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/* serial elbug = electronic morse key. */
/* by Günther Montag dl4mge */
/* elbug is distributed alone and as part of the hf package. */
/* Just compile me by 'gcc elbug.c -o elbug' */
/* and copy elbug to user/local/bin. */
/* Call me as root. */
/* How to cable your homebrew elbug? See below! */
/*
* 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 2 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, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*
*/
#include <stdio.h>
#if HAVE_SYS_IO_H
#include <sys/io.h>
#endif
#include <sys/time.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
char *cable = "\n"
"* * * elbug - electronic morse key by dl4mge. How to cable: * * *\n"
"* Middle pad: +9V via Resistor 2 k *\n"
"* Left contact: -> DCD (9-pin plug: 1) (25-pin plug: 8) *\n"
"* Right contact: -> CTS (9-pin plug: 8) (25-pin plug: 5) *\n"
"* Ground: (9-pin plug: 5) (25-pin plug: 7) *\n"
"* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *\n" ;
/* default parameters */
int pin = TIOCM_RTS;
char* name_ptt = "/dev/ttyS0";
int port = 0x3f8;
int invert_ptt = 0;
unsigned int wpm = 12;
int fd_ptt;
int dotus;
void wait(int us) {
struct timeval tv;
tv.tv_sec = 0;
tv.tv_usec = us;
select (0, NULL, NULL, NULL, &tv);
}
void output_elbug_serial(int ptt)
{
if (fd_ptt < 0) {
printf("no serial port open for output.\n");
exit (1);
}
if (ioctl(fd_ptt,
((ptt && !invert_ptt) || (!ptt && invert_ptt)) ?
TIOCMBIS : TIOCMBIC, &pin)) {
printf ("ioctl: TIOCMBI[CS]\n");
printf ( "serial port can not be accessed!\n");
exit (1);
}
}
void elbug_send_dit() {
output_elbug_serial(1);
// printf(".");
wait(dotus);
output_elbug_serial(0);
wait(dotus);
}
void elbug_send_dah() {
output_elbug_serial(1);
// printf("_");
wait(dotus * 3);
output_elbug_serial(0);
wait(dotus);
}
int main(int argc, char *argv[]) {
int c, err = 0;
unsigned short int dcd = 0, cts = 0;
while ((c = getopt(argc, argv, "w:s:di")) != -1) {
switch (c) {
case 's':
name_ptt = optarg;
if (! strcmp (name_ptt, "/dev/ttyS0")) {
port = 0x03F8;
break;
}
if (! strcmp (name_ptt, "/dev/ttyS1")) {
port = 0x02F8;
break;
}
if (! strcmp (name_ptt, "/dev/ttyS2")) {
port = 0x03E8;
break;
}
if (! strcmp (name_ptt, "/dev/ttyS3")) {
port = 0x02E8;
break;
}
break;
case 'd':
pin = TIOCM_DTR;
break;
case 'i':
invert_ptt = 1;
break;
case 'w':
wpm = strtoul(optarg, NULL, 0);
if (wpm < 3 || wpm > 90) {
printf("Speed %d out of range 3...90 wpm\n", wpm);
err++;
}
break;
default:
err++;
break;
}
if (err) {
printf("/* dl4mge's elbug.*/\n"
"usage: elbug [-w <speed wpm>] [-s <ptt comm port>] [-d] [-i] \n"
" -w: speed in wpm (default: 12 words per minute)\n"
" -s: serial port for in/output (default: /dev/ttyS0)\n"
" -d: output through DTR pin (default is RTS)\n"
" -i: invert PTT (default: PTT = positive)\n"
"%s", cable);
exit (0);
}
}
#if HAVE_SYS_IO_H
if ((err = ioperm(port, 8, 1))) {
printf("permission problem for serial port %04x: ioperm = %d\n",
port, err);
printf("This program has to be called with root permissions.\n");
}
#endif
if ((fd_ptt = open(name_ptt, O_RDWR, 0)) < 0) {
printf("error in opening ptt device %s - maybe try another one?\n",
name_ptt);
}
dotus = 1000000 / (wpm * 50 / 60);
printf("%s",cable);
printf("\nelbug: %d wpm at %s, address %04x, %s %s\n",
wpm, name_ptt, port,
invert_ptt ? "inverted ptt output," : "",
pin == TIOCM_DTR ? "DTR output" : "RTS output");
printf("A dit will last %d ms.\n", dotus/1000);
printf("See options by elbug -h. Stop me by <strg>c.\n");
output_elbug_serial(0);
/* main loop */
for (;;) {
#if HAVE_SYS_IO_H
dcd = inb(port + 6) & 128;
cts = inb(port + 6) & 16;
#endif
if (cts) elbug_send_dit();
if (dcd) elbug_send_dah();
wait(3000);
}
}
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