![](/media/cache/group/11700697_10200701668420946_8214886085951071495_o.jpg.50x50_q85.jpg)
Class of MPU9250
Dependencies: AHRS_fillter mbed
Fork of MPU9250AHRS by
Diff: AHRS.h
- Revision:
- 9:a9b0f8540cc6
- Parent:
- 8:928673148b55
diff -r 928673148b55 -r a9b0f8540cc6 AHRS.h --- a/AHRS.h Wed Jan 20 02:42:22 2016 +0000 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000 @@ -1,117 +0,0 @@ -#ifndef _AHRS_ -#define _AHRS_ - -#include "MPU9250.h" - -// Implementation of Sebastian Madgwick's "...efficient orientation filter for... inertial/magnetic sensor arrays" -// (see http://www.x-io.co.uk/category/open-source/ for examples and more details) -// which fuses acceleration, rotation rate, and magnetic moments to produce a quaternion-based estimate of absolute -// device orientation -- which can be converted to yaw, pitch, and roll. Useful for stabilizing quadcopters, etc. -// The performance of the orientation filter is at least as good as conventional Kalman-based filtering algorithms -// but is much less computationally intensive---it can be performed on a 3.3 V Pro Mini operating at 8 MHz! - -class AHRS:public MPU9250 -{ -private: - float roll, pitch, yaw; - float q[4]; // vector to hold quaternion - float eInt[3]; // vector to hold integral error for Mahony method - - // parameters for 6 DoF sensor fusion calculations - float PI; - float GyroMeasError; // gyroscope measurement error in rads/s (start at 60 deg/s), then reduce after ~10 s to 3 - float GyroMeasDrift; // gyroscope measurement drift in rad/s/s (start at 0.0 deg/s/s) - float beta; // compute beta - float zeta; // compute zeta, the other free parameter in the Madgwick scheme usually set to a small or zero value - - float norm; - float hx, hy, bx, bz; - float vx, vy, vz, wx, wy, wz; - float ex, ey, ez; - float pa, pb, pc; - - float q1, q2, q3, q4; - - // Auxiliary variables to avoid repeated arithmetic - float q1q1; - float q1q2; - float q1q3; - float q1q4; - float q2q2; - float q2q3; - float q2q4; - float q3q3; - float q3q4; - float q4q4; - - float Xh; - float Yh; - float yawmag; - - float deltat; - float delt_t; - float Now; - float sum; - float firstUpdate; - float lastUpdate; - uint32_t sumCount; - int count; - //int16_t tempCount; - - -public: - //MPU9250 imu; - //Serial test; - Timer t; - Serial pc2; - AHRS(PinName sda, PinName scl, PinName tx, PinName rx, int address) : MPU9250(sda,scl,tx,rx,address),pc2(tx,rx) { - for(int i=0; i<=3; i++) { - eInt[i] = 0; - q[i] = 0; // vector to hold quaternion - } - - q[0] = 1.0f; - - PI = 3.14159265358979323846f; - GyroMeasError = PI * (60.0f / 180.0f); // gyroscope measurement error in rads/s (start at 60 deg/s), then reduce after ~10 s to 3 - beta = sqrt(3.0f / 4.0f) * GyroMeasError; // compute beta - GyroMeasDrift = PI * (1.0f / 180.0f); // gyroscope measurement drift in rad/s/s (start at 0.0 deg/s/s) - zeta = sqrt(3.0f / 4.0f) * GyroMeasDrift; // compute zeta, the other free parameter in the Madgwick scheme usually set to a small or zero value - - //Time - sum = 0; - sumCount = 0; - count = 0; - - delt_t = 0; - lastUpdate = 0; - firstUpdate = 0; - Now = 0; - }; - //void MadgwickQuaternionUpdate(float , float , float , float , float , float , float , float , float , float); - //void MahonyQuaternionUpdate(float , float , float , float , float , float , float , float , float , float); - - void MadgwickQuaternionUpdate(); - void MahonyQuaternionUpdate(); - - float getRoll() { - return roll; - } - float getPitch() { - return pitch; - } - float getYaw() { - return yaw; - } - void PrintRollPitchYaw(); - - void TimeStart(); - void TimeRead() { - t.read_us(); - }; - void TimeCal(); - - void Run(); - -}; -#endif \ No newline at end of file