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sdr_beast.c
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sdr_beast.c
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// Part of readsb, a Mode-S/ADSB/TIS message decoder.
//
// sdr_beast.c: Mode-S Beast and GNS5894 support
//
// Copyright (c) 2020 Michael Wolf <michael@mictronics.de>
//
// This file 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 3 of the License, or
// any later version.
//
// This file 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, see <http://www.gnu.org/licenses/>.
#include <termios.h>
#include "readsb.h"
#include "sdr_beast.h"
static struct {
bool filter_df045;
bool filter_df1117;
bool mode_ac;
bool mlat_timestamp;
bool fec;
bool crc;
uint16_t padding;
} BeastSettings;
static void beastSetOption(char opt) {
char optionsmsg[3] = {0x1a, '1', opt};
if (write(Modes.beast_fd, optionsmsg, 3) < 3) {
fprintf(stderr, "Beast failed to set option: %s\n", strerror(errno));
}
}
void beastInitConfig(void) {
free(Modes.beast_serial);
Modes.beast_serial = strdup("/dev/ttyUSB0");
Modes.beast_baudrate = 0;
BeastSettings.filter_df045 = false;
BeastSettings.filter_df1117 = false;
BeastSettings.mode_ac = false;
Modes.mode_ac = 0;
BeastSettings.mlat_timestamp = true;
BeastSettings.fec = true;
BeastSettings.crc = true;
}
bool beastHandleOption(int argc, char *argv) {
switch (argc) {
case OptBeastSerial:
free(Modes.beast_serial);
Modes.beast_serial = strdup(argv);
break;
case OptBeastBaudrate:
Modes.beast_baudrate = (int) strtoll(argv, NULL, 10);
break;
case OptBeastDF1117:
BeastSettings.filter_df1117 = true;
break;
case OptBeastDF045:
BeastSettings.filter_df045 = true;
break;
case OptBeastMlatTimeOff:
BeastSettings.mlat_timestamp = false;
break;
case OptBeastCrcOff:
BeastSettings.crc = false;
break;
case OptBeastFecOff:
BeastSettings.fec = false;
break;
case OptBeastModeAc:
BeastSettings.mode_ac = true;
Modes.mode_ac = 1;
Modes.mode_ac_auto = 0;
break;
}
return true;
}
bool beastOpen(void) {
struct termios tios;
speed_t baud = B3000000;
Modes.beast_fd = open(Modes.beast_serial, O_RDWR | O_NOCTTY);
if (Modes.beast_fd < 0) {
fprintf(stderr, "Failed to open serial device %s: %s\n",
Modes.beast_serial, strerror(errno));
fprintf(stderr, "In case of permission denied try: sudo chmod a+rw %s\nor permanent permission: sudo adduser readsb dialout\n", Modes.beast_serial);
return false;
}
if (tcgetattr(Modes.beast_fd, &tios) < 0) {
fprintf(stderr, "tcgetattr(%s): %s\n", Modes.beast_serial, strerror(errno));
return false;
}
tios.c_iflag = IGNPAR;
tios.c_oflag = 0;
tios.c_lflag = 0;
tios.c_cflag = CS8 | CRTSCTS;
tios.c_cc[VMIN] = 11;
tios.c_cc[VTIME] = 0;
if (Modes.sdr_type == SDR_GNS) {
baud = B921600;
}
if (Modes.beast_baudrate) {
baud = Modes.beast_baudrate;
}
if (cfsetispeed(&tios, baud) < 0) {
fprintf(stderr, "Beast cfsetispeed(%s, %d): %s\n",
Modes.beast_serial, baud, strerror(errno));
return false;
}
if (cfsetospeed(&tios, baud) < 0) {
fprintf(stderr, "Beast cfsetospeed(%s, %d): %s\n",
Modes.beast_serial, baud, strerror(errno));
return false;
}
tcflush(Modes.beast_fd, TCIFLUSH);
if (tcsetattr(Modes.beast_fd, TCSANOW, &tios) < 0) {
fprintf(stderr, "Beast tcsetattr(%s): %s\n",
Modes.beast_serial, strerror(errno));
return false;
}
if (Modes.sdr_type == SDR_MODESBEAST) {
/* set options */
beastSetOption('C'); /* use binary format */
beastSetOption('H'); /* RTS enabled */
if (BeastSettings.filter_df1117)
beastSetOption('D'); /* enable DF11/17-only filter*/
else
beastSetOption('d'); /* disable DF11/17-only filter, deliver all messages */
if (BeastSettings.mlat_timestamp)
beastSetOption('E'); /* enable mlat timestamps */
else
beastSetOption('e'); /* disable mlat timestamps */
if (BeastSettings.crc)
beastSetOption('f'); /* enable CRC checks */
else
beastSetOption('F'); /* disable CRC checks */
if (BeastSettings.filter_df045)
beastSetOption('G'); /* enable DF0/4/5 filter */
else
beastSetOption('g'); /* disable DF0/4/5 filter, deliver all messages */
if (Modes.nfix_crc || BeastSettings.fec)
beastSetOption('i'); /* FEC enabled */
else
beastSetOption('I'); /* FEC disbled */
if (Modes.mode_ac || BeastSettings.mode_ac)
beastSetOption('J'); /* Mode A/C enabled */
else
beastSetOption('j'); /* Mode A/C disabled */
}
// Request firmware message from GNS HULC
if (Modes.sdr_type == SDR_GNS) {
char optionsmsg[4] = {'#', '0', '0', '\r'};
if (write(Modes.beast_fd, optionsmsg, 4) < 4) {
fprintf(stderr, "GNS HULC request firmware failed: %s\n", strerror(errno));
}
}
/* Kick on handshake and start reception */
int RTSDTR_flag = TIOCM_RTS | TIOCM_DTR;
ioctl(Modes.beast_fd, TIOCMBIS, &RTSDTR_flag); //Set RTS&DTR pin
if (Modes.sdr_type == SDR_MODESBEAST) {
fprintf(stderr, "Running Mode-S Beast via USB.\n");
} else {
fprintf(stderr, "Running GNS HULC via USB.\n");
}
return true;
}
void beastRun() {
}
void beastClose() {
/* Beast device will be closed in the main cleanup_and_exit function when
* clients are freed.
*/
}