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1775 - 1
#include <inttypes.h>
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#include "analog.h"
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#include "attitude.h"
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#include "uart0.h"
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#include "configuration.h"
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// for digital / LED debug.
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#include "output.h"
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// For scope debugging only!
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#include "rc.h"
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#define INTEGRAL_LIMIT 100000
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#define LATCH_TIME 40
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int32_t targetHeight;
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int32_t rampedTargetHeight;
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uint8_t heightRampingTimer = 0;
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int32_t maxHeightThisFlight;
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int32_t iHeight;
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void HC_setGround(void) {
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  analog_setGround();
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  // This should also happen when height control is enabled in-flight.
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  rampedTargetHeight = targetHeight = analog_getHeight();
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  maxHeightThisFlight = 0;
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  iHeight = 0;
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}
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void HC_update(void) {
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  int32_t height = analog_getHeight();
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  static uint8_t setHeightLatch = 0;
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1961 - 36
  if (height > maxHeightThisFlight)
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    maxHeightThisFlight = height;
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1961 - 39
  if (staticParams.bitConfig & CFG_SIMPLE_HC_HOLD_SWITCH) {
1960 - 40
    // If switch is activated in config, the MaxHeight parameter is a switch value: ON in both ends of the range; OFF in the middle.
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    if (dynamicParams.heightSetting < 40 || dynamicParams.heightSetting > 255 - 40) {
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      // Switch is ON
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      if (setHeightLatch <= LATCH_TIME) {
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        if (setHeightLatch == LATCH_TIME) {
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          // Freeze the height as target. We want to do this exactly once each time the switch is thrown ON.
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          rampedTargetHeight = targetHeight = height;
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        }
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        // Time not yet reached.
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        setHeightLatch++;
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      }
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    } else {
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      // Switch is OFF.
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      setHeightLatch = 0;
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    }
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  } else {
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    // Switch is not activated; take the "max-height" as the target height.
2033 - 57
    targetHeight = (uint16_t) dynamicParams.heightSetting * 25L - 500L; // should be: 100 (or make a param out of it)
1960 - 58
  }
59
 
60
  if (++heightRampingTimer == INTEGRATION_FREQUENCY / 10) {
61
    heightRampingTimer = 0;
1961 - 62
    if (rampedTargetHeight < targetHeight) {
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      // climbing
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      if (rampedTargetHeight < targetHeight - staticParams.heightSlewRate) {
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        rampedTargetHeight += staticParams.heightSlewRate;
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      } else {
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        rampedTargetHeight = targetHeight;
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      }
2026 - 69
    } else {
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      // descending
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      if (rampedTargetHeight > targetHeight + staticParams.heightSlewRate) {
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        rampedTargetHeight -= staticParams.heightSlewRate;
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      } else {
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        rampedTargetHeight = targetHeight;
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      }
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    }
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  }
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1960 - 79
  // height, in meters (so the division factor is: 100)
1980 - 80
  debugOut.analog[30] = (117100 - filteredAirPressure) / 100;
1971 - 81
  // Calculated 0 alt number: 108205
1980 - 82
  // Experimental 0 alt number: 117100
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}
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// takes 180-200 usec (with integral term). That is too heavy!!!
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// takes 100 usec without integral term.
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uint16_t HC_getThrottle(uint16_t throttle) {
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  int32_t height = analog_getHeight();
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  int32_t heightError = rampedTargetHeight - height;
2026 - 90
 
2033 - 91
  //static int32_t lastHeight;
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  int16_t dHeight = analog_getDHeight();
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  //lastHeight = height;
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2026 - 95
  if (heightError > 0) {
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    debugOut.digital[0] |= DEBUG_HEIGHT_DIFF;
2035 - 97
  } else {
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    debugOut.digital[0] &= ~DEBUG_HEIGHT_DIFF;
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  }
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101
  if (dHeight > 0) {
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    debugOut.digital[1] |= DEBUG_HEIGHT_DIFF;
2035 - 103
  } else {
104
    debugOut.digital[1] &= ~DEBUG_HEIGHT_DIFF;
1960 - 105
  }
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2033 - 107
  // iHeight, at a difference of 5 meters and a freq. of 488 Hz, will grow with 244000 / sec....
108
  iHeight += heightError;
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2033 - 110
#define IHEIGHT_SCALE 24
111
  // dThrottle is in the range between +/- 1<<(IHEIGHT_SCALE+8)>>(IHEIGHT_SCALE) = +/- 256
2035 - 112
  int16_t dThrottleI =  (iHeight * (int32_t)dynamicParams.heightI) >> (IHEIGHT_SCALE);
2033 - 113
 
2035 - 114
  if (dThrottleI > staticParams.heightControlMaxIntegral) {
115
    dThrottleI = staticParams.heightControlMaxIntegral;
116
    iHeight = ((int32_t)staticParams.heightControlMaxIntegral << IHEIGHT_SCALE) / dynamicParams.heightI;
117
  } else if (dThrottleI < -staticParams.heightControlMaxIntegral) {
118
    dThrottleI = -staticParams.heightControlMaxIntegral;
119
    iHeight = -((int32_t)staticParams.heightControlMaxIntegral << IHEIGHT_SCALE) / dynamicParams.heightI;
2033 - 120
  }
121
 
2035 - 122
  int16_t dThrottleP = (heightError * dynamicParams.heightP) >> 10;
123
  int16_t dThrottleD = (dHeight * dynamicParams.heightD) >> 7;
2033 - 124
 
2035 - 125
  debugOut.analog[24] = dThrottleP;
126
  debugOut.analog[25] = dThrottleI;
127
  debugOut.analog[26] = dThrottleD;
2032 - 128
 
2035 - 129
  debugOut.analog[27] = dynamicParams.heightP;
130
  debugOut.analog[28] = dynamicParams.heightI;
131
  debugOut.analog[29] = dynamicParams.heightD;
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133
  int16_t dThrottle = dThrottleI + dThrottleP + dThrottleD;
134
 
1961 - 135
  if (dThrottle > staticParams.heightControlMaxThrottleChange)
136
    dThrottle = staticParams.heightControlMaxThrottleChange;
137
  else if (dThrottle < -staticParams.heightControlMaxThrottleChange)
138
    dThrottle = -staticParams.heightControlMaxThrottleChange;
2026 - 139
 
2035 - 140
  debugOut.analog[19] = throttle;
141
  debugOut.analog[20] = dThrottle;
142
  debugOut.analog[21] = height;
143
  debugOut.analog[22] = rampedTargetHeight;
144
  debugOut.analog[23] = heightError;
2026 - 145
 
1961 - 146
  if (staticParams.bitConfig & CFG_SIMPLE_HEIGHT_CONTROL) {
147
    if (!(staticParams.bitConfig & CFG_SIMPLE_HC_HOLD_SWITCH)
1960 - 148
        || (dynamicParams.heightSetting < 40 || dynamicParams.heightSetting > 255 - 40)) {
149
      // If switch is not in use --> Just apply height control.
150
      // If switch is in use     --> only apply height control when switch is also ON.
151
      throttle += dThrottle;
152
    }
153
  }
1961 - 154
 
155
  /* Experiment: Find hover-throttle */
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157
#define DEFAULT_HOVERTHROTTLE 50
158
int32_t stronglyFilteredHeightDiff = 0;
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// uint16_t hoverThrottle = 0; // DEFAULT_HOVERTHROTTLE;
1961 - 160
uint16_t stronglyFilteredThrottle = DEFAULT_HOVERTHROTTLE;
161
#define HOVERTHROTTLEFILTER 25
1960 - 162
 
163
  stronglyFilteredHeightDiff = (stronglyFilteredHeightDiff
164
                                * (HOVERTHROTTLEFILTER - 1) + dHeight) / HOVERTHROTTLEFILTER;
165
  stronglyFilteredThrottle = (stronglyFilteredThrottle * (HOVERTHROTTLEFILTER
166
                                                          - 1) + throttle) / HOVERTHROTTLEFILTER;
167
 
2035 - 168
  /*
1960 - 169
  if (isFlying >= 1000 && stronglyFilteredHeightDiff < 3
170
      && stronglyFilteredHeightDiff > -3) {
171
    hoverThrottle = stronglyFilteredThrottle;
172
    debugOut.digital[0] |= DEBUG_HOVERTHROTTLE;
173
  } else
174
    debugOut.digital[0] &= ~DEBUG_HOVERTHROTTLE;
2035 - 175
 
176
    */
1960 - 177
 
178
  return throttle;
1775 - 179
}
180
 
181
/*
1821 - 182
 For a variometer thingy:
183
 When switch is thrown on, freeze throttle (capture it into variable)
184
 For each iter., add (throttle - frozen throttle) to target height. Maybe don't do ramping.
185
 Output = frozen throttle + whatever is computed +/-. Integral?
186
 */