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https://bitbucket.org/librepilot/librepilot.git
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new design of altitude hold - warning not tested yet!
This commit is contained in:
Corvus Corax
parent
a4d53c18ac
commit
623c25aa99
@ -46,39 +46,37 @@
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#include <openpilot.h>
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#include <math.h>
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#include <pid.h>
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#include <CoordinateConversions.h>
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#include <altholdsmoothed.h>
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#include <attitudestate.h>
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#include <altitudeholdsettings.h>
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#include <altitudeholddesired.h> // object that will be updated by the module
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#include <barosensor.h>
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#include <positionstate.h>
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#include <flightstatus.h>
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#include <stabilizationdesired.h>
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#include <accelstate.h>
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#include <taskinfo.h>
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#include <pios_constants.h>
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#include <velocitystate.h>
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#include <positionstate.h>
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// Private constants
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#define MAX_QUEUE_SIZE 2
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#define CALLBACK_PRIORITY CALLBACK_PRIORITY_LOW
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#define CBTASK_PRIORITY CALLBACK_TASK_FLIGHTCONTROL
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#define STACK_SIZE_BYTES 1024
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#define TASK_PRIORITY (tskIDLE_PRIORITY + 1)
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#define ACCEL_DOWNSAMPLE 4
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#define TIMEOUT_TRESHOLD 200000
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#define DESIRED_UPDATE_RATE_MS 100 // milliseconds
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// Private types
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// Private variables
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static xTaskHandle altitudeHoldTaskHandle;
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static xQueueHandle queue;
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static DelayedCallbackInfo *altitudeHoldCBInfo;
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static AltitudeHoldSettingsData altitudeHoldSettings;
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static float throttleAlpha = 1.0f;
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static float throttle_old = 0.0f;
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static struct pid accelpid;
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static float accelStateDown;
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// Private functions
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static void altitudeHoldTask(void *parameters);
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static void altitudeHoldTask(void);
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static void SettingsUpdatedCb(UAVObjEvent *ev);
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static void AccelStateUpdatedCb(UAVObjEvent *ev);
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/**
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* Initialise the module, called on startup
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@ -87,8 +85,8 @@ static void SettingsUpdatedCb(UAVObjEvent *ev);
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int32_t AltitudeHoldStart()
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{
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// Start main task
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xTaskCreate(altitudeHoldTask, (signed char *)"AltitudeHold", STACK_SIZE_BYTES / 4, NULL, TASK_PRIORITY, &altitudeHoldTaskHandle);
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PIOS_TASK_MONITOR_RegisterTask(TASKINFO_RUNNING_ALTITUDEHOLD, altitudeHoldTaskHandle);
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SettingsUpdatedCb(NULL);
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DelayedCallbackDispatch(altitudeHoldCBInfo);
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return 0;
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}
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@ -101,216 +99,111 @@ int32_t AltitudeHoldInitialize()
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{
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AltitudeHoldSettingsInitialize();
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AltitudeHoldDesiredInitialize();
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AltHoldSmoothedInitialize();
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// Create object queue
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queue = xQueueCreate(MAX_QUEUE_SIZE, sizeof(UAVObjEvent));
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altitudeHoldCBInfo = DelayedCallbackCreate(&altitudeHoldTask, CALLBACK_PRIORITY, CBTASK_PRIORITY, STACK_SIZE_BYTES);
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AltitudeHoldSettingsConnectCallback(&SettingsUpdatedCb);
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AccelStateConnectCallback(&AccelStateUpdatedCb);
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return 0;
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}
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MODULE_INITCALL(AltitudeHoldInitialize, AltitudeHoldStart);
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float tau;
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float positionAlpha;
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float velAlpha;
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bool running = false;
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float velocity;
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float velocityIntegral;
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float altitudeIntegral;
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float error;
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float velError;
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float derivative;
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uint32_t timeval;
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bool posUpdated;
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/**
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* Module thread, should not return.
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*/
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static void altitudeHoldTask(__attribute__((unused)) void *parameters)
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static void altitudeHoldTask(void)
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{
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AltitudeHoldDesiredData altitudeHoldDesired;
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StabilizationDesiredData stabilizationDesired;
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AltHoldSmoothedData altHold;
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VelocityStateData velocityData;
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float dT;
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float fblimit = 0;
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portTickType thisTime, lastUpdateTime;
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UAVObjEvent ev;
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static float startThrottle =0.5f;
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dT = 0;
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timeval = 0;
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lastUpdateTime = 0;
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// Force update of the settings
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SettingsUpdatedCb(&ev);
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// Failsafe handling
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uint32_t lastAltitudeHoldDesiredUpdate = 0;
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bool enterFailSafe = false;
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// Listen for updates.
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AltitudeHoldDesiredConnectQueue(queue);
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// PositionStateConnectQueue(queue);
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FlightStatusConnectQueue(queue);
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VelocityStateConnectQueue(queue);
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bool altitudeHoldFlightMode = false;
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running = false;
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enum init_state { WAITING_BARO, WAITIING_INIT, INITED } init = WAITING_BARO;
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// make sure we run only when we are supposed to run
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FlightStatusData flightStatus;
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FlightStatusGet(&flightStatus);
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switch (flightStatus.FlightMode) {
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case FLIGHTSTATUS_FLIGHTMODE_ALTITUDEHOLD:
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case FLIGHTSTATUS_FLIGHTMODE_ALTITUDEVARIO:
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break;
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default:
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pid_zero(&accelpid);
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StabilizationDesiredThrottleGet(&startThrottle);
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DelayedCallbackSchedule(altitudeHoldCBInfo, DESIRED_UPDATE_RATE_MS, CALLBACK_UPDATEMODE_SOONER);
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return;
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break;
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}
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uint8_t flightMode;
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FlightStatusFlightModeGet(&flightMode);
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// initialize enable flag
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altitudeHoldFlightMode = flightMode == FLIGHTSTATUS_FLIGHTMODE_ALTITUDEHOLD || flightMode == FLIGHTSTATUS_FLIGHTMODE_ALTITUDEVARIO;
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// Main task loop
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while (1) {
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enterFailSafe = PIOS_DELAY_DiffuS(lastAltitudeHoldDesiredUpdate) > TIMEOUT_TRESHOLD;
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// Wait until the AttitudeRaw object is updated, if a timeout then go to failsafe
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if (xQueueReceive(queue, &ev, 100 / portTICK_RATE_MS) != pdTRUE) {
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if (!running) {
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altitudeIntegral = 0;
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}
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// do the actual control loop(s)
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AltitudeHoldDesiredData altitudeHoldDesired;
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AltitudeHoldDesiredGet(&altitudeHoldDesired);
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float positionStateDown;
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PositionStateDownGet(&positionStateDown);
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float velocityStateDown;
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VelocityStateDownGet(&velocityStateDown);
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// Todo: Add alarm if it should be running
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continue;
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} else if (ev.obj == FlightStatusHandle()) {
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FlightStatusFlightModeGet(&flightMode);
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altitudeHoldFlightMode = flightMode == FLIGHTSTATUS_FLIGHTMODE_ALTITUDEHOLD || flightMode == FLIGHTSTATUS_FLIGHTMODE_ALTITUDEVARIO;
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if (altitudeHoldFlightMode && !running) {
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AttitudeStateData attitudeState;
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float q[4], Rbe[3][3];
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AttitudeStateGet(&attitudeState);
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q[0] = attitudeState.q1;
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q[1] = attitudeState.q2;
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q[2] = attitudeState.q3;
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q[3] = attitudeState.q4;
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Quaternion2R(q, Rbe);
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// Copy the current throttle as a starting point for integral
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float initThrottle;
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StabilizationDesiredThrottleGet(&initThrottle);
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initThrottle *= Rbe[2][2]; // rotate into earth frame
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if (initThrottle > 1) {
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initThrottle = 1;
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} else if (initThrottle < 0) {
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initThrottle = 0;
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}
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error = 0;
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altitudeHoldDesired.Velocity = 0;
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altitudeHoldDesired.Altitude = altHold.Altitude;
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altitudeIntegral = initThrottle;
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velocityIntegral = 0;
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running = true;
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} else if (!altitudeHoldFlightMode) {
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running = false;
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lastAltitudeHoldDesiredUpdate = PIOS_DELAY_GetRaw();
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}
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} else if (ev.obj == VelocityStateHandle()) {
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init = (init == WAITING_BARO) ? WAITIING_INIT : init;
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dT = 0.1f * PIOS_DELAY_DiffuS(timeval) / 1.0e6f + 0.9f * dT;
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timeval = PIOS_DELAY_GetRaw();
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// altitude control loop
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float velocityDesiredDown = altitudeHoldSettings.AltitudeP * (positionStateDown - altitudeHoldDesired.Altitude) + altitudeHoldDesired.Velocity;
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AltHoldSmoothedGet(&altHold);
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VelocityStateGet(&velocityData);
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altHold.Velocity = -(velAlpha * altHold.Velocity + (1 - velAlpha) * velocityData.Down);
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float position;
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PositionStateDownGet(&position);
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altHold.Altitude = -(positionAlpha * position) + (1 - positionAlpha) * altHold.Altitude;
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AltHoldSmoothedSet(&altHold);
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// Verify that we are in altitude hold mode
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uint8_t armed;
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FlightStatusArmedGet(&armed);
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if (!altitudeHoldFlightMode || armed != FLIGHTSTATUS_ARMED_ARMED) {
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running = false;
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}
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if (!running) {
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lastAltitudeHoldDesiredUpdate = PIOS_DELAY_GetRaw();
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continue;
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}
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float lastError = error;
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error = altitudeHoldDesired.Altitude - altHold.Altitude;
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derivative = (error - lastError) / dT;
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velError = altitudeHoldDesired.Velocity - altHold.Velocity;
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// Compute altitude and velocity integral
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altitudeIntegral += (error - fblimit) * altitudeHoldSettings.AltitudePID[ALTITUDEHOLDSETTINGS_ALTITUDEPID_KI] * dT;
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velocityIntegral += (velError - fblimit) * altitudeHoldSettings.VelocityPI[ALTITUDEHOLDSETTINGS_VELOCITYPI_KI] * dT;
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// velocity control loop
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float realAccelDesired = altitudeHoldSettings.VelocityP * (velocityStateDown - velocityDesiredDown) -9.81f;
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thisTime = xTaskGetTickCount();
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// Only update stabilizationDesired less frequently
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if ((thisTime - lastUpdateTime) * 1000 / configTICK_RATE_HZ < DESIRED_UPDATE_RATE_MS) {
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continue;
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}
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lastUpdateTime = thisTime;
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// compensate acceleration by rotation
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// explanation: Rbe[2][2] is the Down component of a 0,0,1 vector rotated by Attitude.Q
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// It is 1.0 for no rotation, 0.0 for a 90 degrees roll or pitch and -1.0 for a 180 degrees flipped rotation
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// multiplying with 1/Rbe[2][2] therefore is the acceleration/thrust required to overcome gravity and achieve the wanted vertical
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// acceleration at the current tilt angle.
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// around 90 degrees rotation this is infinite (since no possible acceleration would get us up or down) so we set the error to zero to keep
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// integrals from winding in any direction
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AttitudeStateData attitudeState;
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AttitudeStateGet(&attitudeState);
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float Rbe[3][3];
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Quaternion2R(&attitudeState.q1,Rbe);
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float rotatedAccelDesired = realAccelDesired;
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if (fabsf(Rbe[2][2])>1e-3f) {
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rotatedAccelDesired /= Rbe[2][2];
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} else {
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rotatedAccelDesired = accelStateDown;
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}
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// acceleration control loop
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float throttle = startThrottle + pid_apply_setpoint(&accelpid, 1.0f, rotatedAccelDesired, accelStateDown, 1000/DESIRED_UPDATE_RATE_MS);
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// Instead of explicit limit on integral you output limit feedback
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StabilizationDesiredGet(&stabilizationDesired);
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if (!enterFailSafe) {
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stabilizationDesired.Throttle = altitudeIntegral + velocityIntegral
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+ error * altitudeHoldSettings.AltitudePID[ALTITUDEHOLDSETTINGS_ALTITUDEPID_KP]
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+ velError * altitudeHoldSettings.VelocityPI[ALTITUDEHOLDSETTINGS_VELOCITYPI_KP]
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+ derivative * altitudeHoldSettings.AltitudePID[ALTITUDEHOLDSETTINGS_ALTITUDEPID_KD];
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if (throttle>=1.0f) {
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throttle=1.0f;
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}
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if (throttle<=0.0f) {
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throttle=0.0f;
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}
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StabilizationDesiredData stab;
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StabilizationDesiredGet(&stab);
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stab.Roll = altitudeHoldDesired.Roll;
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stab.Pitch = altitudeHoldDesired.Pitch;
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stab.Yaw = altitudeHoldDesired.Yaw;
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stab.Throttle = throttle;
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stab.StabilizationMode.Roll = STABILIZATIONDESIRED_STABILIZATIONMODE_ATTITUDE;
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stab.StabilizationMode.Pitch = STABILIZATIONDESIRED_STABILIZATIONMODE_ATTITUDE;
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stab.StabilizationMode.Yaw = STABILIZATIONDESIRED_STABILIZATIONMODE_AXISLOCK;
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StabilizationDesiredSet(&stab);
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// scale up throttle to compensate for roll/pitch angle but limit this to 60 deg (cos(60) == 0.5) to prevent excessive scaling
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AttitudeStateData attitudeState;
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float q[4], Rbe[3][3];
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AttitudeStateGet(&attitudeState);
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q[0] = attitudeState.q1;
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q[1] = attitudeState.q2;
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q[2] = attitudeState.q3;
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q[3] = attitudeState.q4;
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Quaternion2R(q, Rbe);
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float throttlescale = Rbe[2][2] < 0.5f ? 0.5f : Rbe[2][2];
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stabilizationDesired.Throttle /= throttlescale;
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stabilizationDesired.Throttle = stabilizationDesired.Throttle * throttleAlpha + throttle_old * (1.0f - throttleAlpha);
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throttle_old = stabilizationDesired.Throttle;
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fblimit = 0;
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DelayedCallbackSchedule(altitudeHoldCBInfo, DESIRED_UPDATE_RATE_MS, CALLBACK_UPDATEMODE_SOONER);
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}
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if (stabilizationDesired.Throttle > 1) {
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fblimit = stabilizationDesired.Throttle - 1;
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stabilizationDesired.Throttle = 1;
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} else if (stabilizationDesired.Throttle < 0) {
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fblimit = stabilizationDesired.Throttle;
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stabilizationDesired.Throttle = 0;
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}
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} else {
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// shutdown motors
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stabilizationDesired.Throttle = -1;
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}
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stabilizationDesired.StabilizationMode.Roll = STABILIZATIONDESIRED_STABILIZATIONMODE_ATTITUDE;
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stabilizationDesired.StabilizationMode.Pitch = STABILIZATIONDESIRED_STABILIZATIONMODE_ATTITUDE;
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stabilizationDesired.StabilizationMode.Yaw = STABILIZATIONDESIRED_STABILIZATIONMODE_AXISLOCK;
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stabilizationDesired.Roll = altitudeHoldDesired.Roll;
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stabilizationDesired.Pitch = altitudeHoldDesired.Pitch;
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stabilizationDesired.Yaw = altitudeHoldDesired.Yaw;
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StabilizationDesiredSet(&stabilizationDesired);
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} else if (ev.obj == AltitudeHoldDesiredHandle()) {
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// reset the failsafe timer
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lastAltitudeHoldDesiredUpdate = PIOS_DELAY_GetRaw();
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AltitudeHoldDesiredGet(&altitudeHoldDesired);
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}
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}
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static void AccelStateUpdatedCb(__attribute__((unused)) UAVObjEvent *ev)
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{
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float down;
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AccelStatezGet(&down);
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accelStateDown = down * altitudeHoldSettings.AccelAlpha + accelStateDown * (1.0f - altitudeHoldSettings.AccelAlpha);
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}
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static void SettingsUpdatedCb(__attribute__((unused)) UAVObjEvent *ev)
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{
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AltitudeHoldSettingsGet(&altitudeHoldSettings);
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positionAlpha = expf(-(1000.0f / 666.0f * ACCEL_DOWNSAMPLE) / altitudeHoldSettings.PositionTau);
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velAlpha = expf(-(1000.0f / 666.0f * ACCEL_DOWNSAMPLE) / altitudeHoldSettings.VelocityTau);
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// don't use throttle filter if specified cutoff frequency is too low or above nyquist criteria (half the sampling frequency)
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if (altitudeHoldSettings.ThrottleFilterCutoff > 0.001f && altitudeHoldSettings.ThrottleFilterCutoff < 2000.0f / DESIRED_UPDATE_RATE_MS) {
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throttleAlpha = (float)DESIRED_UPDATE_RATE_MS / ((float)DESIRED_UPDATE_RATE_MS + 1000.0f / (2.0f * M_PI_F * altitudeHoldSettings.ThrottleFilterCutoff));
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} else {
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throttleAlpha = 1.0f;
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}
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pid_configure(&accelpid, altitudeHoldSettings.AccelPI.Kp, altitudeHoldSettings.AccelPI.Kp, 0, altitudeHoldSettings.AccelPI.Ilimit);
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pid_zero(&accelpid);
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accelStateDown=0.0f;
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}
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@ -887,10 +887,10 @@ static void altitudeHoldDesired(ManualControlCommandData *cmd, bool changed)
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} else if (cmd->Throttle > DEADBAND_HIGH && zeroed) {
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// being the two band symmetrical I can divide by DEADBAND_LOW to scale it to a value betweeon 0 and 1
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// then apply an "exp" f(x,k) = (k*x*x*x + (255-k)*x) / 255
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altitudeHoldDesiredData.Velocity = (throttleExp * powf((cmd->Throttle - DEADBAND_HIGH) / (DEADBAND_LOW), 3) + (255 - throttleExp) * (cmd->Throttle - DEADBAND_HIGH) / DEADBAND_LOW) / 255 * throttleRate;
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altitudeHoldDesiredData.Velocity = -((throttleExp * powf((cmd->Throttle - DEADBAND_HIGH) / (DEADBAND_LOW), 3) + (255 - throttleExp) * (cmd->Throttle - DEADBAND_HIGH) / DEADBAND_LOW) / 255 * throttleRate);
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altitudeHoldDesiredData.Altitude = posState.Down;
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} else if (cmd->Throttle < DEADBAND_LOW && zeroed) {
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altitudeHoldDesiredData.Velocity = -(throttleExp * powf((DEADBAND_LOW - (cmd->Throttle < 0 ? 0 : cmd->Throttle)) / DEADBAND_LOW, 3) + (255 - throttleExp) * (DEADBAND_LOW - cmd->Throttle) / DEADBAND_LOW) / 255 * throttleRate;
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altitudeHoldDesiredData.Velocity = -(-(throttleExp * powf((DEADBAND_LOW - (cmd->Throttle < 0 ? 0 : cmd->Throttle)) / DEADBAND_LOW, 3) + (255 - throttleExp) * (DEADBAND_LOW - cmd->Throttle) / DEADBAND_LOW) / 255 * throttleRate);
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altitudeHoldDesiredData.Altitude = posState.Down;
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} else if (cmd->Throttle >= DEADBAND_LOW && cmd->Throttle <= DEADBAND_HIGH && (throttleRate != 0)) {
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// Require the stick to enter the dead band before they can move height
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@ -1,13 +1,12 @@
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<xml>
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<object name="AltitudeHoldSettings" singleinstance="true" settings="true" category="Control">
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<description>Settings for the @ref AltitudeHold module</description>
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<field name="AltitudePID" units="throttle/m" type="float" elementnames="Kp,Ki,Kd" defaultvalue="0.18,0.06,0.01"/>
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<field name="VelocityPI" units="throttle/m" type="float" elementnames="Kp,Ki" defaultvalue="0.1,0.1"/>
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<field name="VelocityTau" units="" type="float" elements="1" defaultvalue="0.5"/>
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<field name="PositionTau" units="" type="float" elements="1" defaultvalue="0.5"/>
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<field name="ThrottleFilterCutoff" units="Hz" type="float" elements="1" defaultvalue="2"/>
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<field name="ThrottleExp" units="" type="uint8" elements="1" defaultvalue="128"/>
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<field name="ThrottleRate" units="m/s" type="uint8" elements="1" defaultvalue="5"/>
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<field name="AltitudeP" units="(m/s)/m" type="float" elements="1" defaultvalue="2" />
|
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<field name="VelocityP" units="(m/s^2)/(m/s)" type="float" elements="1" defaultvalue="0.5" />
|
||||
<field name="AccelPI" units="throttle/(m/s^2)" type="float" elementnames="Kp,Ki,Ilimit" defaultvalue="0.1,0.01,1.0" />
|
||||
<field name="AccelAlpha" units="" type="float" elements="1" defaultvalue="0.1" />
|
||||
<field name="ThrottleExp" units="" type="uint8" elements="1" defaultvalue="128" />
|
||||
<field name="ThrottleRate" units="m/s" type="uint8" elements="1" defaultvalue="5" />
|
||||
<access gcs="readwrite" flight="readwrite"/>
|
||||
<telemetrygcs acked="true" updatemode="onchange" period="0"/>
|
||||
<telemetryflight acked="true" updatemode="onchange" period="0"/>
|
||||
|
||||
Loading…
Reference in New Issue
Block a user