ardupilot/libraries/AP_InertialSensor/AP_InertialSensor_MPU6000.h

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/// -*- tab-width: 4; Mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*-
#ifndef __AP_INERTIAL_SENSOR_MPU6000_H__
#define __AP_INERTIAL_SENSOR_MPU6000_H__
#include <string.h>
#include <stdint.h>
#include "../AP_PeriodicProcess/AP_PeriodicProcess.h"
#include "../AP_Math/AP_Math.h"
#include "AP_InertialSensor.h"
#define MPU6000_CS_PIN 53 // APM pin connected to mpu6000's chip select pin
#define DMP_FIFO_BUFFER_SIZE 72 // DMP FIFO buffer size
// DMP memory
extern const uint8_t dmpMem[8][16][16] PROGMEM;
class AP_InertialSensor_MPU6000 : public AP_InertialSensor
{
public:
AP_InertialSensor_MPU6000();
static void dmp_init(); // Initialise MPU6000's DMP
static void dmp_reset(); // Reset the DMP (required for changes in gains or offsets to take effect)
/* Concrete implementation of AP_InertialSensor functions: */
bool update();
bool new_data_available();
float gx();
float gy();
float gz();
float ax();
float ay();
float az();
float temperature();
float get_gyro_drift_rate();
// push_gyro_offsets_to_dmp - updates gyro offsets in mpu6000 registers
void push_gyro_offsets_to_dmp();
void set_dmp_gyro_offsets(int16_t offsetX, int16_t offsetY, int16_t offsetZ);
// push_accel_offsets_to_dmp - updates accel offsets in DMP registers
void push_accel_offsets_to_dmp();
void set_dmp_accel_offsets(int16_t offsetX, int16_t offsetY, int16_t offsetZ);
// num_samples_available - get number of samples read from the sensors
uint16_t num_samples_available();
// get_delta_time returns the time period in seconds overwhich the sensor data was collected
uint32_t get_delta_time_micros();
protected:
uint16_t _init_sensor( AP_PeriodicProcess * scheduler );
private:
static void read(uint32_t);
static void data_interrupt(void);
static uint8_t register_read( uint8_t reg );
static void register_write( uint8_t reg, uint8_t val );
static void hardware_init();
float _temp;
float _temp_to_celsius( uint16_t );
static const float _gyro_scale;
static const uint8_t _gyro_data_index[3];
static const int8_t _gyro_data_sign[3];
static const uint8_t _accel_data_index[3];
static const int8_t _accel_data_sign[3];
static const uint8_t _temp_data_index;
static AP_PeriodicProcess* _scheduler; // pointer to scheduler so that we can suspend/resume scheduler when we pull data from the MPU6000
// ensure we can't initialise twice
bool _initialised;
static int16_t _mpu6000_product_id;
// dmp related methods and parameters
static void dmp_register_write(uint8_t bank, uint8_t address, uint8_t num_bytes, uint8_t data[]); // Method to write multiple bytes into dmp registers. Requires a "bank"
static void dmp_set_rate(uint8_t rate); // set DMP output rate (see constants)
public:
static Quaternion quaternion; // holds the 4 quaternions representing attitude taken directly from the DMP
static bool FIFO_ready(); // returns true if new attitude data is available in FIFO buffer
static void FIFO_reset(); // clear attitude data from FIFO buffer
static void FIFO_getPacket(); // get latest attitude data from FIFO buffer
static void dmp_set_gyro_calibration();
static void dmp_set_accel_calibration();
static void dmp_apply_endian_accel();
static void dmp_set_mpu_sensors(); // To configure for SIX_AXIS output
static void dmp_set_bias_from_no_motion(); // Turn on bias from no motion
static void dmp_set_bias_none(); // Turn off internal bias correction (we will use this and we handle the gyro bias correction externally)
static void dmp_set_fifo_interrupt();
static void dmp_send_quaternion(); // Send quaternion data to FIFO
static void dmp_send_gyro(); // Send gyro data to FIFO
static void dmp_send_accel(); // Send accel data to FIFO
static void dmp_set_fifo_rate(uint8_t rate); // This functions defines the rate at wich attitude data is send to FIFO. Rate: 0 => SAMPLE_RATE(ex:200Hz), 1=> SAMPLE_RATE/2 (ex:100Hz), 2=> SAMPLE_RATE/3 (ex:66Hz)
static void dmp_set_sensor_fusion_accel_gain(uint8_t gain); // This function defines the weight of the accel on the sensor fusion. Default value is 0x80. The official invensense name is inv_key_0_96 (?)
static void dmp_load_mem(); // Load initial memory values into DMP memory banks
static uint8_t _received_packet[DMP_FIFO_BUFFER_SIZE]; // FIFO packet buffer
static uint8_t _fifoCountH; // high byte of number of elements in fifo buffer
static uint8_t _fifoCountL; // low byte of number of elements in fifo buffer
static bool _dmp_initialised;
};
#endif // __AP_INERTIAL_SENSOR_MPU6000_H__