125 lines
4.4 KiB
C
125 lines
4.4 KiB
C
/*
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* @brief FreeRTOS LPC43xx M0 core tick function using RITimer
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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 "chip.h"
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#include "FreeRTOS.h"
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/** @defgroup FreeRTOS_43XX_M0_TICK LPC43xx M0 core tick function using RITimer
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* @ingroup RTOS_FreeRTOS
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* @note This driver adds support for the RITimer for the FreeRTOS tick on the LPC43xx.
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* The M0 core in LPC43XX series of controllers does not have internal systick timer,
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* so the RITIMER is used to generate the RTOS ticks.
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* @{
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*/
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#if (defined(CHIP_LPC43XX) && defined(CORE_M0) && (configUSE_CUSTOM_TICK == 1))
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/*****************************************************************************
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* Private types/enumerations/variables
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****************************************************************************/
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#define portNVIC_PENDSVSET 0x10000000
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#define portNVIC_INT_CTRL ((volatile unsigned long *) 0xe000ed04)
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#define portMIN_INTERRUPT_PRIORITY (255UL)
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#define portNVIC_SYSTICK_PRI portMIN_INTERRUPT_PRIORITY
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#define RITENCLR (1 << 1)
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#define RITINT (1 << 0)
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/* Timer reload value for next tick */
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static uint32_t reload_val;
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/*****************************************************************************
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* Public types/enumerations/variables
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****************************************************************************/
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/* FreeRTOS tick update function */
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extern void vTaskIncrementTick(void);
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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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/**
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* @brief Tick interrupt handler routine
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* @return Nothing
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* @note This function handles the tick interrupts that are generated by RITIMER.
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*/
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void xPortSysTickHandler(void)
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{
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unsigned long ulDummy;
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/* TODO: check if WWDT interrupt and redirect */
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Chip_RIT_ClearInt(LPC_RITIMER);
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Chip_RIT_SetCOMPVAL(LPC_RITIMER, Chip_RIT_GetCounter(LPC_RITIMER) + reload_val);/* Reload value */
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#if configUSE_PREEMPTION == 1
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/* If using preemption, also force a context switch. */
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*(portNVIC_INT_CTRL) = portNVIC_PENDSVSET;
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#endif
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ulDummy = portSET_INTERRUPT_MASK_FROM_ISR();
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{
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vTaskIncrementTick();
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}
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portCLEAR_INTERRUPT_MASK_FROM_ISR(ulDummy);
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}
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/**
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* @brief Initialize tick interrupts
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* @return Nothing
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* @note This function initializes the tick interrupts, and must
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* be called before starting the freeRTOS scheduler.
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*/
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void prvSetupTimerInterrupt(void)
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{
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/* Clear any pending interrupt */
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Chip_RIT_ClearInt(LPC_RITIMER);
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/* Calculate reload value */
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reload_val = (configCPU_CLOCK_HZ / configTICK_RATE_HZ);
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Chip_RIT_SetCOMPVAL(LPC_RITIMER, Chip_RIT_GetCounter(LPC_RITIMER) + reload_val);/* Start tick */
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/* Set the priority and enable the interrupt */
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NVIC_SetPriority((IRQn_Type) RITIMER_IRQn, portNVIC_SYSTICK_PRI);
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NVIC_EnableIRQ((IRQn_Type) RITIMER_IRQn);
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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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