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/*
* Copyright 1996-2002 - Tommy Johnson <tjohnson@bobdbob.com>
*
* This file is part of datalink.
*
* Datalink 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 2 of the License, or
* (at your option) any later version.
*
* Datalink 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 datalink (see COPYING); if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
/*
* Unix implementation of the Timex Datalink protocol using an LED on a serial
* port. (see datalink.ps)
*
* See http://csgrad.cs.vt.edu/~tjohnson/ for more info.
*/
#include <unistd.h>
#include <stdio.h>
#include <fcntl.h>
#include <stdlib.h>
#include <termios.h>
#include <string.h>
#include <sys/time.h>
#include <sys/resource.h>
#ifdef linux
#define cfsetspeed cfsetospeed
#endif
#ifndef PORT
#define PORT "/dev/ttyd1"
#endif
void sendbyte(int fil, unsigned char dat)
#define ZERO "\0xff\0\0\0\0\0"
#define ONE "\0\0\0\0\0\0"
#define LEN 6
{
static int frame = 0;
char buff[1024];
int c = 0;
int i;
memcpy(&buff[c], ZERO, LEN);
c += LEN;
for (i = 0; i < 8; i++)
{
memcpy(&buff[c], (dat & 1) ? ONE : ZERO, LEN);
c += LEN - (i & 1); /* CHEESY! the baud rate dosn't quite */
/* match, so alternate too long and too */
/* short. */
dat >>= 1; /* and... IT WORKS... (shudder) */
}
for (i = 0; i < (frame ? 12 : 4); i++)
{
memcpy(&buff[c], ONE, LEN);
c += LEN;
}
frame = !frame; /* a frame is 2 words, which would have been on */
/* a single CRT frame (different inter-word pause) */
write(fil, buff, c);
}
/* For pauses between packets: */
static void __pause(int fil, int count)
{
char buff[8192];
int i, c;
c = 0;
for (i = 0; i < (count * LEN); i++)
buff[c++] = 0x0;
write(fil, buff, c);
}
#undef ZERO
#undef ONE
#undef LEN
int main(int argc, char **argv)
{
int port;
int data;
struct termios old, new;
int i, j, len, plen;
unsigned char buff[4096];
char fil[1024];
char device[1024];
setpriority(PRIO_PROCESS, 0, -20); /* pauses will screwup the timing */
strcpy(fil, "DEBUGOUTPUT");
strcpy(device, PORT); /* defaults */
#ifdef OTHERCMDLINE
while ((c = getopt(argc, argv, "h?d:f:")) != -1)
{
switch (c)
{
case 'h':
case '?':
fprintf(stderr,
"%s [-d device] [-f file]\n"
"Transmitt a file to a Timex Datalink watch useing an LED on a serial\n"
"port. Timex does not support this product, DO NOT ask them questions about\n"
"it. See http://csgrad.cs.vt.edu/~tjohnson/ for more info.\n"
"Version $Id: serblink.c,v 1.6 2002/07/10 04:14:22 david Exp $\n",
argv[0]);
exit(0);
break;
case 'd':
strcpy(device, optarg);
break;
case 'f':
strcpy(fil, optarg);
break;
}
}
#else
if (argc == 2)
strcpy(fil, argv[1]);
else
{
fprintf(stderr,
"%s file\nTransmitt a file to a Timex Datalink watch useing an LED on a serial\n"
"port. Timex does not support this product, DO NOT ask them questions about\n"
"it. See http://csgrad.cs.vt.edu/~tjohnson/ for more info.\n"
"Version $Id: serblink.c,v 1.6 2002/07/10 04:14:22 david Exp $\n",
argv[0]);
exit(0);
}
#endif
data = open(fil, O_RDONLY);
if (!data)
{
perror("open datafile failed:");
exit(1);
}
len = read(data, buff, 4096);
close(data);
printf("data length:%d\n", len);
port = open(device, O_RDWR);
if (port < 0)
{
perror("open of device failed:");
exit(1);
}
if (tcgetattr(port, &old) < 0)
{
perror("tcgetattr failed:");
exit(1);
}
new = old;
cfsetspeed(&new, B115200);
if (tcsetattr(port, TCSANOW, &new) < 0)
{
perror("tcsetattr failed:");
exit(1);
}
#if 0
while (1)
__pause(port, 20); /* used for hardware debugging */
#endif
printf("sync1\n");
for (i = 0; i < 500; i++)
{
sendbyte(port, 0x55);
if (!(i % 100))
printf("%d\n", 5 - (i / 100));
}
for (i = 0; i < 50; i++)
sendbyte(port, 0xAA);
printf("sync2\n");
i = 0;
do
{
plen = buff[i];
printf("%d\n", plen);
for (j = 0; j < plen; j++)
sendbyte(port, buff[i++]);
if (plen & 1)
sendbyte(port, 0);
__pause(port, 240);
}
while (i < len);
__pause(port, 240);
tcsetattr(port, TCSADRAIN, &new);
sleep(1);
close(port);
return 0;
}
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