ardupilot/ArduSub/sensors.cpp

74 lines
2.6 KiB
C++

#include "Sub.h"
// return barometric altitude in centimeters
void Sub::read_barometer()
{
barometer.update();
// If we are reading a positive altitude, the sensor needs calibration
// Even a few meters above the water we should have no significant depth reading
if(barometer.get_altitude() > 0) {
barometer.update_calibration();
}
if (ap.depth_sensor_present) {
sensor_health.depth = barometer.healthy(depth_sensor_idx);
}
}
void Sub::init_rangefinder()
{
#if RANGEFINDER_ENABLED == ENABLED
rangefinder.init(ROTATION_PITCH_270);
rangefinder_state.alt_cm_filt.set_cutoff_frequency(RANGEFINDER_WPNAV_FILT_HZ);
rangefinder_state.enabled = rangefinder.has_orientation(ROTATION_PITCH_270);
#endif
}
// return rangefinder altitude in centimeters
void Sub::read_rangefinder()
{
#if RANGEFINDER_ENABLED == ENABLED
rangefinder.update();
rangefinder_state.alt_healthy = ((rangefinder.status_orient(ROTATION_PITCH_270) == RangeFinder::Status::Good) && (rangefinder.range_valid_count_orient(ROTATION_PITCH_270) >= RANGEFINDER_HEALTH_MAX));
int16_t temp_alt = rangefinder.distance_cm_orient(ROTATION_PITCH_270);
#if RANGEFINDER_TILT_CORRECTION == ENABLED
// correct alt for angle of the rangefinder
temp_alt = (float)temp_alt * MAX(0.707f, ahrs.get_rotation_body_to_ned().c.z);
#endif
rangefinder_state.alt_cm = temp_alt;
// filter rangefinder for use by AC_WPNav
uint32_t now = AP_HAL::millis();
if (rangefinder_state.alt_healthy) {
if (now - rangefinder_state.last_healthy_ms > RANGEFINDER_TIMEOUT_MS) {
// reset filter if we haven't used it within the last second
rangefinder_state.alt_cm_filt.reset(rangefinder_state.alt_cm);
} else {
rangefinder_state.alt_cm_filt.apply(rangefinder_state.alt_cm, 0.05f);
}
rangefinder_state.last_healthy_ms = now;
}
// send rangefinder altitude and health to waypoint navigation library
const float terrain_offset_cm = inertial_nav.get_position_z_up_cm() - rangefinder_state.alt_cm_filt.get();
wp_nav.set_rangefinder_terrain_offset(rangefinder_state.enabled, rangefinder_state.alt_healthy, terrain_offset_cm);
circle_nav.set_rangefinder_terrain_offset(rangefinder_state.enabled && wp_nav.rangefinder_used(), rangefinder_state.alt_healthy, terrain_offset_cm);
#else
rangefinder_state.enabled = false;
rangefinder_state.alt_healthy = false;
rangefinder_state.alt_cm = 0;
#endif
}
// return true if rangefinder_alt can be used
bool Sub::rangefinder_alt_ok() const
{
return (rangefinder_state.enabled && rangefinder_state.alt_healthy);
}