/// -*- tab-width: 4; Mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*-
/*
This program 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 3 of the License, or
(at your option) any later version.
This program 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 this program. If not, see .
-- Coded by Victor Mayoral Vilches --
The MPU9150 is a sensor composed by a MPU6050 with a AK8975 on the auxiliary bus.
Please check the following links for datasheets and documentation:
- http://www.invensense.com/mems/gyro/documents/PS-MPU-9150A-00v4_3.pdf
- http://www.invensense.com/mems/gyro/documents/RM-MPU-9150A-00v4_2.pdf
Note that this is an experimental driver. It is not used by any
actively maintained board and should be considered untested and
unmaintained
*/
#include
#if CONFIG_HAL_BOARD == HAL_BOARD_LINUX
#include
#include "AP_InertialSensor_MPU9150.h"
#include
#include
#include
const extern AP_HAL::HAL& hal;
///////
/* Hardware registers needed by driver. */
struct gyro_reg_s {
uint8_t who_am_i;
uint8_t rate_div;
uint8_t lpf;
uint8_t prod_id;
uint8_t user_ctrl;
uint8_t fifo_en;
uint8_t gyro_cfg;
uint8_t accel_cfg;
uint8_t motion_thr;
uint8_t motion_dur;
uint8_t fifo_count_h;
uint8_t fifo_r_w;
uint8_t raw_gyro;
uint8_t raw_accel;
uint8_t temp;
uint8_t int_enable;
uint8_t dmp_int_status;
uint8_t int_status;
uint8_t pwr_mgmt_1;
uint8_t pwr_mgmt_2;
uint8_t int_pin_cfg;
uint8_t mem_r_w;
uint8_t accel_offs;
uint8_t i2c_mst;
uint8_t bank_sel;
uint8_t mem_start_addr;
uint8_t prgm_start_h;
uint8_t raw_compass;
uint8_t yg_offs_tc;
uint8_t s0_addr;
uint8_t s0_reg;
uint8_t s0_ctrl;
uint8_t s1_addr;
uint8_t s1_reg;
uint8_t s1_ctrl;
uint8_t s4_ctrl;
uint8_t s0_do;
uint8_t s1_do;
uint8_t i2c_delay_ctrl;
};
/* Information specific to a particular device. */
struct hw_s {
uint8_t addr;
uint16_t max_fifo;
uint8_t num_reg;
uint16_t temp_sens;
int16_t temp_offset;
uint16_t bank_size;
uint16_t compass_fsr;
};
/* Information for self-test. */
struct test_s {
uint32_t gyro_sens;
uint32_t accel_sens;
uint8_t reg_rate_div;
uint8_t reg_lpf;
uint8_t reg_gyro_fsr;
uint8_t reg_accel_fsr;
uint16_t wait_ms;
uint8_t packet_thresh;
float min_dps;
float max_dps;
float max_gyro_var;
float min_g;
float max_g;
float max_accel_var;
};
/* Gyro driver state variables. */
struct gyro_state_s {
const struct gyro_reg_s *reg;
const struct hw_s *hw;
const struct test_s *test;
};
/* Filter configurations. The values correspond to the DLPF_CFG register.
Note that the gyro and accel frequencies are slightly different.
(DLPF_CFG register, RM-MPU-9150A00.pdf, pg. 13)
*/
enum lpf_e {
INV_FILTER_256HZ_NOLPF2 = 0,
INV_FILTER_188HZ = 1,
INV_FILTER_98HZ = 2,
INV_FILTER_42HZ = 3,
INV_FILTER_20HZ = 4,
INV_FILTER_10HZ = 5,
INV_FILTER_5HZ = 6,
INV_FILTER_2100HZ_NOLPF = 7,
NUM_FILTER
};
/* Full scale ranges. FS_SEL register.
(RM-MPU-9150A00.pdf, pg. 14)
*/
enum gyro_fsr_e {
INV_FSR_250DPS = 0,
INV_FSR_500DPS = 1,
INV_FSR_1000DPS = 2,
INV_FSR_2000DPS = 3,
NUM_GYRO_FSR
};
/* Full scale ranges. AFS_SEL register.
(RM-MPU-9150A00.pdf, pg. 15)
*/
enum accel_fsr_e {
INV_FSR_2G = 0,
INV_FSR_4G = 1,
INV_FSR_8G = 2,
INV_FSR_16G = 4,
NUM_ACCEL_FSR
};
/* Clock sources. */
enum clock_sel_e {
INV_CLK_INTERNAL = 0,
INV_CLK_PLL,
NUM_CLK
};
#define MPU9150_ADDRESS 0x68
#define INV_X_GYRO (0x40)
#define INV_Y_GYRO (0x20)
#define INV_Z_GYRO (0x10)
#define INV_XYZ_GYRO (INV_X_GYRO | INV_Y_GYRO | INV_Z_GYRO)
#define INV_XYZ_ACCEL (0x08)
#define INV_XYZ_COMPASS (0x01)
#define MPU_INT_STATUS_DATA_READY (0x0001)
#define MPU_INT_STATUS_DMP (0x0002)
#define MPU_INT_STATUS_PLL_READY (0x0004)
#define MPU_INT_STATUS_I2C_MST (0x0008)
#define MPU_INT_STATUS_FIFO_OVERFLOW (0x0010)
#define MPU_INT_STATUS_ZMOT (0x0020)
#define MPU_INT_STATUS_MOT (0x0040)
#define MPU_INT_STATUS_FREE_FALL (0x0080)
#define MPU_INT_STATUS_DMP_0 (0x0100)
#define MPU_INT_STATUS_DMP_1 (0x0200)
#define MPU_INT_STATUS_DMP_2 (0x0400)
#define MPU_INT_STATUS_DMP_3 (0x0800)
#define MPU_INT_STATUS_DMP_4 (0x1000)
#define MPU_INT_STATUS_DMP_5 (0x2000)
#define BIT_I2C_MST_VDDIO (0x80)
#define BIT_FIFO_EN (0x40)
#define BIT_DMP_EN (0x80)
#define BIT_FIFO_RST (0x04)
#define BIT_DMP_RST (0x08)
#define BIT_FIFO_OVERFLOW (0x10)
#define BIT_DATA_RDY_EN (0x01)
#define BIT_DMP_INT_EN (0x02)
#define BIT_MOT_INT_EN (0x40)
#define BITS_FSR (0x18)
#define BITS_LPF (0x07)
#define BITS_HPF (0x07)
#define BITS_CLK (0x07)
#define BIT_FIFO_SIZE_1024 (0x40)
#define BIT_FIFO_SIZE_2048 (0x80)
#define BIT_FIFO_SIZE_4096 (0xC0)
#define BIT_RESET (0x80)
#define BIT_SLEEP (0x40)
#define BIT_S0_DELAY_EN (0x01)
#define BIT_S2_DELAY_EN (0x04)
#define BITS_SLAVE_LENGTH (0x0F)
#define BIT_SLAVE_BYTE_SW (0x40)
#define BIT_SLAVE_GROUP (0x10)
#define BIT_SLAVE_EN (0x80)
#define BIT_I2C_READ (0x80)
#define BITS_I2C_MASTER_DLY (0x1F)
#define BIT_AUX_IF_EN (0x20)
#define BIT_ACTL (0x80)
#define BIT_LATCH_EN (0x20)
#define BIT_ANY_RD_CLR (0x10)
#define BIT_BYPASS_EN (0x02)
#define BITS_WOM_EN (0xC0)
#define BIT_LPA_CYCLE (0x20)
#define BIT_STBY_XA (0x20)
#define BIT_STBY_YA (0x10)
#define BIT_STBY_ZA (0x08)
#define BIT_STBY_XG (0x04)
#define BIT_STBY_YG (0x02)
#define BIT_STBY_ZG (0x01)
#define BIT_STBY_XYZA (BIT_STBY_XA | BIT_STBY_YA | BIT_STBY_ZA)
#define BIT_STBY_XYZG (BIT_STBY_XG | BIT_STBY_YG | BIT_STBY_ZG)
// AK8975_SECONDARY
#define SUPPORTS_AK89xx_HIGH_SENS (0x00)
#define AK89xx_FSR (9830)
#define MAX_COMPASS_SAMPLE_RATE (100)
// Gyroscope scale (uncertain where the 0.01745 value comes from)
#define MPU9150_GYRO_SCALE_2000 (0.0174532f / 16.4f)
#define MPU9150_GYRO_SCALE_1000 (0.0174532f / 32.8f)
#define MPU9150_GYRO_SCALE_500 (0.0174532f / 65.5f)
#define MPU9150_GYRO_SCALE_250 (0.0174532f / 131f)
// Accelerometer scale adjustment
#define MPU9150_ACCEL_SCALE_16G (GRAVITY_MSS / 2048.0f)
#define MPU9150_ACCEL_SCALE_8G (GRAVITY_MSS / 4096.0f)
#define MPU9150_ACCEL_SCALE_4G (GRAVITY_MSS / 8192.0f)
#define MPU9150_ACCEL_SCALE_2G (GRAVITY_MSS / 16384.0f)
const struct gyro_reg_s reg = {
/* .who_am_i */ 0x75,
/* .rate_div */ 0x19,
/* .lpf */ 0x1A,
/* .prod_id */ 0x0C,
/* .user_ctrl */ 0x6A,
/* .fifo_en */ 0x23,
/* .gyro_cfg */ 0x1B,
/* .accel_cfg */ 0x1C,
/* .motion_thr */ 0x1F,
/* .motion_dur */ 0x20,
/* .fifo_count_h */ 0x72,
/* .fifo_r_w */ 0x74,
/* .raw_gyro */ 0x43,
/* .raw_accel */ 0x3B,
/* .temp */ 0x41,
/* .int_enable */ 0x38,
/* .dmp_int_status*/ 0x39,
/* .int_status */ 0x3A,
/* .pwr_mgmt_1 */ 0x6B,
/* .pwr_mgmt_2 */ 0x6C,
/* .int_pin_cfg */ 0x37,
/* .mem_r_w */ 0x6F,
/* .accel_offs */ 0x06,
/* .i2c_mst */ 0x24,
/* .bank_sel */ 0x6D,
/* .mem_start_addr*/ 0x6E,
/* .prgm_start_h */ 0x70,
/* .raw_compass */ 0x49,
/* .yg_offs_tc */ 0x01,
/* .s0_addr */ 0x25,
/* .s0_reg */ 0x26,
/* .s0_ctrl */ 0x27,
/* .s1_addr */ 0x28,
/* .s1_reg */ 0x29,
/* .s1_ctrl */ 0x2A,
/* .s4_ctrl */ 0x34,
/* .s0_do */ 0x63,
/* .s1_do */ 0x64,
/* .i2c_delay_ctrl*/ 0x67
};
const struct hw_s hw = {
/* .addr */ 0x68,
/* .max_fifo */ 1024,
/* .num_reg */ 118,
/* .temp_sens */ 340,
/* .temp_offset */ -521,
/* .bank_size */ 256,
/* .compass_fsr */ AK89xx_FSR
};
const struct test_s test = {
/* .gyro_sens */ 32768/250,
/* .accel_sens */ 32768/16,
/* .reg_rate_div */ 0, /* 1kHz. */
/* .reg_lpf */ 1, /* 188Hz. */
/* .reg_gyro_fsr */ 0, /* 250dps. */
/* .reg_accel_fsr */ 0x18, /* 16g. */
/* .wait_ms */ 50,
/* .packet_thresh */ 5, /* 5% */
/* .min_dps */ 10.f,
/* .max_dps */ 105.f,
/* .max_gyro_var */ 0.14f,
/* .min_g */ 0.3f,
/* .max_g */ 0.95f,
/* .max_accel_var */ 0.14f
};
static struct gyro_state_s st = {
/* .reg */ ®,
/* .hw */ &hw,
/* .test */ &test
};
/**
* @brief Constructor
*/
AP_InertialSensor_MPU9150::AP_InertialSensor_MPU9150(AP_InertialSensor &imu) :
AP_InertialSensor_Backend(imu),
_have_sample_available(false),
_accel_filter(800, 10),
_gyro_filter(800, 10)
{
}
/*
detect the sensor
*/
AP_InertialSensor_Backend *AP_InertialSensor_MPU9150::detect(AP_InertialSensor &_imu)
{
AP_InertialSensor_MPU9150 *sensor = new AP_InertialSensor_MPU9150(_imu);
if (sensor == NULL) {
return NULL;
}
if (!sensor->_init_sensor()) {
delete sensor;
return NULL;
}
return sensor;
}
/*
set the accel filter frequency
*/
void AP_InertialSensor_MPU9150::_set_accel_filter_frequency(uint8_t filter_hz)
{
_accel_filter.set_cutoff_frequency(800, filter_hz);
}
/*
set the gyro filter frequency
*/
void AP_InertialSensor_MPU9150::_set_gyro_filter_frequency(uint8_t filter_hz)
{
_gyro_filter.set_cutoff_frequency(800, filter_hz);
}
/**
* Init method
*/
bool AP_InertialSensor_MPU9150::_init_sensor(void)
{
// Sensors pushed to the FIFO.
uint8_t sensors;
// get pointer to i2c bus semaphore
AP_HAL::Semaphore* i2c_sem = hal.i2c->get_semaphore();
// take i2c bus sempahore
if (!i2c_sem->take(HAL_SEMAPHORE_BLOCK_FOREVER)){
return false;
}
// Init the sensor
// Reset the device
hal.i2c->writeRegister(st.hw->addr,
st.reg->pwr_mgmt_1,
BIT_RESET);
hal.scheduler->delay(100);
// Wake up the chip
hal.i2c->writeRegister(st.hw->addr,
st.reg->pwr_mgmt_1,
0x00);
// Check product revision
// This registers are not documented in the register map.
uint8_t buff[6];
if (hal.i2c->readRegisters(st.hw->addr, st.reg->accel_offs, 6, buff) != 0) {
hal.console->printf("AP_InertialSensor_MPU9150: couldn't read the registers to determine revision");
goto failed;
}
// uint8_t rev;
// rev = ((buff[5] & 0x01) << 2) | ((buff[3] & 0x01) << 1) |
// (buff[1] & 0x01);
// Do not do the checking, for some reason the MPU-9150 returns 0
// if (rev) {
// if (rev == 1){
// /* Congrats, these parts are better. */
// ;
// }
// else if (rev == 2){
// ;
// }
// else {
// hal.scheduler->panic(PSTR("AP_InertialSensor_MPU9150: Unsupported software product rev.\n"));
// goto failed;
// }
// } else {
// hal.scheduler->panic(PSTR("Product ID read as 0 indicates device is either incompatible or an MPU3050.\n"));
// goto failed;
// }
// Set gyro full-scale range [250, 500, 1000, 2000]
if (mpu_set_gyro_fsr(2000)){
hal.console->printf("AP_InertialSensor_MPU9150: mpu_set_gyro_fsr.\n");
goto failed;
}
// Set the accel full-scale range
if (mpu_set_accel_fsr(2)){
hal.console->printf("AP_InertialSensor_MPU9150: mpu_set_accel_fsr.\n");
goto failed;
}
// Set digital low pass filter to 256Hz (DLPF disabled)
if (mpu_set_lpf(256)) {
hal.console->printf("AP_InertialSensor_MPU9150: mpu_set_lpf.\n");
goto failed;
}
// Set sampling rate (value must be between 4Hz and 1KHz)
if (mpu_set_sample_rate(800)){
hal.console->printf("AP_InertialSensor_MPU9150: mpu_set_sample_rate.\n");
goto failed;
}
// Select which sensors are pushed to FIFO.
sensors = INV_XYZ_ACCEL| INV_XYZ_GYRO;
if (mpu_configure_fifo(sensors)){
hal.console->printf("AP_InertialSensor_MPU9150: mpu_configure_fifo.\n");
goto failed;
}
// For now the compass is not used.
// TODO adjust the functions to the ArduPilot API
// setup_compass();
// if (mpu_set_compass_sample_rate(10, 400))
// return -1;
mpu_set_sensors(sensors);
// Set the filter frecuency
_set_accel_filter_frequency(_accel_filter_cutoff());
_set_gyro_filter_frequency(_gyro_filter_cutoff());
// give back i2c semaphore
i2c_sem->give();
_gyro_instance = _imu.register_gyro();
_accel_instance = _imu.register_accel();
// start the timer process to read samples
hal.scheduler->register_timer_process(FUNCTOR_BIND_MEMBER(&AP_InertialSensor_MPU9150::_accumulate, void));
return true;
failed:
// give back i2c semaphore
i2c_sem->give();
return false;
}
/**
* @brief Set the gyro full-scale range.
* @param[in] fsr Desired full-scale range.
* @return 0 if successful.
*/
int16_t AP_InertialSensor_MPU9150::mpu_set_gyro_fsr(uint16_t fsr)
{
uint8_t data;
switch (fsr) {
case 250:
data = INV_FSR_250DPS << 3;
break;
case 500:
data = INV_FSR_500DPS << 3;
break;
case 1000:
data = INV_FSR_1000DPS << 3;
break;
case 2000:
data = INV_FSR_2000DPS << 3;
break;
default:
return -1;
}
hal.i2c->writeRegister(st.hw->addr,
st.reg->gyro_cfg,
data);
return 0;
}
/**
* @brief Set the accel full-scale range.
* @param[in] fsr Desired full-scale range.
* @return 0 if successful.
*/
int16_t AP_InertialSensor_MPU9150::mpu_set_accel_fsr(uint8_t fsr)
{
uint8_t data;
switch (fsr) {
case 2:
data = INV_FSR_2G << 3;
break;
case 4:
data = INV_FSR_4G << 3;
break;
case 8:
data = INV_FSR_8G << 3;
break;
case 16:
data = INV_FSR_16G << 3;
break;
default:
return -1;
}
hal.i2c->writeRegister(st.hw->addr,
st.reg->accel_cfg,
data);
return 0;
}
/**
* @brief Set digital low pass filter.
* The following LPF settings are supported: 188, 98, 42, 20, 10, 5.
* @param[in] lpf Desired LPF setting.
* @return 0 if successful.
*/
int16_t AP_InertialSensor_MPU9150::mpu_set_lpf(uint16_t lpf)
{
uint8_t data;
if (lpf == 0) {
data = INV_FILTER_256HZ_NOLPF2;
} else if (lpf >= 256){
data = INV_FILTER_256HZ_NOLPF2;
} else if (lpf >= 188){
data = INV_FILTER_188HZ;
}
else if (lpf >= 98){
data = INV_FILTER_98HZ;
}
else if (lpf >= 42){
data = INV_FILTER_42HZ;
}
else if (lpf >= 20){
data = INV_FILTER_20HZ;
}
else if (lpf >= 10){
data = INV_FILTER_10HZ;
}
else {
data = INV_FILTER_5HZ;
}
hal.i2c->writeRegister(st.hw->addr,
st.reg->lpf,
data);
return 0;
}
/**
* @brief Set sampling rate.
* Sampling rate must be between 4Hz and 1kHz.
* @param[in] rate Desired sampling rate (Hz).
* @return 0 if successful.
*/
int16_t AP_InertialSensor_MPU9150::mpu_set_sample_rate(uint16_t rate)
{
uint8_t data;
// uint16_t sample_rate;
if (rate < 4){
rate = 4;
}
else if (rate > 1000){
rate = 1000;
}
data = 1000 / rate - 1;
hal.i2c->writeRegister(st.hw->addr,
st.reg->rate_div,
data);
// sample_rate = 1000 / (1 + data);
// mpu_set_compass_sample_rate(min(sample_rate, MAX_COMPASS_SAMPLE_RATE), rate);
return 0;
}
/**
* @brief Set compass sampling rate.
* The compass on the auxiliary I2C bus is read by the MPU hardware at a
* maximum of 100Hz. The actual rate can be set to a fraction of the gyro
* sampling rate.
*
* \n WARNING: The new rate may be different than what was requested. Call
* mpu_get_compass_sample_rate to check the actual setting.
* @param[in] rate Desired compass sampling rate (Hz).
* @return 0 if successful.
*/
int16_t AP_InertialSensor_MPU9150::mpu_set_compass_sample_rate(uint16_t rate, uint16_t chip_sample_rate)
{
uint8_t div;
if (!rate || rate > MAX_COMPASS_SAMPLE_RATE){
return -1;
}
div = chip_sample_rate / rate - 1;
hal.i2c->writeRegister(st.hw->addr,
st.reg->s4_ctrl,
div);
return 0;
}
/**
* @brief Select which sensors are pushed to FIFO.
* @e sensors can contain a combination of the following flags:
* \n INV_X_GYRO, INV_Y_GYRO, INV_Z_GYRO
* \n INV_XYZ_GYRO
* \n INV_XYZ_ACCEL
* @param[in] sensors Mask of sensors to push to FIFO.
* @return 0 if successful.
*/
int16_t AP_InertialSensor_MPU9150::mpu_configure_fifo(uint8_t sensors)
{
int16_t result = 0;
/* Compass data isn't going into the FIFO. Stop trying. */
sensors &= ~INV_XYZ_COMPASS;
// Enable or disable the interrupts
// set_int_enable(1);
set_int_enable(0);
if (sensors) {
if (mpu_reset_fifo(sensors)) {
return -1;
}
}
return result;
}
/**
* @brief Enable/disable data ready interrupt.
* If the DMP is on, the DMP interrupt is enabled. Otherwise, the data ready
* interrupt is used.
* @param[in] enable 1 to enable interrupt.
* @return 0 if successful.
*/
int16_t AP_InertialSensor_MPU9150::set_int_enable(uint8_t enable)
{
uint8_t tmp;
if (enable){
tmp = BIT_DATA_RDY_EN;
}
else {
tmp = 0x00;
}
hal.i2c->writeRegister(st.hw->addr,
st.reg->int_enable,
tmp);
return 0;
}
/**
* @brief Reset FIFO read/write pointers.
* @return 0 if successful.
*/
int16_t AP_InertialSensor_MPU9150::mpu_reset_fifo(uint8_t sensors)
{
uint8_t data;
data = 0;
hal.i2c->writeRegister(st.hw->addr,st.reg->int_enable, data);
hal.i2c->writeRegister(st.hw->addr,st.reg->fifo_en, data);
hal.i2c->writeRegister(st.hw->addr,st.reg->user_ctrl, data);
data = BIT_FIFO_RST;
hal.i2c->writeRegister(st.hw->addr,st.reg->user_ctrl, data);
data = BIT_FIFO_EN;
// data = BIT_FIFO_EN | BIT_AUX_IF_EN;
hal.i2c->writeRegister(st.hw->addr,st.reg->user_ctrl, data);
hal.scheduler->delay(50);
// interrupts for the DMP
// data = BIT_DATA_RDY_EN;
data = 0;
hal.i2c->writeRegister(st.hw->addr,st.reg->int_enable, data);
// enable FIFO
hal.i2c->writeRegister(st.hw->addr,st.reg->fifo_en, sensors);
return 0;
}
#if 0
/* This initialization is similar to the one in ak8975.c.
TODO: Use the ArduPilot APIs (write, read, ...), remove the st.chip_cfg cache vars
*/
static int AP_InertialSensor_MPU9150::setup_compass(void)
{
uint8_t data[4], akm_addr;
mpu_set_bypass(1);
/* Find compass. Possible addresses range from 0x0C to 0x0F. */
for (akm_addr = 0x0C; akm_addr <= 0x0F; akm_addr++) {
int result;
result = i2c_read(akm_addr, AKM_REG_WHOAMI, 1, data);
if (!result && (data[0] == AKM_WHOAMI))
break;
}
if (akm_addr > 0x0F) {
/* TODO: Handle this case in all compass-related functions. */
log_e("Compass not found.\n");
return -1;
}
st.chip_cfg.compass_addr = akm_addr;
data[0] = AKM_POWER_DOWN;
if (i2c_write(st.chip_cfg.compass_addr, AKM_REG_CNTL, 1, data))
return -1;
delay_ms(1);
data[0] = AKM_FUSE_ROM_ACCESS;
if (i2c_write(st.chip_cfg.compass_addr, AKM_REG_CNTL, 1, data))
return -1;
delay_ms(1);
/* Get sensitivity adjustment data from fuse ROM. */
if (i2c_read(st.chip_cfg.compass_addr, AKM_REG_ASAX, 3, data))
return -1;
st.chip_cfg.mag_sens_adj[0] = (long)data[0] + 128;
st.chip_cfg.mag_sens_adj[1] = (long)data[1] + 128;
st.chip_cfg.mag_sens_adj[2] = (long)data[2] + 128;
data[0] = AKM_POWER_DOWN;
if (i2c_write(st.chip_cfg.compass_addr, AKM_REG_CNTL, 1, data))
return -1;
delay_ms(1);
mpu_set_bypass(0);
/* Set up master mode, master clock, and ES bit. */
data[0] = 0x40;
if (i2c_write(st.hw->addr, st.reg->i2c_mst, 1, data))
return -1;
/* Slave 0 reads from AKM data registers. */
data[0] = BIT_I2C_READ | st.chip_cfg.compass_addr;
if (i2c_write(st.hw->addr, st.reg->s0_addr, 1, data))
return -1;
/* Compass reads start at this register. */
data[0] = AKM_REG_ST1;
if (i2c_write(st.hw->addr, st.reg->s0_reg, 1, data))
return -1;
/* Enable slave 0, 8-byte reads. */
data[0] = BIT_SLAVE_EN | 8;
if (i2c_write(st.hw->addr, st.reg->s0_ctrl, 1, data))
return -1;
/* Slave 1 changes AKM measurement mode. */
data[0] = st.chip_cfg.compass_addr;
if (i2c_write(st.hw->addr, st.reg->s1_addr, 1, data))
return -1;
/* AKM measurement mode register. */
data[0] = AKM_REG_CNTL;
if (i2c_write(st.hw->addr, st.reg->s1_reg, 1, data))
return -1;
/* Enable slave 1, 1-byte writes. */
data[0] = BIT_SLAVE_EN | 1;
if (i2c_write(st.hw->addr, st.reg->s1_ctrl, 1, data))
return -1;
/* Set slave 1 data. */
data[0] = AKM_SINGLE_MEASUREMENT;
if (i2c_write(st.hw->addr, st.reg->s1_do, 1, data))
return -1;
/* Trigger slave 0 and slave 1 actions at each sample. */
data[0] = 0x03;
if (i2c_write(st.hw->addr, st.reg->i2c_delay_ctrl, 1, data))
return -1;
/* For the MPU9150, the auxiliary I2C bus needs to be set to VDD. */
data[0] = BIT_I2C_MST_VDDIO;
if (i2c_write(st.hw->addr, st.reg->yg_offs_tc, 1, data))
return -1;
return 0;
}
#endif
/**
* @brief Turn specific sensors on/off.
* @e sensors can contain a combination of the following flags:
* \n INV_X_GYRO, INV_Y_GYRO, INV_Z_GYRO
* \n INV_XYZ_GYRO
* \n INV_XYZ_ACCEL
* \n INV_XYZ_COMPASS
* @param[in] sensors Mask of sensors to wake.
* @return 0 if successful.
*/
int16_t AP_InertialSensor_MPU9150::mpu_set_sensors(uint8_t sensors)
{
uint8_t data;
// uint8_t user_ctrl;
if (sensors & INV_XYZ_GYRO){
data = INV_CLK_PLL;
}
else if (sensors){
data = 0;
}
else {
data = BIT_SLEEP;
}
hal.i2c->writeRegister(st.hw->addr,st.reg->pwr_mgmt_1, data);
data = 0;
if (!(sensors & INV_X_GYRO)){
data |= BIT_STBY_XG;
}
if (!(sensors & INV_Y_GYRO)){
data |= BIT_STBY_YG;
}
if (!(sensors & INV_Z_GYRO)){
data |= BIT_STBY_ZG;
}
if (!(sensors & INV_XYZ_ACCEL)){
data |= BIT_STBY_XYZA;
}
hal.i2c->writeRegister(st.hw->addr,st.reg->pwr_mgmt_2, data);
#if 0
if (sensors && (sensors != INV_XYZ_ACCEL)){
/* Latched interrupts only used in LP accel mode. */
mpu_set_int_latched(0);
}
#endif
// // handle the compass, not implemented for now
// #ifdef AK89xx_SECONDARY
// #ifdef AK89xx_BYPASS
// if (sensors & INV_XYZ_COMPASS)
// mpu_set_bypass(1);
// else
// mpu_set_bypass(0);
// #else
// if (i2c_read(st.hw->addr, st.reg->user_ctrl, 1, &user_ctrl))
// return -1;
// /* Handle AKM power management. */
// if (sensors & INV_XYZ_COMPASS) {
// data = AKM_SINGLE_MEASUREMENT;
// user_ctrl |= BIT_AUX_IF_EN;
// } else {
// data = AKM_POWER_DOWN;
// user_ctrl &= ~BIT_AUX_IF_EN;
// }
// if (st.chip_cfg.dmp_on)
// user_ctrl |= BIT_DMP_EN;
// else
// user_ctrl &= ~BIT_DMP_EN;
// if (i2c_write(st.hw->addr, st.reg->s1_do, 1, &data))
// return -1;
// /* Enable/disable I2C master mode. */
// if (i2c_write(st.hw->addr, st.reg->user_ctrl, 1, &user_ctrl))
// return -1;
// #endif
hal.scheduler->delay(50);
return 0;
}
#if 0
/**
* TODO: Remove the st.chip_cfg cache variables
*
* @brief Enable latched interrupts.
* Any MPU register will clear the interrupt.
* @param[in] enable 1 to enable, 0 to disable.
* @return 0 if successful.
*/
int16_t AP_InertialSensor_MPU9150::mpu_set_int_latched(uint8_t enable)
{
uint8_t tmp;
if (st.chip_cfg.latched_int == enable){
return 0;
}
if (enable){
tmp = BIT_LATCH_EN | BIT_ANY_RD_CLR;
}
else {
tmp = 0;
}
if (st.chip_cfg.bypass_mode){
tmp |= BIT_BYPASS_EN;
}
if (st.chip_cfg.active_low_int){
tmp |= BIT_ACTL;
}
hal.i2c->writeRegister(st.hw->addr,st.reg->int_pin_cfg, tmp);
st.chip_cfg.latched_int = enable;
return 0;
}
#endif
/**
* @brief Get one packet from the FIFO.
* If @e sensors does not contain a particular sensor, disregard the data
* returned to that pointer.
* \n @e sensors can contain a combination of the following flags:
* \n INV_X_GYRO, INV_Y_GYRO, INV_Z_GYRO
* \n INV_XYZ_GYRO
* \n INV_XYZ_ACCEL
* \n If the FIFO has no new data, @e sensors will be zero.
* \n If the FIFO is disabled, @e sensors will be zero and this function will
* return a non-zero error code.
* @param[out] gyro Gyro data in hardware units.
* @param[out] accel Accel data in hardware units.
* @param[out] timestamp Timestamp in milliseconds.
* @param[out] sensors Mask of sensors read from FIFO.
* @param[out] more Number of remaining packets.
* @return 0 if successful.
*/
int16_t AP_InertialSensor_MPU9150::mpu_read_fifo(int16_t *gyro, int16_t *accel, uint32_t *timestamp,
uint8_t *sensors, uint8_t *more)
{
/* Assumes maximum packet size is gyro (6) + accel (6). */
uint8_t data[12];
uint8_t packet_size = 0;
uint16_t fifo_count, index = 0;
uint8_t sensors_aux = INV_XYZ_ACCEL| INV_XYZ_GYRO;
sensors[0] = 0;
// We assume we want gyro and accel values
packet_size = 12;
// fifo_count_h register contains the number of samples in the FIFO
hal.i2c->readRegisters(st.hw->addr, st.reg->fifo_count_h, 2, data);
fifo_count = (data[0] << 8) | data[1];
if (fifo_count < packet_size){
return 0;
}
// hal.console->printf_P(PTR("FIFO count: %hd\n", fifo_count));
if (fifo_count > (st.hw->max_fifo >> 1)) {
/* FIFO is 50% full, better check overflow bit. */
hal.i2c->readRegister(st.hw->addr, st.reg->int_status, data);
if (data[0] & BIT_FIFO_OVERFLOW) {
mpu_reset_fifo(sensors_aux);
return -2;
}
}
*timestamp = hal.scheduler->millis();
// read the data
hal.i2c->readRegisters(st.hw->addr, st.reg->fifo_r_w, packet_size, data);
more[0] = fifo_count / packet_size - 1;
sensors[0] = 0;
if (index != packet_size) {
accel[0] = (data[index+0] << 8) | data[index+1];
accel[1] = (data[index+2] << 8) | data[index+3];
accel[2] = (data[index+4] << 8) | data[index+5];
sensors[0] |= INV_XYZ_ACCEL;
index += 6;
}
if (index != packet_size) {
gyro[0] = (data[index+0] << 8) | data[index+1];
sensors[0] |= INV_X_GYRO;
index += 2;
}
if (index != packet_size) {
gyro[1] = (data[index+0] << 8) | data[index+1];
sensors[0] |= INV_Y_GYRO;
index += 2;
}
if (index != packet_size) {
gyro[2] = (data[index+0] << 8) | data[index+1];
sensors[0] |= INV_Z_GYRO;
index += 2;
}
return 0;
}
/**
* @brief Accumulate values from accels and gyros.
*
* This method is called periodically by the scheduler.
*/
void AP_InertialSensor_MPU9150::_accumulate(void)
{
// get pointer to i2c bus semaphore
AP_HAL::Semaphore* i2c_sem = hal.i2c->get_semaphore();
// take i2c bus sempahore
if (!i2c_sem->take_nonblocking()){
return;
}
// Read accelerometer FIFO to find out how many samples are available
/* Assumes maximum packet size is gyro (6) + accel (6). */
uint8_t data[12];
uint8_t packet_size = 12;
uint16_t fifo_count, index = 0;
int16_t accel_x, accel_y, accel_z, gyro_x, gyro_y, gyro_z;
// fifo_count_h register contains the number of samples in the FIFO
hal.i2c->readRegisters(st.hw->addr, st.reg->fifo_count_h, 2, data);
fifo_count = (data[0] << 8) | data[1];
if (fifo_count < packet_size){
// give back i2c semaphore
i2c_sem->give();
return;
}
// hal.console->printf_P(PTR("FIFO count: %hd\n", fifo_count));
if (fifo_count > (st.hw->max_fifo >> 1)) {
/* FIFO is 50% full, better check overflow bit. */
hal.i2c->readRegister(st.hw->addr, st.reg->int_status, data);
if (data[0] & BIT_FIFO_OVERFLOW) {
mpu_reset_fifo(INV_XYZ_ACCEL| INV_XYZ_GYRO);
i2c_sem->give();
return;
}
}
// read the samples
for (uint16_t i=0; i< fifo_count; i++) {
// read the data
// TODO check whether it's possible to read all the packages in a single call
hal.i2c->readRegisters(st.hw->addr, st.reg->fifo_r_w, packet_size, data);
// TODO, remove all the checking since it's being configured this way.
if (index != packet_size) {
accel_x = (int16_t) (data[index+0] << 8) | data[index+1];
accel_y = (int16_t) (data[index+2] << 8) | data[index+3];
accel_z = (int16_t) (data[index+4] << 8) | data[index+5];
index += 6;
}
if (index != packet_size) {
gyro_x = (int16_t) (data[index+0] << 8) | data[index+1];
index += 2;
}
if (index != packet_size) {
gyro_y = (int16_t) (data[index+0] << 8) | data[index+1];
index += 2;
}
if (index != packet_size) {
gyro_z = (int16_t) (data[index+0] << 8) | data[index+1];
index += 2;
}
// reset the index
index = 0;
// TODO Revisit why AP_InertialSensor_L3G4200D uses a minus sign in the y and z component. Maybe this
// is because the sensor is placed in the bottom side of the board?
_accel_filtered = _accel_filter.apply(Vector3f(accel_x, accel_y, accel_z));
_gyro_filtered = _gyro_filter.apply(Vector3f(gyro_x, gyro_y, gyro_z));
_have_sample_available = true;
}
// give back i2c semaphore
i2c_sem->give();
}
bool AP_InertialSensor_MPU9150::update(void)
{
Vector3f accel, gyro;
hal.scheduler->suspend_timer_procs();
accel = _accel_filtered;
gyro = _gyro_filtered;
_have_sample_available = false;
hal.scheduler->resume_timer_procs();
accel *= MPU9150_ACCEL_SCALE_2G;
_publish_accel(_accel_instance, accel);
gyro *= MPU9150_GYRO_SCALE_2000;
_publish_gyro(_gyro_instance, gyro);
if (_last_accel_filter_hz != _accel_filter_cutoff()) {
_set_accel_filter_frequency(_accel_filter_cutoff());
_last_accel_filter_hz = _accel_filter_cutoff();
}
if (_last_gyro_filter_hz != _gyro_filter_cutoff()) {
_set_gyro_filter_frequency(_gyro_filter_cutoff());
_last_gyro_filter_hz = _gyro_filter_cutoff();
}
return true;
}
#endif // CONFIG_HAL_BOARD