114 lines
3.2 KiB
C
114 lines
3.2 KiB
C
/*
|
|
* Copyright (c) 2008 Swedish Institute of Computer Science
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are met:
|
|
*
|
|
* * Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* * Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in
|
|
* the documentation and/or other materials provided with the
|
|
* distribution.
|
|
* * Neither the name of the copyright holders nor the names of
|
|
* contributors may be used to endorse or promote products derived
|
|
* from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
|
|
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
/**
|
|
* \file
|
|
*
|
|
* \brief
|
|
* This file will configure the timer during LCD operation.
|
|
*
|
|
* \author
|
|
* Mike Vidales mavida404@gmail.com
|
|
*
|
|
*/
|
|
|
|
#include "lcd.h"
|
|
#include "timer.h"
|
|
|
|
/**
|
|
* \addtogroup lcd
|
|
* \{
|
|
*/
|
|
|
|
bool timer_flag;
|
|
|
|
/*---------------------------------------------------------------------------*/
|
|
|
|
/**
|
|
* \brief TIMER1 init for timer used by LCD.
|
|
*
|
|
* The FPU of 8MHz with a prescaler of 1024 equals 7812.5 timer ticks creating a
|
|
* resolution of 128us per tick.
|
|
*
|
|
* NOTE: The TIMER1 interrupt is not enabled in this routine
|
|
*/
|
|
void
|
|
timer_init(void)
|
|
{
|
|
/*
|
|
* Set TIMER1 output compare mode to clear on compare match for OC1A. Also
|
|
* set the pre-scaler to 1024.
|
|
*/
|
|
TCCR1B = (1 << WGM12)|(1 << CS12)|(1 << CS10);
|
|
|
|
/* Set TIMER1 output compare register approx. 1 sec resolution. */
|
|
OCR1A = _1_SEC;
|
|
}
|
|
|
|
/*---------------------------------------------------------------------------*/
|
|
|
|
/**
|
|
* \brief Start the timer.
|
|
*/
|
|
void
|
|
timer_start(void)
|
|
{
|
|
/* Clear TIMER1 timer counter value. */
|
|
TCNT1 = 0;
|
|
|
|
/* Enable TIMER1 output compare interrupt. */
|
|
TIMSK1 = (1 << OCIE1A);
|
|
}
|
|
|
|
/*---------------------------------------------------------------------------*/
|
|
|
|
/**
|
|
* \brief Stop the timer.
|
|
*/
|
|
void
|
|
timer_stop(void)
|
|
{
|
|
/* Disable TIMER1 output compare interrupt. */
|
|
TIMSK1 &= ~(1 << OCIE1A);
|
|
}
|
|
|
|
/*---------------------------------------------------------------------------*/
|
|
|
|
/**
|
|
* \brief This is the interrupt subroutine for the TIMER1 output match comparison.
|
|
*/
|
|
ISR
|
|
(TIMER1_COMPA_vect)
|
|
{
|
|
/* Set the irq flag. */
|
|
timer_flag = true;
|
|
}
|
|
|
|
/** \} */
|