int Send_chars(char *string, int length)
{
int bytes_written = 0;
if(serial_port_fd == -1)
return 0;
/* Normally it never happens, but it is better not to segfault ;) */
if(length == 0)
return 0;
/* RS485 half-duplex mode ? */
if( config.flux==3 )
{
/* set RTS (start to send) */
Set_signals( 1 );
if( config.rs485_rts_time_before_transmit>0 )
usleep(config.rs485_rts_time_before_transmit*1000);
}
bytes_written = write(serial_port_fd, string, length);
/* RS485 half-duplex mode ? */
if( config.flux==3 )
{
/* wait all chars are send */
tcdrain( serial_port_fd );
if( config.rs485_rts_time_after_transmit>0 )
usleep(config.rs485_rts_time_after_transmit*1000);
/* reset RTS (end of send, now receiving back) */
Set_signals( 1 );
}
return bytes_written;
}
int lis_sig(void)
{
static int stat = 0;
int stat_read;
if ( config.flux==3 )
{
//reset RTS (default = receive)
Set_signals( 1 );
}
if(serial_port_fd != -1)
{
if(ioctl(serial_port_fd, TIOCMGET, &stat_read) == -1)
{
/* Ignore EINVAL, as some serial ports
genuinely lack these lines */
/* Thanks to Elie De Brauwer on ubuntu launchpad */
if (errno != EINVAL)
{
i18n_perror(_("Control signals read"));
Close_port();
}
return -2;
}
if(stat_read == stat)
return -1;
stat = stat_read;
return stat;
}
return -1;
}
int main( int argc, char *argv[] )
{
char *buf = NULL;
time_t initial_read_time = 0;
/* Parse command line. */
Parse_command_line( argc, argv );
/* Set up signal handlers */
Set_signals();
/* Set input stream (stdin) to be unbuffered. */
setvbuf( stdin, buf, _IONBF, sizeof( _IONBF ) );
/* Loop/read data. The format of a level-II file is as follows:
24 byte volume header -
bytes 00-08 - file name (AR2V00xx. where xx is LDM version)
bytes 09-11 - volume number sequence (001-999)
bytes 12-15 - volume start date
bytes 16-19 - volume start time (milliseconds after midnight)
bytes 20-23 - ICAO
4 byte flag indicating length compressed meta data record
compressed meta data record
4 byte flag indicating length of compressed radials record
compressed radials record
4 byte flag indicating length of compressed radials record
compressed radials record
.
.
.
*/
/* Note initial start time. */
initial_read_time = time( NULL );
/* Read the initial control word. */
Read_control_word();
P_debug( "control word 1: %d", Control_word );
/* Ensure this is the start of a new volume file. If not, bail. */
Check_for_start_of_volume();
/* Read meta data (first record of new volume file). */
Read_meta_data();
/* Loop and read rest of volume file. */
while( End_of_volume_flag == NO )
{
/* Sanity check. If it takes too long, assume something
bad has happened and bail. */
if( time( NULL ) - initial_read_time > DATA_READ_TIMEOUT )
{
P_err( "Read timeout (>%d). Exiting.", DATA_READ_TIMEOUT );
Print_stats( READ_STDIN_TIMEOUT );
}
/* Read control word that tells us what to do. */
Read_control_word();
P_debug( "control word 2: %d", Control_word );
Read_radial_data();
}
Print_stats( EXIT_SUCCESS );
return 0;
}
