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186 lines
4.0 KiB
186 lines
4.0 KiB
/*
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Copyright Jeroen Vreeken (jeroen@vreeken.net), 2016
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "interface.h"
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#include <eth_ar/fprs.h>
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#include <eth_ar/eth_ar.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <string.h>
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#include <errno.h>
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#include <math.h>
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#include <time.h>
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#include <sys/select.h>
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#include <gps.h>
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static char *netname = "freedv";
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static void usage(void)
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{
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printf("Options:\n");
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printf("-c [call]\town callsign\n");
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printf("-i [dev]\tNetwork device name (default: \"%s\")\n", netname);
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}
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static uint8_t bcast[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
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static uint8_t myaddr[6];
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static char *symbol = "0F";
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static struct gps_data_t gps = {0};
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static time_t last_update;
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#define UPDATE_INTERVAL 60
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static time_t update_interval = UPDATE_INTERVAL;
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void handle_gps(void)
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{
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struct fprs_frame *frame = fprs_frame_create();
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double speed = 0;
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if (!(gps.set & TIME_SET))
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return;
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if (!(gps.set & STATUS_SET))
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return;
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if (!(gps.set & MODE_SET))
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return;
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// Not needed on eth_ar interfaces
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//fprs_frame_add_callsign(frame, myaddr);
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uint8_t sym[2] = { symbol[0], symbol[1] };
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fprs_frame_add_symbol(frame, sym);
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if (gps.status) {
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fprs_frame_add_timestamp(frame, gps.fix.time);
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printf("%f ", gps.fix.time);
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if (gps.fix.mode >= MODE_2D) {
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fprs_frame_add_position(frame, gps.fix.longitude, gps.fix.latitude, false);
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printf("lat %f lon %f ", gps.fix.latitude, gps.fix.longitude);
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}
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if (gps.fix.mode >= MODE_3D) {
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fprs_frame_add_altitude(frame, gps.fix.altitude);
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printf("atl %f ", gps.fix.altitude);
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double az = gps.fix.track;
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double el = atan(gps.fix.climb / gps.fix.speed) / M_PI * 180.0;
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speed = sqrt(gps.fix.speed * gps.fix.speed + gps.fix.climb * gps.fix.climb);
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fprs_frame_add_vector(frame, az, el, speed);
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printf("az %f el %f speed %f ", az, el, speed);
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}
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}
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update_interval = UPDATE_INTERVAL - speed * 4;
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if (update_interval < 10)
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update_interval = 10;
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gps.set = 0;
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if (time(NULL) < last_update + update_interval)
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goto no_update;
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printf("transmit ");
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uint8_t *data;
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size_t size;
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size = fprs_frame_data_size(frame);
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data = calloc(size, sizeof(uint8_t));
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if (!data)
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goto err_fatal;
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fprs_frame_data_get(frame, data, &size);
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interface_rx_raw(bcast, myaddr, ETH_P_FPRS, data, size);
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free(data);
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last_update = time(NULL);
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err_fatal:
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no_update:
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fprs_frame_destroy(frame);
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printf("\n");
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}
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int main(int argc, char **argv)
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{
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int opt;
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int fd_int;
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char *call = NULL;
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while ((opt = getopt(argc, argv, "c:i:e:s:")) != -1) {
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switch(opt) {
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case 'c':
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call = optarg;
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break;
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case 'i':
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netname = optarg;
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break;
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case 's':
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if (strlen(optarg) >= 2)
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symbol = optarg;
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break;
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default:
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goto err_usage;
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}
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}
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fd_int = interface_init(netname, NULL, false, ETH_P_FPRS);
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if (fd_int < 0) {
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printf("Could not open interface: %s\n", strerror(errno));
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return -1;
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}
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if (!call || eth_ar_callssid2mac(myaddr, call, false)) {
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printf("From callsign could not be converted to a valid MAC address\n");
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goto err_usage;
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}
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//if (gps_open(GPSD_SHARED_MEMORY, NULL, &gps)) {
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if (gps_open("localhost", DEFAULT_GPSD_PORT, &gps)) {
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printf("gps_open failed\n");
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goto err;
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}
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gps_stream(&gps, WATCH_ENABLE, NULL);
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do {
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if (gps_waiting (&gps, 1000000)) {
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int r;
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if ((r = gps_read(&gps, NULL, 0)) < 0) {
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printf("Error reading gps data\n");
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} else {
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handle_gps();
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}
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}
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} while (1);
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gps_close(&gps);
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return 0;
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err:
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err_usage:
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usage();
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return -1;
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}
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