Subversion Repositories FlightCtrl

#include <inttypes.h>

#include "analog.h"

#include "attitude.h"

#include "configuration.h"

#include "controlMixer.h"

// for digital / LED debug.

#include "output.h"

// For scope debugging only!

#include "rc.h"

#define INTEGRAL_LIMIT 100000

#define LATCH_TIME 3

// This will translate a height value to a target height in centimeters.

// Currently: One step is 50 cm and zero is 5 meters below the takeoff altitude. With max. 255 steps the max.

// target height is then about 120m.

#define HEIGHT_GAIN 50L

#define HEIGHT_FORMULA(x) ((x) * HEIGHT_GAIN - 500L)

int32_t setHeight;

int32_t targetHeight;

uint16_t hc_testOscPrescaler = 0;

uint8_t hc_testOscTimer = 0;

int32_t maxHeightThisFlight;

int32_t iHeight;

void HC_setGround(void) {

  analog_setGround();

  // This should also happen when height control is enabled in-flight.

  setHeight = targetHeight = analog_getHeight();

  hc_testOscTimer = 0;

  maxHeightThisFlight = 0;

  iHeight = 0;

}

uint8_t HC_isSwitchOn(void) {

  return (dynamicParams.heightSetting >= 255/3);

}

void HC_periodicTask(void) {

  int32_t height = analog_getHeight();

  static uint8_t setHeightLatch = 0;

  if (height > maxHeightThisFlight)

    maxHeightThisFlight = height;

  // debugOut.analog[25] = dynamicParams.heightSetting;

  if (staticParams.bitConfig & CFG_SIMPLE_HC_HOLD_SWITCH) {

    if (HC_isSwitchOn()) {

      // Switch is ON

      if (setHeightLatch <= LATCH_TIME) {

        if (setHeightLatch == LATCH_TIME) {

          // Freeze the height as target. We want to do this exactly once each time the switch is thrown ON.

          setHeight = height;

          hc_testOscTimer = 0;

          iHeight = 0;

        }

        // Time not yet reached.

        setHeightLatch++;

      }

    } else {

      // Switch is OFF.

      setHeightLatch = 0;

    }

  } else {

    // Switch is not activated; take the "max-height" as the target height.

    setHeight = (uint16_t) (HEIGHT_FORMULA(dynamicParams.heightSetting)); // should be: 100 (or make a param out of it)

  }

  /*

  if (++heightRampingTimer == INTEGRATION_FREQUENCY / 10) {

    heightRampingTimer = 0;

    if (rampedTargetHeight < targetHeight) {

      // climbing

      if (rampedTargetHeight < targetHeight - staticParams.heightSlewRate) {

        rampedTargetHeight += staticParams.heightSlewRate;

      } else {

        rampedTargetHeight = targetHeight;

      }

    } else {

      // descending

      if (rampedTargetHeight > targetHeight + staticParams.heightSlewRate) {

        rampedTargetHeight -= staticParams.heightSlewRate;

      } else {

        rampedTargetHeight = targetHeight;

      }

    }

  }

  */

  //      uint8_t heightControlTestOscPeriod;

  //      uint8_t heightControlTestOscAmplitude;

  hc_testOscPrescaler++;

  if (hc_testOscPrescaler == 488) {

          hc_testOscPrescaler = 0;

          hc_testOscTimer++;

          if (hc_testOscTimer == staticParams.heightControlTestOscPeriod) {

                  hc_testOscTimer = 0;

                  if (staticParams.heightControlTestOscAmplitude)

                          iHeight = 0;

          } else if (hc_testOscTimer == staticParams.heightControlTestOscPeriod/2) {

                  if (staticParams.heightControlTestOscAmplitude)

                          iHeight = 0;

          }

  }

  if (hc_testOscTimer < staticParams.heightControlTestOscPeriod/2)

          targetHeight = setHeight;

  else

          targetHeight = setHeight + (uint16_t)staticParams.heightControlTestOscAmplitude * HEIGHT_GAIN;

  //if (staticParams.)

  // height, in meters (so the division factor is: 100)

  // debugOut.analog[24] = (117100 - filteredAirPressure) / 100;

  // Calculated 0 alt number: 108205

  // Experimental 0 alt number: 117100

}

#define LOG_PHEIGHT_SCALE 10

#define LOG_IHEIGHT_SCALE 24

#define LOG_DHEIGHT_SCALE 6

// takes 180-200 usec (with integral term). That is too heavy!!!

// takes 100 usec without integral term.

void HC_periodicTaskAndPRTY(int16_t* PRTY) {

  HC_periodicTask();

  int16_t throttle = PRTY[CONTROL_THROTTLE];

  int32_t height = analog_getHeight();

  int32_t heightError = targetHeight - height;

  int16_t dHeight = analog_getDHeight();

  debugOut.analog[22] = height/10L;

  debugOut.analog[23] = dHeight;

  if (heightError > 0) {

    debugOut.digital[0] |= DEBUG_HEIGHT_DIFF;

  } else {

    debugOut.digital[0] &= ~DEBUG_HEIGHT_DIFF;

  }

  if (dHeight > 0) {

    debugOut.digital[1] |= DEBUG_HEIGHT_DIFF;

  } else {

    debugOut.digital[1] &= ~DEBUG_HEIGHT_DIFF;

  }

  int32_t heightErrorForIntegral = heightError;

  int32_t heightErrorForIntegralLimit = staticParams.heightControlMaxIntegralIn << LOG_PHEIGHT_SCALE;

  if (heightErrorForIntegral > heightErrorForIntegralLimit) {

    heightErrorForIntegral = heightErrorForIntegralLimit;

  } else if (heightErrorForIntegral < -heightErrorForIntegralLimit) {

    heightErrorForIntegral =- heightErrorForIntegralLimit;

  }

  // iHeight, at a difference of 5 meters and a freq. of 488 Hz, will grow with 244000 / sec....

  iHeight += heightErrorForIntegral;

#define IHEIGHT_SCALE 24

  // dThrottle is in the range between +/- 1<<(IHEIGHT_SCALE+8)>>(IHEIGHT_SCALE) = +/- 256

  int16_t dThrottleI =  (iHeight * (int32_t)dynamicParams.heightI) >> (IHEIGHT_SCALE);

  if (dThrottleI > staticParams.heightControlMaxIntegralOut) {

    dThrottleI = staticParams.heightControlMaxIntegralOut;

    iHeight = ((int32_t)staticParams.heightControlMaxIntegralOut << IHEIGHT_SCALE) / dynamicParams.heightI;

  } else if (dThrottleI < -staticParams.heightControlMaxIntegralOut) {

    dThrottleI = -staticParams.heightControlMaxIntegralOut;

    iHeight = -((int32_t)staticParams.heightControlMaxIntegralOut << IHEIGHT_SCALE) / dynamicParams.heightI;

  }

  int16_t dThrottleP = (heightError * dynamicParams.heightP) >> LOG_PHEIGHT_SCALE;

  int16_t dThrottleD = (dHeight * dynamicParams.heightD) >> LOG_DHEIGHT_SCALE;

  debugOut.analog[10] = dThrottleP;

  debugOut.analog[11] = dThrottleI;

  debugOut.analog[12] = dThrottleD;

  debugOut.analog[13] = heightError/10;

  int16_t dThrottle = dThrottleI + dThrottleP - dThrottleD;

  if (dThrottle > staticParams.heightControlMaxThrottleChange)

    dThrottle = staticParams.heightControlMaxThrottleChange;

  else if (dThrottle < -staticParams.heightControlMaxThrottleChange)

    dThrottle = -staticParams.heightControlMaxThrottleChange;

  /*

  debugOut.analog[19] = throttle;

  debugOut.analog[20] = dThrottle;

  debugOut.analog[21] = height;

  debugOut.analog[22] = rampedTargetHeight;

  debugOut.analog[23] = heightError;

  */

  if (staticParams.bitConfig & CFG_SIMPLE_HEIGHT_CONTROL) {

    if (!(staticParams.bitConfig & CFG_SIMPLE_HC_HOLD_SWITCH) || HC_isSwitchOn()) {

      // If switch is not in use --> Just apply height control.

      // If switch is in use     --> only apply height control when switch is also ON.

      throttle += dThrottle;

    }

  }

  /* Experiment: Find hover-throttle */

#define DEFAULT_HOVERTHROTTLE 50

int32_t stronglyFilteredHeightDiff = 0;

// uint16_t hoverThrottle = 0; // DEFAULT_HOVERTHROTTLE;

uint16_t stronglyFilteredThrottle = DEFAULT_HOVERTHROTTLE;

#define HOVERTHROTTLEFILTER 25

  stronglyFilteredHeightDiff = (stronglyFilteredHeightDiff

                                * (HOVERTHROTTLEFILTER - 1) + dHeight) / HOVERTHROTTLEFILTER;

  stronglyFilteredThrottle = (stronglyFilteredThrottle * (HOVERTHROTTLEFILTER

                                                          - 1) + throttle) / HOVERTHROTTLEFILTER;

  /*

  if (isFlying >= 1000 && stronglyFilteredHeightDiff < 3

      && stronglyFilteredHeightDiff > -3) {

    hoverThrottle = stronglyFilteredThrottle;

    debugOut.digital[0] |= DEBUG_HOVERTHROTTLE;

  } else

    debugOut.digital[0] &= ~DEBUG_HOVERTHROTTLE;

    */

  PRTY[CONTROL_THROTTLE] = throttle;

}

/*

 For a variometer thingy:

 When switch is thrown on, freeze throttle (capture it into variable)

 For each iter., add (throttle - frozen throttle) to target height. Maybe don't do ramping.

 Output = frozen throttle + whatever is computed +/-. Integral?

 */