drivers/AVR/timer_AVR.c
author greg
Wed, 16 Sep 2009 15:15:28 +0200
changeset 587 c175351a6994
parent 375 03fb0bfccc1f
child 801 32d146b64a35
permissions -rw-r--r--
fix warnings with msvc compiler
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/*
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This file is part of CanFestival, a library implementing CanOpen Stack.
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Copyright (C): Edouard TISSERANT and Francis DUPIN
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AVR Port: Andreas GLAUSER and Peter CHRISTEN
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See COPYING file for copyrights details.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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*/
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// AVR implementation of the  CANopen timer driver, uses Timer 3 (16 bit)
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// Includes for the Canfestival driver
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#include "canfestival.h"
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#include "timer.h"
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// Define the timer registers
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#define TimerAlarm        OCR3B
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#define TimerCounter      TCNT3
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/************************** Modul variables **********************************/
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// Store the last timer value to calculate the elapsed time
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static TIMEVAL last_time_set = TIMEVAL_MAX;     
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void initTimer(void)
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/******************************************************************************
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Initializes the timer, turn on the interrupt and put the interrupt time to zero
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INPUT	void
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OUTPUT	void
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******************************************************************************/
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{
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  TimerAlarm = 0;		// Set it back to the zero
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	// Set timer 3 for CANopen operation tick 8us max, time is 524ms
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  TCCR3B = 1 << CS31 | 1 << CS30;       // Timer 3 normal, mit CK/64
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  TIMSK3 = 1 << OCIE3B;                 // Enable the interrupt
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}
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void setTimer(TIMEVAL value)
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/******************************************************************************
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Set the timer for the next alarm.
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INPUT	value TIMEVAL (unsigned long)
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OUTPUT	void
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******************************************************************************/
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{
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  TimerAlarm += (int)value;	// Add the desired time to timer interrupt time
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}
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TIMEVAL getElapsedTime(void)
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/******************************************************************************
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Return the elapsed time to tell the Stack how much time is spent since last call.
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INPUT	void
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OUTPUT	value TIMEVAL (unsigned long) the elapsed time
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******************************************************************************/
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{
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  unsigned int timer = TimerCounter;            // Copy the value of the running timer
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  if (timer > last_time_set)                    // In case the timer value is higher than the last time.
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    return (timer - last_time_set);             // Calculate the time difference
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  else if (timer < last_time_set)
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    return (last_time_set - timer);             // Calculate the time difference
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  else
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    return TIMEVAL_MAX;
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}
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#ifdef  __IAR_SYSTEMS_ICC__
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#pragma type_attribute = __interrupt
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#pragma vector=TIMER3_COMPB_vect
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void TIMER3_COMPB_interrupt(void)
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#else	// GCC
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ISR(TIMER3_COMPB_vect)
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#endif	// GCC
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/******************************************************************************
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Interruptserviceroutine Timer 3 Compare B for the CAN timer
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******************************************************************************/
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{
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  last_time_set = TimerCounter;
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  TimeDispatch();                               // Call the time handler of the stack to adapt the elapsed time
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}
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