95 lines
3.1 KiB
C
95 lines
3.1 KiB
C
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/**
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* Copyright (c) 2014, Analog Devices, Inc. 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 (subject to the limitations in the
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* disclaimer below) provided that the following conditions are met:
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*
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* - 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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*
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* - 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
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* distribution.
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*
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* - Neither the name of Analog Devices, Inc. nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE
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* GRANTED BY THIS LICENSE. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT
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* HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER 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
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
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* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
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* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* \author Jim Paris <jim.paris@rigado.com>
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*/
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#include <aducrf101-contiki.h>
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#include <sys/clock.h>
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#include <sys/etimer.h>
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static volatile clock_time_t current_clock = 0;
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static volatile unsigned long current_seconds = 0;
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static unsigned int second_countdown = CLOCK_SECOND;
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void
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SysTick_handler(void) __attribute__ ((interrupt));
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void
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SysTick_Handler(void)
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{
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current_clock++;
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if(etimer_pending()) {
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etimer_request_poll();
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}
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if(--second_countdown == 0) {
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current_seconds++;
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second_countdown = CLOCK_SECOND;
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}
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}
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/*---------------------------------------------------------------------------*/
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void
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clock_init()
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{
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SysTick_Config(F_CPU / CLOCK_SECOND);
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}
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/*---------------------------------------------------------------------------*/
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clock_time_t
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clock_time(void)
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{
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return current_clock;
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}
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/*---------------------------------------------------------------------------*/
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unsigned long
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clock_seconds(void)
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{
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return current_seconds;
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}
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/*---------------------------------------------------------------------------*/
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void
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clock_delay_usec(uint16_t usec)
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{
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/* Delay by watching the SysTick value change. */
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int32_t remaining = (int32_t)usec * F_CPU / 1000000;
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int32_t old = SysTick->VAL;
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while(remaining > 0) {
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int32_t new = SysTick->VAL;
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if(new > old) { /* wraparound */
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old += SysTick->LOAD;
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}
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remaining -= (old - new);
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old = new;
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}
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}
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