ardupilot/ArduCopter/fence.cpp

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#include "Copter.h"
// Code to integrate AC_Fence library with main ArduCopter code
#if AC_FENCE == ENABLED
// fence_check - ask fence library to check for breaches and initiate the response
// called at 1hz
void Copter::fence_check()
{
const uint8_t orig_breaches = fence.get_breaches();
// check for new breaches; new_breaches is bitmask of fence types breached
const uint8_t new_breaches = fence.check();
// we still don't do anything when disarmed, but we do check for fence breaches.
// fence pre-arm check actually checks if any fence has been breached
// that's not ever going to be true if we don't call check on AP_Fence while disarmed.
if (!motors->armed()) {
return;
}
// if there is a new breach take action
if (new_breaches) {
// if the user wants some kind of response and motors are armed
uint8_t fence_act = fence.get_action();
if (fence_act != AC_FENCE_ACTION_REPORT_ONLY ) {
// disarm immediately if we think we are on the ground or in a manual flight mode with zero throttle
// don't disarm if the high-altitude fence has been broken because it's likely the user has pulled their throttle to zero to bring it down
if (ap.land_complete || (flightmode->has_manual_throttle() && ap.throttle_zero && !failsafe.radio && ((fence.get_breaches() & AC_FENCE_TYPE_ALT_MAX)== 0))){
init_disarm_motors();
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} else {
// if more than 100m outside the fence just force a land
if (fence.get_breach_distance(new_breaches) > AC_FENCE_GIVE_UP_DISTANCE) {
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set_mode(LAND, MODE_REASON_FENCE_BREACH);
} else {
switch (fence_act) {
case AC_FENCE_ACTION_RTL_AND_LAND:
default:
// switch to RTL, if that fails then Land
if (!set_mode(RTL, MODE_REASON_FENCE_BREACH)) {
set_mode(LAND, MODE_REASON_FENCE_BREACH);
}
break;
case AC_FENCE_ACTION_ALWAYS_LAND:
// if always land option mode is specified, land
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set_mode(LAND, MODE_REASON_FENCE_BREACH);
break;
case AC_FENCE_ACTION_SMART_RTL:
// Try SmartRTL, if that fails, RTL, if that fails Land
if (!set_mode(SMART_RTL, MODE_REASON_FENCE_BREACH)) {
if (!set_mode(RTL, MODE_REASON_FENCE_BREACH)) {
set_mode(LAND, MODE_REASON_FENCE_BREACH);
}
}
break;
case AC_FENCE_ACTION_BRAKE:
// Try Brake, if that fails Land
if (!set_mode(BRAKE, MODE_REASON_FENCE_BREACH)) {
set_mode(LAND, MODE_REASON_FENCE_BREACH);
}
break;
}
}
}
}
AP::logger().Write_Error(LogErrorSubsystem::FAILSAFE_FENCE, LogErrorCode(new_breaches));
} else if (orig_breaches) {
// record clearing of breach
AP::logger().Write_Error(LogErrorSubsystem::FAILSAFE_FENCE, LogErrorCode::ERROR_RESOLVED);
}
}
#endif