imu_apogee.c

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/*
 * Copyright (C) 2013 Gautier Hattenberger
 *
 * This file is part of paparazzi.
 *
 * paparazzi is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * paparazzi is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with paparazzi; see the file COPYING.  If not, write to
 * the Free Software Foundation, 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */
 
#include <math.h>
#include "boards/apogee/imu_apogee.h"
#include "mcu_periph/i2c.h"
#include "led.h"
#include "modules/core/abi.h"
#include "generated/modules.h"
 
// Downlink
#include "mcu_periph/uart.h"
#include "pprzlink/messages.h"
#include "modules/datalink/downlink.h"
 
#ifndef IMU_APOGEE_CHAN_X
#define IMU_APOGEE_CHAN_X 0
#endif
#ifndef IMU_APOGEE_CHAN_Y
#define IMU_APOGEE_CHAN_Y 1
#endif
#ifndef IMU_APOGEE_CHAN_Z
#define IMU_APOGEE_CHAN_Z 2
#endif
 
#if !defined APOGEE_LOWPASS_FILTER && !defined  APOGEE_SMPLRT_DIV
#define APOGEE_LOWPASS_FILTER MPU60X0_DLPF_42HZ
#define APOGEE_SMPLRT_DIV 9
PRINT_CONFIG_MSG("Gyro/Accel output rate is 100Hz")
#endif
PRINT_CONFIG_VAR(APOGEE_SMPLRT_DIV)
PRINT_CONFIG_VAR(APOGEE_LOWPASS_FILTER)
 
PRINT_CONFIG_VAR(APOGEE_GYRO_RANGE)
PRINT_CONFIG_VAR(APOGEE_ACCEL_RANGE)
 
#if APOGEE_USE_MPU9150
#ifndef APOGEE_MAG_FREQ
#define APOGEE_MAG_FREQ 50
#endif
PRINT_CONFIG_VAR(APOGEE_MAG_FREQ)
#define MAG_PRESCALER Max(1,((PERIODIC_FREQUENCY)/APOGEE_MAG_FREQ))
PRINT_CONFIG_VAR(MAG_PRESCALER)
 
// mag config will be done later in bypass mode
bool configure_mag_slave(Mpu60x0ConfigSet mpu_set, void *mpu);
bool configure_mag_slave(Mpu60x0ConfigSet mpu_set __attribute__((unused)), void *mpu __attribute__((unused)))
{
  return true;
}
 
#endif
 
struct ImuApogee imu_apogee;
 
// baro config will be done later in bypass mode
bool configure_baro_slave(Mpu60x0ConfigSet mpu_set, void *mpu);
bool configure_baro_slave(Mpu60x0ConfigSet mpu_set __attribute__((unused)), void *mpu __attribute__((unused)))
{
  return true;
}
 
void imu_apogee_init(void)
{
  // MPU-60X0
  mpu60x0_i2c_init(&imu_apogee.mpu, &(IMU_APOGEE_I2C_DEV), MPU60X0_ADDR_ALT);
  // change the default configuration
  imu_apogee.mpu.config.smplrt_div = APOGEE_SMPLRT_DIV;
  imu_apogee.mpu.config.dlpf_cfg = APOGEE_LOWPASS_FILTER;
  imu_apogee.mpu.config.gyro_range = APOGEE_GYRO_RANGE;
  imu_apogee.mpu.config.accel_range = APOGEE_ACCEL_RANGE;
  // set MPU in bypass mode for the baro
  imu_apogee.mpu.config.nb_slaves = 1;
  imu_apogee.mpu.config.slaves[0].configure = &configure_baro_slave;
  imu_apogee.mpu.config.i2c_bypass = true;
  // set the default values
  imu_set_defaults_gyro(IMU_BOARD_ID, NULL, NULL, MPU60X0_GYRO_SENS_FRAC[APOGEE_GYRO_RANGE]);
  imu_set_defaults_accel(IMU_BOARD_ID, NULL, NULL, MPU60X0_ACCEL_SENS_FRAC[APOGEE_ACCEL_RANGE]);
  
#if APOGEE_USE_MPU9150
  // if using MPU9150, internal mag needs to be configured
  ak8975_init(&imu_apogee.ak, &(IMU_APOGEE_I2C_DEV), AK8975_I2C_SLV_ADDR);
  imu_apogee.mpu.config.nb_slaves = 2;
  imu_apogee.mpu.config.slaves[1].configure = &configure_mag_slave;
#endif
}
 
void imu_apogee_periodic(void)
{
  // Start reading the latest gyroscope data
  mpu60x0_i2c_periodic(&imu_apogee.mpu);
 
#if APOGEE_USE_MPU9150
  // Start reading internal mag if available
  RunOnceEvery(MAG_PRESCALER, ak8975_periodic(&imu_apogee.ak));
#endif
}
 
void imu_apogee_event(void)
{
  uint32_t now_ts = get_sys_time_usec();
 
  // If the itg3200 I2C transaction has succeeded: convert the data
  mpu60x0_i2c_event(&imu_apogee.mpu);
  if (imu_apogee.mpu.data_available) {
    struct Int32Rates rates = {
        (int32_t)( imu_apogee.mpu.data_rates.value[IMU_APOGEE_CHAN_X]),
        (int32_t)(-imu_apogee.mpu.data_rates.value[IMU_APOGEE_CHAN_Y]),
        (int32_t)(-imu_apogee.mpu.data_rates.value[IMU_APOGEE_CHAN_Z])
    };
    AbiSendMsgIMU_GYRO_RAW(IMU_BOARD_ID, now_ts, &rates, 1, IMU_APOGEE_PERIODIC_FREQ, imu_apogee.mpu.temp);
    struct Int32Vect3 accel = {
        (int32_t)( imu_apogee.mpu.data_accel.value[IMU_APOGEE_CHAN_X]),
        (int32_t)(-imu_apogee.mpu.data_accel.value[IMU_APOGEE_CHAN_Y]),
        (int32_t)(-imu_apogee.mpu.data_accel.value[IMU_APOGEE_CHAN_Z])
    };
    AbiSendMsgIMU_ACCEL_RAW(IMU_BOARD_ID, now_ts, &accel, 1, IMU_APOGEE_PERIODIC_FREQ, imu_apogee.mpu.temp);
    imu_apogee.mpu.data_available = false;
  }
 
#if APOGEE_USE_MPU9150
  ak8975_event(&imu_apogee.ak);
  if (imu_apogee.ak.data_available) {
    struct Int32Vect3 mag = {
        (int32_t)( imu_apogee.ak.data.value[IMU_APOGEE_CHAN_Y]),
        (int32_t)(-imu_apogee.ak.data.value[IMU_APOGEE_CHAN_X]),
        (int32_t)( imu_apogee.ak.data.value[IMU_APOGEE_CHAN_Z])
    };
    AbiSendMsgIMU_MAG_RAW(IMU_BOARD_ID, now_ts, &mag);
    imu_apogee.ak.data_available = false;    
  }
#endif
}