/// -*- tab-width: 4; Mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*-

#include <AP_HAL.h>
#include "AP_InertialSensor.h"
#include "AP_InertialSensor_Backend.h"

AP_InertialSensor_Backend::AP_InertialSensor_Backend(AP_InertialSensor &imu) :
    _imu(imu),
    _product_id(AP_PRODUCT_ID_NONE)
{}

/*
  rotate gyro vector and add the gyro offset
 */
void AP_InertialSensor_Backend::_rotate_and_offset_gyro(uint8_t instance, const Vector3f &gyro)
{
    _imu._gyro[instance] = gyro;
    _imu._gyro[instance].rotate(_imu._board_orientation);
    _imu._gyro[instance] -= _imu._gyro_offset[instance];
    _imu._gyro_healthy[instance] = true;
}

/*
  rotate accel vector, scale and add the accel offset
 */
void AP_InertialSensor_Backend::_rotate_and_offset_accel(uint8_t instance, const Vector3f &accel)
{
    _imu._accel[instance] = accel;
    _imu._accel[instance].rotate(_imu._board_orientation);

    const Vector3f &accel_scale = _imu._accel_scale[instance].get();
    _imu._accel[instance].x *= accel_scale.x;
    _imu._accel[instance].y *= accel_scale.y;
    _imu._accel[instance].z *= accel_scale.z;
    _imu._accel[instance] -= _imu._accel_offset[instance];
    _imu._accel_healthy[instance] = true;
}

/*
  return the default filter frequency in Hz for the sample rate
  
  This uses the sample_rate as a proxy for what type of vehicle it is
  (ie. plane and rover run at 50Hz). Copters need a bit more filter
  bandwidth
 */
uint8_t AP_InertialSensor_Backend::_default_filter(void) const
{
    switch (_imu.get_sample_rate()) {
    case AP_InertialSensor::RATE_50HZ:
        // on Rover and plane use a lower filter rate
        return 15;
    case AP_InertialSensor::RATE_100HZ:
        return 30;
    case AP_InertialSensor::RATE_200HZ:
        return 30;
    case AP_InertialSensor::RATE_400HZ:
        return 30;
    }
    return 30;
}