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lpc18xx_43xx_systick_arch.c
Go to the documentation of this file.
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/**********************************************************************
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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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/*****************************************************************************
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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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#if (defined(CHIP_LPC43XX) && defined(CORE_M0))
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#define RITIMER_IRQn_PRI (255)
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/* RITimer Reload value */
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static
uint32_t
reload_val;
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#endif
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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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#if (defined(CHIP_LPC43XX) && defined(CORE_M0))
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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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saved_period
= period;
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/* Clear any pending interrupt */
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Chip_RIT_ClearInt
();
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/* Calculate reload value */
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reload_val = (
SystemCoreClock
/ ( 1000 / period ) );
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Chip_RIT_SetCOMPVAL
(
Chip_RIT_GetCounter
() + reload_val);
/* Let it tick */
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/* Set the priority and enable the interrupt */
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NVIC_SetPriority((IRQn_Type) RITIMER_IRQn, RITIMER_IRQn_PRI);
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NVIC_EnableIRQ((IRQn_Type) RITIMER_IRQn);
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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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Chip_RIT_Cmd
(
DISABLE
);
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}
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void
RIT_IRQHandler
(
void
)
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{
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/* Clear RITimer Interrupt, Reload counter value */
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Chip_RIT_ClearInt
();
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Chip_RIT_SetCOMPVAL
(
Chip_RIT_GetCounter
() + reload_val);
/* Reload value */
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/* Increment tick count */
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systick_timems
+=
saved_period
;
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}
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#else
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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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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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SysTick->CTRL &= ~SysTick_CTRL_ENABLE_Msk;
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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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#endif
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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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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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#endif
/* NO_SYS == 1 */
software
lwip
lpclwip
arch
lpc18xx_43xx_systick_arch.c
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