ardupilot/libraries/AC_PrecLand/AC_PrecLand_SITL.cpp

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#include <AP_HAL/AP_HAL.h>
#include "AC_PrecLand_SITL.h"
extern const AP_HAL::HAL& hal;
#if CONFIG_HAL_BOARD == HAL_BOARD_SITL
#include <stdio.h>
// init - perform initialisation of this backend
void AC_PrecLand_SITL::init()
{
}
// update - give chance to driver to get updates from sensor
void AC_PrecLand_SITL::update()
{
const uint32_t now = AP_HAL::millis();
if (_los_meas_time_ms + 10 > now) { // 100Hz update
return;
}
// get new sensor data; we always point home
Vector3f home;
if (! AP::ahrs().get_relative_position_NED_home(home)) {
_state.healthy = false;
return;
}
if (home.length() > 10.0f) { // we can see the target out to 10 metres
return;
}
_state.healthy = true;
const Matrix3f &body_to_ned = AP::ahrs().get_rotation_body_to_ned();
_los_meas_body = body_to_ned.mul_transpose(-home);
_los_meas_body /= _los_meas_body.length();
_los_meas_time_ms = now;
}
bool AC_PrecLand_SITL::have_los_meas() {
return AP_HAL::millis() - _los_meas_time_ms < 1000;
}
// provides a unit vector towards the target in body frame
// returns same as have_los_meas()
bool AC_PrecLand_SITL::get_los_body(Vector3f& ret) {
if (AP_HAL::millis() - _los_meas_time_ms > 1000) {
// no measurement for a full second; no vector available
return false;
}
ret = _los_meas_body;
return true;
}
#endif