sntp-lwip2.cpp

/*
 * sntp-lwip2.c - ESP8266-specific functions for SNTP and lwIP-v2
 * Copyright (c) 2015 Espressif (license is tools/sdk/lwip/src/core/sntp.c's)
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * 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. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
 *
 *
 * History:
 * This code is extracted from lwip1.4-espressif's sntp.c
 * which is a patched version of the original lwip1's sntp.
 * (check the mix-up in tools/sdk/lwip/src/core/sntp.c)
 * It is moved here as-is and cleaned for maintainability and
 * because it does not belong to lwip.
 *
 * TODOs:
 * settimeofday(): handle tv->tv_usec
 * sntp_mktm_r(): review, fix DST handling (this one is currently untouched from lwip-1.4)
 * implement adjtime()
 */

#include <lwip/init.h>
#include <time.h>
#include <sys/time.h>
#include <errno.h>
#include <osapi.h>
#include <os_type.h>
#include "coredecls.h"
#include "Schedule.h"

static TrivialCB _settimeofday_cb;

void settimeofday_cb (TrivialCB&& cb)
{
    _settimeofday_cb = std::move(cb);
}

void settimeofday_cb (const TrivialCB& cb)
{
    _settimeofday_cb = cb;
}

extern "C" {

#include <lwip/apps/sntp.h>

uint32_t sntp_real_timestamp = 0;
LOCAL os_timer_t sntp_timer;

void ICACHE_RAM_ATTR sntp_time_inc (void)
{
    sntp_real_timestamp++;
}

int settimeofday(const struct timeval* tv, const struct timezone* tz)
{
    if (tz || !tv)
        // tz is obsolete (cf. man settimeofday)
        return EINVAL;

    // reset time subsystem
    tune_timeshift64(tv->tv_sec * 1000000ULL + tv->tv_usec);

    sntp_real_timestamp = tv->tv_sec;
    os_timer_disarm(&sntp_timer);
    os_timer_setfn(&sntp_timer, (os_timer_func_t *)sntp_time_inc, NULL);
    os_timer_arm(&sntp_timer, 1000, 1);

    if (_settimeofday_cb)
        schedule_recurrent_function_us([](){ _settimeofday_cb(); return false; }, 0);

    return 0;
}

};