diff options
Diffstat (limited to 'serblink.c')
| -rw-r--r-- | serblink.c | 208 |
1 files changed, 208 insertions, 0 deletions
diff --git a/serblink.c b/serblink.c new file mode 100644 index 0000000..9ca9fdc --- /dev/null +++ b/serblink.c @@ -0,0 +1,208 @@ +/* + * 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; +} |