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/*
* Copyright (c) 2005 Arched Rock Corporation
* 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 Arched Rock Corporation nor the names of its
* 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 ARCHED
* ROCK OR ITS 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.
*/
/**
* Implements a TOS 2.0 Counter on the PXA27x HPL. The PXA27x does not
* have an explicit overflow notification. We emulate one by using
* the associated match register set to 0. This requires we initialize
* the counter to 1 to avoid a false notification at startup.
*
* @author Phil Buonadonna
*/
#include "Timer.h"
generic module HalPXA27xCounterM(typedef frequency_tag, uint8_t resolution)
{
provides {
interface Init;
interface Counter<frequency_tag,uint32_t> as Counter;
interface LocalTime<frequency_tag> as LocalTime;
}
uses {
interface Init as OSTInit;
interface HplPXA27xOSTimer as OSTChnl;
}
}
implementation
{
command error_t Init.init() {
call OSTInit.init();
// Continue on match, Non-periodic, w/ given resolution
atomic {
call OSTChnl.setOMCR(OMCR_C | OMCR_P | OMCR_CRES(resolution));
call OSTChnl.setOSMR(0);
call OSTChnl.setOSCR(1);
call OSTChnl.clearOSSRbit();
call OSTChnl.setOIERbit(TRUE);
}
return SUCCESS;
}
async command uint32_t Counter.get() {
uint32_t cntr;
cntr = call OSTChnl.getOSCR();
return cntr;
}
async command bool Counter.isOverflowPending() {
bool flag;
atomic flag = call OSTChnl.getOSSRbit();
return flag;
}
async command void Counter.clearOverflow() {
atomic call OSTChnl.clearOSSRbit();
}
async event void OSTChnl.fired() {
call OSTChnl.clearOSSRbit();
signal Counter.overflow();
return;
}
async command uint32_t LocalTime.get() {
uint32_t cntr;
cntr = call OSTChnl.getOSCR();
return cntr;
}
default async event void Counter.overflow() {
return;
}
}
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