130 lines
3.4 KiB
C
130 lines
3.4 KiB
C
/*
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* Copyright (c) 2016, The OpenThread Authors.
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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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* 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 copyright holder nor the
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* names of its contributors may be used to endorse or promote products
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* derived 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 HOLDER 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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* This file implements the OpenThread platform abstraction for the alarm.
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*
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*/
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#include <stdbool.h>
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#include <stdint.h>
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#include <openthread-config.h>
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#include <openthread.h>
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#include <platform/platform.h>
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#include <platform/alarm.h>
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#include <platform/diag.h>
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#include "platform-cc2538.h"
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enum
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{
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kSystemClock = 32000000, ///< MHz
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kTicksPerSec = 1000, ///< Ticks per second
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};
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static uint32_t sCounter = 0;
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static uint32_t sAlarmT0 = 0;
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static uint32_t sAlarmDt = 0;
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static bool sIsRunning = false;
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void cc2538AlarmInit(void)
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{
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HWREG(NVIC_ST_RELOAD) = kSystemClock / kTicksPerSec;
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HWREG(NVIC_ST_CTRL) = NVIC_ST_CTRL_CLK_SRC | NVIC_ST_CTRL_INTEN | NVIC_ST_CTRL_ENABLE;
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}
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uint32_t otPlatAlarmGetNow(void)
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{
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return sCounter;
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}
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void otPlatAlarmStartAt(otInstance *aInstance, uint32_t t0, uint32_t dt)
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{
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(void)aInstance;
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sAlarmT0 = t0;
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sAlarmDt = dt;
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sIsRunning = true;
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}
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void otPlatAlarmStop(otInstance *aInstance)
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{
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(void)aInstance;
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sIsRunning = false;
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}
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void cc2538AlarmProcess(otInstance *aInstance)
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{
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uint32_t expires;
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bool fire = false;
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if (sIsRunning)
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{
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expires = sAlarmT0 + sAlarmDt;
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if (sAlarmT0 <= sCounter)
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{
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if (expires >= sAlarmT0 && expires <= sCounter)
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{
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fire = true;
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}
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}
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else
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{
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if (expires >= sAlarmT0 || expires <= sCounter)
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{
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fire = true;
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}
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}
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if (fire)
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{
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sIsRunning = false;
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#if OPENTHREAD_ENABLE_DIAG
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if (otPlatDiagModeGet())
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{
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otPlatDiagAlarmFired(aInstance);
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}
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else
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#endif
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{
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otPlatAlarmFired(aInstance);
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}
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}
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}
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}
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void SysTick_Handler()
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{
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sCounter++;
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}
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