Hi Paraglider,
ich habe mal alles überflüssige rausgeschmissen und gerade kompiliert. Version war die letzte DEV. Leider habe ich jetzt vor der Arbeit keine Zeit mir einen Platz zum umploaden zu suchen.
Dieses ist der Inhalt der
IMU.ino. Hoffe das es so klappt.
Gruß Deacon Blues
// ab hier der Inhalt der Datei IMU.ino
void computeIMU () {
uint8_t axis;
static int16_t gyroADCprevious[3] = {0,0,0};
int16_t gyroADCp[3];
int16_t gyroADCinter[3];
static uint32_t timeInterleave = 0;
//we separate the 2 situations because reading gyro values with a gyro only setup can be acchieved at a higher rate
//gyro+nunchuk: we must wait for a quite high delay betwwen 2 reads to get both WM+ and Nunchuk data. It works with 3ms
//gyro only: the delay to read 2 consecutive values can be reduced to only 0.65ms
#if defined(NUNCHUCK)
annexCode();
while((micros()-timeInterleave)<INTERLEAVING_DELAY) ; //interleaving delay between 2 consecutive reads
timeInterleave=micros();
ACC_getADC();
getEstimatedAttitude(); // computation time must last less than one interleaving delay
while((micros()-timeInterleave)<INTERLEAVING_DELAY) ; //interleaving delay between 2 consecutive reads
timeInterleave=micros();
f.NUNCHUKDATA = 1;
while(f.NUNCHUKDATA) ACC_getADC(); // For this interleaving reading, we must have a gyro update at this point (less delay)
for (axis = 0; axis < 3; axis++) {
// empirical, we take a weighted value of the current and the previous values
// /4 is to average 4 values, note: overflow is not possible for WMP gyro here
gyroData[axis] = (gyroADC[axis]*3+gyroADCprevious[axis])/4;
gyroADCprevious[axis] = gyroADC[axis];
}
#else
#if ACC
ACC_getADC();
getEstimatedAttitude();
#endif
#if GYRO
Gyro_getADC();
#endif
for (axis = 0; axis < 3; axis++)
gyroADCp[axis] = gyroADC[axis];
timeInterleave=micros();
annexCode();
if ((micros()-timeInterleave)>650) {
annex650_overrun_count++;
} else {
while((micros()-timeInterleave)<650) ; //empirical, interleaving delay between 2 consecutive reads
}
#if GYRO
Gyro_getADC();
#endif
for (axis = 0; axis < 3; axis++) {
gyroADCinter[axis] = gyroADC[axis]+gyroADCp[axis];
// empirical, we take a weighted value of the current and the previous values
gyroData[axis] = (gyroADCinter[axis]+gyroADCprevious[axis])/3;
gyroADCprevious[axis] = gyroADCinter[axis]/2;
if (!ACC) accADC[axis]=0;
}
#endif
#if defined(GYRO_SMOOTHING)
static int16_t gyroSmooth[3] = {0,0,0};
for (axis = 0; axis < 3; axis++) {
gyroData[axis] = (int16_t) ( ( (int32_t)((int32_t)gyroSmooth[axis] * (conf.Smoothing[axis]-1) )+gyroData[axis]+1 ) / conf.Smoothing[axis]);
gyroSmooth[axis] = gyroData[axis];
}
#elif defined(TRI)
static int16_t gyroYawSmooth = 0;
gyroData[YAW] = (gyroYawSmooth*2+gyroData[YAW])/3;
gyroYawSmooth = gyroData[YAW];
#endif
}
// **************************************************
// Simplified IMU based on "Complementary Filter"
// Inspired by
http://starlino.com/imu_guide.html
//
// adapted by ziss_dm :
http://www.multiwii.com/forum/viewtopic.php?f=8&t=198
//
// The following ideas was used in this project:
// 1) Rotation matrix:
http://en.wikipedia.org/wiki/Rotation_matrix
// 2) Small-angle approximation:
http://en.wikipedia.org/wiki/Small-angle_approximation
// 3) C. Hastings approximation for atan2()
// 4) Optimization tricks:
http://www.hackersdelight.org/
//
// Currently Magnetometer uses separate CF which is used only
// for heading approximation.
//
// **************************************************
//****** advanced users settings *******************
/* Set the Low Pass Filter factor for ACC */
/* Increasing this value would reduce ACC noise (visible in GUI), but would increase ACC lag time*/
/* Comment this if you do not want filter at all.*/
#ifndef ACC_LPF_FACTOR
#define ACC_LPF_FACTOR 100
#endif
/* Set the Low Pass Filter factor for Magnetometer */
/* Increasing this value would reduce Magnetometer noise (not visible in GUI), but would increase Magnetometer lag time*/
/* Comment this if you do not want filter at all.*/
/* Default WMC value: n/a*/
#ifndef MG_LPF_FACTOR
//#define MG_LPF_FACTOR 4
#endif
/* Set the Gyro Weight for Gyro/Acc complementary filter */
/* Increasing this value would reduce and delay Acc influence on the output of the filter*/
/* Default WMC value: 300*/
#ifndef GYR_CMPF_FACTOR
#define GYR_CMPF_FACTOR 400.0f
#endif
/* Set the Gyro Weight for Gyro/Magnetometer complementary filter */
/* Increasing this value would reduce and delay Magnetometer influence on the output of the filter*/
/* Default WMC value: n/a*/
#ifndef GYR_CMPFM_FACTOR
#define GYR_CMPFM_FACTOR 200.0f
#endif
//****** end of advanced users settings *************
#define INV_GYR_CMPF_FACTOR (1.0f / (GYR_CMPF_FACTOR + 1.0f))
#define INV_GYR_CMPFM_FACTOR (1.0f / (GYR_CMPFM_FACTOR + 1.0f))
#if GYRO
#define GYRO_SCALE ((2380 * PI)/((32767.0f / 4.0f ) * 180.0f * 1000000.0f)) //should be 2279.44 but 2380 gives better result
// +-2000/sec deg scale
//#define GYRO_SCALE ((200.0f * PI)/((32768.0f / 5.0f / 4.0f ) * 180.0f * 1000000.0f) * 1.5f)
// +- 200/sec deg scale
// 1.5 is emperical, not sure what it means
// should be in rad/sec
#else
#define GYRO_SCALE (1.0f/200e6f)
// empirical, depends on WMP on IDG datasheet, tied of deg/ms sensibility
// !!!!should be adjusted to the rad/sec
#endif
// Small angle approximation
#define ssin(val) (val)
#define scos(val) 1.0f
typedef struct fp_vector {
float X;
float Y;
float Z;
} t_fp_vector_def;
typedef union {
float A[3];
t_fp_vector_def V;
} t_fp_vector;
int16_t _atan2(float y, float x){
#define fp_is_neg(val) ((((uint8_t*)&val)[3] & 0x80) != 0)
float z = y / x;
int16_t zi = abs(int16_t(z * 100));
int8_t y_neg = fp_is_neg
;
if ( zi < 100 ){
if (zi > 10)
z = z / (1.0f + 0.28f * z * z);
if (fp_is_neg(x)) {
if (y_neg) z -= PI;
else z += PI;
}
} else {
z = (PI / 2.0f) - z / (z * z + 0.28f);
if (y_neg) z -= PI;
}
z *= (180.0f / PI * 10);
return z;
}
// Rotate Estimated vector(s) with small angle approximation, according to the gyro data
void rotateV(struct fp_vector *v,float* delta) {
fp_vector v_tmp = *v;
v->Z -= delta[ROLL] * v_tmp.X + delta[PITCH] * v_tmp.Y;
v->X += delta[ROLL] * v_tmp.Z - delta[YAW] * v_tmp.Y;
v->Y += delta[PITCH] * v_tmp.Z + delta[YAW] * v_tmp.X;
}
void getEstimatedAttitude(){
uint8_t axis;
int32_t accMag = 0;
static t_fp_vector EstG;
#if MAG
static t_fp_vector EstM;
#endif
#if defined(MG_LPF_FACTOR)
static int16_t mgSmooth[3];
#endif
#if defined(ACC_LPF_FACTOR)
static float accLPF[3];
#endif
static uint16_t previousT;
uint16_t currentT = micros();
float scale, deltaGyroAngle[3];
scale = (currentT - previousT) * GYRO_SCALE;
previousT = currentT;
// Initialization
for (axis = 0; axis < 3; axis++) {
deltaGyroAngle[axis] = gyroADC[axis] * scale;
#if defined(ACC_LPF_FACTOR)
accLPF[axis] = accLPF[axis] * (1.0f - (1.0f/ACC_LPF_FACTOR)) + accADC[axis] * (1.0f/ACC_LPF_FACTOR);
accSmooth[axis] = accLPF[axis];
#define ACC_VALUE accSmooth[axis]
#else
accSmooth[axis] = accADC[axis];
#define ACC_VALUE accADC[axis]
#endif
// accMag += (ACC_VALUE * 10 / (int16_t)acc_1G) * (ACC_VALUE * 10 / (int16_t)acc_1G);
accMag += (int32_t)ACC_VALUE*ACC_VALUE ;
#if MAG
#if defined(MG_LPF_FACTOR)
mgSmooth[axis] = (mgSmooth[axis] * (MG_LPF_FACTOR - 1) + magADC[axis]) / MG_LPF_FACTOR; // LPF for Magnetometer values
#define MAG_VALUE mgSmooth[axis]
#else
#define MAG_VALUE magADC[axis]
#endif
#endif
}
accMag = accMag*100/((int32_t)acc_1G*acc_1G);
rotateV(&EstG.V,deltaGyroAngle);
#if MAG
rotateV(&EstM.V,deltaGyroAngle);
#endif
if ( abs(accSmooth[ROLL])<acc_25deg && abs(accSmooth[PITCH])<acc_25deg && accSmooth[YAW]>0) {
f.SMALL_ANGLES_25 = 1;
} else {
f.SMALL_ANGLES_25 = 0;
}
// Apply complimentary filter (Gyro drift correction)
// If accel magnitude >1.4G or <0.6G and ACC vector outside of the limit range => we neutralize the effect of accelerometers in the angle estimation.
// To do that, we just skip filter, as EstV already rotated by Gyro
if ( ( 36 < accMag && accMag < 196 ) || f.SMALL_ANGLES_25 )
for (axis = 0; axis < 3; axis++) {
int16_t acc = ACC_VALUE;
EstG.A[axis] = (EstG.A[axis] * GYR_CMPF_FACTOR + acc) * INV_GYR_CMPF_FACTOR;
}
#if MAG
for (axis = 0; axis < 3; axis++)
EstM.A[axis] = (EstM.A[axis] * GYR_CMPFM_FACTOR + MAG_VALUE) * INV_GYR_CMPFM_FACTOR;
#endif
// Attitude of the estimated vector
angle[ROLL] = _atan2(EstG.V.X , EstG.V.Z) ;
angle[PITCH] = _atan2(EstG.V.Y , EstG.V.Z) ;
#if MAG
// Attitude of the cross product vector GxM
heading = _atan2( EstG.V.X * EstM.V.Z - EstG.V.Z * EstM.V.X , EstG.V.Z * EstM.V.Y - EstG.V.Y * EstM.V.Z );
heading += MAG_DECLINIATION * 10; //add declination
heading = heading /10;
if ( heading > 180) heading = heading - 360;
else if (heading < -180) heading = heading + 360;
#endif
}
typedef struct avg_var16 {
int32_t buf; // internal bufer to store non-rounded average value
int16_t res; // result (rounded to int)
} t_avg_var16;
/* n=(1..16) */
void average16(struct avg_var16 *avg, int16_t cur, int8_t n) {
avg->buf+= cur - avg->res;
avg->res = avg->buf >> n;
}
#define UPDATE_INTERVAL 25000 // 25000 = 40hz update rate (20hz LPF on acc)
#define UPDATE_INTERVAL2 250000 // 250000 = 4hz Rate f�r den Regler
#define INIT_DELAY 4000000 // 4 sec initialization delay
void getEstimatedAltitude(){
static uint32_t deadLine = INIT_DELAY,deadLine2 = INIT_DELAY;
static t_avg_var16 avgAlt = {0,0};
static int32_t DeltaAlt, DeltaAltOld; // Regelabweichung alt f�r PID-D
static int32_t velocity; // Geschwindigkeit H�hen�nderung
int16_t PidP = 0, PidI = 0, PidD;
if (currentTime < deadLine) return;
deadLine = currentTime + UPDATE_INTERVAL;
average16(&avgAlt, BaroAlt, 5); // / 4 = 16 = 0,375 sec 5 = 32 = 0,75 sec 6 = 64 = 1,5 sek // Mittelwert der H�he
EstAlt = avgAlt.res;
if (currentTime < deadLine2) return;
deadLine2 = currentTime + UPDATE_INTERVAL2;
// Dieser Teil der Routine wird nur 4 mal in der Sekunde ausgef�hrt
DeltaAltOld = DeltaAlt;
DeltaAlt = AltHold - EstAlt; // ist positiv bei zu niedrig
velocity = DeltaAlt - DeltaAltOld; // ist positiv bei sinken, negativ beim Steigen
//D
PidD = conf.D8[PIDALT] * (velocity) / 16; // ist positiv bei sinken // soll der schnellen Bewegung engegenwirken
BaroPID = PidD;
//P
PidP = conf.P8[PIDALT] * constrain(DeltaAlt,-100,100)/100;
BaroPID += PidP;
BaroPID = constrain(BaroPID,-150,+150);
//I
errorAltitudeI += DeltaAlt * conf.I8[PIDALT] / 16;
errorAltitudeI = constrain(errorAltitudeI,-3000,3000); // war 30000
PidI = errorAltitudeI / 75; // I in range +/-40
BaroPID += PidI;
}