WSJT-X/ptt_unix.c

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/*
* WSJT is Copyright (c) 2001-2006 by Joseph H. Taylor, Jr., K1JT,
* and is licensed under the GNU General Public License (GPL).
*/
#include <unistd.h>
#include <stdio.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#if (defined(__unix__) || defined(unix)) && !defined(USG)
#include <sys/param.h>
#endif
/* First cut, note that this only distinguishes Linux from BSDs,
* it will be done better later on using configure. N.B. that OSX
* will come up as BSD but I think this is also the right serial port
* for OSX. -db
*/
#if defined(BSD)
#define TTYNAME "/dev/ttyd%d"
#else
#include <sys/io.h>
#define TTYNAME "/dev/ttyS%d"
#endif
/* Not quite right for size but '%d + 1' should be plenty enough -db */
#define TTYNAME_SIZE sizeof(TTYNAME)+1
int ptt_(int *nport, int *ntx, int *iptt)
{
static int nopen=0;
int control = TIOCM_RTS | TIOCM_DTR;
int fd;
char s[TTYNAME_SIZE];
if(*nport < 0) {
*iptt=*ntx;
return(0);
}
if(*ntx && (!nopen)) {
snprintf(s, TTYNAME_SIZE, TTYNAME, *nport);
s[TTYNAME_SIZE] = '\0';
//open the device
if ((fd = open(s, O_RDWR | O_NDELAY)) < 0) {
fprintf(stderr, "device not found");
return(1);
}
nopen=1;
return(0);
}
if(*ntx && nopen) {
// printf("Set DTR/RTS %d %d\n",TIOCMBIS,control);
ioctl(fd, TIOCMBIS, &control); // Set DTR and RTS
*iptt=1;
}
else {
// printf("Clear DTR/RTS %d %d\n",TIOCMBIC,control);
ioctl(fd, TIOCMBIC, &control);
close(fd);
*iptt=0;
nopen=0;
}
return(0);
}