jcs.org
Utility to set the time on a Hayes Stack Chronograph
Initial import
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LICENSE
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LICENSE
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Copyright (c) 2021 joshua stein <jcs@jcs.org>
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Permission to use, copy, modify, and distribute this software for any
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purpose with or without fee is hereby granted, provided that the above
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copyright notice and this permission notice appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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Makefile
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Makefile
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# vim:ts=8
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CC ?= cc
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CFLAGS ?= -O2
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CFLAGS += -Wall -Wunused -Wmissing-prototypes -Wstrict-prototypes -Wunused
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PREFIX ?= /usr/local
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BINDIR ?= $(PREFIX)/bin
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MANDIR ?= $(PREFIX)/man/man1
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INSTALL_PROGRAM ?= install -s
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INSTALL_DATA ?= install
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PROG = chronosync
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OBJS = chronosync.o
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all: $(PROG)
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$(PROG): $(OBJS)
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$(CC) $(OBJS) $(LDPATH) $(LIBS) -o $@
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$(OBJS): *.c
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$(CC) $(CFLAGS) $(INCLUDES) -c $< -o $@
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install: all
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mkdir -p $(DESTDIR)$(BINDIR)
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$(INSTALL_PROGRAM) $(PROG) $(DESTDIR)$(BINDIR)
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clean:
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rm -f $(PROG) $(OBJS)
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.PHONY: all install clean
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README.md
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README.md
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## chronosync
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A small utility to set the clock on a
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[Hayes Stack Chronograph](http://atari8bitads.blogspot.com/2017/06/theres-no-better-time.html)
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over its serial port.
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### Synopsis
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chronosync [-d] [-s serial speed] <serial device>
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### Compiling
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Compile with a BSD Make:
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$ make
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Install:
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# make install
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Run and pass argument of the serial device connected to the Chronograph:
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# chronosync /dev/cua02
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The computer's local time is sent to the Chronograph.
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### Notes
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Since the Chronograph only supports setting the time to minute precision with
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`ATST`, `chronosync` will sleep until zero seconds of the next minute before
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sending the time.
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The clock on the Chronograph will probably only need to be set once per day to
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stay accurate, so running this from cron once a day should suffice:
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# sync time at 2am
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1 59 * * * /usr/local/bin/chronosync /dev/cua02
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chronosync.c
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chronosync.c
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/*
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* Copyright (c) 2021 joshua stein <jcs@jcs.org>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <poll.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <termios.h>
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#include <time.h>
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#include <unistd.h>
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#include <vis.h>
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#include <sys/ioctl.h>
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#include <sys/time.h>
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#include <sys/types.h>
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static int debug = 0;
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static char vbuf[512];
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static int serial_fd = -1;
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void usage(const char *);
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void serial_setup(int, speed_t);
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size_t serial_read(void *, size_t);
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size_t serial_write(const void *, size_t);
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void
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usage(const char *progname)
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{
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fprintf(stderr, "usage: %s [-d] [-s serial speed] <serial device>\n",
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progname);
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exit(1);
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}
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void
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serial_setup(int fd, speed_t speed)
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{
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struct termios tty;
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if (ioctl(fd, TIOCEXCL) != 0)
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err(1, "ioctl(TIOCEXCL)");
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if (tcgetattr(fd, &tty) < 0)
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err(1, "tcgetattr");
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tty.c_cflag |= CREAD;
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tty.c_cflag &= ~CSIZE;
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tty.c_cflag |= CS8; /* 8-bit characters */
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tty.c_cflag &= ~PARENB; /* no parity bit */
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tty.c_cflag &= ~CSTOPB; /* only need 1 stop bit */
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/* setup for non-canonical mode */
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tty.c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP | INLCR | IGNCR | ICRNL | IXON);
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tty.c_lflag &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN);
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tty.c_oflag &= ~OPOST;
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/* fetch bytes as they become available */
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tty.c_cc[VMIN] = 1;
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tty.c_cc[VTIME] = 1;
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cfsetspeed(&tty, speed);
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if (tcsetattr(fd, TCSAFLUSH, &tty) != 0)
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err(1, "tcsetattr");
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}
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size_t
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serial_read(void *buf, size_t nbytes)
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{
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size_t ret;
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ret = read(serial_fd, buf, nbytes);
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if (debug && ret > 0) {
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strvisx(vbuf, buf, ret, VIS_NL | VIS_CSTYLE | VIS_OCTAL);
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printf("<<< %s\n", vbuf);
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}
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return ret;
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}
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size_t
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serial_write(const void *buf, size_t nbytes)
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{
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if (debug) {
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strvisx(vbuf, buf, nbytes, VIS_NL | VIS_CSTYLE | VIS_OCTAL);
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printf(">>> %s\n", vbuf);
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}
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return write(serial_fd, buf, nbytes);
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}
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int
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main(int argc, char *argv[])
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{
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struct timeval tp;
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struct tm *tm;
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char *serial_dev = NULL;
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char buf[64];
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int serial_speed = B1200;
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int ch;
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if (argc == 1)
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usage(argv[0]);
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while ((ch = getopt(argc, argv, "ds:")) != -1) {
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switch (ch) {
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case 'd':
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debug = 1;
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break;
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case 's':
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serial_speed = (unsigned)strtol(optarg, NULL, 0);
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if (errno)
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err(1, "invalid serial port speed value");
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break;
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default:
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usage(argv[0]);
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}
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}
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argc -= optind;
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argv += optind;
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if (argc == 0)
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usage(argv[0]);
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serial_dev = argv[0];
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serial_fd = open(serial_dev, O_RDWR|O_SYNC);
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if (serial_fd < 0)
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err(1, "open %s", serial_dev);
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serial_setup(serial_fd, serial_speed);
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for (;;) {
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gettimeofday(&tp, NULL);
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tm = localtime(&tp.tv_sec);
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if (debug)
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printf("currently: %02d:%02d:%02d\n", tm->tm_hour,
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tm->tm_min, tm->tm_sec);
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if (tm->tm_sec == 0) {
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if (debug)
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printf("setting chronograph to %02d%02d00\n",
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tm->tm_hour, tm->tm_min);
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sprintf(buf, "\rATST%02d%02d00\r", tm->tm_hour,
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tm->tm_min);
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serial_write(buf, strlen(buf));
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break;
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} else {
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usleep(500000); /* half a sec */
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}
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}
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close(serial_fd);
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return 0;
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}