M5Stack/examples/Modules/BALA/imuCalibration.cpp

/*
 * @Author: Sorzn
 * @Date: 2020-01-06 11:00:49
 * @LastEditTime : 2020-01-06 15:15:40
 * @Description: M5Stack project
 * @FilePath:
 * /home/sakabin/Arduino/libraries/M5Stack/examples/Modules/Bala/imuAuto.cpp
 */

#include "imuCalibration.h"

static float gyroXOffset = 0;
static float gyroYOffset = 0;
static float gyroZOffset = 0;

static float accX = 0;
static float accY = 0;
static float accZ = 0;

static float gyroX = 0;
static float gyroY = 0;
static float gyroZ = 0;

static float angleAccX  = 0;
static float angleGyroX = 0;
static float angleX     = 0;

static uint32_t preInterval = 0;

void imu_CalcInit() {
    M5.IMU.Init();
    M5.IMU.setGyroFsr(M5.IMU.GFS_1000DPS);
}

void imu_setOffsetX(float x) {
    gyroXOffset = x;
}

float imu_getOffsetX() {
    return gyroXOffset;
}

void imu_calcGyroOffsets() {
    float x = 0, y = 0, z = 0;
    float x_total = 0, y_total = 0, z_total = 0;

    for (int i = 0; i < 3000; i++) {
        M5.IMU.getGyroData(&x, &y, &z);
        x_total += x;
    }

    gyroXOffset = x_total / 3000;
}

void imu_update() {
    float interval;
    if (preInterval == 0) preInterval = millis();

    M5.IMU.getGyroData(&gyroX, &gyroY, &gyroZ);
    M5.IMU.getAccelData(&accX, &accY, &accZ);

    angleAccX = atan2(accY, sqrt(accZ * accZ + accX * accX)) * 360 / 2.0 / PI;

    gyroX -= gyroXOffset;

    interval = (millis() - preInterval) * 0.001;

    preInterval = millis();

    angleX = (0.98 * (angleX + gyroX * interval)) + (0.02 * angleAccX);
}

float imu_getAngleX() {
#ifdef M5STACK_MPU6886 || M5STACK_200Q:
    return 0 - angleX;
#else:
    return angleX;
#endif
}