatile u32_t systick_timems;
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/* Enable systick rate and interrupt */
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void SysTick_Enable(uint32_t period)
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{
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saved_period = period;
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SysTick_Config(CGU_GetPCLKFrequency(CGU_PERIPHERAL_M4CORE) / (1000 / period));
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}
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/* Disable systick */
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void SysTick_Disable(void)
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{
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SysTick->CTRL &= ~SysTick_CTRL_ENABLE_Msk;
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}
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/** \brief SysTick IRQ handler and timebase management
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*
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* This function keeps a timebase for the sysTick that can be
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* used for other functions.
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*/
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void SysTick_Handler(void)
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{
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/* Increment tick count */
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systick_timems += saved_period;
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}
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/* Get the current systick time in milliSeconds */
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uint32_t SysTick_GetMS(void)
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{
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return systick_timems;
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}
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/* Delay for the specified number of milliSeconds */
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void msDelay(uint32_t ms)
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{
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uint32_t to = ms + systick_timems;
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while (to > systick_timems);
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}
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#endif
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/**
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* @}
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*/
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/* --------------------------------- End Of File ------------------------------ */
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