ardupilot/libraries/AP_InertialSensor/AP_InertialSensor_Stub.cpp

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

#include "AP_InertialSensor_Stub.h"
#include <AP_HAL.h>
const extern AP_HAL::HAL& hal;

AP_InertialSensor_Stub::AP_InertialSensor_Stub() : AP_InertialSensor() {
        Vector3f accels;
        accels.z = -GRAVITY_MSS;
        set_accel(accels);
}

uint16_t AP_InertialSensor_Stub::_init_sensor( Sample_rate sample_rate ) {
    switch (sample_rate) {
    case RATE_50HZ:
        _sample_period_ms = 20;
        break;
    case RATE_100HZ:
        _sample_period_ms = 10;
        break;
    case RATE_200HZ:
        _sample_period_ms = 5;
        break;
    }
    return AP_PRODUCT_ID_NONE;
}

/*================ AP_INERTIALSENSOR PUBLIC INTERFACE ==================== */

bool AP_InertialSensor_Stub::update( void ) {
    uint32_t now = hal.scheduler->millis();
    _delta_time_usec = (now - _last_update_ms) * 1000;
    _last_update_ms = now;
    return true;
}

float AP_InertialSensor_Stub::get_delta_time() {
    return _delta_time_usec * 1.0e-6;
}
uint32_t AP_InertialSensor_Stub::get_last_sample_time_micros() {
    return _last_update_ms * 1000;
}
float AP_InertialSensor_Stub::get_gyro_drift_rate(void) {
    // 0.5 degrees/second/minute
    return ToRad(0.5/60);
}

bool AP_InertialSensor_Stub::sample_available()
{
    uint16_t ret = (hal.scheduler->millis() - _last_update_ms) 
        / _sample_period_ms;
    
    return ret > 0;
}