e_identification_fr.c

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/*
 * Copyright (C) Fabien Bonneval
 *
 * This file is part of paparazzi
 *
 * paparazzi 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 2, or (at your option)
 * any later version.
 *
 * paparazzi 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 paparazzi; see the file COPYING.  If not, see
 * <http://www.gnu.org/licenses/>.
 */
#include "modules/e_identification_fr/e_identification_fr.h"
#include "state.h"
#include "mcu_periph/uart.h"
#include "modules/gps/gps.h"
#include "generated/airframe.h"
#include "generated/flight_plan.h"
 
#if defined(ROTORCRAFT_FIRMWARE)
#include "modules/nav/waypoints.h"
#endif
 
#define MAX_BUF_LEN 50
 
 
static struct uart_periph *dev = &(E_ID_DEV);
bool e_identification_started = false;
 
static int put_lat(uint8_t *buf)
{
  int32_t lat = stateGetPositionLla_i()->lat / 1e2;
  int32_t belat = __builtin_bswap32(lat);
  buf[0] = E_ID_LAT;
  buf[1] = sizeof(belat);
  memcpy(buf + 2, &belat, sizeof(belat));
  return sizeof(belat) + 2;
}
 
static int put_lon(uint8_t *buf)
{
  int32_t lon = stateGetPositionLla_i()->lon / 1e2;
  int32_t belon = __builtin_bswap32(lon);
  buf[0] = E_ID_LON;
  buf[1] = sizeof(belon);
  memcpy(buf + 2, &belon, sizeof(belon));
  return sizeof(belon) + 2;
}
 
static int put_alt(uint8_t *buf)
{
  int16_t alt = gps.hmsl / 1e3;
  int16_t bealt = __builtin_bswap16(alt);
  buf[0] = E_ID_HMSL;
  buf[1] = sizeof(bealt);
  memcpy(buf + 2, &bealt, sizeof(bealt));
  return sizeof(bealt) + 2;
}
 
static int put_horizontal_speed(uint8_t *buf)
{
  uint8_t speed = (uint8_t) stateGetHorizontalSpeedNorm_f();
  buf[0] = E_ID_H_SPEED;
  buf[1] = sizeof(speed);
  memcpy(buf + 2, &speed, sizeof(speed));
  return sizeof(speed) + 2;
}
 
static int put_route(uint8_t *buf)
{
  int32_t route_normalized = DegOfRad(stateGetHorizontalSpeedDir_f());
  uint16_t route;
  if (route_normalized >= 0) {
    route = (uint16_t) route_normalized;
  } else {
    route = (uint16_t)(360 + route_normalized);
  }
  uint16_t beroute = __builtin_bswap16(route);
  buf[0] = E_ID_ROUTE;
  buf[1] = sizeof(beroute);
  memcpy(buf + 2, &beroute, sizeof(beroute));
  return sizeof(beroute) + 2;
}
 
static int put_lat_lon_home(uint8_t *buf)
{
  struct LlaCoor_i *ptr_home_lla_i;
#if defined(FIXEDWING_FIRMWARE)
  struct LlaCoor_i home_lla_i;
  struct LlaCoor_f home_lla_f;
  struct UtmCoor_f home_utm_f;
 
  home_utm_f.east = nav_utm_east0 +  waypoints[WP_HOME].x;
  home_utm_f.north = nav_utm_north0 + waypoints[WP_HOME].y;
  home_utm_f.zone = nav_utm_zone0;
  home_utm_f.alt = 0;    // don't care about the altitude
 
  lla_of_utm_f(&home_lla_f, &home_utm_f);
  LLA_BFP_OF_REAL(home_lla_i, home_lla_f);
  ptr_home_lla_i = &home_lla_i;
 
 
#elif defined(ROTORCRAFT_FIRMWARE)
  ptr_home_lla_i = waypoint_get_lla(WP_HOME);
#else
#error  Not a fixedwing or a rotorcraft, not yet supported
#endif
 
  int32_t lat_home = ptr_home_lla_i->lat / 1e2;
  int32_t lon_home = ptr_home_lla_i->lon / 1e2;
  int32_t belat_home = __builtin_bswap32(lat_home);
  int32_t belon_home = __builtin_bswap32(lon_home);
 
  int offset = 0;
  buf[offset++] = E_ID_LAT_TO;
  buf[offset++] = sizeof(belat_home);
  memcpy(buf + offset, &belat_home, sizeof(belat_home));
  offset += sizeof(belat_home);
 
  buf[offset++] = E_ID_LON_TO;
  buf[offset++] = sizeof(belon_home);
  memcpy(buf + offset, &belon_home, sizeof(belon_home));
  offset += sizeof(belon_home);
 
  return offset;
}
 
void e_identification_fr_init()
{
}
 
 
void e_identification_fr_periodic()
{
#if defined(FIXEDWING_FIRMWARE)
  if (autopilot.launch) {
#elif defined(ROTORCRAFT_FIRMWARE)
  if (autopilot_in_flight()) {
#else
#error "firmware unsupported!"
#endif
    e_identification_started = true;
  }
  
  if (GpsFixValid() && e_identification_started) {
    uint8_t buf[MAX_BUF_LEN];
    buf[0] = 0X99;  //PPRZ_STX
    buf[1] = 0;   //filled later with message length
    uint8_t offset = 2;
 
    offset += put_lat(buf + offset);
    offset += put_lon(buf + offset);
    offset += put_alt(buf + offset);
    offset += put_lat_lon_home(buf + offset);
    offset += put_route(buf + offset);
    offset += put_horizontal_speed(buf + offset);
 
    buf[1] = offset + 2;  //include from STX to checksum_b
 
    uint8_t ck_a = 0;
    uint8_t ck_b = 0;
    for (int i = 1; i < offset; i++) {
      ck_a += buf[i];
      ck_b += ck_a;
    }
    buf[offset++] = ck_a;
    buf[offset++] = ck_b;
 
    uart_put_buffer(dev, 0, buf, offset);
  }
}