114 lines
3.2 KiB
C
114 lines
3.2 KiB
C
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/*
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* Copyright (c) 2008 Swedish Institute of Computer Science
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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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* * 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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* * 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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* * Neither the name of the copyright holders nor the names of
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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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* 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 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 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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/**
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* \file
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*
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* \brief
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* This file will configure the timer during LCD operation.
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*
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* \author
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* Mike Vidales mavida404@gmail.com
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*
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*/
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#include "lcd.h"
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#include "timer.h"
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/**
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* \addtogroup lcd
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* \{
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*/
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bool timer_flag;
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/*---------------------------------------------------------------------------*/
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/**
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* \brief TIMER1 init for timer used by LCD.
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*
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* The FPU of 8MHz with a prescaler of 1024 equals 7812.5 timer ticks creating a
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* resolution of 128us per tick.
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*
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* NOTE: The TIMER1 interrupt is not enabled in this routine
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*/
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void
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timer_init(void)
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{
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/*
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* Set TIMER1 output compare mode to clear on compare match for OC1A. Also
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* set the pre-scaler to 1024.
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*/
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TCCR1B = (1 << WGM12)|(1 << CS12)|(1 << CS10);
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/* Set TIMER1 output compare register approx. 1 sec resolution. */
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OCR1A = _1_SEC;
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}
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/*---------------------------------------------------------------------------*/
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/**
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* \brief Start the timer.
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*/
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void
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timer_start(void)
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{
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/* Clear TIMER1 timer counter value. */
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TCNT1 = 0;
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/* Enable TIMER1 output compare interrupt. */
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TIMSK1 = (1 << OCIE1A);
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}
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/*---------------------------------------------------------------------------*/
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/**
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* \brief Stop the timer.
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*/
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void
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timer_stop(void)
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{
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/* Disable TIMER1 output compare interrupt. */
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TIMSK1 &= ~(1 << OCIE1A);
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}
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/*---------------------------------------------------------------------------*/
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/**
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* \brief This is the interrupt subroutine for the TIMER1 output match comparison.
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*/
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ISR
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(TIMER1_COMPA_vect)
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{
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/* Set the irq flag. */
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timer_flag = true;
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}
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/** \} */
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