clock-control.h

/*
time-services.h - part of timesignal, a JJY/MSF/WWVB/DCF77
radio transmitter for Raspberry Pi
Copyright (C) 2023 Pierre Brial <p.brial@tethys.re>

Parts of this code is based on txtempus code written by Henner Zeller
Source: https://github.com/hzeller/txtempus
Copyright (C) 2018 Henner Zeller <h.zeller@acm.org>
Licensed under the GNU General Public License, version 3 or later

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <https://www.gnu.org/licenses/>.
*/

#include <inttypes.h>
#include <fcntl.h>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <time.h>
#include <unistd.h>
#include <stdbool.h>

bool GPIO_init();
double StartClock(double requested_freq);
void StopClock();
void EnableClockOutput(bool on);    // Enable clock output on GPIO4