134 lines
4.3 KiB
C
134 lines
4.3 KiB
C
/****************************************************************************
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* arch/arm/src/s32k3xx/s32k3xx_timerisr.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/* Copyright 2022 NXP */
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdint.h>
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#include <time.h>
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#include <assert.h>
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#include <debug.h>
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#include <nuttx/arch.h>
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#include <arch/board/board.h>
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#include "nvic.h"
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#include "arm_internal.h"
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#include "clock/clock.h"
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#include "s32k3xx_clockconfig.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* The SysTick clock input (Fsystick) is determined by the CLKSOURCE file of
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* the SysTick CSR register: The CLKSOURCE field in SysTick Control and
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* Status register selects either the core clock (when CLKSOURCE = 1) or a
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* divide-by-16 of the core clock (when CLKSOURCE = 0).
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*
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* The desired timer interrupt frequency is provided by the definition
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* CLK_TCK (see include/time.h). CLK_TCK defines the desired number of
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* system clock ticks per second. That value is a user configurable setting
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* that defaults to 100 (100 ticks per second = 10 MS interval).
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*
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* reload = (Fsystick / CLK_TICK) - 1
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*/
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#define SYSTICK_RELOAD(coreclk) (((coreclk) / CLK_TCK) - 1)
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Function: s32k3xx_timerisr
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*
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* Description:
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* The timer ISR will perform a variety of services for various portions
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* of the systems.
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*
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****************************************************************************/
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static int s32k3xx_timerisr(int irq, uint32_t *regs, void *arg)
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{
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/* Process timer interrupt */
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nxsched_process_timer();
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return 0;
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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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* Function: up_timer_initialize
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*
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* Description:
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* This function is called during start-up to initialize
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* the timer interrupt.
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*
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****************************************************************************/
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void up_timer_initialize(void)
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{
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uint32_t coreclk;
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uint32_t reload;
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/* Make sure that the SYSTICK clock source is set to use the SysTick
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* function clock (CLKSOURCE==1).
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*/
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putreg32(NVIC_SYSTICK_CTRL_CLKSOURCE, NVIC_SYSTICK_CTRL);
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/* Get the reload value */
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coreclk = s32k3xx_get_coreclk();
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reload = SYSTICK_RELOAD(coreclk);
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/* The size of the reload field is 24 bits. */
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DEBUGASSERT(reload <= 0x00ffffff);
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/* Configure SysTick to interrupt at the requested rate */
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putreg32(reload, NVIC_SYSTICK_RELOAD);
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putreg32(0, NVIC_SYSTICK_CURRENT);
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/* Attach the timer interrupt vector */
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irq_attach(S32K3XX_IRQ_SYSTICK, (xcpt_t)s32k3xx_timerisr, NULL);
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/* Enable SysTick interrupts */
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putreg32((NVIC_SYSTICK_CTRL_CLKSOURCE | NVIC_SYSTICK_CTRL_TICKINT |
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NVIC_SYSTICK_CTRL_ENABLE), NVIC_SYSTICK_CTRL);
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/* And enable the timer interrupt */
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up_enable_irq(S32K3XX_IRQ_SYSTICK);
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}
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