ardupilot/ArduCopter/events.cpp

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// -*- tab-width: 4; Mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*-
#include "Copter.h"
/*
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* This event will be called when the failsafe changes
* boolean failsafe reflects the current state
*/
void Copter::failsafe_radio_on_event()
{
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// if motors are not armed there is nothing to do
if( !motors.armed() ) {
return;
}
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// This is how to handle a failsafe.
switch(control_mode) {
case STABILIZE:
case ACRO:
// if throttle is zero OR vehicle is landed disarm motors
if (ap.throttle_zero || ap.land_complete) {
init_disarm_motors();
// if failsafe_throttle is FS_THR_ENABLED_ALWAYS_LAND then land immediately
}else if(g.failsafe_throttle == FS_THR_ENABLED_ALWAYS_LAND) {
set_mode_land_with_pause();
// if far from home then RTL
} else if(home_distance > FS_CLOSE_TO_HOME_CM) {
// switch to RTL or if that fails, LAND
set_mode_RTL_or_land_with_pause();
// We have no GPS or are very close to home so we will land
}else{
set_mode_land_with_pause();
}
break;
case AUTO:
// if mission has not started AND vehicle is landed, disarm motors
if (!ap.auto_armed && ap.land_complete) {
init_disarm_motors();
// if failsafe_throttle is FS_THR_ENABLED_ALWAYS_LAND then land immediately
} else if(g.failsafe_throttle == FS_THR_ENABLED_ALWAYS_LAND) {
set_mode_land_with_pause();
// if failsafe_throttle is FS_THR_ENABLED_ALWAYS_RTL do RTL
} else if (g.failsafe_throttle == FS_THR_ENABLED_ALWAYS_RTL) {
if (home_distance > FS_CLOSE_TO_HOME_CM) {
// switch to RTL or if that fails, LAND
set_mode_RTL_or_land_with_pause();
}else{
// We are very close to home so we will land
set_mode_land_with_pause();
}
}
// failsafe_throttle must be FS_THR_ENABLED_CONTINUE_MISSION so no need to do anything
break;
case LAND:
// continue to land if battery failsafe is also active otherwise fall through to default handling
if (g.failsafe_battery_enabled == FS_BATT_LAND && failsafe.battery) {
break;
}
// no break
default:
// used for AltHold, Guided, Loiter, RTL, Circle, Drift, Sport, Flip, Autotune, PosHold
// if landed disarm
if (ap.land_complete) {
init_disarm_motors();
// if failsafe_throttle is FS_THR_ENABLED_ALWAYS_LAND then land immediately
} else if(g.failsafe_throttle == FS_THR_ENABLED_ALWAYS_LAND) {
set_mode_land_with_pause();
// if far from home then RTL
} else if(home_distance > FS_CLOSE_TO_HOME_CM) {
// switch to RTL or if that fails, LAND
set_mode_RTL_or_land_with_pause();
}else{
// We have no GPS or are very close to home so we will land
set_mode_land_with_pause();
}
break;
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}
// log the error to the dataflash
Log_Write_Error(ERROR_SUBSYSTEM_FAILSAFE_RADIO, ERROR_CODE_FAILSAFE_OCCURRED);
}
// failsafe_off_event - respond to radio contact being regained
// we must be in AUTO, LAND or RTL modes
// or Stabilize or ACRO mode but with motors disarmed
void Copter::failsafe_radio_off_event()
{
// no need to do anything except log the error as resolved
// user can now override roll, pitch, yaw and throttle and even use flight mode switch to restore previous flight mode
Log_Write_Error(ERROR_SUBSYSTEM_FAILSAFE_RADIO, ERROR_CODE_FAILSAFE_RESOLVED);
}
void Copter::failsafe_battery_event(void)
{
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// return immediately if low battery event has already been triggered
if (failsafe.battery) {
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return;
}
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// failsafe check
if (g.failsafe_battery_enabled != FS_BATT_DISABLED && motors.armed()) {
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switch(control_mode) {
case STABILIZE:
case ACRO:
// if throttle is zero OR vehicle is landed disarm motors
if (ap.throttle_zero || ap.land_complete) {
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init_disarm_motors();
}else{
// set mode to RTL or LAND
if (g.failsafe_battery_enabled == FS_BATT_RTL && home_distance > FS_CLOSE_TO_HOME_CM) {
// switch to RTL or if that fails, LAND
set_mode_RTL_or_land_with_pause();
}else{
set_mode_land_with_pause();
}
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}
break;
case AUTO:
// if mission has not started AND vehicle is landed, disarm motors
if (!ap.auto_armed && ap.land_complete) {
init_disarm_motors();
// set mode to RTL or LAND
} else if (home_distance > FS_CLOSE_TO_HOME_CM) {
// switch to RTL or if that fails, LAND
set_mode_RTL_or_land_with_pause();
} else {
set_mode_land_with_pause();
}
break;
default:
// used for AltHold, Guided, Loiter, RTL, Circle, Drift, Sport, Flip, Autotune, PosHold
// if landed disarm
if (ap.land_complete) {
init_disarm_motors();
// set mode to RTL or LAND
} else if (g.failsafe_battery_enabled == FS_BATT_RTL && home_distance > FS_CLOSE_TO_HOME_CM) {
// switch to RTL or if that fails, LAND
set_mode_RTL_or_land_with_pause();
} else {
set_mode_land_with_pause();
}
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break;
}
}
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// set the low battery flag
set_failsafe_battery(true);
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// warn the ground station and log to dataflash
gcs_send_text(MAV_SEVERITY_CRITICAL,"Low Battery!");
Log_Write_Error(ERROR_SUBSYSTEM_FAILSAFE_BATT, ERROR_CODE_FAILSAFE_OCCURRED);
}
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// failsafe_gcs_check - check for ground station failsafe
void Copter::failsafe_gcs_check()
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{
uint32_t last_gcs_update_ms;
// return immediately if gcs failsafe is disabled, gcs has never been connected or we are not overriding rc controls from the gcs and we are not in guided mode
// this also checks to see if we have a GCS failsafe active, if we do, then must continue to process the logic for recovery from this state.
if ((!failsafe.gcs)&&(g.failsafe_gcs == FS_GCS_DISABLED || failsafe.last_heartbeat_ms == 0 || (!failsafe.rc_override_active && control_mode != GUIDED))) {
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return;
}
// calc time since last gcs update
// note: this only looks at the heartbeat from the device id set by g.sysid_my_gcs
last_gcs_update_ms = millis() - failsafe.last_heartbeat_ms;
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// check if all is well
if (last_gcs_update_ms < FS_GCS_TIMEOUT_MS) {
// check for recovery from gcs failsafe
if (failsafe.gcs) {
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failsafe_gcs_off_event();
set_failsafe_gcs(false);
}
return;
}
// do nothing if gcs failsafe already triggered or motors disarmed
if (failsafe.gcs || !motors.armed()) {
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return;
}
// GCS failsafe event has occured
// update state, log to dataflash
set_failsafe_gcs(true);
Log_Write_Error(ERROR_SUBSYSTEM_FAILSAFE_GCS, ERROR_CODE_FAILSAFE_OCCURRED);
// clear overrides so that RC control can be regained with radio.
hal.rcin->clear_overrides();
failsafe.rc_override_active = false;
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// This is how to handle a failsafe.
// use the throttle failsafe setting to decide what to do
switch(control_mode) {
case STABILIZE:
case ACRO:
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case SPORT:
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// if throttle is zero disarm motors
if (ap.throttle_zero || ap.land_complete) {
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init_disarm_motors();
}else if(home_distance > FS_CLOSE_TO_HOME_CM) {
// switch to RTL or if that fails, LAND
set_mode_RTL_or_land_with_pause();
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}else{
// We have no GPS or are very close to home so we will land
set_mode_land_with_pause();
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}
break;
case AUTO:
// if mission has not started AND vehicle is landed, disarm motors
if (!ap.auto_armed && ap.land_complete) {
init_disarm_motors();
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// if g.failsafe_gcs is 1 do RTL, 2 means continue with the mission
} else if (g.failsafe_gcs == FS_GCS_ENABLED_ALWAYS_RTL) {
if (home_distance > FS_CLOSE_TO_HOME_CM) {
// switch to RTL or if that fails, LAND
set_mode_RTL_or_land_with_pause();
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}else{
// We are very close to home so we will land
set_mode_land_with_pause();
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}
}
// if failsafe_throttle is 2 (i.e. FS_THR_ENABLED_CONTINUE_MISSION) no need to do anything
break;
default:
// used for AltHold, Guided, Loiter, RTL, Circle, Drift, Sport, Flip, Autotune, PosHold
// if landed disarm
if (ap.land_complete) {
init_disarm_motors();
} else if (home_distance > FS_CLOSE_TO_HOME_CM) {
// switch to RTL or if that fails, LAND
set_mode_RTL_or_land_with_pause();
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}else{
// We have no GPS or are very close to home so we will land
set_mode_land_with_pause();
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}
break;
}
}
// failsafe_gcs_off_event - actions to take when GCS contact is restored
void Copter::failsafe_gcs_off_event(void)
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{
// log recovery of GCS in logs?
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Log_Write_Error(ERROR_SUBSYSTEM_FAILSAFE_GCS, ERROR_CODE_FAILSAFE_RESOLVED);
}
// set_mode_RTL_or_land_with_pause - sets mode to RTL if possible or LAND with 4 second delay before descent starts
// this is always called from a failsafe so we trigger notification to pilot
void Copter::set_mode_RTL_or_land_with_pause()
{
// attempt to switch to RTL, if this fails then switch to Land
if (!set_mode(RTL)) {
// set mode to land will trigger mode change notification to pilot
set_mode_land_with_pause();
} else {
// alert pilot to mode change
AP_Notify::events.failsafe_mode_change = 1;
}
}
void Copter::update_events()
{
ServoRelayEvents.update_events();
}