125 lines
3.6 KiB
C
125 lines
3.6 KiB
C
/*
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* Copyright (c) 2020, Alex Taradov <alex@taradov.com>
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* All rights reserved.
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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 are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* 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 the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN 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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/*- Includes ----------------------------------------------------------------*/
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#include <stdlib.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include "same70.h"
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#include "timer.h"
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/*- Variables ---------------------------------------------------------------*/
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static Timer *g_timer_list[TIMER_COUNT];
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/*- Implementations ---------------------------------------------------------*/
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//-----------------------------------------------------------------------------
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static inline void systick_start(void)
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{
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SysTick->CTRL = SysTick_CTRL_ENABLE_Msk | SysTick_CTRL_TICKINT_Msk;
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}
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//-----------------------------------------------------------------------------
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static inline void systick_stop(void)
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{
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SysTick->CTRL = 0;
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}
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//-----------------------------------------------------------------------------
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void timer_init(void)
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{
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SysTick->VAL = 0;
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SysTick->LOAD = (F_CPU / 1000) * TIMER_TICK;
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for (int i = 0; i < TIMER_COUNT; i++)
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g_timer_list[i] = NULL;
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systick_start();
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}
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//-----------------------------------------------------------------------------
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void timer_start(Timer *timer)
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{
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timer->expired = false;
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timer->interval = (timer->interval < TIMER_TICK) ? TIMER_TICK : timer->interval;
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timer->timeout = timer->interval / TIMER_TICK;
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systick_stop();
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for (int i = 0; i < TIMER_COUNT; i++)
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{
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if (g_timer_list[i] == NULL)
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{
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g_timer_list[i] = timer;
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break;
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}
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}
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systick_start();
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}
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//-----------------------------------------------------------------------------
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void timer_stop(Timer *timer)
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{
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systick_stop();
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for (int i = 0; i < TIMER_COUNT; i++)
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{
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if (g_timer_list[i] == timer)
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{
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g_timer_list[i] = NULL;
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break;
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}
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}
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systick_start();
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}
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//-----------------------------------------------------------------------------
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void irq_handler_sys_tick(void)
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{
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for (int i = 0; i < TIMER_COUNT; i++)
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{
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Timer *timer = g_timer_list[i];
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if (timer == NULL)
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continue;
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if (--timer->timeout > 0)
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continue;
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timer->expired = true;
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if (timer->repeat)
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timer->timeout = timer->interval / TIMER_TICK;
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else
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g_timer_list[i] = NULL;
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}
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}
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