examples/platforms/da15000/alarm.c

/*
 *  Copyright (c) 2016, The OpenThread Authors.
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 *  1. Redistributions of source code must retain the above copyright
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 *  2. 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.
 *  3. Neither the name of the copyright holder 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
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 */

/**
* @file alarm.c
* Platform abstraction for the alarm
*/

#include <openthread/config.h>

#include <stdbool.h>
#include <stdint.h>

#include <openthread/platform/alarm.h>

#include "hw_timer0.h"
#include "hw_gpio.h"
#include "platform-da15000.h"

static bool sIsRunning = false;
static uint32_t sAlarm = 0;
static uint32_t sCounter;
volatile bool sAlarmFired = false;

static void timer0_interrupt_cb(void)
{
    sCounter++;
}

void da15000AlarmProcess(otInstance *aInstance)
{
    if ((sIsRunning) && (sAlarm <= sCounter))
    {
        sIsRunning = false;
        otPlatAlarmFired(aInstance);
    }
}

void da15000AlarmInit(void)
{
    hw_timer0_init(NULL);
    hw_timer0_set_clock_source(HW_TIMER0_CLK_SRC_FAST);
    hw_timer0_set_pwm_mode(HW_TIMER0_MODE_PWM);
    hw_timer0_set_fast_clock_div(HW_TIMER0_FAST_CLK_DIV_4);
    hw_timer0_set_t0_reload(0x07D0, 0x07D0);
    hw_timer0_register_int(timer0_interrupt_cb);
    hw_timer0_set_on_clock_div(false);
}

uint32_t otPlatAlarmGetNow(void)
{
    return sCounter;
}

void otPlatAlarmStartAt(otInstance *aInstance, uint32_t t0, uint32_t dt)
{
    (void)aInstance;
    sAlarm = t0 + dt;
    sIsRunning = true;

    if (sCounter == 0)
    {
        hw_timer0_enable();
    }


    if (sIsRunning == false)
    {
        sIsRunning = true;
    }

    hw_timer0_unfreeze();
}

void otPlatAlarmStop(otInstance *aInstance)
{
    (void)aInstance;
    sIsRunning = false;
    hw_timer0_freeze();
}