104 lines
3.2 KiB
C
104 lines
3.2 KiB
C
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/*
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* Copyright (c) 2014, Ralf Schlatterbeck Open Source Consulting
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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
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* are met:
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* 1. 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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* 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. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* 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 INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*/
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/**
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* \addgroup hardware timer
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*
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* @{
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*/
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/**
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* \file
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* Header file for hardware timer of AVR microcontrollers
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* \author
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* Ralf Schlatterbeck <rsc@runtux.com>
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*/
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#include <avr/pgmspace.h>
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#include "contiki.h"
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#include "rtimer-arch.h"
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#include "hw_timer.h"
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#ifndef PLAT_TIMER
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#define PLAT_TIMER 0xFF /* invalid timer for comparison */
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#endif
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int8_t hwtimer_ini (uint8_t timer, uint8_t wgm, uint8_t clock, uint16_t maxt)
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{
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int8_t i;
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HWT_CHECK_TIMER (timer);
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if (wgm > HWT_WGM_MASK || wgm == HWT_WGM_RESERVED) {
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return HWT_ERR_INVALID_WGM;
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}
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if (clock > HWT_CLOCK_MASK) {
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return HWT_ERR_INVALID_CLOCK;
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}
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/* Turn off clock, no need to disable interrupt */
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*HWT_TCCRB (timer) &= ~HWT_CLOCK_MASK;
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*HWT_TCCRA (timer) &= ~(HWT_WGM_MASK_LOW << HWT_WGM_SHIFT_LOW);
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*HWT_TCCRA (timer) |= ((wgm & HWT_WGM_MASK_LOW) << HWT_WGM_SHIFT_LOW);
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*HWT_TCCRB (timer) &= ~(HWT_WGM_MASK_HIGH << HWT_WGM_SHIFT_HIGH);
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*HWT_TCCRB (timer) |= ((wgm & HWT_WGM_MASK_HIGH) << HWT_WGM_SHIFT_HIGH);
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for (i=0; i<3; i++) {
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HWT_SET_COM (timer, i, HWT_COM_NORMAL);
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}
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if ( wgm == HWT_WGM_PWM_PHASE_FRQ_ICR
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|| wgm == HWT_WGM_PWM_PHASE_ICR
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|| wgm == HWT_WGM_CTC_ICR
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|| wgm == HWT_WGM_PWM_FAST_ICR
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)
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{
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*HWT_ICR (timer) = maxt;
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}
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if ( wgm == HWT_WGM_CTC_OCRA
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|| wgm == HWT_WGM_PWM_PHASE_FRQ_OCRA
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|| wgm == HWT_WGM_PWM_PHASE_OCRA
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|| wgm == HWT_WGM_PWM_FAST_OCRA
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)
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{
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*HWT_OCRA (timer) = maxt;
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}
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/* Set clock, finally */
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*HWT_TCCRB (timer) |= clock;
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return 0;
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}
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/*
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* ex:ts=8:et:sw=2
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*/
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/** @} */
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