ardupilot/libraries/AP_IMU/AP_IMU.h

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#ifndef AP_IMU_h
#define AP_IMU_h
#include <FastSerial.h>
#include <AP_Math.h>
#include <inttypes.h>
#include "WProgram.h"
#include <AP_ADC.h>
#include <avr/eeprom.h>
class AP_IMU
{
public:
// Constructors
AP_IMU(AP_ADC *adc, uint16_t address) :
_adc(adc),
_address(address)
{}
// Methods
void init(void); // inits both
void init_accel(void); // just Accels
void init_gyro(void); // just gyros
void zero_accel(void);
void load_gyro_eeprom(void);
void save_gyro_eeprom(void);
void load_accel_eeprom(void);
void save_accel_eeprom(void);
void print_accel_offsets(void);
void print_gyro_offsets(void);
void ax(const int v) { _adc_offset[3] = v; }
void ay(const int v) { _adc_offset[4] = v; }
void az(const int v) { _adc_offset[5] = v; }
// raw ADC values - called by DCM
Vector3f get_gyro(void); // Radians/second
Vector3f get_accel(void); // meters/seconds squared
// Members
uint8_t adc_constraints; // a check of how many times we get non-sensical values
private:
// Methods
void read_offsets(void);
float gyro_temp_comp(int i, int temp) const;
// members
uint16_t _address; // EEPROM start address for saving/retrieving offsets
float _adc_in[6]; // array that store the 6 ADC channels used by IMU
float _adc_offset[6]; // Array that store the Offset of the gyros and accelerometers
Vector3f _accel_vector; // Store the acceleration in a vector
Vector3f _gyro_vector; // Store the gyros turn rate in a vector
AP_ADC * _adc; // Analog to digital converter pointer
float read_EE_float(int address);
void write_EE_float(float value, int address);
// constants
static const uint8_t _sensors[6];
static const int _sensor_signs[9];
static const uint8_t _gyro_temp_ch = 3; // The ADC channel reading the gyro temperature
static const float _gyro_temp_curve[3][3];
};
#endif