2018-03-26 18:37:32 +02:00
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/****************************************************************************
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* arch/arm/src/nrf52/nrf52_timerisr.c
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*
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* Copyright (C) 2018 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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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 <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 "clock/clock.h"
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#include "up_internal.h"
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#include "up_arch.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* The SysTick clock may be clocked internally either by the by the system
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* clock (CLKSOURCE==1) or by the SysTick function clock (CLKSOURCE==0).
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* The SysTick Function clock is equal to:
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*
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* Fsystick = Fmainclk / SYSTICKCLKDIV
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*
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* Both the divider value (BOARD_SYSTICKCLKDIV) and the resulting SysTick
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* function clock frequency (Fsystick, BOARD_SYSTICK_CLOCK)
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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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* Tips for selecting BOARD_SYSTICKCLKDIV: The resulting reload value
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* should be as large as possible, but must be less than 2^24:
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*
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* SYSTICKDIV > Fmainclk / CLK_TCK / 2^24
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*/
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#define SYSTICK_RELOAD ((BOARD_SYSTICK_CLOCK / CLK_TCK) - 1)
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/* The size of the reload field is 24 bits. Verify that the reload value
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* will fit in the reload register.
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*/
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#if SYSTICK_RELOAD > 0x00ffffff
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# error SYSTICK_RELOAD exceeds the range of the RELOAD register
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#endif
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Function: nrf52_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 nrf52_timerisr(int irq, uint32_t *regs, void *arg)
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{
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/* Process timer interrupt */
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2019-03-21 02:27:40 +01:00
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nxsched_process_timer();
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2018-03-26 18:37:32 +02:00
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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: arm_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 arm_timer_initialize(void)
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{
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uint32_t regval;
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regval = getreg32(NVIC_SYSTICK_CTRL);
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regval &= ~NVIC_SYSTICK_CTRL_CLKSOURCE;
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putreg32(regval, NVIC_SYSTICK_CTRL);
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/* Configure SysTick to interrupt at the requested rate */
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putreg32(SYSTICK_RELOAD, NVIC_SYSTICK_RELOAD);
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/* Attach the timer interrupt vector */
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2020-01-02 17:49:34 +01:00
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irq_attach(NRF52_IRQ_SYSTICK, (xcpt_t)nrf52_timerisr, NULL);
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2018-03-26 18:37:32 +02:00
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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(NRF52_IRQ_SYSTICK);
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}
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