WebSVN - FlightCtrl - Diff - Rev 1775 and 1796 - /branches/dongfang_FC


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#include <avr/io.h>
#include <avr/interrupt.h>
#include <avr/pgmspace.h>
#include "analog.h"
 
#include "sensors.h"
 
// for Delay functions
#include "timer0.h"
 
// For DebugOut
#include "uart0.h"
 
// For reading and writing acc. meter offsets.
#include "eeprom.h"
 
// For DebugOut.Digital
#include "output.h"
 
/*
 * For each A/D conversion cycle, each analog channel is sampled a number of times
 * (see array channelsForStates), and the results for each channel are summed.
 * Here are those for the gyros and the acc. meters. They are not zero-offset.
 * They are exported in the analog.h file - but please do not use them! The only
 * reason for the export is that the ENC-03_FC1.3 modules needs them for calibrating
 * the offsets with the DAC.
 */
volatile int16_t rawGyroSum[3];
volatile int16_t acc[3];
volatile int16_t filteredAcc[2]={0,0};
 
/*
 * These 4 exported variables are zero-offset. The "PID" ones are used
 * in the attitude control as rotation rates. The "ATT" ones are for
 * integration to angles.
 */
volatile int16_t gyro_PID[2];
volatile int16_t gyro_ATT[2];
volatile int16_t gyroD[2];
volatile int16_t yawGyro;
 
/*
 * Offset values. These are the raw gyro and acc. meter sums when the copter is
 * standing still. They are used for adjusting the gyro and acc. meter values
 * to be centered on zero.
 */
volatile int16_t gyroOffset[3] = {
        512 * GYRO_SUMMATION_FACTOR_PITCHROLL,
        512 * GYRO_SUMMATION_FACTOR_PITCHROLL,
        512 * GYRO_SUMMATION_FACTOR_YAW
};
 
volatile int16_t accOffset[3] = {
        512 * ACC_SUMMATION_FACTOR_PITCHROLL,
        512 * ACC_SUMMATION_FACTOR_PITCHROLL,
        512 * ACC_SUMMATION_FACTOR_Z
};
 
/*
 * This allows some experimentation with the gyro filters.
 * Should be replaced by #define's later on...
 */
volatile uint8_t GYROS_PID_FILTER;
volatile uint8_t GYROS_ATT_FILTER;
volatile uint8_t GYROS_D_FILTER;
volatile uint8_t ACC_FILTER;
 
/*
 * Air pressure
 */
volatile uint8_t rangewidth = 106;
 
// Direct from sensor, irrespective of range.
// volatile uint16_t rawAirPressure;
 
// Value of 2 samples, with range.
volatile uint16_t simpleAirPressure;
 
// Value of AIRPRESSURE_SUMMATION_FACTOR samples, with range, filtered.
volatile int32_t filteredAirPressure;
 
// Partial sum of AIRPRESSURE_SUMMATION_FACTOR samples.
volatile int32_t airPressureSum;
 
// The number of samples summed into airPressureSum so far.
volatile uint8_t pressureMeasurementCount;
 
/*
 * Battery voltage, in units of: 1k/11k / 3V * 1024 = 31.03 per volt.
 * That is divided by 3 below, for a final 10.34 per volt.
 * So the initial value of 100 is for 9.7 volts.
 */
volatile int16_t UBat = 100;
 
/*
 * Control and status.
 */
volatile uint16_t ADCycleCount = 0;
volatile uint8_t analogDataReady = 1;
 
/*
 * Experiment: Measuring vibration-induced sensor noise.
 */
volatile uint16_t gyroNoisePeak[2];
volatile uint16_t accNoisePeak[2];
 
// ADC channels
#define AD_GYRO_YAW       0
#define AD_GYRO_ROLL      1
#define AD_GYRO_PITCH     2
#define AD_AIRPRESSURE    3
#define AD_UBAT           4
#define AD_ACC_Z          5
#define AD_ACC_ROLL       6
#define AD_ACC_PITCH      7
 
/*
 * Table of AD converter inputs for each state.
 * The number of samples summed for each channel is equal to
 * the number of times the channel appears in the array.
 * The max. number of samples that can be taken in 2 ms is:
 * 20e6 / 128 / 13 / (1/2e-3) = 24. Since the main control
 * loop needs a little time between reading AD values and
 * re-enabling ADC, the real limit is (how much?) lower.
 * The acc. sensor is sampled even if not used - or installed
 * at all. The cost is not significant.
 */
 
const uint8_t channelsForStates[] PROGMEM = {
  AD_GYRO_PITCH,
  AD_GYRO_ROLL,
  AD_GYRO_YAW,
 
  AD_ACC_PITCH,
  AD_ACC_ROLL,
  AD_AIRPRESSURE,
 
  AD_GYRO_PITCH,
  AD_GYRO_ROLL,
  AD_ACC_Z,       // at 8, measure Z acc.
 
  AD_GYRO_PITCH,
  AD_GYRO_ROLL,
  AD_GYRO_YAW,    // at 11, finish yaw gyro
 
  AD_ACC_PITCH,   // at 12, finish pitch axis acc.
  AD_ACC_ROLL,    // at 13, finish roll axis acc.
  AD_AIRPRESSURE, // at 14, finish air pressure.
 
  AD_GYRO_PITCH,  // at 15, finish pitch gyro
  AD_GYRO_ROLL,   // at 16, finish roll gyro
  AD_UBAT         // at 17, measure battery.
};
 
// Feature removed. Could be reintroduced later - but should work for all gyro types then.
// uint8_t GyroDefectPitch = 0, GyroDefectRoll = 0, GyroDefectYaw = 0;
 
void analog_init(void) {
  uint8_t sreg = SREG;
  // disable all interrupts before reconfiguration
  cli();
 
  //ADC0 ... ADC7 is connected to PortA pin 0 ... 7
  DDRA = 0x00;
  PORTA = 0x00;
  // Digital Input Disable Register 0
  // Disable digital input buffer for analog adc_channel pins
  DIDR0 = 0xFF;
  // external reference, adjust data to the right
  ADMUX &= ~((1 << REFS1)|(1 << REFS0)|(1 << ADLAR));
  // set muxer to ADC adc_channel 0 (0 to 7 is a valid choice)
  ADMUX = (ADMUX & 0xE0) | AD_GYRO_PITCH;
  //Set ADC Control and Status Register A
  //Auto Trigger Enable, Prescaler Select Bits to Division Factor 128, i.e. ADC clock = SYSCKL/128 = 156.25 kHz
  ADCSRA = (0<<ADEN)|(0<<ADSC)|(0<<ADATE)|(1<<ADPS2)|(1<<ADPS1)|(1<<ADPS0)|(0<<ADIE);
  //Set ADC Control and Status Register B
  //Trigger Source to Free Running Mode
  ADCSRB &= ~((1 << ADTS2)|(1 << ADTS1)|(1 << ADTS0));
  // Start AD conversion
  analog_start();
  // restore global interrupt flags
  SREG = sreg;
}
 
void measureNoise(const int16_t sensor, volatile uint16_t* const noiseMeasurement, const uint8_t damping) {
  if (sensor > (int16_t)(*noiseMeasurement)) {
    *noiseMeasurement = sensor;
  } else if (-sensor > (int16_t)(*noiseMeasurement)) {
    *noiseMeasurement = -sensor;
  } else if (*noiseMeasurement > damping) {
    *noiseMeasurement -= damping;
  } else {
    *noiseMeasurement = 0;
  }
}
 
/*
 * Min.: 0
 * Max: About 106 * 240 + 2047 = 27487; it is OK with just a 16 bit type.
 */
uint16_t getSimplePressure(int advalue) {
  return (uint16_t)OCR0A * (uint16_t)rangewidth + advalue;
}
 
/*****************************************************
 * Interrupt Service Routine for ADC            
 * Runs at 312.5 kHz or 3.2 µs. When all states are
 * processed the interrupt is disabled and further
 * AD conversions are stopped.
 *****************************************************/
ISR(ADC_vect) {
  static uint8_t ad_channel = AD_GYRO_PITCH, state = 0;
  static uint16_t sensorInputs[8] = {0,0,0,0,0,0,0,0};
  static uint16_t pressureAutorangingWait = 25;
  uint16_t rawAirPressure;
  uint8_t i, axis;
  int16_t newrange;
 
  // for various filters...
  int16_t tempOffsetGyro, tempGyro;
 
  sensorInputs[ad_channel] += ADC;
 
  /*
   * Actually we don't need this "switch". We could do all the sampling into the
   * sensorInputs array first, and all the processing after the last sample.
   */
  switch(state++) {
 
  case 8: // Z acc      
  if (ACC_REVERSED[Z])
    acc[Z] = accOffset[Z] - sensorInputs[AD_ACC_Z];
  else
    acc[Z] = sensorInputs[AD_ACC_Z] - accOffset[Z];
  break;
   
  case 11: // yaw gyro
    rawGyroSum[YAW] = sensorInputs[AD_GYRO_YAW];
    if (GYRO_REVERSED[YAW])
      yawGyro = gyroOffset[YAW] - sensorInputs[AD_GYRO_YAW];
    else
      yawGyro = sensorInputs[AD_GYRO_YAW] - gyroOffset[YAW];
    break;
   
  case 12: // pitch axis acc.
    if (ACC_REVERSED[PITCH])
      acc[PITCH] = accOffset[PITCH] - sensorInputs[AD_ACC_PITCH];
    else
      acc[PITCH] = sensorInputs[AD_ACC_PITCH] - accOffset[PITCH];
 
    filteredAcc[PITCH] = (filteredAcc[PITCH] * (ACC_FILTER-1) + acc[PITCH]) / ACC_FILTER;
    measureNoise(acc[PITCH], &accNoisePeak[PITCH], 1);
    break;
   
  case 13: // roll axis acc.
    if (ACC_REVERSED[ROLL])
      acc[ROLL] = accOffset[ROLL] - sensorInputs[AD_ACC_ROLL];
    else
      acc[ROLL] = sensorInputs[AD_ACC_ROLL] - accOffset[ROLL];
    filteredAcc[ROLL] = (filteredAcc[ROLL] * (ACC_FILTER-1) + acc[ROLL]) / ACC_FILTER;
    measureNoise(acc[ROLL], &accNoisePeak[ROLL], 1);
    break;
 
  case 14: // air pressure
    if (pressureAutorangingWait) {
      //A range switch was done recently. Wait for steadying.
      pressureAutorangingWait--;
      DebugOut.Analog[27] = (uint16_t)OCR0A;
      DebugOut.Analog[31] = simpleAirPressure;
      break;
    }
 
    rawAirPressure = sensorInputs[AD_AIRPRESSURE];
    if (rawAirPressure < MIN_RAWPRESSURE) {
      // value is too low, so decrease voltage on the op amp minus input, making the value higher.
      newrange = OCR0A - (MAX_RAWPRESSURE - MIN_RAWPRESSURE) / (rangewidth * 4);  // 4; // (MAX_RAWPRESSURE - rawAirPressure) / (rangewidth * 2) + 1;
      if (newrange > MIN_RANGES_EXTRAPOLATION) {
        pressureAutorangingWait = (OCR0A - newrange) * AUTORANGE_WAIT_FACTOR; // = OCRA0 - OCRA0 + 
        OCR0A = newrange;
      } else {
        if (OCR0A) {
          OCR0A--;
          pressureAutorangingWait = AUTORANGE_WAIT_FACTOR;
        }
      }
    } else if (rawAirPressure > MAX_RAWPRESSURE) {
      // value is too high, so increase voltage on the op amp minus input, making the value lower.
      // If near the end, make a limited increase
      newrange = OCR0A + (MAX_RAWPRESSURE - MIN_RAWPRESSURE) / (rangewidth * 4); // 4;  // (rawAirPressure - MIN_RAWPRESSURE) / (rangewidth * 2) - 1;
      if (newrange < MAX_RANGES_EXTRAPOLATION) {
      pressureAutorangingWait = (newrange - OCR0A) * AUTORANGE_WAIT_FACTOR;
      OCR0A = newrange;
      } else {
        if (OCR0A<254) {
          OCR0A++;
          pressureAutorangingWait = AUTORANGE_WAIT_FACTOR;
        }
      }
    }
 
    // Even if the sample is off-range, use it.
    simpleAirPressure = getSimplePressure(rawAirPressure);
    DebugOut.Analog[27] = (uint16_t)OCR0A;
    DebugOut.Analog[31] = simpleAirPressure;
 
    if (simpleAirPressure < MIN_RANGES_EXTRAPOLATION * rangewidth) {
      // Danger: pressure near lower end of range. If the measurement saturates, the 
      // copter may climb uncontrolledly... Simulate a drastic reduction in pressure.
      airPressureSum += (int16_t)MIN_RANGES_EXTRAPOLATION * rangewidth + (simpleAirPressure - (int16_t)MIN_RANGES_EXTRAPOLATION * rangewidth) * PRESSURE_EXTRAPOLATION_COEFF;
    } else if (simpleAirPressure > MAX_RANGES_EXTRAPOLATION * rangewidth) {
      // Danger: pressure near upper end of range. If the measurement saturates, the 
      // copter may descend uncontrolledly... Simulate a drastic increase in pressure.
      airPressureSum += (int16_t)MAX_RANGES_EXTRAPOLATION * rangewidth + (simpleAirPressure - (int16_t)MAX_RANGES_EXTRAPOLATION * rangewidth) * PRESSURE_EXTRAPOLATION_COEFF;
    } else {
      // normal case.
      // If AIRPRESSURE_SUMMATION_FACTOR is an odd number we only want to add half the double sample.
      // The 2 cases above (end of range) are ignored for this.
      if (pressureMeasurementCount == AIRPRESSURE_SUMMATION_FACTOR - 1)
        airPressureSum += simpleAirPressure / 2;
      else
        airPressureSum += simpleAirPressure;
    }
 
    // 2 samples were added.
    pressureMeasurementCount += 2;
    if (pressureMeasurementCount >= AIRPRESSURE_SUMMATION_FACTOR) {
      filteredAirPressure = (filteredAirPressure * (AIRPRESSURE_FILTER-1) + airPressureSum + AIRPRESSURE_FILTER/2) / AIRPRESSURE_FILTER;
      pressureMeasurementCount = airPressureSum = 0;
    }
 
 
 
 
 
    break;
 
  case 15:
  case 16: // pitch or roll gyro.
    axis = state - 16;
    tempGyro = rawGyroSum[axis] = sensorInputs[AD_GYRO_PITCH - axis];
        // DebugOut.Analog[6 + 3 * axis ] = tempGyro;
    /*
     * Process the gyro data for the PID controller.
     */
    // 1) Extrapolate: Near the ends of the range, we boost the input significantly. This simulates a
    //    gyro with a wider range, and helps counter saturation at full control.
 
    if (staticParams.GlobalConfig & CFG_ROTARY_RATE_LIMITER) {
      if (tempGyro < SENSOR_MIN_PITCHROLL) {
        tempGyro = tempGyro * EXTRAPOLATION_SLOPE - EXTRAPOLATION_LIMIT;
      }
      else if (tempGyro > SENSOR_MAX_PITCHROLL) {
        tempGyro = (tempGyro - SENSOR_MAX_PITCHROLL) * EXTRAPOLATION_SLOPE + SENSOR_MAX_PITCHROLL;
      }
    }
 
    // 2) Apply sign and offset, scale before filtering.
    if (GYRO_REVERSED[axis]) {
      tempOffsetGyro = (gyroOffset[axis] - tempGyro) * GYRO_FACTOR_PITCHROLL;
    } else {
      tempOffsetGyro = (tempGyro - gyroOffset[axis]) * GYRO_FACTOR_PITCHROLL;
    }
 
    // 3) Scale and filter.
    tempOffsetGyro = (gyro_PID[axis] * (GYROS_PID_FILTER-1) + tempOffsetGyro) / GYROS_PID_FILTER;
 
    // 4) Measure noise.
    measureNoise(tempOffsetGyro, &gyroNoisePeak[axis], GYRO_NOISE_MEASUREMENT_DAMPING);
 
    // 5) Differential measurement. 
    gyroD[axis] = (gyroD[axis] * (GYROS_D_FILTER-1) + (tempOffsetGyro - gyro_PID[axis])) / GYROS_D_FILTER;
 
    // 6) Done.
    gyro_PID[axis] = tempOffsetGyro;
 
    /*
     * Now process the data for attitude angles.
     */
    tempGyro = rawGyroSum[axis];
   
    // 1) Apply sign and offset, scale before filtering.
    if (GYRO_REVERSED[axis]) {
      tempOffsetGyro = (gyroOffset[axis] - tempGyro) * GYRO_FACTOR_PITCHROLL;
    } else {
      tempOffsetGyro = (tempGyro - gyroOffset[axis]) * GYRO_FACTOR_PITCHROLL;
    }
   
    // 2) Filter.
    gyro_ATT[axis] = (gyro_ATT[axis] * (GYROS_ATT_FILTER-1) + tempOffsetGyro) / GYROS_ATT_FILTER;
    break;
   
  case 17:
    // Battery. The measured value is: (V * 1k/11k)/3v * 1024 = 31.03 counts per volt (max. measurable is 33v).
    // This is divided by 3 --> 10.34 counts per volt.
    UBat = (3 * UBat + sensorInputs[AD_UBAT] / 3) / 4;
    DebugOut.Analog[11] = UBat;
    analogDataReady = 1; // mark
    ADCycleCount++;
    // Stop the sampling. Cycle is over.
    state = 0;
    for (i=0; i<8; i++) {
      sensorInputs[i] = 0;
    }
    break;
  default: {} // do nothing.
  }
 
  // set up for next state.
  ad_channel = pgm_read_byte(&channelsForStates[state]);
  // ad_channel = channelsForStates[state];
     
  // set adc muxer to next ad_channel
  ADMUX = (ADMUX & 0xE0) | ad_channel;
  // after full cycle stop further interrupts
  if(state) analog_start();
}
 
void analog_calibrate(void) {
#define GYRO_OFFSET_CYCLES 32
  uint8_t i, axis;
  int32_t deltaOffsets[3] = {0,0,0};
 
  // Set the filters... to be removed again, once some good settings are found.
  GYROS_PID_FILTER = (dynamicParams.UserParams[4]   & 0b00000011)       + 1;
  GYROS_ATT_FILTER = ((dynamicParams.UserParams[4]  & 0b00001100) >> 2) + 1;
  GYROS_D_FILTER = ((dynamicParams.UserParams[4]    & 0b00110000) >> 4) + 1;
  ACC_FILTER = ((dynamicParams.UserParams[4]        & 0b11000000) >> 6) + 1;
 
  gyro_calibrate();
 
  // determine gyro bias by averaging (requires that the copter does not rotate around any axis!)
  for(i=0; i < GYRO_OFFSET_CYCLES; i++) {
    Delay_ms_Mess(20);
    for (axis=PITCH; axis<=YAW; axis++) {
      deltaOffsets[axis] += rawGyroSum[axis];
    }
  }
 
  for (axis=PITCH; axis<=YAW; axis++) {
    gyroOffset[axis] =  (deltaOffsets[axis] + GYRO_OFFSET_CYCLES/2) / GYRO_OFFSET_CYCLES;
    DebugOut.Analog[20+axis] = gyroOffset[axis];
  }
 
  // Noise is relative to offset. So, reset noise measurements when changing offsets.
  gyroNoisePeak[PITCH] = gyroNoisePeak[ROLL] = 0;
 
  accOffset[PITCH] = GetParamWord(PID_ACC_PITCH);
  accOffset[ROLL]  = GetParamWord(PID_ACC_ROLL);
  accOffset[Z]     = GetParamWord(PID_ACC_Z);
 
  // Rough estimate. Hmm no nothing happens at calibration anyway.
  // airPressureSum = simpleAirPressure * (AIRPRESSURE_SUMMATION_FACTOR/2);
  // pressureMeasurementCount = 0;
 
 
 
 
  Delay_ms_Mess(100);
}
 
/*
 * Find acc. offsets for a neutral reading, and write them to EEPROM.
 * Does not (!} update the local variables. This must be done with a
 * call to analog_calibrate() - this always (?) is done by the caller
 * anyway. There would be nothing wrong with updating the variables
 * directly from here, though.
 */
void analog_calibrateAcc(void) {
#define ACC_OFFSET_CYCLES 10
  uint8_t i, axis;
  int32_t deltaOffset[3] = {0,0,0};
  int16_t filteredDelta;
  // int16_t pressureDiff, savedRawAirPressure;
 
  for(i=0; i < ACC_OFFSET_CYCLES; i++) {
    Delay_ms_Mess(10);
    for (axis=PITCH; axis<=YAW; axis++) {
      deltaOffset[axis] += acc[axis];
    }
  }
 
  for (axis=PITCH; axis<=YAW; axis++) {
    filteredDelta = (deltaOffset[axis] + ACC_OFFSET_CYCLES / 2) / ACC_OFFSET_CYCLES;
    accOffset[axis] += ACC_REVERSED[axis] ? -filteredDelta : filteredDelta;
  }
 
  // Save ACC neutral settings to eeprom
  SetParamWord(PID_ACC_PITCH, accOffset[PITCH]);
  SetParamWord(PID_ACC_ROLL,  accOffset[ROLL]);
  SetParamWord(PID_ACC_Z,     accOffset[Z]);
 
  // Noise is relative to offset. So, reset noise measurements when
  // changing offsets.
  accNoisePeak[PITCH] = accNoisePeak[ROLL] = 0;
 
  // Setting offset values has an influence in the analog.c ISR
  // Therefore run measurement for 100ms to achive stable readings
  Delay_ms_Mess(100);
 
  // Set the feedback so that air pressure ends up in the middle of the range.
  // (raw pressure high --> OCR0A also high...)
 
 
 
  /*
  OCR0A += ((rawAirPressure - 1024) / rangewidth) - 1;
  Delay_ms_Mess(1000);
 
  pressureDiff = 0;
  // DebugOut.Analog[16] = rawAirPressure;
 
#define PRESSURE_CAL_CYCLE_COUNT 5
  for (i=0; i<PRESSURE_CAL_CYCLE_COUNT; i++) {
    savedRawAirPressure = rawAirPressure;
    OCR0A+=2;
    Delay_ms_Mess(500);
    // raw pressure will decrease.
 
    pressureDiff += (savedRawAirPressure - rawAirPressure);
    savedRawAirPressure = rawAirPressure;
    OCR0A-=2;
    Delay_ms_Mess(500);
    // raw pressure will increase.
    pressureDiff += (rawAirPressure - savedRawAirPressure);
  }
 
 
  rangewidth = (pressureDiff + PRESSURE_CAL_CYCLE_COUNT * 2 * 2 - 1) / (PRESSURE_CAL_CYCLE_COUNT * 2 * 2);
  DebugOut.Analog[27] = rangewidth;
  */
}
 
Subversion Repositories FlightCtrl

(root)/branches/dongfang_FC_rewrite/analog.c @ 1775 - Rev 1775 → 1796
