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LibrePilot/flight/modules/ManualControl/armhandler.c

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/**
******************************************************************************
* @addtogroup OpenPilotModules OpenPilot Modules
* @{
* @addtogroup ManualControl
* @brief Interpretes the control input in ManualControlCommand
* @{
*
* @file armhandler.c
* @author The OpenPilot Team, http://www.openpilot.org Copyright (C) 2014.
*
* @see The GNU Public License (GPL) Version 3
*
******************************************************************************/
/*
* This program 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 3 of the License, or
* (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "inc/manualcontrol.h"
#include <sanitycheck.h>
#include <manualcontrolcommand.h>
#include <accessorydesired.h>
#include <flightstatus.h>
#include <flightmodesettings.h>
#include <stabilizationdesired.h>
#ifndef PIOS_EXCLUDE_ADVANCED_FEATURES
#include <statusvtolland.h>
#endif
// Private constants
#define ARMED_THRESHOLD 0.50f
#define GROUND_LOW_THROTTLE 0.01f
// Private types
typedef enum {
ARM_STATE_DISARMED,
ARM_STATE_ARMING_MANUAL,
ARM_STATE_ARMED,
ARM_STATE_DISARMING_MANUAL,
ARM_STATE_DISARMING_TIMEOUT
} ArmState_t;
// Private variables
// Private functions
static void setArmedIfChanged(uint8_t val);
static uint32_t timeDifferenceMs(portTickType start_time, portTickType end_time);
static bool okToArm(void);
static bool forcedDisArm(void);
/**
* @brief Handler to interprete Command inputs in regards to arming/disarming
* @input: ManualControlCommand, AccessoryDesired
* @output: FlightStatus.Arming
*/
void armHandler(bool newinit, FrameType_t frameType)
{
static ArmState_t armState;
if (newinit) {
AccessoryDesiredInitialize();
setArmedIfChanged(FLIGHTSTATUS_ARMED_DISARMED);
armState = ARM_STATE_DISARMED;
}
portTickType sysTime = xTaskGetTickCount();
FlightModeSettingsData settings;
FlightModeSettingsGet(&settings);
ManualControlCommandData cmd;
ManualControlCommandGet(&cmd);
AccessoryDesiredData acc;
bool lowThrottle = cmd.Throttle < 0;
if (frameType == FRAME_TYPE_GROUND) {
// Deadbanding applied in receiver.c typically at 2% but we don't assume its enabled.
lowThrottle = fabsf(cmd.Throttle) < GROUND_LOW_THROTTLE;
}
bool armSwitch = false;
switch (settings.Arming) {
case FLIGHTMODESETTINGS_ARMING_ACCESSORY0:
AccessoryDesiredInstGet(0, &acc);
armSwitch = true;
break;
case FLIGHTMODESETTINGS_ARMING_ACCESSORY1:
AccessoryDesiredInstGet(1, &acc);
armSwitch = true;
break;
case FLIGHTMODESETTINGS_ARMING_ACCESSORY2:
AccessoryDesiredInstGet(2, &acc);
armSwitch = true;
break;
default:
break;
}
// immediate disarm on switch
if (armSwitch && acc.AccessoryVal <= -ARMED_THRESHOLD) {
lowThrottle = true;
}
if (forcedDisArm()) {
// PathPlanner forces explicit disarming due to error condition (crash, impact, fire, ...)
armState = ARM_STATE_DISARMED;
setArmedIfChanged(FLIGHTSTATUS_ARMED_DISARMED);
return;
}
if (settings.Arming == FLIGHTMODESETTINGS_ARMING_ALWAYSDISARMED) {
// In this configuration we always disarm
setArmedIfChanged(FLIGHTSTATUS_ARMED_DISARMED);
return;
}
// The throttle is not low, in case we where arming or disarming, abort
if (!lowThrottle) {
switch (armState) {
case ARM_STATE_DISARMING_MANUAL:
case ARM_STATE_DISARMING_TIMEOUT:
armState = ARM_STATE_ARMED;
break;
case ARM_STATE_ARMING_MANUAL:
armState = ARM_STATE_DISARMED;
break;
default:
// Nothing needs to be done in the other states
break;
}
return;
}
// The rest of these cases throttle is low
if (settings.Arming == FLIGHTMODESETTINGS_ARMING_ALWAYSARMED) {
// In this configuration, we go into armed state as soon as the throttle is low, never disarm
setArmedIfChanged(FLIGHTSTATUS_ARMED_ARMED);
return;
}
// When the configuration is not "Always armed" and no "Always disarmed",
// the state will not be changed when the throttle is not low
static portTickType armedDisarmStart;
float armingInputLevel = 0;
// Calc channel see assumptions7
switch (settings.Arming) {
case FLIGHTMODESETTINGS_ARMING_ROLLLEFT:
armingInputLevel = 1.0f * cmd.Roll;
break;
case FLIGHTMODESETTINGS_ARMING_ROLLRIGHT:
armingInputLevel = -1.0f * cmd.Roll;
break;
case FLIGHTMODESETTINGS_ARMING_PITCHFORWARD:
armingInputLevel = 1.0f * cmd.Pitch;
break;
case FLIGHTMODESETTINGS_ARMING_PITCHAFT:
armingInputLevel = -1.0f * cmd.Pitch;
break;
case FLIGHTMODESETTINGS_ARMING_YAWLEFT:
armingInputLevel = 1.0f * cmd.Yaw;
break;
case FLIGHTMODESETTINGS_ARMING_YAWRIGHT:
armingInputLevel = -1.0f * cmd.Yaw;
break;
case FLIGHTMODESETTINGS_ARMING_ACCESSORY0:
case FLIGHTMODESETTINGS_ARMING_ACCESSORY1:
case FLIGHTMODESETTINGS_ARMING_ACCESSORY2:
armingInputLevel = -1.0f * acc.AccessoryVal;
break;
default:
break;
}
bool manualArm = false;
bool manualDisarm = false;
if (armingInputLevel <= -ARMED_THRESHOLD) {
manualArm = true;
} else if (armingInputLevel >= +ARMED_THRESHOLD) {
manualDisarm = true;
}
switch (armState) {
case ARM_STATE_DISARMED:
setArmedIfChanged(FLIGHTSTATUS_ARMED_DISARMED);
// only allow arming if it's OK too
if (manualArm && okToArm()) {
armedDisarmStart = sysTime;
armState = ARM_STATE_ARMING_MANUAL;
}
break;
case ARM_STATE_ARMING_MANUAL:
setArmedIfChanged(FLIGHTSTATUS_ARMED_ARMING);
if (manualArm && (timeDifferenceMs(armedDisarmStart, sysTime) > settings.ArmingSequenceTime)) {
armState = ARM_STATE_ARMED;
} else if (!manualArm) {
armState = ARM_STATE_DISARMED;
}
break;
case ARM_STATE_ARMED:
// When we get here, the throttle is low,
// we go immediately to disarming due to timeout, also when the disarming mechanism is not enabled
armedDisarmStart = sysTime;
armState = ARM_STATE_DISARMING_TIMEOUT;
setArmedIfChanged(FLIGHTSTATUS_ARMED_ARMED);
break;
case ARM_STATE_DISARMING_TIMEOUT:
{
// we should never reach the disarming timeout if the pathfollower is engaged - reset timeout
FlightStatusControlChainData cc;
FlightStatusControlChainGet(&cc);
if (cc.PathFollower == FLIGHTSTATUS_CONTROLCHAIN_TRUE) {
armedDisarmStart = sysTime;
}
}
// We get here when armed while throttle low, even when the arming timeout is not enabled
if ((settings.ArmedTimeout != 0) && (timeDifferenceMs(armedDisarmStart, sysTime) > settings.ArmedTimeout)) {
armState = ARM_STATE_DISARMED;
}
// Switch to disarming due to manual control when needed
if (manualDisarm) {
armedDisarmStart = sysTime;
armState = ARM_STATE_DISARMING_MANUAL;
}
break;
case ARM_STATE_DISARMING_MANUAL:
// arming switch disarms immediately,
if (manualDisarm && (timeDifferenceMs(armedDisarmStart, sysTime) > settings.DisarmingSequenceTime)) {
armState = ARM_STATE_DISARMED;
} else if (!manualDisarm) {
armState = ARM_STATE_ARMED;
}
break;
} // End Switch
}
static uint32_t timeDifferenceMs(portTickType start_time, portTickType end_time)
{
return (end_time - start_time) * portTICK_RATE_MS;
}
/**
* @brief Determine if the aircraft is safe to arm
* @returns True if safe to arm, false otherwise
*/
static bool okToArm(void)
{
// update checks
configuration_check();
// read alarms
SystemAlarmsData alarms;
SystemAlarmsGet(&alarms);
// Check each alarm
for (int i = 0; i < SYSTEMALARMS_ALARM_NUMELEM; i++) {
if (SystemAlarmsAlarmToArray(alarms.Alarm)[i] >= SYSTEMALARMS_ALARM_CRITICAL) { // found an alarm thats set
if (i == SYSTEMALARMS_ALARM_GPS || i == SYSTEMALARMS_ALARM_TELEMETRY) {
continue;
}
return false;
}
}
StabilizationDesiredStabilizationModeData stabDesired;
FlightStatusData flightStatus;
FlightStatusGet(&flightStatus);
switch (flightStatus.FlightMode) {
case FLIGHTSTATUS_FLIGHTMODE_MANUAL:
case FLIGHTSTATUS_FLIGHTMODE_STABILIZED1:
case FLIGHTSTATUS_FLIGHTMODE_STABILIZED2:
case FLIGHTSTATUS_FLIGHTMODE_STABILIZED3:
case FLIGHTSTATUS_FLIGHTMODE_STABILIZED4:
case FLIGHTSTATUS_FLIGHTMODE_STABILIZED5:
case FLIGHTSTATUS_FLIGHTMODE_STABILIZED6:
// Prevent arming if unsafe due to the current Thrust Mode
StabilizationDesiredStabilizationModeGet(&stabDesired);
if (stabDesired.Thrust == STABILIZATIONDESIRED_STABILIZATIONMODE_ALTITUDEHOLD ||
stabDesired.Thrust == STABILIZATIONDESIRED_STABILIZATIONMODE_ALTITUDEVARIO) {
return false;
}
// avoid assisted control with auto throttle. As it sits waiting to launch,
// it will move to hold, and auto thrust will auto launch otherwise!
if (flightStatus.FlightModeAssist == FLIGHTSTATUS_FLIGHTMODEASSIST_GPSASSIST) {
return false;
}
return true;
break;
case FLIGHTSTATUS_FLIGHTMODE_LAND:
return false;
case FLIGHTSTATUS_FLIGHTMODE_AUTOTAKEOFF:
case FLIGHTSTATUS_FLIGHTMODE_PATHPLANNER:
return true;
default:
return false;
break;
}
}
/**
* @brief Determine if the aircraft is forced to disarm by an explicit alarm
* @returns True if safe to arm, false otherwise
*/
static bool forcedDisArm(void)
{
// read alarms
SystemAlarmsAlarmData alarms;
SystemAlarmsAlarmGet(&alarms);
if (alarms.Guidance == SYSTEMALARMS_ALARM_CRITICAL) {
return true;
}
if (alarms.Receiver == SYSTEMALARMS_ALARM_CRITICAL) {
return true;
}
return false;
}
/**
* @brief Update the flightStatus object only if value changed. Reduces callbacks
* @param[in] val The new value
*/
static void setArmedIfChanged(uint8_t val)
{
FlightStatusData flightStatus;
FlightStatusGet(&flightStatus);
if (flightStatus.Armed != val) {
flightStatus.Armed = val;
FlightStatusSet(&flightStatus);
}
}
/**
* @}
* @}
*/
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