mirror of
https://github.com/merbanan/rtl_433.git
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58 lines
1.4 KiB
C
58 lines
1.4 KiB
C
/** @file
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Generic RF data receiver and decoder for ISM band devices using RTL-SDR and SoapySDR.
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Copyright (C) 2026 Christian W. Zuckschwerdt <zany@triq.net>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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*/
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#include "delay_timer.h"
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#include <stdio.h>
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#include <time.h>
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#ifndef _MSC_VER
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#include <unistd.h>
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#endif
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#ifdef _WIN32
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#include <windows.h>
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#define usleep(us) Sleep((us) / 1000)
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#endif
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void delay_timer_init(delay_timer_t *delay_timer)
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{
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// set to current wall clock
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int ret = gettimeofday(delay_timer, NULL);
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if (ret) {
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perror("gettimeofday");
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}
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}
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void delay_timer_wait(delay_timer_t *delay_timer, unsigned delay_us)
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{
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// sync to wall clock
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struct timeval now_tv;
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int ret = gettimeofday(&now_tv, NULL);
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if (ret) {
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perror("gettimeofday");
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}
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time_t elapsed_s = now_tv.tv_sec - delay_timer->tv_sec;
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time_t elapsed_us = 1000000 * elapsed_s + now_tv.tv_usec - delay_timer->tv_usec;
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// set next wanted start time
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delay_timer->tv_usec += delay_us;
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while (delay_timer->tv_usec > 1000000) {
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delay_timer->tv_usec -= 1000000;
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delay_timer->tv_sec += 1;
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}
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if ((time_t)delay_us > elapsed_us) {
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usleep(delay_us - elapsed_us);
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}
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}
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