WebSVN - FlightCtrl - Diff - Rev 1868 and 1869 - /branches/dongfang_FC


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#include <avr/io.h>
#include <avr/interrupt.h>
#include <avr/pgmspace.h>
 
#include "analog.h"
#include "attitude.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 };
volatile int32_t stronglyFilteredAcc[3] = { 0,0,0 };
 
/*
 * 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];
 
        stronglyFilteredAcc[Z] =
            (stronglyFilteredAcc[Z] * 99 + acc[Z] * 10) / 100;
 
                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;
 
                stronglyFilteredAcc[PITCH] =
                    (stronglyFilteredAcc[PITCH] * 99 + acc[PITCH] * 10) / 100;
 
 
                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;
 
        stronglyFilteredAcc[ROLL] =
            (stronglyFilteredAcc[ROLL] * 99 + acc[ROLL] * 10) / 100;
 
                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.
                        DebugOut.Digital[1] |= DEBUG_SENSORLIMIT;
                        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.
                        DebugOut.Digital[1] |= DEBUG_SENSORLIMIT;
                        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.
                        DebugOut.Digital[1] &= ~DEBUG_SENSORLIMIT;
                        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) {
                                DebugOut.Digital[0] |= DEBUG_SENSORLIMIT;
                                tempGyro = tempGyro * EXTRAPOLATION_SLOPE - EXTRAPOLATION_LIMIT;
                        } else if (tempGyro > SENSOR_MAX_PITCHROLL) {
                                DebugOut.Digital[0] |= DEBUG_SENSORLIMIT;
                                tempGyro = (tempGyro - SENSOR_MAX_PITCHROLL) * EXTRAPOLATION_SLOPE
                                                + SENSOR_MAX_PITCHROLL;
                        } else {
                                DebugOut.Digital[0] &= ~DEBUG_SENSORLIMIT;
                        }
                }
 
                // 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 relativ 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 @ 1871 - Rev 1868 → 1869
