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143 lines
4.2 KiB
C
143 lines
4.2 KiB
C
/**********************************************************************
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* @brief Setups up the LWIP timebase (tick)
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*
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* @note
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* Copyright(C) NXP Semiconductors, 2012
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* All rights reserved.
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*
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* @par
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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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* LPC products. This software is supplied "AS IS" without any warranties of
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* any kind, and NXP Semiconductors and its licensor disclaim any and
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* all warranties, express or implied, including all implied warranties of
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* merchantability, fitness for a particular purpose and non-infringement of
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* intellectual property rights. NXP Semiconductors assumes no responsibility
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* or liability for the use of the software, conveys no license or rights under any
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* patent, copyright, mask work right, or any other intellectual property rights in
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* or to any products. NXP Semiconductors reserves the right to make changes
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* in the software without notification. NXP Semiconductors also makes no
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* representation or warranty that such application will be suitable for the
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* specified use without further testing or modification.
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*
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* @par
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* Permission to use, copy, modify, and distribute this software and its
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* documentation is hereby granted, under NXP Semiconductors' and its
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* licensor's relevant copyrights in the software, without fee, provided that it
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* is used in conjunction with NXP Semiconductors microcontrollers. This
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* copyright, permission, and disclaimer notice must appear in all copies of
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* this code.
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*/
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#include "lwip/opt.h"
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#if NO_SYS == 1
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#include "chip.h"
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#include "lpc_arch.h"
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/** @ingroup NET_LWIP_ARCH
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* @{
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*/
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/*****************************************************************************
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* Private types/enumerations/variables
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****************************************************************************/
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/* Saved reference period foe standalone mode */
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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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/*****************************************************************************
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* Public types/enumerations/variables
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****************************************************************************/
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/* Current system clock rate, mainly used for sysTick */
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extern uint32_t SystemCoreClock;
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/*****************************************************************************
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* Private functions
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****************************************************************************/
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/*****************************************************************************
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* Public functions
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****************************************************************************/
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/* Enable LWIP tick and interrupt */
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void SysTick_Enable(uint32_t period)
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{
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/* Initialize System Tick with time interval */
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// SYSTICK_InternalInit(period); // FIXME
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// saved_period = period; // FIXME
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// systick_timems = 0; // FIXME
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/* Enable System Tick interrupt */
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// SYSTICK_IntCmd(ENABLE); // FIXME
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/* Enable System Tick Counter */
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// SYSTICK_Cmd(ENABLE); // FIXME
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saved_period = period;
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SysTick_Config((SystemCoreClock * period) / 1000);
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}
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/* Disable LWIP tick */
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void SysTick_Disable(void)
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{
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/* Disable System Tick Counter */
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// SYSTICK_Cmd(DISABLE); // FIXME
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/* Disable System Tick interrupt */
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// SYSTICK_IntCmd(DISABLE); // FIXME
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SysTick->CTRL &= ~SysTick_CTRL_ENABLE_Msk;
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}
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/**
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* @brief SysTick IRQ handler and timebase management
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* @return Nothing
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* @note This function keeps a timebase for LWIP 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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/* Clear System Tick counter flag */
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// SYSTICK_ClearCounterFlag(); // FIXME
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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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/**
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* @brief LWIP standalone mode time support
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* @return Returns the current time in mS
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* @note Returns the current time in mS. This is needed for the LWIP timers
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*/
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u32_t sys_now(void)
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{
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return (u32_t) SysTick_GetMS();
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}
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/**
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* @}
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*/
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#endif /* NO_SYS == 1 */
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