static int multimeter_read(void) {
double value;
if (fd < 0)
return -1;
if (multimeter_read_value(&value) != 0)
return -1;
multimeter_submit(value);
return 0;
} /* int multimeter_read */
static int multimeter_init (void)
{
char device[] = "/dev/ttyS ";
for (int i = 0; i < 10; i++)
{
device[strlen(device)-1] = i + '0';
if ((fd = open(device, O_RDWR | O_NOCTTY)) != -1)
{
struct termios tios = { 0 };
int rts = TIOCM_RTS;
double value;
tios.c_cflag = B1200 | CS7 | CSTOPB | CREAD | CLOCAL;
tios.c_iflag = IGNBRK | IGNPAR;
tios.c_oflag = 0;
tios.c_lflag = 0;
tios.c_cc[VTIME] = 3;
tios.c_cc[VMIN] = LINE_LENGTH;
tcflush(fd, TCIFLUSH);
tcsetattr(fd, TCSANOW, &tios);
ioctl(fd, TIOCMBIC, &rts);
if (multimeter_read_value (&value) < -1)
{
close (fd);
fd = -1;
}
else
{
INFO ("multimeter plugin: Device "
"found at %s", device);
return (0);
}
}
}
ERROR ("multimeter plugin: No device found");
return (-1);
}